2018 International Symposium on Antennas and Propagation (ISAP), 2018
In this paper, we describe $\mathrm {a}4 \times 4$ microstrip patch array antenna with a high gai... more In this paper, we describe $\mathrm {a}4 \times 4$ microstrip patch array antenna with a high gain and low side lobe level (SLL) using a parallel and series combination feed network with different power distribution ratios. Several quarter-wavelength impedance transformers are connected, and the power distribution ratio is controlled by adjusting the characteristic impedance of the feed network. The optimized $4 \times 4$ microstrip patch array antenna has a $\vert \mathrm {S} _{\mathbf {11}} \vert \lt {(!{-}!)}10$ dB impedance bandwidth of 220 MHz which is a fractional bandwidth of 2.1%. At 12.5 GHz, the antenna has a gain of 18.2 dBi and SLLs of–28.0 and–26.5 dB in the x-z and y-z planes, respectively. The size of the array antenna is 100 mm $\times 100$ mm $\times 0.7874$ mm (3.5$\lambda \mathbf {o} { \times 3.5} \lambda \mathbf {o} { \times 0.028} \lambda \mathbf {o}$at 12.5 GHz).
2019 International Workshop on Antenna Technology (iWAT), 2019
This paper presents the effects of a split-ring resonator (SRR) slit position on the design of a ... more This paper presents the effects of a split-ring resonator (SRR) slit position on the design of a broadband printed dipole antenna. The antenna is made of two printed dipole arms enclosed by two rectangular and identically printed SRRs. One dipole arm with SRR is printed on the top side of the substrate, while the other dipole arm with SRR is printed on the bottom side of the substrate. By changing the SRR slit position, the different antenna characteristics are observable in terms of impedance bandwidth and radiation patterns. The optimized compact antenna has overall dimensions of 74.4 × 9.6 × 0.508 mm3 (0.469λ × 0.06λ × 0.0032λ at 1.895 GHz) with a fractional bandwidth of 54.350/0 (1.38 to 2.41 GHz for| S|11< −10 dB) and radiation efficiency of> 92%.
─ The design and performance of low-profile, multiple-feed metasurface antennas with different nu... more ─ The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a...
2015 9th European Conference on Antennas and Propagation (EuCAP), 2015
In this paper, we present a composite cavity-backed crossed dipole coupled to a magneto-electric ... more In this paper, we present a composite cavity-backed crossed dipole coupled to a magneto-electric (ME) dipole. The crossed dipole was fed by double-printed vacant-quarter rings to produce one minimum axial ratio (AR) point in the AR profile, and the presence of the ME dipole produced another minimum AR point. By combining these two minimum AR points, the antenna achieved a broadband AR bandwidth. In addition, the crossed dipole coupled to an ME dipole was incorporated with a cavity-backed reflector to provide a unidirectional radiation pattern with a wide AR beamwidth and a high front-to-back ratio.
This paper presents a design for a WLAN band rejection MIMO–UWB antenna The antenna consists of t... more This paper presents a design for a WLAN band rejection MIMO–UWB antenna The antenna consists of two coplanar waveguide fed monopole antennas with a pair of slots in the radiating patch that provides good rejection in the WLAN band. To enhance the isolation coefficient, a trident slot is etched into the ground plane. The main advantage of using the trident slot is that it possesses characteristics that are similar to single WLAN band rejection UWB antennas. The proposed antenna exhibits an isolation coefficient less than –15 dB across the entire UWB band with a VSWR less than 3, and good rejection at the WLAN band. Additionally, the antenna has an omnidirectional radiation pattern within the UWB band.
