Communications: radio wave antennas – Antennas – Fractional – multiple – or full wave length linear type
Patent
1994-03-28
1995-05-30
Hajec, Donald
Communications: radio wave antennas
Antennas
Fractional, multiple, or full wave length linear type
343826, 343702, 343846, 343876, H01Q 124
Patent
active
054205999
ABSTRACT:
The invention provides for antenna apparatus having antenna members extending parallel to a ground plane, which members are L-shaped and can be provided in advantageously miniaturized form. Two such antenna members can be provided on the same ground plane so as to achieve antenna diversity and a switch mechanism is provided for switching between the antenna member in a receive mode, and for switching to only one of the antenna members for operation of the apparatus in a transmit mode. The switch mechanism is arranged to ground a feed connector of the antenna member that is not selected for transmission or reception so as to render that antenna member passive.
REFERENCES:
patent: 4040060 (1977-08-01), Kaloi
patent: 4083046 (1978-04-01), Kaloi
patent: 4395713 (1983-07-01), Nelson et al.
patent: 5268702 (1993-12-01), Amano et al.
Fujimoto et al., "Small Antennas", Published by Research Studies Press Ltd. of Letchworth, Hertfordshire, England, Printed by John Wiley & Sons Inc of New York, N.Y. pp. 116-151. No date.
Hirasawa et al, "Analysis, Design, and Measurement of Small and Low-Profile Antennas," Published by Artech House of Boston, Mass. (1992).
Kuboyama et al, "Experimental Results with Mobile Antennas Having Cross-Polarization Components in Urban and Rural Areas," IEEE Transactions on Vehicular Technology, vol. 39, No. 2, May 1990.
AT&T Global Information Solutions Company
Hajec Donald
Le Hoang-anh
Maginot Paul J.
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