Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2001-01-26
2001-11-20
Phan, Tho G. (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S725000, C343S770000
Reexamination Certificate
active
06320548
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to an antenna system comprising a dual disk antenna and a radio frequency amplifier integrated circuit chip that can be operated as a receiving antenna or as a transmitting antenna. The optimum application frequency is determined by the disk circumference with frequency and impedance fine-tuned by the relative spacings between the two disks.
(2) Description of the Related Art
U.S. Pat. No. 5,982,326 to Chow et al. describes an active microwave antenna that includes a two-part micropatch antenna that receives signals having a first circular polarization and transmits signals having the opposite circular polarization.
U.S. Pat. No. 5,973,650 to Nakanishi describes an antenna apparatus comprising a printed circuit board, a first loop antenna, and a second loop antenna.
U.S. Pat. No. 4,947,180 to Schotz describes an antenna assembly for receiving FM signals.
U.S. Pat. No. 5,754,142 to Wine describes a high frequency antenna system using parallel conductors with a single conductor and supporting materials.
U.S. Pat. No. 5,854,480 to Noto describes a system having an integrated circuit capacitively coupled to an antenna.
U.S. Pat. No. 5,714,965 to Taguchi describes an active receiving antenna with a coplanar waveguide having a high actual gain in a frequency band as broad as 100% or more of the central frequency.
U.S. Pat. No. 5,138,330 to Lindenmeier et al. describes an active window pane antenna for use in motor vehicles.
SUMMARY OF THE INVENTION
Antenna systems that are low cost and easy to fabricate can be used in a wide range of applications. These antenna systems can be transmitting or receiving antenna systems. Often the antenna systems are used with an RF (radio frequency) amplifier integrated circuit chip to form an active antenna system. The antenna is positioned as a part of the counterpoise element of the antenna system.
It is a principal objective of this invention to provide an active receiving antenna comprising dual disk antenna elements and an RF amplifier integrated circuit chip that is mounted directly on the counterpoise element of the antenna system and becomes an integral part of the antenna itself.
It is another principal objective of this invention to provide a transmitting or receiving antenna comprising dual disk antenna elements. These disks are oriented to each other in such a manner that the relationships of the radiating element to the counterpoise element provides the capacitive and inductive relationship that provides the required 50 ohm match.
It is another principal objective of this invention to provide an antenna comprising dual disk antenna elements that can be electronically switched between a transmitting antenna and an active receiving antenna using a RF amplifier chip.
These objectives are achieved by using dual disk antenna elements which are formed by etching a pattern in a layer of conducting material, such as copper or aluminum, formed on a substrate of dielectric material. One of the disks acts as the active antenna element and the other disk acts as a counterpoise antenna element. In one embodiment a RF amplifier chip, mounted directly on the counterpoise element, is used to form an active receiving, dual-disk antenna. In another embodiment a RF amplifier chip is used with an electronic switch to activate the RF amplifier chip when the antenna is used as a receiving antenna and to switch the RF chip out of the circuit when the antenna is used as a transmitting antenna. In this second embodiment the RF amplifier and the electronic switch are both mounted on the counterpoise element disk as in the first embodiment.
REFERENCES:
patent: 4947180 (1990-08-01), Schotz
patent: 5138330 (1992-08-01), Lindenmeier et al.
patent: 5181042 (1993-01-01), Kaise et al.
patent: 5243353 (1993-09-01), Nakahara et al.
patent: 5646634 (1997-07-01), Bokhari et al.
patent: 5675346 (1997-10-01), Nishikawa et al.
patent: 5714965 (1998-02-01), Taguchi
patent: 5754142 (1998-05-01), Wine
patent: 5854480 (1998-12-01), Noto
patent: 5864318 (1999-01-01), Cosenza et al.
patent: 5973644 (1999-10-01), Haneishi et al.
patent: 5973650 (1999-10-01), Nakanishi
patent: 5982326 (1999-11-01), Chow et al.
patent: 6252556 (2001-06-01), Ito et al.
Harrell Daniel W.
Wallace Pamela R.
Ackerman Stephen B.
Integral Technologies, Inc.
Phan Tho G.
Prescott Larry J.
Saile George O.
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