Tamer ABOUELNAGA was born in 1976. He received the B.Sc. degree in Electronics Engineering from Menofia University, Egypt in May 1999 and M.Sc. degree in Electrical and Communication Engineering from Ain Shams University, Cairo, Egypt, in the period from October 2002 to July 2007. He received his Ph.D. in 2012 from Ain Shams University. His master’s thesis was about the design ofdielectric resonator antenna for the S-band application and the Ph.D. thesis was about the RFID antennas designand analysis. From 2001 to 2007, he was Researcher Assistant, from 2007 to 2012, he was an AssistantResearcher and from 2012 till now he is a Researcher in the Microstrip Department, Electronics ResearchInstitute, Cairo. Also he worked as an Assistant Professor in the Higher Institute of Engineering andTechnology, Kafr El-Shiekh in the period from 2015 to 2016 and as Assistant Professor in the AmericanUniversity in Cairo in the period of 2012 to 2015. He has published 10 paper in peer-refereed journals and 8papers in international conferences in the area of the microstrip circuits’ components, RFID and DRA antennadesign. His research interests include antennas, microstrip circuit components and RFID system components.His current research interest on the biomedical area especially on the microwave breast cancer detection andhealing
The Applied Computational Electromagnetics Society Journal (ACES)
This paper introduces a localized masked thermal therapy method for only the breast through the F... more This paper introduces a localized masked thermal therapy method for only the breast through the Fresnel region. A pyramidal horn antenna has been used as a hyperthermia system applicator. The antenna is fed by a Yagi array and resonates at 4.74 GHz. A metal plate with a square slot masked the breast phantom. The antenna irradiates the breast phantom for 5 and 10 minutes with input power of 10 and 20 watts (W). Thermal and specific absorption rate (SAR) distributions are studied under the same conditions for a fair comparison between masked and unmasked system performance. The square slot dimensions are altered, and their effects are studied considering the phantom heated area. Moving from unmasked to masked hyperthermia scenarios, a heated area size reduction of 99.87 % is achieved along with a very considerable SAR value reduction. The masked scenario elevates the breast temperature to 43 C∘ in a very concentrated area. The proposed system can elevate only an area of 2×2mm2 of the ...
The objective of this paper is to develop a wearable circular UWB MIMO antenna array, consisting ... more The objective of this paper is to develop a wearable circular UWB MIMO antenna array, consisting of four elements, that is capable of detecting and locating tumor cells within a heterogeneous breast phantom. The antenna element operates within a bandwidth from 2.4 GHz to 10.6 GHz when FR4 is used as the substrate, and extends from 2.57 GHz to 12.6 GHz when a Dacron fabric is used instead. The antenna is fabricated and measured, yielding highly similar results to the simulated outcomes. In the suggested detection system, one antenna is used for transmission, while the other antennas receive the transmitted signal. The employed antenna demonstrates gains of 5.49 dBi, 9.87 dBi, 11.9 dBi, and 14.7 dBi at resonant frequencies of 2.84 GHz, 3.87 GHz, 5.83 GHz, and 8.24 GHz, respectively, when a Dacron fabric is used as the substrate. Moreover, the proposed antenna exhibits a flexible shape with minimal vertical and horizontal bending effects across the entire operating frequency band. The ...
The Applied Computational Electromagnetics Society Journal (ACES)
In this article, the design and the development of ultra-wideband UWB branch-line couplers BLCs w... more In this article, the design and the development of ultra-wideband UWB branch-line couplers BLCs with a novel method to control the coupling imbalance are proposed. The proposed UWB BLC is suitable for the 5G low-noise amplifier (LNA) design. UWB 4-branch BLC is designed using design curves developed using even and odd mode analyses to cover the 5G (3.3-5 GHz) frequency bands. The vertical branches of the UWB BLC are replaced by modified ones, and their effect on the coupling imbalance is investigated. The proposed BLC occupies an area of 33.9 × 15.7 mm2 Both conventional and modified BLC are fabricated, and their measured S-parameters are compared with analytical and simulated models. Based on the balanced amplifier topology, a 5G UWB low-noise amplifier is designed. The proposed BLCs and the MGF3022AM InGaP-HBT (Heterojunction Bipolar Transistor) are used to produce acceptable UWB performance. The balanced amplifier return loss, noise figure, and gain are investigated as BLCs coupl...
