US4361905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for connecting selected antennas to a radio for transmitting and receiving
Assignee: Ericsson Inc
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Filing: 1980-11-10
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Granted: 1982-11-30
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Expires: 2000-11-10
Abstract
Abstract A single terminal for a radio transmitter and receiver is connected to a first antenna for transmitting, and simultaneously to the first antenna or a second antenna for receiving. The connection is provided by a three port circulator having a first port connected to the first antenna, a second port connected through a quarter wavelength transmission line to a PIN diode and the second antenna, and a third port connected to the radio terminal. The radio transmitter is normally connected to the first antenna through the circulator, and the first or the second antenna is selectively and simultaneously connected to the radio receiver depending upon the conductive condition of the PIN diode.
Inventors
- 👤 Ralph Etherington
- 👤 Joe B. Linker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:27
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
An improved arrangement for selectively coupling first and second antenna terminals to a single radio terminal, comprising: a. a circulator having first, second, and third terminals and arranged so that energy applied to said first terminal becomes available at said second terminal, that energy applied to said second terminal becomes available at said third terminal, and that energy applied to said third terminal becomes available at said first terminal; b. means coupling said first circulator terminal to said first antenna terminal; c. means coupling said third circulator terminal to said radio terminal; d. a transmission line having a length that is an odd multiple, including unity, of a quarter wavelength at a selected radio frequency; e. means coupling a first end of said transmission line to said second circulator terminal; f. means coupled to a second end of said transmission line for selectively applying a very low or very high impedance thereto; g. and means coupling said second end of said transmission line to said second antenna terminal.
Claim 2
Dependent Claim
168 words
An improved arrangement for selectively coupling first and second antenna terminals to a single radio terminal, comprising: a. a circulator having first, second, and third terminals and arranged so that energy applied to said first terminal becomes available at said second terminal, that energy applied to said second terminal becomes available at said third terminal, and that energy applied to said third terminal becomes available at said first terminal; b. means coupling said first circulator terminal to said first antenna terminal; c. means coupling said third circulator terminal to said radio terminal; d. a transmission line having a length that is an odd multiple, including unity, of a quarter wavelength at a selected radio frequency; e. means coupling a first end of said transmission line to said second circulator terminal; f. means coupled to a second end of said transmission line for selectively applying a very low or very high impedance thereto; g. and means coupling said second end of said transmission line to said second antenna terminal.
Claim 3
Dependent Claim
34 words
The improved arrangement of claim 1 wherein said means for selectively applying low or high impedance comprises a PIN diode connected to a point of reference potential, and means for biasing said PIN diode.
Claim 4
Dependent Claim
20 words
The improved arrangement of claim 1 or claim 2 and further comprising a duplexer connected to said single radio terminal.
Claim 5
Dependent Claim
123 words
An improved arrangement for selectively coupling a single terminal associated with a radio transmitter and receiver to first and second antennas comprising: a. a circulator coupled to said single terminal and to said first antenna terminal for applying signals from said radio transmitter to said first antenna; b. and control means coupled to said circulator and to said second antenna for selectively causing signals from said first antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna, and for alternatively and selectively causing signals from said second antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna.
Claim 6
Dependent Claim
123 words
An improved arrangement for selectively coupling a single terminal associated with a radio transmitter and receiver to first and second antennas comprising: a. a circulator coupled to said single terminal and to said first antenna terminal for applying signals from said radio transmitter to said first antenna; b. and control means coupled to said circulator and to said second antenna for selectively causing signals from said first antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna, and for alternatively and selectively causing signals from said second antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna.
Claim 7
Dependent Claim
67 words
The improved arrangement of claim 4 wherein said control means reflect signals received by said circulator from said first antenna to said single terminal for receiving and short circuit signals from said second antenna, and alternatively pass signals received by said circulator from said first antenna to said second antenna and pass signals received by said circulator from said second antenna to said single terminal for receiving.
Claim 8
Dependent Claim
24 words
The improved arrangement of claim 4 or claim 5 wherein said circulator applies signals for transmission from said single terminal to said first antenna.
Claim 9
Dependent Claim
29 words
The improved arrangement of claim 4 or claim 5 and further comprising a duplexer connected to said single terminal, and a radio transmitter and receiver connected to said duplexer.
Claim 10
Dependent Claim
26 words
The improved arrangement of claim 6 and further comprising a duplexer connected to said single terminal, and a radio transmitter and receiver connected to said duplexer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |