Monolithic implementation of air-buried microstrip lines for high-density microwave and millimeter wave ICs

Shin, Seong‐Ho; Jeong, Inho; Ko, Ju-Hyun; Kang, Myung-Gyu; Kwon, Young–Se

doi:10.1109/ectc.2002.1008226

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Ka-Band Branch Line Coupler Using High-Performance Air-Buried Microstrip Lines

Shin

Jeong²,

et al. 2003

33rd European Microwave Conference, 2003

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In this paper, a branch line coupler using airburied microstrip lines (ABMSLs) has been monolithically fabricated for millimeter-wave applications. Because the ABMSL structure employs air-dielectric medium and ground conductor walls surrounding strip signal line, it is very effective in reducing a dielectric loss, as well as parasitic coupling between close transmission lines over high frequency range. The fabricated branch line coupler shows a coupling and transmission loss of 3.6 dB and 3.9 dB, respectively at the center frequency of 29GHz. In the frequency range from 26GHz to 32GHz (20% bandwidth), it exhibits a return loss of better than 15 dB and isolation of better than 14 dB.33rd European Microwave Conference -Munich 2003

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