The Applied Computational Electromagnetics Society Journal (ACES)
In this article, the passband, and stopband of quarter wavelength stubs-based Band Pass Filter (B... more In this article, the passband, and stopband of quarter wavelength stubs-based Band Pass Filter (BPF) are controlled by a straightforward and new method. This method depends on inserting an attenuation pole and tuning the passband by a Circular Slot Ring Resonator (CSRR) and rectangular slot beneath the BPF’s stubs. Hence, controlling the passband width without any further area usage is achieved. The stop-band rejection level and bandwidth are controlled by inserting Band Stop Filter (BSF) after the BPF such that the used rectangular slots beneath the stubs control the stop-band bandwidth. For verification, third-order Chebyshev BPF and Butterworth BSF filters are used. The proposed filter passband is chosen to cover the sub-6 GHz different 5G bands. The proposed BPF has an ultra-wide 3 dB passband of 2.97 GHz (2.35 GHz-5.32 GHz) and a 20 dB stopband of 4.59 GHz (6.18-10.77 GHz). The proposed BPF filter is fabricated, measured, and the results are in good agreement with their simulat...
The Applied Computational Electromagnetics Society Journal (ACES)
In this paper, a triple-band ultra-wideband UWB eight elements monopole antenna array is proposed... more In this paper, a triple-band ultra-wideband UWB eight elements monopole antenna array is proposed. This antenna array is designed with the minimum printed area and is prepared for wireless local area network (WLANs) power harvesting applications. It covers the bands of 2.4 GHz and 5 GHz, which makes it suitable for Wi-Fi frequencies to harvest their power. The eight-element antenna array dimensions are 28.5 cm by 15 cm. These dimensions are chosen for the mini-solar cell integration process. Low-cost FR4 material is used as a substrate. The proposed antenna’s measured reflection coefficient is compared with its simulated counterpart and is founded in good harmony.
This paper proposes a wideband ultra-compact implantable antenna for a wireless body area network... more This paper proposes a wideband ultra-compact implantable antenna for a wireless body area network (WBAN). The proposed patch antenna works in the industrial, scientific, and medical (ISM) bands. The proposed patch antenna with an ultra-compact size (5 × 5 × 0.26 mm3) was designed with 29% wide bandwidth (about 670 MHz). This wide bandwidth makes the antenna unaffected by implantation in different human body parts. The miniaturization process passed many steps by adding many slots with different shapes in the radiating element as well as in the ground plane. A 50 Ω coaxial feeding excites the antenna to maintain matching and low power loss. The specific absorption rate (SAR) was calculated for health considerations. The result was within the standard limits of IEEE organizations and the International Commission on Non-Ionizing Radiation Protection (ICNRP). The antenna was tested in tissues with multiple layers (up to seven layers) and at various depths (up to 29 mm). The link margin ...
A typical 5G multiple-input and multiple-output (MIMO) system must combine a high number of anten... more A typical 5G multiple-input and multiple-output (MIMO) system must combine a high number of antennas at both the transmitter and receiver to realize spatial multiplexing capability. In this paper, a wideband 16- element indoor base station (BS) antenna array that can cover 3.3–6.0 GHz is proposed for 5G applications. A π-shaped monopole antenna is designed to cover the Lower band (LTE bands 42/43–N77–N78), the intermediate band (N79), and the higher band (LTE 46). The antenna elements are arranged in a limited space printed on a substrate take the Hexakaidecagon Polygon shape. As the antenna elements are arranged with good isolation, achieving good polarization diversity. The proposed BS array is simulated, fabricated, and tested. The typical results, S-parameters, antenna efficiency, and radiation patterns are investigated. Moreover, to validate the MIMO performances, a very low envelope correlation coefficient (ECC) below 0.02, high antenna efficiency of about 82–93.2% are achieve...
2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), 2018
Microwave breast cancer detection has become an attractive method for cancer early detection proc... more Microwave breast cancer detection has become an attractive method for cancer early detection process. These systems uses directional and efficient antenna for transmitting and receiving signals. This paper is focused on the implementation of ultra-wideband, high gain, and directional microstrip antenna array for breast cancer detection system. Metamaterial cells are used for antenna gain enhancement purpose. Permeability and permittivity of metamaterial unit cell are obtained all over the operating bandwidth. Based on the metamaterial cell performance its geometry is altered to enhance the antenna gain at specific frequency band. Ultra wide band (UWB) unequal power divider is used to feed the proposed four elements antenna array based on Chebyshev excitation method. The proposed antenna has reasonable 3 dB beamwidth (3dBBW) and gain of 17.7 degrees and 14.5 dB at 4.12 GHz, respectively. The operating bandwidth (BW) which extends from 5.6 GHz to 10.9 GHz. The proposed antenna is fabricated, measured, and good agreement is obtained between simulated and measured results. Simulated specific absorption rate SAR is obtained and investigated for breast phantom where a small tumor is placed. The SAR results show clearly the tumor location in breast tissues which ensures the suitability of the proposed antenna array for cancer detection system.
2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), 2018
This paper introduces the detailed design and experimental demonstration of a narrow beamwidth an... more This paper introduces the detailed design and experimental demonstration of a narrow beamwidth and low side lobe level pyramidal horn antenna based on placing a ten directors Yagi array as an exciter instead of simple monopole antenna. Teflon rectangular parallelepiped is used as a dielectric material where Yagi array is placed for horn feeding purpose. Directors' length, position, separation, and their number are chosen carefully to obtain a high gain, suitable 3 dB beamwidth, and suitable side lobe level as compared to conventional one. The proposed pyramidal horn antenna achieves a simulated gain, 3 dB beamwidth, and side lobe level of 13.8 dBi, 37.4 degrees, and -26.3 dB at 4.86 GHz, respectively. The proposed antenna is mainly designed for breast cancer hyperthermia therapy where narrow beamwidth, low side lobe level, and high gain are essentially requisites. For verification purpose, the proposed antenna irradiate a breast phantom for 10 minutes and with 2 watt at its input port. The breast phantom temperature is elevated 4 degrees above normal temperature. These results candidates the proposed antenna for breast cancer hyperthermia treatment.
International Journal of Microwave and Wireless Technologies, 2022
In this paper, an ultra-compact implantable antenna for biomedical applications is proposed. The ... more In this paper, an ultra-compact implantable antenna for biomedical applications is proposed. The proposed implanted meandered compact patch antenna is implanted inside the body at a depth of 2 mm. The proposed antenna was designed with Roger RO3003 (ɛr = 3) as substrate with an overall size of dimensions 5 × 5 × 0.26 mm3. The radiating element is a square patch antenna with different size rectangular slots and coaxial feeding. The proposed implantable antenna resonates at 2.45 GHz (from 2.26 to 2.72 GHz) frequency with a bandwidth of 460 MHz and a gain of −22.6 dB. The specific absorption rate has been considered for health care considerations, and the result is within the limits of the federal communication commission. The measured and simulated scattering parameters are compared, and good agreements are achieved. The proposed antenna is simulated and investigated for biomedical applications suitability.
journal of engineering science and technology, 2017
In this paper, a proposed defected concrete post detection system is introduced. The proposed sys... more In this paper, a proposed defected concrete post detection system is introduced. The proposed system consists of two compact microstrip broad side antenna arrays resonating at 1 GHz with dimensions of 45 cm by 13.2 cm for each antenna array and a weight of 800 gm for both antenna arrays. Also a portable vector network analyser is used for scattering parameters measurement purpose. For size comparison purpose, a conventional microstrip antenna array is designed and compared with the proposed one at the same resonant frequency. A size reduction of 23.4 % is obtained. The proposed antenna array directivity of 10.5 dBi and 3 dB beam width of 30.7 are obtained which are suitable for the concrete post defect detection. The detection principle is relied on the coupling between the two antenna array elements. Three cases are considered for simulation and measurement, air, good concrete block and defected concrete block. A 10 dB difference in coupling was obtained between the presence and th...
This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) ar... more This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) array design for radar and microwave imaging applications. Initially, the radiation ares of the AVA is designed based on an elliptical curve shape. Next, the substrate end is shaped as a triangular shape and a negative index metamaterial (NIM) has been incorporated into the AVA aperture to act as a director. A gain enhancement of 2 dB is obtained for the proposed element compared to conventional one. The proposed antenna element is fabricated and measured. There is a good consistency between the simulated and measured return loss. In addition, four UWB Vivaldi antennas with substrate end shaping are placed along the z-axis in a linear antenna array configuration. The four NIM structures of the four antennas are placed together to form a sheet which is perpendicular to the four antenna substrates. A gain enhancement of about 6 dBi is obtained compared to the proposed single element through ...