2019 International Conference on Electronics, Information, and Communication (ICEIC), 2019
In this paper, a flexible composite broadband dipole antenna printed with silver nanoflakes is pr... more In this paper, a flexible composite broadband dipole antenna printed with silver nanoflakes is presented. The antenna is composed of two identically printed split-ring resonators surrounding each arm of a printed dipole element. Each arm of the dipole and the split-ring resonator to which it couples is printed on the top and bottom sides of a thin dielectric substrate to give the antenna its flexibility. The compact antenna has overall dimensions of $10\ \mathbf{mm}\times 74.8\ \mathbf{mm}\times 0.254\ \mathbf{mm} (0.063\boldsymbol{\lambda},\times 0.473\boldsymbol{\lambda}\times 0.0016\boldsymbol{\lambda}$ at 1.9 GHz). The thin, flexible antenna produces stable, linearly polarized radiations in a broad bandwidth. Two antennas printed with copper and silver nanoflakes on a thin dielectric substrate were studied and their characteristics were compared. The printed antenna with copper cladding had a fractional bandwidth of 52.63%, peak gain of 2.14 dBi, and radiation efficiency of > 92%. The printed antenna with silver nanoflakes had a fractional bandwidth of 48.14%, peak gain of −0.78 dBi, and radiation efficiency of > 15% within the impedance bandwidth.
This paper presents an ultra-low-profile copper indium gallium selenide (CIGS) based solar cell i... more This paper presents an ultra-low-profile copper indium gallium selenide (CIGS) based solar cell integrated antenna with a high form factor. A tiny slot was etched from the solar cell to develop an ultra-low-profile solar-cell-integrated antenna. This tiny slot increases the form factor due to the small clearance area from the solar cell. A ground-radiation antenna design method was applied in which lumped elements were employed inside the tiny slot for antenna operation. Another substrate was used under the solar cell for designing the feeding structure with lumped elements connected to the tiny slot using via holes. A prototype was fabricated and measured to verify the operation of a built-in solar-cell antenna and validate the simulated results. The measured results demonstrate that the solar-cell-integrated antenna covers the entire frequency range of the Industrial Scientific Medical band, from 2.4 to 2.5Â GHz, with a maximum gain of 2.79 dBi and radiation efficiency higher than ...
2018 International Symposium on Antennas and Propagation (ISAP), 2018
In this paper, we describe $\mathrm {a}4 \times 4$ microstrip patch array antenna with a high gai... more In this paper, we describe $\mathrm {a}4 \times 4$ microstrip patch array antenna with a high gain and low side lobe level (SLL) using a parallel and series combination feed network with different power distribution ratios. Several quarter-wavelength impedance transformers are connected, and the power distribution ratio is controlled by adjusting the characteristic impedance of the feed network. The optimized $4 \times 4$ microstrip patch array antenna has a $\vert \mathrm {S} _{\mathbf {11}} \vert \lt {(!{-}!)}10$ dB impedance bandwidth of 220 MHz which is a fractional bandwidth of 2.1%. At 12.5 GHz, the antenna has a gain of 18.2 dBi and SLLs of–28.0 and–26.5 dB in the x-z and y-z planes, respectively. The size of the array antenna is 100 mm $\times 100$ mm $\times 0.7874$ mm (3.5$\lambda \mathbf {o} { \times 3.5} \lambda \mathbf {o} { \times 0.028} \lambda \mathbf {o}$at 12.5 GHz).
2019 International Workshop on Antenna Technology (iWAT), 2019
This paper presents the effects of a split-ring resonator (SRR) slit position on the design of a ... more This paper presents the effects of a split-ring resonator (SRR) slit position on the design of a broadband printed dipole antenna. The antenna is made of two printed dipole arms enclosed by two rectangular and identically printed SRRs. One dipole arm with SRR is printed on the top side of the substrate, while the other dipole arm with SRR is printed on the bottom side of the substrate. By changing the SRR slit position, the different antenna characteristics are observable in terms of impedance bandwidth and radiation patterns. The optimized compact antenna has overall dimensions of 74.4 × 9.6 × 0.508 mm3 (0.469λ × 0.06λ × 0.0032λ at 1.895 GHz) with a fractional bandwidth of 54.350/0 (1.38 to 2.41 GHz for| S|11< −10 dB) and radiation efficiency of> 92%.
