• Journal of IKEEE
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• v.28 no.3
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• pp.279-284
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• 2024

In this paper, we propose a novel method for implementing a microstrip patch antenna with circular polarization characteristics through an asymmetric inset feed structure. The proposed method involves designing an antenna by taking advantage of the length difference of the asymmetric inset slots inserted into the antenna, as well as the lengths of additional slots incorporated into the design to achieve circular polarization characteristics. Using this approach, we designed and fabricated an antenna operating at 2.4 GHz in the S-band for satellite communication systems, utilizing a 1 mm thick FR-4 dielectric substrate. The measurement results confirmed a gain of 2dBi, an axial ratio of less than 3dB, and a reflection coefficient below -10dB in the frequency range of 2.35 to 2.43 GHz. Based on these results, it is expected that by employing the proposed method, circularly polarized antennas utilizing inset feeds can be realised, thereby making them applicable in small satellite communication systems and various wireless IoT environmental service applications that use the ISM band.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.1
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• pp.1-5
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• 2011

The brand-new small output radio equipment which is over than 800MHz has an all-in-one interior antenna. We suggested new measuring method and developed related equipment because all-in-one radio equipment's performance evaluation requests old way, which is measuring transmitter output and antenna capacity separately, to be changed. That is, origin of small radio equipments with the 360 degree field measured by measuring the TRP, and also 360 degree opposite reception level measured at the radio equipment by measuring the TIS to make a quantitative evaluation was to be. Furthermore, we made managing frequencies, all-in-one radio equipment's best design and capacity management efficiently by measuring the gain of an antenna mounted on a PCB, the circuit around the genetic material, conductive material on the effects of radiation or the reception level.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.334-341
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• 2016

In this paper, the study of a waveguide aperture-coupled feed-structured antenna has been conducted for the purpose of applying it to a wireless back-haul system sufficient for high-capacity gigabits-per-second data rates. For this study, a $32{\times}32$ waveguide slot sub-array antenna with a corporate-feed structure was designed and produced. Also, this antenna is used at 57 GHz to 66 GHz in the V-band. The construction of the antenna is a laminated form with radiating parts (outer groove and slot, cavity), a coupled aperture, and feeds in each. The antenna was designed with HFSS, which is based on 3D-FEM, produced with aluminum processed by a precision-controlled milling machine, and assembled after a silver-plating process. The measurement result from analysis of the characteristics of the antenna shows that return loss is less than -12 dB, VSWR < 2.0, and a wide bandwidth ranges up to 16%. An overall first side lobe level is less than -12.3 dB, and a 3 dB beam width is narrow at about $1.85^{\circ}$. Also, antenna gain is 38.5 dBi, offering high efficiency exceeding 90%.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.10
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• pp.1154-1160
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• 2010

In this paper, a novel printed meander monopole antenna is proposed for wireless USB dongle applications. Dual-wideband resonance is obtained by utilizing a printed meander monopole radiator. The proposed antenna was fabricated on a thin FR-4 substrate with a thickness of 1 mm and a dielectric constant of 4.6. The antenna is fed by a $50{\Omega}$ coaxial cable. This novel USB dongle antenna measures only $10{\times}50mm^2$. The measured results demonstrates that the antenna supports WiBro, Bluetooth/ISM, WLAN, S-DMB, and WiMAX service bands.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.3
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• pp.395-400
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• 2021

In this paper, the wideband patch antenna is simulated and manufactured for the wireless LAN of 5GHz band that is defined in IEEE 802.11a. In the 802.11a, 200 channels of 675MHz are defined. Therefore, the bandwidth is needed more than 12.3%. For the wideband characteristics, low dielectric constant is realized with the multi-layer of 2 teflon substrates and the air dielectric layer and the feeding method of the coupled-line is used. Optimized wideband patch antenna is simulated with the return loss of 38.99dB at the center frequency of 5.43GHz and the bandwidth of 12.9%. The gain of manufactured patch antenna is 4.38, 4.52, and 5.12dBi at the channel number of 46, 56, and 153, respectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.4
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• pp.335-341
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• 2016

In this paper, we propose the method of controling the turns of a receiving coil for the matching directly to the receiver input impedance(typically $50{\Omega}$) with a maximum wireless power transfer(WPT) efficiency. Based on the presented the expression of the optimum load depending on a system figure of merit, number of the turns of a receiving coil, and proximity effect between conducting lines, the theoretical efficiencies have been compared with the measured ones with a good agreement. The results of this work may be used to realize a allowable maximum efficiency with a simple and low-profile 2-coil WPT system not requiring a separate feeding loop.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.584-587
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• 2007

PCS를 비롯하여 WLAN, DMB, W-CDMA, UWB 등의 무선통신 서비스가 증가함에 따라 안테나 동작 대역폭의 광대역화가 더욱 요구된다. 1/4 파장 선형 모노폴 안테나는 구조가 간단하고 전방향성을 갖는 복사특성으로 인하여 가장 널리 사용되는 안테나 중의 하나이다. 모노폴 안테나의 광대역화를 위해서 일반적으로 원통의 직경을 증가시키는 방법을 사용하지만, 평면 모노폴에 적용된 스텝 기법을 적용하여 광대역 특성을 얻을 수 있다. 그러나 스텝 모노폴 자체는 광대역 특성을 나타내지 않으며, 접지면에서도 일정 형태의 스텝 돌출부위가 필요하게 된다. 본 논문에서는 그라운드면의 볼록 계단 구조가 모노폴 안테나의 대역 특성에 미치는 영향을 분석하여 최적의 안테나 급전구조를 도출하고자 한다. 결과의 검증을 위해서 소프트웨어 시물레이션 및 측정결과를 제시한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1038-1039
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• 2015

미니트램(Mini-Tram)의 에너지 공급시스템은 유도급전(IPT: Inductive Power Transfer) 기반의 무선급속충전(Wireless High Speed Charging) 및 슈퍼커패시터(Supercapacitor) 기술을 융합하여 구성되었다. 기존의 전기이중층 커패시터(EDLC) 및 하이브리드 커패시터(LIC)는 급속충전을 위한 출력성능은 충족하지만, 낮은 에너지밀도 때문에 미니트램의 활용성을 제한하고 있다. 이에 수송시스템 분야에서의 커패시터의 경쟁력을 향상하기 위해서는 최소한의 공간 및 무게 조건을 충족함과 동시에 에너지 밀도를 극대화할 수 있는 하이브리드 커패시터의 개발이 요구된다. 본 논문에서는 개발 중인 미니트램의 에너지 요구량을 산정하여 매체의 개발목표 사양을 도출하고 이를 실현하기 위한 방안에 대해서 논하고자 한다.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.175-178
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• 2002

In This paper, a microstrip slot antenna is designed and fabricated for wireless LAN at 5.8GHz band. The microstrip slot antenna is fed by CPW and formed the inductively slot and tile capacitively slot. To obtain wideband, the inductively slot is designed at 5.3GHz and the capacitively slot is designed at 5.8GHz. Resonant frequency of the fabricated microstrip slol antenna is 5.BCD, the bandwidth for VS%<1.5 is 29% and the gain is 4.6dB. The 3-dB beamwidth of E-plane and H-plane is 80 “ and 120 ”, respectively

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.151-153
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• 2010

In this paper, the tri-band planar monopole microstrip antenna which stimulaneously meets the three bands such as TRS, WLAN and DMB is designed. The designed antenna size was smaller using CPW-fed structure that shows a ground-plane and a patch-plane are existed at one layer. The proposed antenna is designed on FR-4 substrate with a relative dielectric constant 4.3, thickness of 1.5mm and tangent loss 0.04. The designed antenna shows that VSWR is below 2 and has good return loss below -10dB over the three bandwidths.