US3914713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave circuits constructed inside a waveguide
Assignee: Japan Broadcasting Corp
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Filing: 1973-05-18
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Granted: 1975-10-21
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Expires: 1993-05-18
Abstract
Abstract By inserting a rectangular conductive flat member into a waveguide in contact relation of their edge portions to the waveguide walls in parallel with an electric field therein, cutoff frequencies at portions of the waveguide to which the conductive flat member is inserted become higher to form a cutoff region. The conductive flat member is composed of a conductor plate or by evaporating a conductive thick film on a dielectric or magnetic plate. The conductive flat member occasionally lined with a non-conductive flat member is provided with circuit elements such as slots formed by punching and strip lines or semiconductor diodes formed by evaporation, and microwave circuits having various functions such as filter circuits, directional couplers, oscillator circuits, frequency converter circuits, frequency multiplier circuits, switch circuits, phase shifter circuits, etc. are constructed on the conductive flat member by combination of the circuit elements through mutual coupling therebetween. These microwave circuits are coupled to transmission regions of the waveguide adjoining both sides of the cut-off region by circuit elements located at the end portion of the conductive flat member. Accordingly, only by inserting into the waveguide a conductive flat member on which various circuit elements are provided, desired microwave circuits of various kinds are constructed very easily inside the waveguide. Such microwave circuits are small in size and low in transmission loss due to elimination of waveguide converters conventionally used, and are suitable for massproduction due to simplicity of structure and ease of manufacturing and assembling which results from mechanical working technique of high degree being unnecessary.
Inventors
- 👤 Yoshihiro Konishi
- 👤 Kenichi Konno
- 👤 Norihiko Yazawa
- 👤 Norio Hoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/181; H01P5/182; H01P1/00; H01P1/18; H01P1/185; H01P1/20; H01P1/207; H01P1/32; H01P1/38; H01P5/04; H03; H03B; H03B19/00; H03B19/16; H03B19/18; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D9/0641; H03D7/00; H03D7/02; H03D9/0616
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band pass filter both by coupling said circuit elements between each other and by coupling between said circuit elemenTs and a transmission region of the waveguide, the circuit elements coupled to the transmission region of the waveguide comprising image-type slot lines.
Claim 2
Dependent Claim
93 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band pass filter both by coupling said circuit elements between each other and by coupling between said circuit elemenTs and a transmission region of the waveguide, the circuit elements coupled to the transmission region of the waveguide comprising image-type slot lines.
Claim 3
Dependent Claim
93 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, a plurality of said circuit elements comprising any of half-wavelength resonators and image-type slot lines.
Claim 4
Dependent Claim
93 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, a plurality of said circuit elements comprising any of half-wavelength resonators and image-type slot lines.
Claim 5
Dependent Claim
95 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, the circuit elements which are coupled to said transmission region of the waveguide comprising image-type slot lines.
Claim 6
Dependent Claim
95 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, the circuit elements which are coupled to said transmission region of the waveguide comprising image-type slot lines.
Claim 7
Dependent Claim
91 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flalt member including a plurality of planar circuit elements wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide to provide desired functions, and wherein said single conductive flat member is slant shaped to form an opening of an image-type slot line.
Claim 8
Dependent Claim
91 words
A microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flalt member including a plurality of planar circuit elements wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide to provide desired functions, and wherein said single conductive flat member is slant shaped to form an opening of an image-type slot line.
Claim 9
Dependent Claim
85 words
A microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band pass filter by both couplings, said circuit elements coupled to said transmission region including image-type slot lines.
Claim 10
Dependent Claim
85 words
A microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band pass filter by both couplings, said circuit elements coupled to said transmission region including image-type slot lines.
Claim 11
Dependent Claim
85 words
A microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band elimination filter by both couplings, said circuit elements coupled to said transmission region including image-type slot lines.
Claim 12
Dependent Claim
85 words
A microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band elimination filter by both couplings, said circuit elements coupled to said transmission region including image-type slot lines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |