Circular polarization antennas and methods

Details Circular polarization antennas and methods Circular polarization antennas and methods

2001-08-24

2002-11-26

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S801000

Reexamination Certificate

active

06486848

ABSTRACT:

BACKGROUND INFORMATION
1. Field of the Invention
The present invention relates generally to the field of wireless communication, and particularly to the design of an antenna.
2. Description of Related Art
Small antennas are attractive in portable wireless communication devices. One type of compact antennas uses a circular polarization. A circularly polarized antenna may improve the performance of a mobile system. To produce a resonant antenna structure at a certain radio frequency and within a certain bandwidth with a circular polarization, classical antenna structures need to have a certain volume. This volume is fairly large as the bandwidth required is large, especially as the antenna needs to be symmetrical to meet the circular polarization constraint.
Accordingly, the present invention addresses the needs of small compact circularly polarized antennas with possibly a wide bandwidth that could be integrated in a mobile device.
SUMMARY OF THE INVENTION
The present invention provides an antenna system using capacitively loaded magnetic dipoles, magnetically coupled in order to obtain a circular polarization. In a first embodiment of the present invention, two intersecting linearly polarized antenna elements are arranged to obtain a circular polarization. In a second embodiment, a first linearly polarization antenna is placed orthogonally to a second linearly polarization antenna where a single active feed excites the first linearly polarized element. In terms of lengths, the first linear polarization antenna can have a length that is greater or less than the length of the second linear polarization antenna. On the vertical or z-axis, the first linear polarization antenna can be positioned above, below, or at the same level as the second linear polarization antenna. One or more elements, such as an electronic chip, can be inserted between the first linear polarization antenna and the second linear polarization antenna without disturbing the circular polarization generated from the magnetically coupled first and second linearly polarized antennas. In a third embodiment, a circular polarization antenna structure is constructed with two curved linear polarization antennas. In a fourth embodiment, an antenna system that is able to alternate between right hand circular polarization (RHCP) and left hand circular polarization (LHCP). In a fifth embodiment, an antenna system is configured to tune to a wider frequency band.
Advantageously, the antenna system in the present invention allows for circularly polarized waves while occupying a small volume. The present invention further advantageously provides high isolation and strong frequency selectivity through the use of capacitively loaded magnetic dipoles.
Other structures and methods are disclosed in the detailed description below. This summary does not purport to define the invention. The invention is defined by the claims.


REFERENCES:
patent: 5592182 (1997-01-01), Yao et al.
patent: 5952982 (1999-09-01), Jorgenson et al.
patent: 6014107 (2000-01-01), Wiesenfarth

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