Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1993-09-23
1995-05-02
Hajec, Donald
Communications: radio wave antennas
Antennas
With radio cabinet
343901, 343895, H01Q 124, H01Q 1108
Patent
active
054123925
ABSTRACT:
A dielectric plate 21 can be mounted on a housing 11 in such a manner that it is slidably retracted into the housing. A strip antenna element of an electrical length approximately equal to a quarter wavelength is formed on one side of the dielectric plate along one marginal edge thereof, and an antenna element 23 composed of a straight conductor portion 23a and a coil 23b connected at one end thereto is formed on the dielectric plate 21 just above the strip antenna element 22. The electrical length of the antenna element 23 is also equal to a quarter wavelength. A parallel twin-lead type feeder of a length nearly equal to the quarter wavelength is also formed on the dielectric plate 21 in parallel to the strip antenna element 22. The feeder 26 is connected at one end to inner ends of the antenna elements 22 and 23 and at the other end to a feeder 27 via contact pieces 29a and 29b. The feeder 27 is connected directly to a radio circuit 12 in the housing 11. When the dielectric plate 21 is at its fully retracted position in the housing 11, the contact piece 29b of the plus line 27b of the feeder 27 is in contact with the straight conductor portion 23a and the contact piece 29a of the minus line 27a is out of contact with the antenna element 22. The housing 11 is made of a conductive material.
REFERENCES:
patent: 3656167 (1972-04-01), Lea
patent: 4138681 (1979-02-01), Davidson et al.
patent: 4313119 (1982-01-01), Garay et al.
patent: 4847629 (1989-07-01), Shimazaki
patent: 5177492 (1993-01-01), Tomura et al.
patent: 5204687 (1993-04-01), Elliott et al.
"Built-In Antenna for Portable Telephone Set", by K. Yasuhiro, Pat. Abstr. of Japan, vol. 17, No. 264 (E 1370), May 24, 1993.
"Antenna System", by K. Kenichi et al., Pat. Abstr. of Japan, vol. 16, No. 379, (E1247), Aug. 13, 1992.
"Variable Length Whip Antenna", by Y. Isogai, Pat. Abstr. of Japan, vol. 9, No. 244 (E346)(1967), Sep. 30, 1985.
Hajec Donald
Le Hoang-anh
NTT Mobile Communications Network Inc.
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