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Compact Frequency-Reconfigurable Half-Mode Substrate-Integrated Waveguide Antenna
Sam, Somarith,Sungjoon Lim IEEE 2013 IEEE antennas and wireless propagation letters Vol.12 No.-
<P>A frequency-reconfigurable antenna based on half-mode substrate-integrated waveguide (HMSIW) technology for size reduction is presented. Its resonant frequency is electronically controlled by a varactor-loaded interdigital capacitor on the top plate of the HMSIW, and the bias network is designed on the bottom plate. Its performance is demonstrated experimentally, with the resonant frequency varied from 2.99 to 3.59 GHz by changing the bias voltage from 0 to 30 V.</P>
Sam, Somarith,Sungjoon Lim IEEE 2013 IEEE transactions on antennas and propagation Vol.61 No.10
<P>Electrically small antennas are proposed, based on a substrate-integrated waveguide (SIW) and a complementary split-ring resonator (CSRR). The antenna's electrical size is reduced by introducing both CSRR and the eight-mode substrate-integrated wave guide (EMSIW). A forward electromagnetic wave can be achieved with frequency below the characteristic waveguide cuff-off frequency due to the CSRR. The EMSIW occupies only 12.5% of the conventional SIW with the same dominant resonant frequency. In addition, by rotating the CSRR on the EMSIW, the resonant frequency of the antenna is varied, while maintaining the same radiation pattern and performance. The S-parameters and radiation patterns are investigated by a full-wave simulation and measurement. The resonant frequency is changed from 4.74 GHz to 5.07 GHz by varying the orientation of the CSRR from 0 to 360 degrees. Omnidirectional radiation patterns are observed, and the measured peak gains are 4.5-5.9 dBi.</P>
Somarith, Sam,Hyunseong Kang,Sungjoon Lim Institute of Electrical and Electronics Engineers 2014 IEEE Transactions on Antennas and Propagation Vol. No.
<P>A novel frequency reconfigurable substrate integrated waveguide-interdigital capacitor (SIW-IDC) antenna is presented. The antenna is designed based on a composite right/left-handed (CRLH) resonator, which is realized by the SIW-IDC. Thanks to CRLH characteristics, the antenna size is reduced. Since the IDC determines the resonant frequency, a varactor diode is embedded on the interdigital slot of the short-ended SIW. Its zeroth-order resonance (ZOR) frequency is varied from 4.13 GHz to 4.50 GHz by changing the bias voltage from 0 V to 36 V while keeping good impedance matching better than 15 dB. The radiation performance is numerically and experimentally investigated. Very good agreements between the simulated and measured S-parameters and radiation patterns are observed.</P>
상보적 분할 링 공진기를 이용한 전기적으로 작은 1/8 모드 기판 집적형 도파관 안테나
강현성(Hyunseong Kang),Somarith Sam,임성준(Sungjoon Lim) 한국전자파학회 2013 한국전자파학회논문지 Vol.24 No.7
본 논문은 기판 집적형 도파관(SIW: Substrate Integrated Waveguide)와 상보적 분할링 공진기(CSRR: Complementary Split Ring Resonator)를 기반으로 한 전기적으로 작은 안테나를 제안한다. 안테나의 전기적 크기는 CSRR과 기존 SIW의 1/8크기인 Eighth-Mode Substrate Integrated Waveguide(EMSIW)를 적용하여 줄일 수 있었다. EMSIW는 기존의 SIW와 비교하였을 때 공진 주파수는 유지하면서 단지 12.5 %의 크기를 차지한다. 또한, EMSIW 안에 CSRR을 회전함으로써 안테나의 방사 특성을 유지하면서 공진 주파수를 바꿀 수 있었다. CSRR을 0°부터 360°까지 회전시켜 공진 주파수를 4.74 GHz에서 5.07 GHz까지 변화를 줄 수 있었다. 단향성 방사 패턴이 발생하며, 그 최대 이득은 4.5 dBi에서 5.92 dBi로 관측되었다. Based on a substrate integrated waveguide(SIW) and a complementary split ring resonator(CSRR), electrically small antennas are proposed in this paper. Antenna"s electrical size is reduced by introducing both CSRR and the eighth-mode substrate integrated waveguide(EMSIW). The EMSIW occupies only 12.5 % of the conventional SIW at the same dominant resonant frequency. In addition, the resonant frequency of the antenna is varied by rotating the CSRR on the EMSIW while keeping the same radiation patterns. The resonant frequency is changed from 4.74 GHz to 5.07 GHz by varying orientation of the CSRR from 0 to 360 degree. Unidirectional radiation patterns are observed and the measured peak gains are from 4.50 to 5.92 dBi.