High frequency filter

Details High frequency filter High frequency filter

H - Electricity

01

P

333/68

H01P 1/20 (2006.01) H01P 1/205 (2006.01) H01P 7/10 (2006.01)

Patent

CA 1162622

ABSTRACT OF THE DISCLOSURE A high frequency filter for frequencies from the VHF band upwards has a closed conductive housing, input and output means such as antennas provided at opposite ends of the housing, a plurality of resonators arranged between the input and output means, each of the resonators having an elongated inner conductor with a circular cross section, and an elongated rectangular dielectric body surrounding the inner conductor, one end of each resonator being fixed to a common wall of the housing and the other end of each resonator being free standing. The length of each inner conductor and dielectric body is substantially 1/4 wave- length, and the distance between two resonators is deter- mined according to the coupling coefficient required for the desired characteristics of the filter. Due to the rectangular dielectric body, each resonator can be stably mounted on the housing, and thus stable filter characteris- tics are obtained. Hence use in high vibration applications such as mobile communication is possible. The rectangular dielectric body also provides larger coupling coefficients between resonators, and thus a wideband filter can be obtained.

375590

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