Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-07-09
1999-07-20
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343895, 343900, H01Q 124, H01Q 136
Patent
active
059261404
ABSTRACT:
An antenna for a portable radio unit includes a helical element, a rod-like whip element, a helical element power supply terminal, a whip element power supply terminal, a ground conductor, and a ground connection terminal. The helical element is arranged on a portable radio unit housing, and its diameter, pitch, and length are set in accordance with a carrier frequency having a wavelength .lambda.. The whip element is extended and stored by reciprocating inside a helical portion of the helical element, and is completely stored in the portable radio unit housing. The whip element has a length of .lambda./2. The helical element power supply terminal is connected to one end of the helical element to supply power only to it when the whip element is stored. The whip element power supply terminal is arranged at a predetermined position of the helical element to supply power to the whip element through the helical power supply terminal and the helical element when the whip element is extended. The ground conductor is arranged on a lower end portion of the whip element through an insulating portion. The ground connection terminal grounds the ground conductor when the whip element is extended.
REFERENCES:
patent: 4121218 (1978-10-01), Irwin et al.
patent: 5757325 (1998-05-01), Saldell
Japanese Office Action dated Sep. 8, 1998 with English language translation of Japanese Examiner's comments.
British Search Report, dated Sep. 26, 1997.
Malos Jennifer H.
NEC Corporation
Wong Don
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