Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1988-11-02
1989-09-19
Carroll, J.
Communications: radio wave antennas
Antennas
With radio cabinet
343895, 343900, H01Q 124
Patent
active
048685763
ABSTRACT:
An antenna for a portable cellular telephone includes a quarter-wavelength ground radiator and a helical coil capacitively coupled to an extendable half-wavelength radiator. The extendable half-wavelength radiator includes a metallic coil molded in plastic. The ground radiator includes a serpentined transmission line on a flexible circuit board. The helical coil and ground radiator are coupled by a transmission line to a duplexer. The duplexer couples transmitter signals from a radio transmitter to the antenna and receiver signals from the antenna to a radio receiver. The antenna may be advantageously utilized in any portable radio applications where small size and immunity to hand induced radiation losses are desired.
REFERENCES:
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4571595 (1986-02-01), Phillips et al.
patent: 4700194 (1987-10-01), Ogawa et al.
patent: 4723305 (1988-02-01), Phillips et al.
patent: 4725845 (1988-02-01), Phillips
patent: 4740794 (1988-04-01), Phillips et al.
"Dynatac Cellular Portable Telephones", published by and available from C & E Parts of Motorola, Inc.
Carroll J.
Hackbart Rolland R.
Johnson Doris J.
Motorola Inc.
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