• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.297-300
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• 2008

본 논문에서는 GSM/DCS/USPCS/WCDMA대역에서 사용할 수 있는 IFA 형태의 내장형 안테나를 설계하고 이를 제작하였다. 이 안테나는 제한된 공간에서 기본 IFA에 전류 흐름의 상쇄작용을 고려하여 4중 대역을 형성 시켰으며, GSM대역에서 Maximum Gain 2.23dBi~2.89dBi, DCS/USPCS/WCDMA대역에서 -3.24dBi~0.74dBi의 결과를 얻었다. 방사패턴 또한 전방향성에 가까운 특성을 가지고 있으며 전체적인 평균효율은 약 15% 향상됨을 확인할 수 있다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.3
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• pp.389-398
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• 2011

In this paper, the design and fabrication of a transmit/receive(T/R) module for Ka-band phased array radar is presented. A 5bit digital phase shifter and digital attenuator were used in common for both transmitter and receiver considering unique Ka-band characteristic. The circulator was excluded in the T/R module and was placed outside T/R module. The transmitting power per element antenna is designed to be about 1 W and the noise figure is designed to be below 8 dB. The designed T/R module RF part has a compact size of $5\;mm{\times}4\;mm{\times}57\;mm$. In order to implement the T/R module, MMICs used in T/R module was separately assessed before assembly of the designed T/R module. The transmitter of the fabricated T/R module shows about 1 W at 5 dBm unit module input power and the receiver shows a gain of about 20 dB and a noise figure of below 8 dB as expected in the design stage.