EP0367609A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved extendable antenna for portable cellular telephones
Assignee: Motorola Solutions Inc
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Filing: 1989-11-02
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Granted: —
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Expires: 2009-11-02
Abstract
Abstract An antenna for a portable cellular telephone (100) includes a quarter-wavelength ground radiator (106) and a helical coil (104) capacitively coupled to an extendable half-wavelength radiator (102). The extendable half-wavelength radiator (102) includes a metallic coil (209) molded in plastic. The ground radiator (106) includes a serpentined transmission line (302) on a flexible circuit board (310). The helical coil (104) and ground radiator (106) are coupled by a transmission line (110) to a duplexer (112). The duplexer couples transmitter signals from a radio transmitter (114) to the antenna and receiver signals from the antenna to a radio receiver (116). The antenna may be advantageously utilized in any portable radio applications where small size and immunity to hand induced radiation losses are desired.
Inventors
- 👤 Robert Michael Johnson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:38
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q21/00; H01Q21/28; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/244; H01Q1/36; H01Q9/00; H01Q9/04; H01Q9/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
An extendable antenna system for a portable radio transceiver enclosed in housing means (120,121,122) having top and bottom portions, the bottom portion (122) of the housing means having a conductive surface; said extendable antenna system CHARACTERIZED BY: helical antenna means (104) disposed in the top portion (121) of the housing means and including a helical winding having a first end coupled to the transceiver and having a second end; extendable half-wavelength radiating means (102) having non-conductive top and bottom portions (206,210) and a conductive center portion (208) and extending through said helical winding, the conductive portion of said extendable half-wavelength radiating means being capacitively coupled to the second end of said helical winding when extended from the top portion of the housing means and being substantially decoupled therefrom when retracted into the bottom portion of the housing means; and quarter-wavelength radiating means (106) disposed in the top portion (120) of the housing means substantially at right angles with respect to said helical antenna means and coupled to the transceiver ground and the conductive surface of the housing means.
Claim 2
Dependent Claim
178 words
An extendable antenna system for a portable radio transceiver enclosed in housing means (120,121,122) having top and bottom portions, the bottom portion (122) of the housing means having a conductive surface; said extendable antenna system CHARACTERIZED BY: helical antenna means (104) disposed in the top portion (121) of the housing means and including a helical winding having a first end coupled to the transceiver and having a second end; extendable half-wavelength radiating means (102) having non-conductive top and bottom portions (206,210) and a conductive center portion (208) and extending through said helical winding, the conductive portion of said extendable half-wavelength radiating means being capacitively coupled to the second end of said helical winding when extended from the top portion of the housing means and being substantially decoupled therefrom when retracted into the bottom portion of the housing means; and quarter-wavelength radiating means (106) disposed in the top portion (120) of the housing means substantially at right angles with respect to said helical antenna means and coupled to the transceiver ground and the conductive surface of the housing means.
Claim 3
Dependent Claim
35 words
The extendable antenna system according to claim 1, CHARACTERIZED IN THAT the conductive center portion (208) of said extendable half-wavelength radiating means is comprised of a coiled spring (209) having a predetermined number of coils.
Claim 4
Dependent Claim
39 words
The extendable antenna system according to claim 2, CHARACTERIZED IN THAT said top and bottom portions (206,210) of said extendable half-wavelength radiating means are plastic and said coiled spring (209) of said half-wavelength radiating means is enclosed in plastic.
Claim 5
Dependent Claim
30 words
The extendable antenna system according to claim 1, CHARACERIZED IN THAT said quarter-wavelength radiating means (106) is comprising of a metallic conductor (302) bonded to a flexible substrate means (310).
Claim 6
Dependent Claim
24 words
The extendable antenna system according to claim 4, CHARACTERIZED IN THAT said metallic conductor (302) of said quarter-wavelength radiating means has a serpentined pattern.
Claim 7
Dependent Claim
85 words
A portable radio comprising; transmitter means (114); receiver means (116); transmission line means (110) having first and second ends; duplexing means (112) for coupling said transmitter means and said receiver means to the first end of said transmission line means; housing means (120,121,122) having top and bottom portions, the bottom portion (122) of said housing means having a conductive surface for enclosing said transmitter means, said receiver means and said duplexing means; and an extendable antenna system according to any one of the preceding claims
References Cited (Backward Citations)
No citation records indexed.
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