Planar antenna with integral impedance matching

Details Planar antenna with integral impedance matching Planar antenna with integral impedance matching

1996-09-27

1998-07-14

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Microstrip

343702, 343749, 343850, H01Q 124, H01Q 138

Patent

active

057811598

ABSTRACT:
Planar antennas 10a, 10b require impedance matching with their associated transceivers 20a, 20b. Conventionally, an inductance coil is placed between the transceiver 20a, 20b and the antenna 10. Such coils add loss, require space within the transciever, and increase costs. This invention replaces the inductance coil with a planar transmission line 18a, 18b within the planar antenna 10a, 10b, such as a co-planar line, slotline, or microstrip line. If desired, active circuits 30 may be applied across the transmission line 18a, 18b, with an RF choke 42 being used to allow a dc bias to drive the active circuits 30 while preventing interference with RF operation.

REFERENCES:
patent: 4083053 (1978-04-01), Hall
patent: 4513292 (1985-04-01), Bowman
patent: 4777490 (1988-10-01), Sharma et al.
patent: 5394159 (1995-02-01), Schneider et al.

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