US4185257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quasioptical band rejection filter
Assignee: NTT Inc
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Filing: 1978-06-01
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Granted: 1980-01-22
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Expires: 1998-06-01
Abstract
Abstract One of ports of a 3dB hybrid for dividing and combining electromagnetic waves is used as an input port, and first and second resonators are electromagnetically coupled respectively with two ports to which the electromagnetic waves incident from the input port are outputted after being divided. The first and second resonators respectively comprise pluralities of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and first and second reflectors disposed opposite the coupling disks farthest from the hybrid. The numbers of coupling disks of the first and second resonators are selected to differ by one. The remaining port of the hybrid is used as an output port.
Inventors
- 👤 Nobuo Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:58
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2138
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A quasioptical band rejection filter comprising: a 3dB hybrid for dividing and combining electromagnetic waves, one of ports of the hybrid being used as an input port; a first resonator electromagnetically coupled with one of two ports of this hybrid to which the electromagnetic waves incident from the input port are outputted after being divided, the first resonator comprising a plurality of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and a first reflector disposed opposite the last one of the coupling disks; and a second resonator electromagnetically coupled with the other output port and comprising a plurality of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and a second reflector disposed opposite the last one of the coupling disks, the number of coupling disks of the second resonator being larger than that of the first resonator by one; the remaining port of the hybrid being used as an output port.
Claim 2
Dependent Claim
163 words
A quasioptical band rejection filter comprising: a 3dB hybrid for dividing and combining electromagnetic waves, one of ports of the hybrid being used as an input port; a first resonator electromagnetically coupled with one of two ports of this hybrid to which the electromagnetic waves incident from the input port are outputted after being divided, the first resonator comprising a plurality of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and a first reflector disposed opposite the last one of the coupling disks; and a second resonator electromagnetically coupled with the other output port and comprising a plurality of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and a second reflector disposed opposite the last one of the coupling disks, the number of coupling disks of the second resonator being larger than that of the first resonator by one; the remaining port of the hybrid being used as an output port.
Claim 3
Dependent Claim
77 words
A quasioptical band rejection filter according to claim 1, wherein the 3 dB hybrid is formed in the intersection of oversized waveguides coupled to cross each other at right angles, wherein the pluralities of coupling disks are respectively inserted and held in the oversized waveguides on one side of the hybrid, and wherein the end faces of the oversized waveguides on the sides of the coupling disks being inserted are short-circuited with first and second reflectors, respectively.
Claim 4
Dependent Claim
26 words
A quasioptical band rejection filter according to claim 1, wherein the hybrid and the first and second resonators are constructed for use in the beam mode.
Claim 5
Dependent Claim
32 words
A quasioptical band rejection filter according to claim 1, wherein the hybrid is formed with a half mirror which reflects one half of the incident waves and passes therethrough the other half.
Claim 6
Dependent Claim
16 words
A quasioptical band rejection filter according to claim 1, wherein the coupling disks are dielectric disks.
Claim 7
Dependent Claim
28 words
A quasioptical band rejection filter according to claim 1, wherein the distances between the first and second resonators and the hybrid are selected to be substantially the same.
Claim 8
Dependent Claim
38 words
A quasioptical band rejection filter according to claim 1, wherein the spacing between adjacent ones of the coupling disks is selected to be an integral multiple of 1/2 the wavelength of a center frequency of a stop band.
References Cited (Backward Citations)
DE2108687A1
Cited
US4034315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |