• 한국산학기술학회논문지
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• 제15권12호
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• pp.7309-7316
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• 2014

본 논문에서는 마이크로스트립 전송선로를 이용하여 소출력 이동통신 기지국용 삼중대역 멀티플렉서를 설계하고 제작하였다. 이 멀티플렉서는 셀룰러, WCDMA, 그리고 LTE를 포함하는 3개의 이동통신 주파수대역에서 이용 가능하도록 설계하였으며, 통과대역에서는 0.8 dB 삽입손실과 1.5 이하의 정재파비 그리고 차단대역에서는 15dB 이상의 대역저지 특성을 가지도록 설계하였다. 제작된 삼중대역 멀티플렉서 시료로부터 얻어진 신뢰성 테스트의 결과, 모든 시료의 제반 특성이 통과 대역 824~894 MHz, 1920~2170 MHz, 2500~2690 MHz에서 최대 삽입손실 0.71dB, 정재파비 1.38, 저지대역 감쇄 15 dB 이상을 보임으로써 우수한 성능과 설계 규격에서 정한 규정을 매우 잘 충족하고 있다.

• Journal of the Optical Society of Korea
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• 제18권3호
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• pp.261-273
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• 2014

In this paper, metal insulator metal (MIM) plasmonic slot cavity narrow band-pass filters (NBPFs) are studied. The metal and dielectric of the structures are silver (Ag) and air, respectively. To improve the quality factor and attenuation range, two novel NBPFs based on tapered structures and double cavity systems are proposed and numerically analyzed by using the two-dimensional (2-D) finite difference time domain (FDTD) method. The impact of different parameters on the transmission spectrum is scrutinized. We have shown that increasing the cavities' lengths increases the resonance wavelength in a linear relationship, and also increases the quality factor, and simultaneously the attenuation of the wave transmitted through the cavities. Furthermore, increasing the slope of tapers of the input and output waveguides decreases attenuation of the wave transmitted through the waveguide, but simultaneously decreases the quality factor, hence there should be a trade-off between loss and quality factor. However, the idea of adding tapers to the waveguides' discontinuities of the simple structure helps us to improve the device total performance, such as quality factor for the single cavity and attenuation range for the double cavity. According to the proposed NBPFs, two, three, and four-port power splitters functioning at 1320 nm and novel ultra-compact two-wavelength and triple-wavelength demultiplexers in the range of 1300-1550 nm are proposed and the impacts of different parameters on their performances are numerically investigated. The idea of using tapered waveguides at the structure discontinuities facilitates the design of ultra-compact demultiplexers and splitters.