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公开(公告)号：JP3577262B2
公开(公告)日：2004-10-13
申请号：JP2000206319
申请日：2000-07-07
Applicant: シャープ株式会社
CPC classification number: H01P1/20381 , H01P1/2013 , H01P1/2053
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公开(公告)号：JP2003087004A
公开(公告)日：2003-03-20
申请号：JP2001273882
申请日：2001-09-10
Applicant: TDK CORP
Inventor： ARUN CHANDRA KUNDYU
Abstract: PROBLEM TO BE SOLVED: To provide a miniaturized band-pass filter, ensuring a sufficient mechanical strength. SOLUTION: The filter comprises a dielectric block 2, composed of first parts belonging to a region extending from one section to another section parallel thereto and second and third parts divided by the first parts, and a metallization formed on the dielectric block 2 surface to form a cut-off waveguide 11 with the first parts and a first and second resonators 12, 13 with the second and third parts. The metallization includes excitation electrodes 8, 9 formed on the broadest side of the block 2. This makes possible attaining both the thinning and the broadening the band of the dielectric block at the same time. Thinning of the dielectric block reduces the radiation loss, to thereby obtain a high unloaded Q-value (Q0 ).
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公开(公告)号：JP2002353703A
公开(公告)日：2002-12-06
申请号：JP2001189080
申请日：2001-06-22
Applicant: TDK CORP
Inventor： ARUN CHANDRA KUNDYU
Abstract: PROBLEM TO BE SOLVED: To provide a highly compact and easily fabricated band pass filter. SOLUTION: The band pass filter employs a first half-wave (λ/2) resonator 2 having a first open end on which an input terminal is formed and a second open end opposite to the first open end, a second half-wave (λ/2) resonator 3 having a third open end on which an output terminal is formed and a fourth open end opposite to the third open end, and an evanescent waveguide 4 interposed between the second open end of the first resonator 2 and the fourth open end of the second resonator 3. The first half-wave (λ/2) resonator 2, the second half-wave (λ/2) resonator 3 and the evanescent waveguide 4 being single- unit. An air gap does not have to be formed by mounting components on a printed circuit board. Therefore, the overall size of the band pass filter can be miniaturized and fabrication of the band pass filter is simplified.
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公开(公告)号：JP2002185209A
公开(公告)日：2002-06-28
申请号：JP2000374859
申请日：2000-12-08
Applicant: TDK CORP
Inventor： ARUN CHANDRA KUNDYU
Abstract: PROBLEM TO BE SOLVED: To provide a band-pass filter the size of which is reduced while the filter secures a sufficient mechanical strength. SOLUTION: This band-pass filter has a dielectric block 2 that is substantially formed in a rectangular parallelepiped composed of a first portion belonging to an area from one cross section to another parallel cross section and second and third portions which are divided by the first portion, and metallized compositions formed on the surface of the block 2 to respectively form an interrupting waveguide 14 in the first portion and first and second resonators 15 and 16 in the second and third portions. The metallized compositions contain a capacitive electrode piece formed on the first surface of the dielectric block 2 which substantially intersects the cross sections at right angles.
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公开(公告)号：JP2002185207A
公开(公告)日：2002-06-28
申请号：JP2000380029
申请日：2000-12-14
Applicant: NIPPON DENGYO KOSAKU CO LTD
Inventor： HATANAKA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To make the amplitude deviation of a band-pass filter used for the method of OFDM modulation of, for example, W-CDMA for mobile communication and digital terrestrial television broadcasting in the passing band of the filter smaller than that in the conventional example. SOLUTION: In the band-pass filter provided with an input terminal, an output terminal, and a plurality of resonance elements cascade-connected between the terminals, an impedance transformer is installed to at least one of the input and output terminals. The input impedance Zin and output impedance Zout of the band-pass filter are adjusted to meet Zin
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Patent Agency Ranking
公开(公告)号：JP2001257503A
公开(公告)日：2001-09-21
申请号：JP2000068554
申请日：2000-03-13
Applicant: TDK CORP
Inventor： ARUN CHANDRA KUNDYU , ENDO KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a band pass filter using a TEM mode dielectric resonator which has good filtering performance and can be miniaturized. SOLUTION: This band pass filter is provided with dielectric resonators 40 and 41 including dielectric blocks 400 and 410 respectively having upper plans, a lower plane and four side faces and a waveguide combining part 42 of an evanescent E mode. Each of the resonators 40 and 41 has metallic layers 401, 411; 402, 412 coated respectively to the upper plane and the lower plane and metallic layers 403, 413 coated to one of the four side faces, the side surface coated with the layers 403 and 413 are made to be short-circuited surfaces and the other three side surfaces are made to be open surfaces so as to operate as a λ/4 dielectric resonator and to maintain the TEM mode. The part 42, which combines both of the resonators 40 and 41 by the TEM mode, has a cut-off frequency higher than that of each of them.
