US3731235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual polarized diplexer
Assignee: GTE Sylvania Inc
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Filing: 1971-11-03
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Granted: 1973-05-01
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Expires: 1991-11-03
Abstract
Abstract A microwave diplexer employs a section of circular waveguide having a transmit port coupled to two transmitters, an antenna port coupled to an antenna, and a receiver port including four openings symmetrically located around the periphery of the circular waveguide. Coupled to each receiver opening is a filter operative to improve the isolation between the receiver port and the transmit port for signals coming from the direction of the transmitter port. Two orthogonally related signals introduced at the transmit port are conducted along the circular waveguide to the antenna and are isolated from the receiver port by the impedance characteristics of the filters. Signals received via the antenna are isolated from the transmit port by a section of wave guide having a cutoff frequency above that of the received signal.
Inventors
- 👤 J Ditullio
- 👤 L Parad
- 👤 K Story
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:21
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2131; H01P1/16; H01P1/161
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A diplexer device comprising: electromagnetic wave conducting means having first, second and third ports and being adapted to conduct first and second signals from said second port to said first port, said first and second signals being in a first frequency band and being orthogonally polarized with respect to each other, to conduct third and fourth signals from said first port to said third port, and to separate said third and fourth signals at said third port, said third and fourth signals being in a second frequency band and being orthogonally polarized with respect to each other; first rejection means coupled to said second port and being adapted to reject said third and fourth signals; and second rejection means coupled to said third port and being adapted to reject said first and second signals at said third port.
Claim 2
Dependent Claim
138 words
A diplexer device comprising: electromagnetic wave conducting means having first, second and third ports and being adapted to conduct first and second signals from said second port to said first port, said first and second signals being in a first frequency band and being orthogonally polarized with respect to each other, to conduct third and fourth signals from said first port to said third port, and to separate said third and fourth signals at said third port, said third and fourth signals being in a second frequency band and being orthogonally polarized with respect to each other; first rejection means coupled to said second port and being adapted to reject said third and fourth signals; and second rejection means coupled to said third port and being adapted to reject said first and second signals at said third port.
Claim 3
Dependent Claim
80 words
A diplexer device according to claim 1 wherein said electromagnetic wave conducting means includes a first section of circular waveguide having an opening at one end corresponding to said first port, an opening at the other end corresponding to said second port and a pair of openings in the walls thereof corresponding to said third port, said pair of openings being circumferentially displaced from each other by a distance substantially equal to one-fourth of the circumference of said circular waveguide.
Claim 4
Dependent Claim
77 words
A diplexer according to claim 1 wherein said electromagnetic wave conducting means includes a first section of circular waveguide having an opening at one end corresponding to said first port, an opening at the other end corresponding to said second port, and four openings in the walls thereof corresponding to said third port, said four openings being symmetrically located around the circumference of said circular waveguide, said first section of circular waveguide having a first predetermined diameter.
Claim 5
Dependent Claim
81 words
A diplexer device according to claim 3 wherein said second rejection means includes a plurality of filters, each one coupled to a separate one of said four openings in the walls of said first section of circular waveguide, each of said filters being adapted to reflect a short circuit across its corresponding opening for said first and second signals in said first frequency band and to reflect a matched impedance to said third and fourth signals in said second frequency band.
Claim 6
Dependent Claim
108 words
A diplexer device according to claim 3 wherein said first rejection means includes: a second section of circular waveguide having an input end and an output end and having a second predetermined diameter smaller than the first predetermined diameter of said first section of circular waveguide and being adapted to cutoff signals having a frequency below the frequency band of said first aNd second signals; and impedance matching means coupled between said other end of said first section of circular waveguide and the output end of said second section of circular waveguide and being adapted to match the impedance between said first and second sections of circular waveguide.
Claim 7
Dependent Claim
61 words
A diplexer device according to claim 7 including coupling means having an output port connected to the input end of said second section of circular waveguide and first and second input ports and being adapted to convert signals in said first frequency band at its first and second input ports to a pair of orthogonally polarized signals at its output port.
Claim 8
Dependent Claim
44 words
A diplexer device according to claim 6 including a rotary joint coupled between the output port of said coupling means and the second port of said electromagnetic wave conducting means and being adapted to permit rotation of the polarization of said orthogonally polarized signals.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |