• 전기학회논문지
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• 제59권12호
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• pp.2268-2272
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• 2010

This letter presents that a rectenna can utilize more stable wireless power by using a new design dual band/dual polarization microstrip patch antenna and 2 stage voltage multiplier at 2.4 GHz band and 3.1 GHz band. The proposed antenna is a new microstrip patch antenna design to make impedance matching possible by using slotted capacitive coupling between the patch and $50\Omega$ feed line on a ground plane. Its advantage is that the size of the rectenna can be reduced by using $50\Omega$ feed line on the ground plane, which can be used efficiently. The dual band/dual polarization microstrip patch antenna shows circular polarization at 2.4 GHz band and linear polarization at 3.1 GHz band. Under -10 dB return loss, The dual band/dual polarization microstrip patch antenna obtains 340 MHz bandwidth as 2.23~2.57 GHz and 375 MHz bandwidth as 2.95~3.325 GHz. Also, 2 Stage Voltage multiplier is possible to operate at 2.4 GHz band and 3.1 GHz band. The designed retenna can usually obtain wireless power at both 3.1 GHz band, and 2.4 GHz band applications such as Wi-Fi, Bluetooth, Wireless LAN, etc. So more stable wireless power can be utilized at the same time.

• 전기학회논문지
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• 제59권7호
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• pp.1282-1288
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• 2010

This paper proposes a novel microstrip patch antenna to make impedance matching possible by using slot/T-slot capacitive coupling between the patch and 50 $\Omega$ feed line on a ground plane. The single band/linear polarization patch antenna shows linear polarization at 2.4 GHz band. Under -10 dB return loss, the single band/linear polarization patch antenna obtains 50 MHz bandwidth at 2.37 GHz~2.42 GHz. The dual band/dual polarization microstrip patch antenna shows circular polarization at 2.4 GHz band and linear polarization at 3.1 GHz band. Under -10 dB return loss, The dual band/dual polarization microstrip patch antenna obtains 340 MHz bandwidth at 2.23~2.57 GHz and 375 MHz bandwidth at 2.95~3.325 GHz.

• 한국위성정보통신학회논문지
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• 제11권3호
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• pp.127-132
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• 2016

This paper presents the design of a palm-sized metamaterial antenna system having reconfigurable polarization as well as dual-band characteristics. Basically, three antennas are laid by 45 degrees in order and excited by a compact metamaterial dual-band power-divider of the in-phase outputs, and the radiated fields of the antennas are mixed to turn the vector of the polarization to another. The validity of the proposed method is verified by observing the in-phase outputs from the odd-numbered power-dividing device for both 900 MHz and 2.4 GHz, and checking the changeable polarization with the antenna gain over 2 dBi for all the polarizations.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.418-422
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• 2003

In this paper a dual-band circularly polarized stacked microstrip antenna for Global Positioning System (GPS) service and Digital Multimedia Broadcasting (DMB) service is designed. By stacking two different corner-truncated square microstrip patches, dual-band, dual polarization characteristic is obtained. Experimental results show impedance bandwidth of 60 MHz (3.8%) and axial ratio bandwidth of 6 MHz (0.4%) in GPS and impedance bandwidth of 126 MHz (4.7%) and axial ratio bandwidth of 30MHz (1.1%) in DMB.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1250-1256
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• 2017

This paper proposes the design of microstrip patch antennas for dual-band polarization adjustment. The antenna has a multi-layer structure for dual-band operation, and each layer contains a resonating patch with surrounding strips separated into two parts. The antenna polarization is adjusted by varying the separated positions of the strips, while fixing other design parameters. To demonstrate the feasibility, an antenna sample with right-hand circular polarization is fabricated, and its antenna characteristics are measured in a full anechoic chamber. The operating principle of polarization adjustment in the dual frequency bands is also verified by observing near electromagnetic fields and the magnetic surface current density around the antenna.

• 대기
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• 제24권3호
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• pp.365-378
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• 2014

The limits of S-band dual-polarization radars in Korea are not reflected on the recent weather forecasts of Korea Meteorological Administration and furthermore, they are only utilized for rainfall estimations and hydrometeor classification researches. Therefore, this study applied four merging methods [SA (Simple Average), WA (Weighted Average), SSE (Sum of Squared Error), TV (Time-varying mergence)] to the QPE (Quantitative Precipitation Estimation) model [called RAR (Radar-AWS Rainfall) calculation system] using single-polarization radars and S-band dual-polarization radar in order to improve the accuracy of the rainfall estimation of the RAR calculation system. As a result, the merging results of the WA and SSE methods, which are assigned different weights due to the accuracy of the individual model, performed better than the popular merging method, the SA (Simple Average) method. In particular, the results of TVWA (Time-Varying WA) and TVSSE (Time-Varying SSE), which were weighted differently due to the time-varying model error and standard deviation, were superior to the WA and SSE. Among of all the merging methods, the accuracy of the TVWA merging results showed the best performance. Therefore, merging the rainfalls from the RAR calculation system and S-band dual-polarization radar using the merging method proposed by this study enables to improve the accuracy of the quantitative rainfall estimation of the RAR calculation system. Moreover, this study is worthy of the fundamental research on the active utilization of dual-polarization radar for weather forecasts.

• 한국전자파학회논문지
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• 제26권7호
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• pp.606-612
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• 2015

본 논문에서는 차량 내부 단말 통신을 위한 이중대역 직교편파 마이크로스트립 안테나를 제안하였다. 제안한 안테나는 서로 수직한 선형 편파를 형성하기 위한 수직한 이중 급전 부분과 이중대역 동작을 구현하기 위한 H 모양의 폐루프형 슬롯이 구비된 방사체로 구성된다. 방사체에 구비한 H 모양의 폐루프형 슬롯은 방사체의 각 변의 급전 부분에 따라 기하학적으로 다른 효과를 발생시키기 때문에, 제안한 안테나는 두 개의 동작 주파수에서 서로 수직한 선형 편파로 동작한다. 제안한 안테나는 1.8 GHz에서 지표면에 수직한 선형 편파와 2.4 GHz에서 지표면에 수평한 선형 편파로 동작함을 이론 및 실험적으로 검증하였다. 제작한 안테나의 모의실험과 측정실험 결과는 반사 계수, 방사패턴 및 안테나 이득에서 잘 일치되었다.

• 한국위성정보통신학회논문지
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• 제8권3호
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• pp.47-51
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• 2013

본 논문에는 Ka 대역 VSAT용 반사판 안테나의 급전부에 사용하기 위한 이중대역 직교모드변환기의 설계와 실험 결과를 보였다. 설계된 직교모드변환기는 20Ghz의 수신대역 주파수 영역과 30GHz의 송신대역 주파수 영역에서 동작하는 두 개의 선형 직교 편파된 신호를 분리하기 위해서 광대역 특성을 갖는다. 또한, 급전 부품의 부피를 작게 하기 위해서 Boifot 접합 기반의 직교모드변환기를 이중 대역을 갖도록 설계를 하였다. 설계 검증을 위한 실험결과 수평편파에 대해서 수신대역과 송신대역의 반사손실은 각각 20dB와 21dB 이상의 특성을 나타냈으며, 수직편파에 대해서는 20dB와 24dB 이상의 특성을 보였다. 수평편파와 수직편파에 대한 격리도 특성은 수신대역과 송신대역에서 각각 43dB와 52dB 이상을 보였다.

• 한국전자통신학회논문지
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• 제7권6호
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• pp.1287-1292
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• 2012

본 논문에서는 주파수 1.525GHz~1.665GHz 넓은 대역에서 동작하는 이중편파 패치안테나를 설계 및 제작하였다. 넓은 대역폭 및 고 이득을 갖기 위해 GND기판으로 부터 Air층을 높게 적용하였으며, 광대역 축비 및 고 이득을 갖기 위해 기생패치를 적용하여 원하는 데이터를 얻을 수 있도록 하였다. 그 결과 안테나의 정재파비(VSWR)는 전 대역에서 1.9 이하를 나타내며, 반사손실 S11과 S22는 전 대역에서 -10dB이하로 시뮬레이션과 유사한 특성 결과를 얻었다. LHCP(Left Hand Circular Polarization) 및 RHCP(Right Hand Circular Polarization)의 격리 특성은 시뮬레이션 특성보다 더 개선되어 전 대역에서 -13dB이하로 만족한 결과를 얻었다.

• Journal of electromagnetic engineering and science
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• 제18권4호
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• pp.215-220
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• 2018

This study presents a dual-band polarization-reconfigurable antenna that comprises a large square patch with a pair of corner-cut edges and two small square patches with a shorting via. Two PIN diodes are located between the large square patch and two small square patches. Depending on the bias state applied to the two PIN diodes, each small patch may be disconnected or connected to the large square patch. As a result, the proposed antenna can provide polarization reconfigurability between two orthogonal linear polarizations. Further, the proposed antenna operates at 2.51 GHz and 2.71 GHz. From the measured results, the proposed antenna shows a 10 dB bandwidth of 2.39% (2.49-2.55 GHz) and 2.58% (2.68-2.75 GHz). In this work, the frequency ratio can be easily controlled by changing the size of the small patch.