Ultra-broadband thin planar antenna

Details Ultra-broadband thin planar antenna Ultra-broadband thin planar antenna

2002-08-13

2004-07-27

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S830000

Reexamination Certificate

active

06768461

ABSTRACT:

TECHNICAL FIELD
The present invention relates to antennas and more particularly to a thin ultra-broadband antenna with conductive elements in a single plane.
BACKGROUND ART
The optimum three-dimensional shape for a broadband dipole, as concluded by antenna researchers, is a dipole consisting of two opposed “light bulb” shaped elements. The optimum shape for a broadband planar monopole over an orthogonal, infinite ground plane is believed to be elliptical or circular. The optimum shape for a planar dipole or a planar monopole with a co-planar finite ground plane has not previously been addressed.
U.S. Pat. No. 4,605,933 to Butscher discloses a microstrip antenna with a lower ground plane, a spaced rectangular upper ground plane and a circular radiating element coplanar with the upper ground plane. The disclosed antenna requires an impedance matching arrangement to connect to a transmission line. The disclosed antenna has the configuration of a microstrip antenna with the lower ground plane in a second spaced plane, and is thus not a planar antenna. U.S. Pat. No. 6,329,950 to Harrell et al. discloses a planar antenna with concentric elements. An inner circular element within a rectangular outer element is disclosed. The inner and outer elements are separated by a gap, but electrically connected across the gap by a shorting element and a coaxial cable feed.
The frequency range of 825 MHz to 6 GHz covers numerous wireless bands, including the cellular/GSM, PCS, ISM, MDS/MMDS and UNII bands. An ultra-broadband antenna that operates across the frequency range of 825 MHz to 6 GHz is desirable. A very thin ultra-broadband antenna that is simple and inexpensive to produce is also desirable.
DISCLOSURE OF THE INVENTION
An antenna includes an electrically conductive, planar antenna portion, a transmission line and a housing. The antenna portion has an elliptical first element and a rectangular second element. The first and second elements are spaced, adjacent and co-planar. The transmission line has a first conductor directly connected to the first element and a second conductor directly connected to the second element. The housing encloses the antenna portion.


REFERENCES:
patent: 4083046 (1978-04-01), Kaloi
patent: 4160976 (1979-07-01), Conroy
patent: 4605933 (1986-08-01), Butscher
patent: 4987421 (1991-01-01), Sunahara et al.
patent: 5933115 (1999-08-01), Faraone et al.
patent: 6246368 (2001-06-01), Deming et al.
patent: 6329950 (2001-12-01), Harrell et al.

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