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公开(公告)号：JP2001028506A
公开(公告)日：2001-01-30
申请号：JP19923799
申请日：1999-07-13
Applicant: MURATA MANUFACTURING CO
Inventor： TSUJIGUCHI TATSUYA
Abstract: PROBLEM TO BE SOLVED: To prevent deterioration of a reflection characteristic and the increase of pass loss in a full frequency band, in the case of constructing a transmission line provided with a desired frequency characteristic by forming an electrode elimination pattern on a ground plane. SOLUTION: A conductor line 2 is formed on the upper face of a dielectric plate 1, a ground electrode 3 is formed on the lower face, and electrode non- forming parts 4 are also distributed with intervals (a) in the direction of signal propagation and with intervals (b) in a perpendicular direction to the signal propagation direction. Thus, transmission loss is increased in a frequency band defined by the intervals (a) to produce a band prevention type or low-pass type filter characteristic, and the attenuation quantity, etc., of the a prevention band is defined by the intervals (b) in the width direction.
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公开(公告)号：JP2000114804A
公开(公告)日：2000-04-21
申请号：JP28661998
申请日：1998-10-08
Applicant: MURATA MANUFACTURING CO
Inventor： ATOKAWA SUKEYUKI , YAMAMOTO TOSHIHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a miniaturized antenna sharing device and communication equipment device capable of efficiently removing the higher harmonic waves in a transmission signal generated by a transmission/reception changeover switch. SOLUTION: This antenna device is provided with a frequency variable filter 13 for switching transmission and reception bands through voltage controlled PIN diodes D1-D3 and a transmission/reception changeover switch 14 connected to an input/output terminal at one end of this frequency variable filter 13. The frequency variable filter 13 couples three stages of resonators 24-26 through coupling capacitors C4 and C5. An input/output terminal P1 of the frequency variable filter 13 is electrically connected through a π-shaped LC circuit (low-pass filter) composed of a coupling coil L5 and capacitors C6 and C7 to the resonator 24. An input/output terminal P2 is electrically connected through a π-shaped LC circuit (low-pass filter) composed of a coupling coil L6 and capacitors C8 and C9 to the resonator 26.
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公开(公告)号：JPH11340706A
公开(公告)日：1999-12-10
申请号：JP14895798
申请日：1998-05-29
Applicant: MATSUSHITA ELECTRIC IND CO LTD
Inventor： WADA KOJI , AWAI IKUO , ISHIZAKI TOSHIO
Abstract: PROBLEM TO BE SOLVED: To form attenuation poles as many as possible at an optional frequency. SOLUTION: This filter is provided with the N pieces (N is an integer >=2) of half wavelength resonators, an input terminal 3, and output terminal 4, a first matching means 5 for matching a first resonator and the input terminal, a second matching means 6 for matching an N-th resonator and the output terminal 4 and the (N-1) pieces of inter-stage connection means 7 for connecting the resonators. Then, the exciting positions of the first and N-th resonators are shifted from the center position of the resonators into one of end face directions and at least one or more inter-stage connection means 7 is electrically connected to a part other than both end parts of the resonators.
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270.发明专利
公开(公告)号：JPH11308008A
公开(公告)日：1999-11-05
申请号：JP11329798
申请日：1998-04-23
Applicant: MURATA MANUFACTURING CO
Inventor： MIKAMI SHIGEYUKI , HIRATSUKA TOSHIRO , SONODA TOMIYA , IDA YUTAKA , KANEKAWA KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To adjust the characteristics of a dielectric resonator device, without lowering no-load Q by mounting dielectric chips on a dielectric resonator part or between dielectric resonators adjacent to each other. SOLUTION: An electrode 1 with non-electrode forming parts 4a, 4b is formed on the upper surface of a dielectric plate 3 consisting of dielectric ceramics. An electrode with the non-electrode forming parts with the same shapes facing opposite each of the non-electrode forming parts 4a, 4b is formed on the lower surface of the dielectric plate 3. Thus, each of the non-electrode forming parts facing opposite each other are actuated as the dielectric resonator parts of a TE 010 mode. The resonance frequency of the dielectric resonators is, for example, in a 20 GHz zone. Each of the dielectric chips 21a, 21b, 21c, 21d, 21e with rectangular parallelepiped shapes are adhered and fixed at a prescribed position of the dielectric plate 3 by using, for example, an epoxy adhesive. Thus, the characteristics of the dielectric resonator device are adjusted by providing the dielectric chips 21a to 21e on the dielectric plate 3.
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