Patent US4306200A successfully refreshed from Google Patents.
Patent US4085405A successfully refreshed from Google Patents.
US4085405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna matching network
Assignee: MHZ ENTERPRISES Inc
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Filing: 1976-11-09
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Granted: 1978-04-18
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Expires: 1996-11-09
Abstract
Abstract An antenna matching network for matching a citizens band radio transceiver to a standard automotive whip or windshield antenna utilizes a matching section for matching the nominal 50 ohm output of the citizens band transceiver to the generally lower impedance of the automotive antenna. A trap tuned to the citizens band prevents the output of the citizens band transmitter from damaging the automotive broadcast receiver when transmitting. The matching section is tunable over a sufficient range to match the citizens band transceiver to most automotive antennas, and a dual sensitivity indicator is utilized to aid the operator in tuning the matching network to provide optimum matching without the use of specialized equipment.
Inventors
- 👤 Edson L. Barlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:08
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3283; H03; H03H; H03H7/00; H03H7/38; H03H2007/386
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
280 words
A matching network for coupling a broadcast receiver and a communications transceiver having a transmitter and a receiver to a common automotive broadcast antenna, comprising: a tunable matching section including at least a series arm electrically connectable between the communications transceiver and the broadcast antenna; an indicator light electrically coupled to said series arm, said indicator light being responsive to the flow of power from said transceiver to said antenna and indicating the state of tune of said matching section; a blocking circuit connectable between said antenna and said broadcast receiver, said blocking circuit being operative to attenuate the flow of signals having frequencies within the operating frequency range of said transmitter while permitting the flow of broadcast signals from said antenna to said broadcast receiver; a housing surrounding said matching network and means extending from said housing for disconnectably electrically connecting said matching network to said broadcast antenna, said broadcast receiver and to said transceiver, said indicator light being affixed to said housing in a manner rendering it visible from outside of said housing and said matching section being tunable from outside of said housing; a sensitivity switch electrically coupled to said indicator light, said sensitivity switch being operative from outside of said housing to increase the sensitivity of said indicator light to the flow of power between said transceiver and said antenna to thereby increase the brightness of said indicator light; and a first capacitor coupling said matching network to said indicator light and a second capacitor coupled to said sensitivity switch, said sensitivity switch being operative to connect said second capacitor in a parallel circuit with said first capacitor to increase the sensitivity of said indicator light.
Claim 2
Dependent Claim
280 words
A matching network for coupling a broadcast receiver and a communications transceiver having a transmitter and a receiver to a common automotive broadcast antenna, comprising: a tunable matching section including at least a series arm electrically connectable between the communications transceiver and the broadcast antenna; an indicator light electrically coupled to said series arm, said indicator light being responsive to the flow of power from said transceiver to said antenna and indicating the state of tune of said matching section; a blocking circuit connectable between said antenna and said broadcast receiver, said blocking circuit being operative to attenuate the flow of signals having frequencies within the operating frequency range of said transmitter while permitting the flow of broadcast signals from said antenna to said broadcast receiver; a housing surrounding said matching network and means extending from said housing for disconnectably electrically connecting said matching network to said broadcast antenna, said broadcast receiver and to said transceiver, said indicator light being affixed to said housing in a manner rendering it visible from outside of said housing and said matching section being tunable from outside of said housing; a sensitivity switch electrically coupled to said indicator light, said sensitivity switch being operative from outside of said housing to increase the sensitivity of said indicator light to the flow of power between said transceiver and said antenna to thereby increase the brightness of said indicator light; and a first capacitor coupling said matching network to said indicator light and a second capacitor coupled to said sensitivity switch, said sensitivity switch being operative to connect said second capacitor in a parallel circuit with said first capacitor to increase the sensitivity of said indicator light.
Claim 3
Dependent Claim
40 words
A matching network as recited in claim 1 wherein said matching section is an L-section having a series arm and a shunt arm, and wherein said indicator light is electrically coupled across at least a portion of said series arm.
Claim 4
Dependent Claim
79 words
A matching network as recited in claim 2 wherein said blocking circuit includes a parallel tuned circuit tuned to the range of frequencies transmitted by said transceiver connectable between said broadcast receiver and said antenna, and a series tuned circuit tuned to the range of frequencies transmitted by said communications transceiver connectable to said broadcast receiver, said series tuned circuit shunting signals having frequencies in the range of transmission of said citizens band transceiver away from said broadcast receiver.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |