Slots

In this research work, a novel compact antenna with rectangular slots is presented for radio frequency identification (RFID) handled applications in the ultrahigh frequency (UHF) band that can be manufactured and integrated into RFID readers without difficult. A prototype demonstrating the aforementioned features was constructed and measured. The proposed antenna is fed by 50-Ω coaxial cable and printed on a 1.6mm thick FR4 substrate which has a small size and occupies a volume of 68×66 ×1.6mm 3. The patch, the feed-line and ground plane are made of PEC (Perfect Electric Conductor) with a thickness of 0.035 mm. Measured results indicate that the proposed antenna has a good impedance matching characteristic ranging from 889 to 939MHz, which covers the USA RFID-band (902-928MHz), the Chinese RFID-operating-band (920-924.5MHz), and the Korea and Japan RFID-band (917-923.5MHz). These results were achieved by the insertion of slots in the compact structure of the antenna. The electromagnetic simulators HFSS (High Frequency structure simulator) and CST (Computer Simulation Technology) microwave studio were used for the design, modeling and simulation of the antenna. The focus of the study of our antenna was on the parameters of return loss, bandwidth, Voltage Standing Wave Ratio (VSWR), input impedance and gain. 1. INTRODUCTION The radio frequency identification technology (RFID) is the current dominating technology in wireless communication because it provides a much more flexible way of non-contact communication. As of late, RFID systems have been receiving an increasing amount of interest [1]-[2] both from the scientific and industrial communities. These systems are founded on saving and extracting wireless data that concern the object to identify. The interchange of data and information is done by using radiofrequency electromagnetic fields. An RFID system generally contains a reader, a tag, and a data processing system. Figure 1 exhibits the functioning of the RFID system [3]. The energy is transmitted by the reader (fitted with an antenna) to the RFID Tag by the way of radio-frequency waves. This energy is used to activate the tag by sending an information request to which the tag located within its magnetic field responds [4], [5]. The reader is usually connected to a host data processing system that embodies the information of the identified item and communicates with other remote data processing systems [6]. In reference to the ISO (International Standardization Organization) standard, the RFID frequency bands are the LF (Low Frequency) at 125 kHz [7], the HF (High Frequency) band at 13.56MHz [8], the UHF band from 860 to 960MHz, [9], and 2.45GHz [10] and 5.8GHz bands [11], [12]. Because of the advantages

A compact microstrip patch antenna with wide operational bandwidth is presented.The proposed design consists of rectangular patch antenna in ring shaped with U-slots cut in ground.Antenna is fed by microstrip line.The performance of rectangular patch antenna has been discussed and analyzed by modification of the width and length of patch dimensions as given in the previous work [1].The design proposed that antenna is having good bandwidth, gain and return loss in frequency band between 3.5-5 GHz.At resonant frequency 2 GHz antenna has bandwidth of 10 % and return loss up to-44 dB which are good as compare to reference results. Proposed antenna has been analyzed using IE3D and simulated results are presented in terms of bandwidth, gain and return loss at different frequencies.

In this research work, a novel compact antenna with rectangular slots is presented for radio frequency identification (RFID) handled applications in the ultrahigh frequency (UHF) band that can be manufactured and integrated into RFID readers without difficult. A prototype demonstrating the aforementioned features was constructed and measured. The proposed antenna is fed by 50-Ω coaxial cable and printed on a 1.6mm thick FR4 substrate which has a small size and occupies a volume of 68×66 ×1.6mm3. The patch, the feed-line and ground plane are made of PEC (Perfect Electric Conductor) with a thickness of 0.035 mm. Measured results indicate that the proposed antenna has a good impedance matching characteristic ranging from 889 to 939MHz, which covers the USA RFID-band (902–928MHz), the Chinese RFID-operating-band (920–924.5MHz), and the Korea and Japan RFID-band (917–923.5MHz). These results were achieved by the insertion of slots in the compact structure of the antenna. The electromagne...

This paper presents the results of an investigation of a new version of a leaky wave antenna that is based on a substrate integrated waveguide (SIW). The structure of SIW is composed of two rows of cylinders between metal plates; it can be easily produced by the standard method PCB" circuit" or LTCC method, the antenna is designed so that it can radiate in C-band. The direction of the main lobe of the antenna radiation pattern can be steered by changing the frequency in the band from backward direction to forward direction; the effect of increasing the number of slot arrays has also been analyzed to study the effect on radiation patterns. The numerical simulations have been performed using a commercial CST Microwave studio.

In this research work, a novel compact antenna with rectangular slots is presented for radio frequency identification (RFID) handled applications in the ultrahigh frequency (UHF) band that can be manufactured and integrated into RFID readers without difficult. A prototype demonstrating the aforementioned features was constructed and measured. The proposed antenna is fed by 50-Ω coaxial cable and printed on a 1.6mm thick FR4 substrate which has a small size and occupies a volume of 68×66 ×1.6mm3. The patch, the feed-line and ground plane are made of PEC (Perfect Electric Conductor) with a thickness of 0.035 mm. Measured results indicate that the proposed antenna has a good impedance matching characteristic ranging from 889 to 939MHz, which covers the USA RFID-band (902–928MHz), the Chinese RFID-operating-band (920–924.5MHz), and the Korea and Japan RFID-band (917–923.5MHz). These results were achieved by the insertion of slots in the compact structure of the antenna. The electromagne...

This paper presents the results of an investigation of a new version of a leaky wave antenna that is based
on a substrate integrated waveguide (SIW). The structure of SIW is composed of two rows of cylinders
between metal plates; it can be easily produced by the standard method PCB" circuit" or LTCC method,
the antenna is designed so that it can radiate in C-band. The direction of the main lobe of the antenna
radiation pattern can be steered by changing the frequency in the band from backward direction to forward
direction; the effect of increasing the number of slot arrays has also been analyzed to study the effect on
radiation patterns. The numerical simulations have been performed using a commercial CST Microwave
studio

This paper presents the results of an investigation of a new version of a leaky wave antenna that is based on a substrate integrated waveguide (SIW). The structure of SIW is composed of two rows of cylinders between metal plates; it can be easily produced by the standard method PCB" circuit" or LTCC method, the antenna is designed so that it can radiate in C-band. The direction of the main lobe of the antenna radiation pattern can be steered by changing the frequency in the band from backward direction to forward direction; the effect of increasing the number of slot arrays has also been analyzed to study the effect on radiation patterns. The numerical simulations have been performed using a commercial CST Microwave studio.