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Rotatable-antenna-and-integral-shielded-impedance-matching-network

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Rotatable antenna and integral, shielded impedance matching network

Details

Inventors: Blaese, Herbert R.;
Assignee:
Primary Examiner: Wimer; Michael C.
Assistant Examiner:
Attorney, Agent or Firm: Gerstman, Ellis & McMillin, Ltd.

A rotatable antenna is disclosed in which a radiator and matching network comprise a contiguous electrically conductive spring wire. The matching network comprises a coil extending generally perpendicular to the radiator. A 50 ohm coaxial cable has its ground conductor electrically connected to an electrically conductive sleeve which overlies the coil while the main conductor of the coaxial cable is tapped to the coil so that the matching network substantially matches the radiator impedance to the transmission line impedance. The matching network is rotatable with respect to a mounting member so that the radiator becomes rotatable about an axis that is generally perpendicular to the radiator.

DETAILED DESCRIPTION In accordance with the present invention, a rotatable antenna is provided which comprises a radiator having a distal end and a proximal end.
A matching network is coupled to the proximal end of the radiator.
The matching network comprises a coil that extends generally perpendicular to the radiator.
An electrically conductive sleeve overlies the coil and a transmission line is coupled to the electrically conductive sleeve and the coil.
The transmission line comprises a main conductor and a ground conductor.
The main conductor of the transmission line is tapped to the coil and the ground conductor of the transmission line is electrically connected to the sleeve.
In this manner, the matching network substantially matches the radiator impedance to the transmission line impedance.
A mounting member is provided for mounting the antenna to a transmitter/receiver.
The matching network is rotatable with respect to the mounting member whereby the radiator is rotatable about an axis that is generally perpendicular to the radiator.
In the illustrative embodiment, the transmission line is a 50 ohm coaxial cable.
In the illustrative embodiment, the antenna includes a plastic radiator housing, with the radiator housing defining a bore for receiving the radiator.
The radiator and matching network comprise a contiguous electrically conductive spring wire.
In the illustrative embodiment, a non-conductive sleeve separates the matching network from the electrically conductive sleeve.
A small coil is contiguous with the first mentioned coil, with the electrically conductive sleeve having a smaller sleeve portion for receiving the small coil.
The ground conductor, small coil and the smaller sleeve portion are electrically connected to each other.
In the illustrative embodiment, the rotatable antenna has a radiator that is a one-half wavelength element suitable for a bandwidth between about 800 MHz and 1000 MHz.
A more detailed explanation of the invention is provided in the following description and claims, and is illustrated in the accompanying drawings

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