A Ku-Band Transversal Filter Using Directional Couplers Made of a Multilayer Ceramic

Toshiro HIRATSUKA  Yutaka IDA  Nobuaki IMAI  Eiichi OGAWA  

IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.8   pp.1134-1138
Publication Date: 1995/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Microwave and Millimeter-Wave Technology)
transversal filter,  resonator filter,  directional coupler,  multilayer ceramic,  

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A Ku-band transversal filter with a center frequency of 12 GHz and a bandwidth of 6 GHz using directional couplers made of a multilayer ceramic has been proposed and developed. The directional coupler can realize a wide range of frequency characteristics, e.g. coupling of 3.50.5 dB in the frequency range of 10 to 17 GHz and a wide range of coupling values, i.e. 3 to 35 dB. Calculations have confirmed that the increase in insertion loss due to a decreasing Q-factor can be much less than that for a resonator filter. The transversal filter was fabricated without additional tuning, and measured results agreed well with calculated values.