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High‐performance air‐buried microstrip lines and Ka‐band branch line coupler
Author(s) -
Shin SeongHo,
Jeong Inho,
Kwon YoungSe
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21295
Subject(s) - conductor , microstrip , return loss , microwave , insertion loss , materials science , transmission line , optoelectronics , center frequency , bandwidth (computing) , electrical engineering , optics , engineering , telecommunications , band pass filter , physics , composite material , antenna (radio)
An air‐buried microstrip line (ABMSL) is monolithically fabricated on a glass substrate using a cost‐effective multilayer process. The insertion loss of the line is 0.07 dB/mm and it shows high‐isolation characteristics between close transmission lines. Using the ABMSL, a branch‐line coupler is monolithically fabricated. Because the ABMSL structure employs air‐dielectric medium and ground conductor walls surrounding a strip conductor line, it is very effective for reducing dielectric loss and parasitic coupling between close transmission lines over a high‐frequency range. The fabricated branch‐line coupler shows coupling and transmission losses of 3.6 and 3.9 dB, respectively, at the center frequency of 29 GHz. In the frequency range from 26 to 32 GHz (20% bandwidth), the return loss is below than 15 dB and the isolation is better than 14 dB. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 167–170, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21295