Planar antenna

Details Planar antenna Planar antenna

1993-04-19

1995-04-25

Hajec, Donald

Communications: radio wave antennas

Antennas

Microstrip

343830, 343846, H01Q 138

Patent

active

054103231

ABSTRACT:
A planar antennas has a square radiating conductor with a total of eight slits defined therein. Each of the slits extends from one side of the radiating conductor parallel to opposing sides flanking the one side. The slits are positioned such that they slits remain in the same pattern when the radiating conductor is turned 90.degree.. Any changes in the impedance as the offset length of a feeding point from the center of the planar antenna are relatively small, specifically range from 0 ohm to 400 ohm. The planar antenna is small in size, is easy to achieve impedance matching with a general feeding system having an impedance of 50 ohms, for example, and has wider frequency band. The planar antenna is also capable of generating circularly polarized electromagnetic waves.

REFERENCES:
patent: 4857938 (1989-08-01), Tsukamoto et al.
patent: 5036336 (1991-07-01), Bouko et al.
patent: 5216430 (1993-06-01), Rahm et al.
patent: 5243353 (1993-09-01), Nakahara et al.
patent: 5245745 (1993-09-01), Jensen et al.
Sharma et al., "Analysis and Optimized Design of Single Feed Circularly Polarized Microstrip Antennas", IEEE Transactions on Antennas and Propagation, vol. AP-31, No. 6, Nov. 1983.

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