Title: Microwave band-pass filter
Application Number: 200610071694 Application Date: 2006.03.28
Publication Number: 1841838 Publication Date: 2006.10.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H01P1/20,H01P7/04
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Mueller Johannes
Attorney & Agent: li deshan
Abstract:
     The present invention relates to a microwave band-pass filter comprising a plurality of coupled resonators including at least one coaxial resonator (1). For suppression of higher order or spurious pass-bands the filter is characterised in that a central hole (9) extends from the upper end of the inner conductor (6) of said at least one coaxial resonator through at least part of the length of the inner conductor, the central hole (9) forming a wave guide section, the cut-off frequency of which being above the pass-band of the band-pass filter, and in that the wave guide section contains in an upper portion (11) thereof a low loss dielectric material with a dielectric constant sufficiently high so that the cut-off frequency of the wave guide section is below the first higher order response of the band-pass filter, and in that the lower end portion (10) of the central hole (9) contains a lossy material.
Time: 7
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