Communications: radio wave antennas – Antennas – Microstrip
Patent
1992-11-30
2000-05-09
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
343702, 343841, H01Q 124, H01Q 138
Patent
active
060610247
ABSTRACT:
An antenna for use with portable duplex radio transceivers, such as those found in hand-held cellular telephones, which includes a pair of co-planar radiating patch elements elevated above a conductive surface by a conductive bar. The surface and bar define a reference ground plane which inherently isolates the patches. The patches are shaped so that they operate in a desired frequency band as well as band-pass filters--one of the patches is tuned to the transmit band and serves a transmit structure, and the other patch is tuned to the receive band and serves as a receive structure. Switching devices such as positive-intrinsic negative (PIN) diodes can be disposed along the space between the patches and the ground plane to allow each structure to be tuned. The antenna is efficient, because of inherent isolation between the receive and transmit patches, and eases the front end filtering functions traditionally performed by a duplexer. It can be completely enclosed within the chassis of a hand-held telephone.
REFERENCES:
patent: 2947987 (1960-08-01), Dodington
patent: 4641366 (1987-02-01), Yokoyama et al.
patent: 4876552 (1989-10-01), Zakman
patent: 5231407 (1993-07-01), McGirr et al.
Camwell Paul L.
McGirr Andrew E.
McRory John G.
NovAtel Communications Ltd.
Wimer Michael C.
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