─ This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. ... more ─ This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. The proposed antenna covers different bandwidths through only changing the cone geometry. Same ground plane shape and feeding system are used. Firstly, both conventional and proposed monocone antennas are designed, simulated and their simulated results are compared. One antenna cone is fabricated and measured for verification purpose. Good agreement is obtained between measured and simulated bandwidths. The measured bandwidth extends from 73 MHz to 500 MHz. Secondly, another antenna cone is designed and simulated without altering the upper or the lower cone radii. The second cone antenna bandwidth extends from 130 MHz to 1000 MHz. The receiver antenna of the commercial SIR 2000 impulse GPR is replaced by the proposed VHF-UHF first monocone antenna and the field test results are recorded and discussed. Index Terms ─ GPR, MCA.
The Applied Computational Electromagnetics Society Journal (ACES)
This paper introduces a localized masked thermal therapy method for only the breast through the F... more This paper introduces a localized masked thermal therapy method for only the breast through the Fresnel region. A pyramidal horn antenna has been used as a hyperthermia system applicator. The antenna is fed by a Yagi array and resonates at 4.74 GHz. A metal plate with a square slot masked the breast phantom. The antenna irradiates the breast phantom for 5 and 10 minutes with input power of 10 and 20 watts (W). Thermal and specific absorption rate (SAR) distributions are studied under the same conditions for a fair comparison between masked and unmasked system performance. The square slot dimensions are altered, and their effects are studied considering the phantom heated area. Moving from unmasked to masked hyperthermia scenarios, a heated area size reduction of 99.87 % is achieved along with a very considerable SAR value reduction. The masked scenario elevates the breast temperature to 43 C∘ in a very concentrated area. The proposed system can elevate only an area of 2×2mm2 of the ...
The objective of this paper is to develop a wearable circular UWB MIMO antenna array, consisting ... more The objective of this paper is to develop a wearable circular UWB MIMO antenna array, consisting of four elements, that is capable of detecting and locating tumor cells within a heterogeneous breast phantom. The antenna element operates within a bandwidth from 2.4 GHz to 10.6 GHz when FR4 is used as the substrate, and extends from 2.57 GHz to 12.6 GHz when a Dacron fabric is used instead. The antenna is fabricated and measured, yielding highly similar results to the simulated outcomes. In the suggested detection system, one antenna is used for transmission, while the other antennas receive the transmitted signal. The employed antenna demonstrates gains of 5.49 dBi, 9.87 dBi, 11.9 dBi, and 14.7 dBi at resonant frequencies of 2.84 GHz, 3.87 GHz, 5.83 GHz, and 8.24 GHz, respectively, when a Dacron fabric is used as the substrate. Moreover, the proposed antenna exhibits a flexible shape with minimal vertical and horizontal bending effects across the entire operating frequency band. The ...
The Applied Computational Electromagnetics Society Journal (ACES)
In this article, the design and the development of ultra-wideband UWB branch-line couplers BLCs w... more In this article, the design and the development of ultra-wideband UWB branch-line couplers BLCs with a novel method to control the coupling imbalance are proposed. The proposed UWB BLC is suitable for the 5G low-noise amplifier (LNA) design. UWB 4-branch BLC is designed using design curves developed using even and odd mode analyses to cover the 5G (3.3-5 GHz) frequency bands. The vertical branches of the UWB BLC are replaced by modified ones, and their effect on the coupling imbalance is investigated. The proposed BLC occupies an area of 33.9 × 15.7 mm2 Both conventional and modified BLC are fabricated, and their measured S-parameters are compared with analytical and simulated models. Based on the balanced amplifier topology, a 5G UWB low-noise amplifier is designed. The proposed BLCs and the MGF3022AM InGaP-HBT (Heterojunction Bipolar Transistor) are used to produce acceptable UWB performance. The balanced amplifier return loss, noise figure, and gain are investigated as BLCs coupl...
The Applied Computational Electromagnetics Society Journal (ACES)
In this article, the passband, and stopband of quarter wavelength stubs-based Band Pass Filter (B... more In this article, the passband, and stopband of quarter wavelength stubs-based Band Pass Filter (BPF) are controlled by a straightforward and new method. This method depends on inserting an attenuation pole and tuning the passband by a Circular Slot Ring Resonator (CSRR) and rectangular slot beneath the BPF’s stubs. Hence, controlling the passband width without any further area usage is achieved. The stop-band rejection level and bandwidth are controlled by inserting Band Stop Filter (BSF) after the BPF such that the used rectangular slots beneath the stubs control the stop-band bandwidth. For verification, third-order Chebyshev BPF and Butterworth BSF filters are used. The proposed filter passband is chosen to cover the sub-6 GHz different 5G bands. The proposed BPF has an ultra-wide 3 dB passband of 2.97 GHz (2.35 GHz-5.32 GHz) and a 20 dB stopband of 4.59 GHz (6.18-10.77 GHz). The proposed BPF filter is fabricated, measured, and the results are in good agreement with their simulat...
The Applied Computational Electromagnetics Society Journal (ACES)
In this paper, a triple-band ultra-wideband UWB eight elements monopole antenna array is proposed... more In this paper, a triple-band ultra-wideband UWB eight elements monopole antenna array is proposed. This antenna array is designed with the minimum printed area and is prepared for wireless local area network (WLANs) power harvesting applications. It covers the bands of 2.4 GHz and 5 GHz, which makes it suitable for Wi-Fi frequencies to harvest their power. The eight-element antenna array dimensions are 28.5 cm by 15 cm. These dimensions are chosen for the mini-solar cell integration process. Low-cost FR4 material is used as a substrate. The proposed antenna’s measured reflection coefficient is compared with its simulated counterpart and is founded in good harmony.
This paper proposes a wideband ultra-compact implantable antenna for a wireless body area network... more This paper proposes a wideband ultra-compact implantable antenna for a wireless body area network (WBAN). The proposed patch antenna works in the industrial, scientific, and medical (ISM) bands. The proposed patch antenna with an ultra-compact size (5 × 5 × 0.26 mm3) was designed with 29% wide bandwidth (about 670 MHz). This wide bandwidth makes the antenna unaffected by implantation in different human body parts. The miniaturization process passed many steps by adding many slots with different shapes in the radiating element as well as in the ground plane. A 50 Ω coaxial feeding excites the antenna to maintain matching and low power loss. The specific absorption rate (SAR) was calculated for health considerations. The result was within the standard limits of IEEE organizations and the International Commission on Non-Ionizing Radiation Protection (ICNRP). The antenna was tested in tissues with multiple layers (up to seven layers) and at various depths (up to 29 mm). The link margin ...
A typical 5G multiple-input and multiple-output (MIMO) system must combine a high number of anten... more A typical 5G multiple-input and multiple-output (MIMO) system must combine a high number of antennas at both the transmitter and receiver to realize spatial multiplexing capability. In this paper, a wideband 16- element indoor base station (BS) antenna array that can cover 3.3–6.0 GHz is proposed for 5G applications. A π-shaped monopole antenna is designed to cover the Lower band (LTE bands 42/43–N77–N78), the intermediate band (N79), and the higher band (LTE 46). The antenna elements are arranged in a limited space printed on a substrate take the Hexakaidecagon Polygon shape. As the antenna elements are arranged with good isolation, achieving good polarization diversity. The proposed BS array is simulated, fabricated, and tested. The typical results, S-parameters, antenna efficiency, and radiation patterns are investigated. Moreover, to validate the MIMO performances, a very low envelope correlation coefficient (ECC) below 0.02, high antenna efficiency of about 82–93.2% are achieve...
2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), 2018
Microwave breast cancer detection has become an attractive method for cancer early detection proc... more Microwave breast cancer detection has become an attractive method for cancer early detection process. These systems uses directional and efficient antenna for transmitting and receiving signals. This paper is focused on the implementation of ultra-wideband, high gain, and directional microstrip antenna array for breast cancer detection system. Metamaterial cells are used for antenna gain enhancement purpose. Permeability and permittivity of metamaterial unit cell are obtained all over the operating bandwidth. Based on the metamaterial cell performance its geometry is altered to enhance the antenna gain at specific frequency band. Ultra wide band (UWB) unequal power divider is used to feed the proposed four elements antenna array based on Chebyshev excitation method. The proposed antenna has reasonable 3 dB beamwidth (3dBBW) and gain of 17.7 degrees and 14.5 dB at 4.12 GHz, respectively. The operating bandwidth (BW) which extends from 5.6 GHz to 10.9 GHz. The proposed antenna is fabricated, measured, and good agreement is obtained between simulated and measured results. Simulated specific absorption rate SAR is obtained and investigated for breast phantom where a small tumor is placed. The SAR results show clearly the tumor location in breast tissues which ensures the suitability of the proposed antenna array for cancer detection system.
