Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1998-03-02
2000-04-18
Ham, Seungsook
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333206, H01P 512
Patent
active
06052040&
ABSTRACT:
A compact and highly effective dielectric duplexer comprises a dielectric ceramic block and a plurality of resonators arranged in a direction in the dielectric ceramic block, a half of the resonators constituting a transmitting section T, the remaining half of the resonators constituting a receiving section R, wherein an antenna terminal pad is capacitively coupled to the innermost resonator of the transmitting section T and to the innermost resonator of the receiving section R located adjacent to the innermost resonator to eliminate the use of a wave-dividing resonator, whereby the dielectric ceramic block can be dimensionally reduced in the direction along which resonators are arranged and hence it is adapted to down-sizing. Additionally, the coupling capacitance Ct of the antenna terminal pad and the transmitting section T is made greater than the coupling capacitance Cr of the antenna terminal pad and the receiving section R, whereby a return loss is reduced in both the transmitting section T and the receiving section R to improve the signal transmitting performance and the signal receiving performance of the dielectric duplexer.
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Patent Abstracts of Japan; vol. 95, No. 9, Oct. 31, 1995 & JP 07 147505A (Murata Mfg Co Ltd), Jun. 6, 1995 * abstract; Figure 5B *.
Patent Abstracts of Japan; vol. 97, No. 1, Jan. 31, 1997 & JP 08 228103A (Murata Mfg Co Ltd), Sep. 3, 1996 * abstract *.
Ham Seungsook
NGK Spark Plug Co. Ltd.
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