Electrical device and electrical transmitter-receiver particular

Details Electrical device and electrical transmitter-receiver particular Electrical device and electrical transmitter-receiver particular

1990-07-19

1993-04-20

Hille, Rolf

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343900, H01Q 124

Patent

active

052046877

ABSTRACT:
An electrical transmitter-receiver, particularly useful as a CT2 cordless telephone, includes a quarter wavelength antenna rod carried by the housing, and a quarter wavelength antenna coil carried by one end of the antenna rod. The antenna rod is movably mounted through an opening in its housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing. When the antenna rod is in its retracted position an electrical switch connects the antenna coil to the electrical circuit, and when the antenna rod is in its extended position an electrical switch connects the antenna rod to the electrical circuit.

REFERENCES:
patent: 3087117 (1963-04-01), Mitchell
patent: 4095229 (1978-06-01), Elliott
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4190841 (1980-02-01), Harada
patent: 4598295 (1986-07-01), Murphy
patent: 4725845 (1988-02-01), Phillips
patent: 4860024 (1989-08-01), Egashira
patent: 4862182 (1989-08-01), Egashira
patent: 4890114 (1989-12-01), Egashira
patent: 4958382 (1990-09-01), Imanishi
Patent Abstracts of Japan No. 13507 (E-485) Nov. 14, 1989 & JP-A-1204504 (Fujitsu).
Patent Abstracts of Japan No. 6215 (E-138) Oct. 28, 1982 & JP-A-57118403 (Zeneraru Research).

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