2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), 2018
This paper introduces the detailed design and experimental demonstration of a narrow beamwidth an... more This paper introduces the detailed design and experimental demonstration of a narrow beamwidth and low side lobe level pyramidal horn antenna based on placing a ten directors Yagi array as an exciter instead of simple monopole antenna. Teflon rectangular parallelepiped is used as a dielectric material where Yagi array is placed for horn feeding purpose. Directors' length, position, separation, and their number are chosen carefully to obtain a high gain, suitable 3 dB beamwidth, and suitable side lobe level as compared to conventional one. The proposed pyramidal horn antenna achieves a simulated gain, 3 dB beamwidth, and side lobe level of 13.8 dBi, 37.4 degrees, and -26.3 dB at 4.86 GHz, respectively. The proposed antenna is mainly designed for breast cancer hyperthermia therapy where narrow beamwidth, low side lobe level, and high gain are essentially requisites. For verification purpose, the proposed antenna irradiate a breast phantom for 10 minutes and with 2 watt at its input port. The breast phantom temperature is elevated 4 degrees above normal temperature. These results candidates the proposed antenna for breast cancer hyperthermia treatment.
International Journal of Microwave and Wireless Technologies, 2022
In this paper, an ultra-compact implantable antenna for biomedical applications is proposed. The ... more In this paper, an ultra-compact implantable antenna for biomedical applications is proposed. The proposed implanted meandered compact patch antenna is implanted inside the body at a depth of 2 mm. The proposed antenna was designed with Roger RO3003 (ɛr = 3) as substrate with an overall size of dimensions 5 × 5 × 0.26 mm3. The radiating element is a square patch antenna with different size rectangular slots and coaxial feeding. The proposed implantable antenna resonates at 2.45 GHz (from 2.26 to 2.72 GHz) frequency with a bandwidth of 460 MHz and a gain of −22.6 dB. The specific absorption rate has been considered for health care considerations, and the result is within the limits of the federal communication commission. The measured and simulated scattering parameters are compared, and good agreements are achieved. The proposed antenna is simulated and investigated for biomedical applications suitability.
journal of engineering science and technology, 2017
In this paper, a proposed defected concrete post detection system is introduced. The proposed sys... more In this paper, a proposed defected concrete post detection system is introduced. The proposed system consists of two compact microstrip broad side antenna arrays resonating at 1 GHz with dimensions of 45 cm by 13.2 cm for each antenna array and a weight of 800 gm for both antenna arrays. Also a portable vector network analyser is used for scattering parameters measurement purpose. For size comparison purpose, a conventional microstrip antenna array is designed and compared with the proposed one at the same resonant frequency. A size reduction of 23.4 % is obtained. The proposed antenna array directivity of 10.5 dBi and 3 dB beam width of 30.7 are obtained which are suitable for the concrete post defect detection. The detection principle is relied on the coupling between the two antenna array elements. Three cases are considered for simulation and measurement, air, good concrete block and defected concrete block. A 10 dB difference in coupling was obtained between the presence and th...
This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) ar... more This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) array design for radar and microwave imaging applications. Initially, the radiation ares of the AVA is designed based on an elliptical curve shape. Next, the substrate end is shaped as a triangular shape and a negative index metamaterial (NIM) has been incorporated into the AVA aperture to act as a director. A gain enhancement of 2 dB is obtained for the proposed element compared to conventional one. The proposed antenna element is fabricated and measured. There is a good consistency between the simulated and measured return loss. In addition, four UWB Vivaldi antennas with substrate end shaping are placed along the z-axis in a linear antenna array configuration. The four NIM structures of the four antennas are placed together to form a sheet which is perpendicular to the four antenna substrates. A gain enhancement of about 6 dBi is obtained compared to the proposed single element through ...
─ This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. ... more ─ This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. The proposed antenna covers different bandwidths through only changing the cone geometry. Same ground plane shape and feeding system are used. Firstly, both conventional and proposed monocone antennas are designed, simulated and their simulated results are compared. One antenna cone is fabricated and measured for verification purpose. Good agreement is obtained between measured and simulated bandwidths. The measured bandwidth extends from 73 MHz to 500 MHz. Secondly, another antenna cone is designed and simulated without altering the upper or the lower cone radii. The second cone antenna bandwidth extends from 130 MHz to 1000 MHz. The receiver antenna of the commercial SIR 2000 impulse GPR is replaced by the proposed VHF-UHF first monocone antenna and the field test results are recorded and discussed. Index Terms ─ GPR, MCA.
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Papers by Dr-Tamer Abouelnaga