Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-12-11
2002-08-13
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S853000
Reexamination Certificate
active
06433744
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to radio wave antennas and directive radio wave systems and devices, and more particularly to a compact electromagnetic antenna that can be used in conformity with a variety of surfaces and supports wideband signaling.
At present there is a broad class of antennas whose members support wideband signaling. For purposes of this application, the term “wideband” is intended to mean signals that have bandwidths several tens of percent of the center frequency of the communications. There are also narrowband antennas whose physical envelope characteristics require only very small volumes and areas, and can be conformally placed on surfaces of gradual contours. A class of such antennas is known in the art as patch antennas or microstrip antennas.
Patch antennas are a subset of resonant antennas and therefore are capable of signaling over only a small bandwidth, on the order of a few percent of center frequency. This behavior is discussed by Professors Stutzman and Thiele in the second edition of their text
Antenna Theory and Design
, John Wiley & Sons 1998. The main challenge in microstrip antenna design is thus to achieve a wider signaling bandwidth.
Currently, there are several communication systems in development that propose to employ very wideband signaling. Many of these desired systems will require, or would greatly benefit from, a small volume conformal antenna. There is therefore a recognized need for a patch antenna that is capable of handling wideband signaling.
BRIEF SUMMARY OF THE INVENTION
Briefly, in accordance with a preferred embodiment of the invention, two essentially identical electrically conducting rectangular plates are provided, with their surfaces separated and lying in parallel planes. A frequency dependent dielectric is situated between the plates and electrical conductors are connected to the plates, thus forming a patch antenna that is resonant over a wideband frequency range and is consequently capable of radiating and receiving a wideband signal.
REFERENCES:
patent: 4201989 (1980-05-01), Czerwinski
patent: 4847625 (1989-07-01), Dietrich et al.
patent: 5594455 (1997-01-01), Hori et al.
patent: 6034637 (2000-03-01), McCoy et al.
patent: 6097271 (2000-08-01), Kozakoff
patent: 6206292 (2001-03-01), Robertz et al.
“Dieletric Spectroscopy of Polymeric Materials,” James P. Runt; John J. Fitzgerald, American Chemical Society, p. 209.
“Conformal Microstrip Antennas and Microstrip Phased Arrays,” Robert E. Munson, IEEE Transactions on Antennas and Propagation, Jan. 1974, pp. 74-78.
Davenport David Michael
Hershey John Erik
Robinson Gregory Bruce
Sexton Daniel White
Welles II Kenneth Brakeley
Breedlove Jill M.
Cabou Christian G.
General Electric Company
Nguyen Hoang
Wong Don
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