─ The design and performance of low-profile, multiple-feed metasurface antennas with different nu... more ─ The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a...
2015 9th European Conference on Antennas and Propagation (EuCAP), 2015
In this paper, we present a composite cavity-backed crossed dipole coupled to a magneto-electric ... more In this paper, we present a composite cavity-backed crossed dipole coupled to a magneto-electric (ME) dipole. The crossed dipole was fed by double-printed vacant-quarter rings to produce one minimum axial ratio (AR) point in the AR profile, and the presence of the ME dipole produced another minimum AR point. By combining these two minimum AR points, the antenna achieved a broadband AR bandwidth. In addition, the crossed dipole coupled to an ME dipole was incorporated with a cavity-backed reflector to provide a unidirectional radiation pattern with a wide AR beamwidth and a high front-to-back ratio.
This paper presents a design for a WLAN band rejection MIMO–UWB antenna The antenna consists of t... more This paper presents a design for a WLAN band rejection MIMO–UWB antenna The antenna consists of two coplanar waveguide fed monopole antennas with a pair of slots in the radiating patch that provides good rejection in the WLAN band. To enhance the isolation coefficient, a trident slot is etched into the ground plane. The main advantage of using the trident slot is that it possesses characteristics that are similar to single WLAN band rejection UWB antennas. The proposed antenna exhibits an isolation coefficient less than –15 dB across the entire UWB band with a VSWR less than 3, and good rejection at the WLAN band. Additionally, the antenna has an omnidirectional radiation pattern within the UWB band.
2019 International Conference on Electronics, Information, and Communication (ICEIC), 2019
In this paper, a flexible composite broadband dipole antenna printed with silver nanoflakes is pr... more In this paper, a flexible composite broadband dipole antenna printed with silver nanoflakes is presented. The antenna is composed of two identically printed split-ring resonators surrounding each arm of a printed dipole element. Each arm of the dipole and the split-ring resonator to which it couples is printed on the top and bottom sides of a thin dielectric substrate to give the antenna its flexibility. The compact antenna has overall dimensions of $10\ \mathbf{mm}\times 74.8\ \mathbf{mm}\times 0.254\ \mathbf{mm} (0.063\boldsymbol{\lambda},\times 0.473\boldsymbol{\lambda}\times 0.0016\boldsymbol{\lambda}$ at 1.9 GHz). The thin, flexible antenna produces stable, linearly polarized radiations in a broad bandwidth. Two antennas printed with copper and silver nanoflakes on a thin dielectric substrate were studied and their characteristics were compared. The printed antenna with copper cladding had a fractional bandwidth of 52.63%, peak gain of 2.14 dBi, and radiation efficiency of > 92%. The printed antenna with silver nanoflakes had a fractional bandwidth of 48.14%, peak gain of −0.78 dBi, and radiation efficiency of > 15% within the impedance bandwidth.
This paper presents an ultra-low-profile copper indium gallium selenide (CIGS) based solar cell i... more This paper presents an ultra-low-profile copper indium gallium selenide (CIGS) based solar cell integrated antenna with a high form factor. A tiny slot was etched from the solar cell to develop an ultra-low-profile solar-cell-integrated antenna. This tiny slot increases the form factor due to the small clearance area from the solar cell. A ground-radiation antenna design method was applied in which lumped elements were employed inside the tiny slot for antenna operation. Another substrate was used under the solar cell for designing the feeding structure with lumped elements connected to the tiny slot using via holes. A prototype was fabricated and measured to verify the operation of a built-in solar-cell antenna and validate the simulated results. The measured results demonstrate that the solar-cell-integrated antenna covers the entire frequency range of the Industrial Scientific Medical band, from 2.4 to 2.5Â GHz, with a maximum gain of 2.79 dBi and radiation efficiency higher than ...
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Papers by Ikmo Park