Quarter-wave gap-coupled tunable strip antenna

Details Quarter-wave gap-coupled tunable strip antenna Quarter-wave gap-coupled tunable strip antenna

1993-11-26

1995-05-30

Hajec, Donald

Communications: radio wave antennas

Antennas

Microstrip

343848, H01Q 138

Patent

active

054205964

ABSTRACT:
An antenna has a quarter wave resonant strip (10) and first and second parasitically excited strips (12 and 14) resonant at a lower and upper frequency, respectively, of the antenna bandwidth. The strips (10, 12 and 14) have trim tabs (20, 22 and 24) for adjusting the resonant frequency of each strip. The location of a feed (30) is set to provide a desired impedance match for use by a radio (60) such as a pager. A ground plane (40) provides a grounding for the strips (10, 12 and 14) and inhibits undesirable radio frequency interaction between the radio (60) and the strips (10, 12 and 14).

REFERENCES:
patent: 4700194 (1987-10-01), Ogawa et al.
patent: 4814776 (1989-05-01), Caci et al.
patent: 4849765 (1989-07-01), Marko
patent: 4862181 (1989-08-01), Ponce de Leon et al.
patent: 4933680 (1990-06-01), Shapiro et al.
patent: 5008681 (1991-04-01), Gavallaro et al.
patent: 5075691 (1991-12-01), Garay et al.
patent: 5113196 (1992-05-01), Ponce de Leon et al.
patent: 5220335 (1993-06-01), Huang
patent: 5241321 (1993-08-01), Tsao
patent: 5245745 (1993-09-01), Jensen et al.

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