US4501018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplex transceiver employing a common piezoelectric element for transmitting and receiving
Assignee: Motorola Solutions Inc
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Filing: 1983-07-05
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Granted: 1985-02-19
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Expires: 2003-07-05
Abstract
Abstract A radio frequency transceiver is provided in which the crystal resonator and monolithic crystal filter devices therein all operate at or near the operating frequency of the transceiver, and which employs a single piezoelectric element to achieve the functions of receiver signal filtering, transmitter signal filtering, receiver local oscillator signal generation, and transmitter local oscillator signal generation. To achieve these functions, a crystal resonator and a monolithic crystal filter are situated on the same substrate of piezoelectric material. The crystal resonator portion of the piezoelectric device is employed to control the frequency at which a local oscillator generates radio frequency energy. Such crystal controlled local oscillator is shared by a receiver mixer circuit and a transmitter mixer circuit. Switching circuitry is employed to switch the crystal filter portion of the piezoelectric device from the receiver signal path to the transmitter signal path.
Inventors
- 👤 Charles W. Shanley
- 👤 William V. Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:19
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/44
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
127 words
A radio frequency transceiver comprising: radio frequency receiver means for receiving input signals at a first predetermined frequency; radio frequency transmitter means for generating output signals at said first predetermined frequency; oscillator means, coupled to each of said transmitter means and said receiver means, for generating signals which control the frequency on which said receiver means receives and said transmitter means transmits; piezoelectric resonator means, coupled to said oscillator means, for controlling the frequency of the signals generated thereby; piezoelectric filter means, selectively coupled to said receiver and transmitter means, for filtering input signals provided to said receiver means and for filtering output signals generated by said transmitter means, said piezoelectric resonator means and said piezoelectic filter means each operating at or near said first predetermined frequency.
Claim 2
Dependent Claim
127 words
A radio frequency transceiver comprising: radio frequency receiver means for receiving input signals at a first predetermined frequency; radio frequency transmitter means for generating output signals at said first predetermined frequency; oscillator means, coupled to each of said transmitter means and said receiver means, for generating signals which control the frequency on which said receiver means receives and said transmitter means transmits; piezoelectric resonator means, coupled to said oscillator means, for controlling the frequency of the signals generated thereby; piezoelectric filter means, selectively coupled to said receiver and transmitter means, for filtering input signals provided to said receiver means and for filtering output signals generated by said transmitter means, said piezoelectric resonator means and said piezoelectic filter means each operating at or near said first predetermined frequency.
Claim 3
Dependent Claim
40 words
The transceiver of claim 1 including first switching means for coupling said filter means to said receiver means when input signal reception is desired and for coupling said filter means to said transmitter means when output signal transmission is desired.
Claim 4
Dependent Claim
38 words
The transceiver of claim 2 including first signal amplifying means, selectively coupled to said filter means, for amplifying said input signals, and including second signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 5
Dependent Claim
42 words
The transceiver of claim 3 including second switching means for coupling said first amplifying means to said filter means when input signal reception is desired and for coupling said second amplifying means to said filter means when output signal transmission is desired.
Claim 6
Dependent Claim
17 words
The transceiver of claim 4 including an antenna selectively coupled to said first and second amplifying means.
Claim 7
Dependent Claim
39 words
The transceiver of claim 5 including third switching means for coupling said antenna to first amplifying means when input signal reception is desired and for coupling said antenna to said second amplifying means when output signal transmission is desired.
Claim 8
Dependent Claim
20 words
The transceiver of claim 1 including signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 9
Dependent Claim
14 words
The transceiver of claim 1 including an antenna operatively coupled to said filter means.
Claim 10
Dependent Claim
21 words
The transceiver of claim 1 including first signal amplifying means, selectively coupled to said filter means, for amplifying said input signals.
Claim 11
Dependent Claim
21 words
The transceiver of claim 9 including second signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 12
Dependent Claim
17 words
The transceiver of claim 1 wherein said first predetermined frequency is at least equal to 130 MHz.
Claim 13
Dependent Claim
145 words
A radio frequency transceiver comprising: radio frequency receiver means for receiving input signals at a first predetermined frequency; radio frequency transmitter means for generating output signals at said first predetermined frequency; oscillator means, coupled to each of said transmitter means and said receiver means, for generating signals which control the frequency on which said receiver means receives and said transmitter means transmits; piezoelectric resonator means, coupled to said oscillator means, for controlling the frequency of the signals generated thereby; piezoelectric filter means, selectively coupled to said receiver and transmitter means, for filtering input signals provided to said receiver means and for filtering output signals generated by said transmitter means, said piezoelectric resonator means and said piezoelectic filter means being situated on a common substrate of piezoelectric material, said piezoelectric resonator means and said piezoelectric filter means each operating at or near said first predetermined frequency.
Claim 14
Dependent Claim
145 words
A radio frequency transceiver comprising: radio frequency receiver means for receiving input signals at a first predetermined frequency; radio frequency transmitter means for generating output signals at said first predetermined frequency; oscillator means, coupled to each of said transmitter means and said receiver means, for generating signals which control the frequency on which said receiver means receives and said transmitter means transmits; piezoelectric resonator means, coupled to said oscillator means, for controlling the frequency of the signals generated thereby; piezoelectric filter means, selectively coupled to said receiver and transmitter means, for filtering input signals provided to said receiver means and for filtering output signals generated by said transmitter means, said piezoelectric resonator means and said piezoelectic filter means being situated on a common substrate of piezoelectric material, said piezoelectric resonator means and said piezoelectric filter means each operating at or near said first predetermined frequency.
Claim 15
Dependent Claim
40 words
The transceiver of claim 12 including first switching means for coupling said filter means to said receiver means when input signal reception is desired and for coupling said filter means to said transmitter means when output signal transmission is desired.
Claim 16
Dependent Claim
38 words
The transceiver of claim 13 including first signal amplifying means, selectively coupled to said filter means, for amplifying said input signals, and including second signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 17
Dependent Claim
42 words
The transceiver of claim 14 including second switching means for coupling said first amplifying means to said filter means when input signal reception is desired and for coupling said second amplifying means to said filter means when output signal transmission is desired.
Claim 18
Dependent Claim
17 words
The transceiver of claim 15 including an antenna selectively coupled to said first and second amplifying means.
Claim 19
Dependent Claim
39 words
The transceiver of claim 16 including third switching means for coupling said antenna to first amplifying means when input signal reception is desired and for coupling said antenna to said second amplifying means when output signal transmission is desired.
Claim 20
Dependent Claim
20 words
The transceiver of claim 12 including signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 21
Dependent Claim
14 words
The transceiver of claim 12 including an antenna operatively coupled to said filter means.
Claim 22
Dependent Claim
21 words
The transceiver of claim 12 including first signal amplifying means, selectively coupled to said filter means, for amplifying said input signals.
Claim 23
Dependent Claim
21 words
The transceiver of claim 20 including second signal amplifying means, selectively coupled to said filter means, for amplifying said output signals.
Claim 24
Dependent Claim
17 words
The transceiver of claim 12 wherein said first predetermined frequency is at least equal to 130 MHz.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |