Window mounted antenna for a cellular mobile telephone

Details Window mounted antenna for a cellular mobile telephone Window mounted antenna for a cellular mobile telephone

1988-05-16

1990-06-05

Hille, Rolf

Communications: radio wave antennas

Antennas

With vehicle

343713, 343900, H01Q 132

Patent

active

049318063

ABSTRACT:
A window-mounted cellular mobile telephone antenna includes an outside module for mounting on the outside surface of a vehicle window in registration with an inside module mounted on the inside surface of the window. The outside module includes a capacitive coupling element and a generally vertical radiating element not less than 5/8 wavelength at the antenna operating frequency. The inside module includes a self-contained electrical circuit forming a ground-plane for the radiating element, an inductor for matching the impedance of the radiating element to that of a coaxial feedline, and a capacitive coupling element interacting with the coupling element of the outside module and the dielectric of the window glass to form a coupling capacitor. The length of the radiating element may be increased beyond 5/8 wavelength to reduce impedance matching requirements in the inside module.

REFERENCES:
patent: 4238799 (1980-12-01), Parfitt
patent: 4621243 (1986-11-01), Harada
patent: 4779098 (1988-10-01), Blaese
patent: 4785305 (1988-11-01), Shyu
patent: 4794319 (1988-12-01), Shimazaki

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