Title:
FILTER CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/130570
Kind Code:
A1
Abstract:
A filter circuit (1) comprises: a first transmission line (11); a second transmission line (12) having an electrical length set to 1/2 times the electrical length of the first transmission line; a first capacitor (21); a second capacitor (22); and a third capacitor (23). The capacitances of the first capacitor, the second capacitor and the third capacitor are set so that a circuit consisting of the first transmission line, the second transmission line and the first capacitor resonates in series at a prescribed basic frequency, a circuit consisting of the first transmission line, the first capacitor, and the second capacitor resonates in parallel at a triple frequency which is three times the basic frequency, and a circuit consisting of the second transmission line and the third capacitor resonates in series at the triple frequency.
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Inventors:
YAMAGUCHI YO (JP)
Application Number:
PCT/JP2020/047174
Publication Date:
June 23, 2022
Filing Date:
December 17, 2020
Export Citation:
Assignee:
FUJIKURA LTD (JP)
International Classes:
H01P1/203; H01P1/212
Foreign References:
| JP2004135257A | 2004-04-30 | |||
| JPH11205007A | 1999-07-30 | |||
| JPH1131903A | 1999-02-02 | |||
| JPH03136401A | 1991-06-11 |
Other References:
YAMAGUCHI, YO ET AL.: "A Frequency Doubler MMIC with a Small 2-Band Elimination Filter", IEEE COMPOUND SEMICONDUCTOR INTERGRATED CIRCUIT SYMPOSIUM 2004, 24 October 2004 (2004-10-24), pages 268 - 271, XP010767489
YO YAMAGUCHI, TADAO NAKAGAWA, KATSUHIKO ARAKI: "C-2-25 An X-band frequency doubler with 2-band elimination filter", IEICE ELECTRONICS SOCIETY CONFERENCE; NIIGATA, JAPAN; SEPTEMBER 23-26, 2003, vol. 1, 31 August 2003 (2003-08-31) - 26 September 2003 (2003-09-26), JP, pages 49, XP009538596, ISSN: 1349-1407
YAMAGUCHI, YO; KAWASHIMA, MUNENARI; NAKAGAWA, TADAO; ARAKI, KATSUHIKO: "C-2-50 A miniature monolithic filter for a quadrupler", ELECTRONICS SOCIETY CONFERENCE OF IEICE ; MIYAZAKI, JAPAN; SEPTEMBER 10-13, 2002, vol. 1, 31 July 2002 (2002-07-31) - 13 September 2002 (2002-09-13), pages 72, XP009538595
See also references of EP 4044360A4
YO YAMAGUCHI, TADAO NAKAGAWA, KATSUHIKO ARAKI: "C-2-25 An X-band frequency doubler with 2-band elimination filter", IEICE ELECTRONICS SOCIETY CONFERENCE; NIIGATA, JAPAN; SEPTEMBER 23-26, 2003, vol. 1, 31 August 2003 (2003-08-31) - 26 September 2003 (2003-09-26), JP, pages 49, XP009538596, ISSN: 1349-1407
YAMAGUCHI, YO; KAWASHIMA, MUNENARI; NAKAGAWA, TADAO; ARAKI, KATSUHIKO: "C-2-50 A miniature monolithic filter for a quadrupler", ELECTRONICS SOCIETY CONFERENCE OF IEICE ; MIYAZAKI, JAPAN; SEPTEMBER 10-13, 2002, vol. 1, 31 July 2002 (2002-07-31) - 13 September 2002 (2002-09-13), pages 72, XP009538595
See also references of EP 4044360A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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