Side antenna

• US 4,980,695 A
• Filed: 11/22/1989
• Issued: 12/25/1990
• Est. Priority Date: 11/22/1989
• Status: Expired due to Fees

• Current Assignee: Herbert R. Blaese
• Original Assignee: Herbert R. Blaese
• Inventors: Blaese, Herbert R.
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): Brown, Peter T.
• Application Number:
  US07/440,506
• Time in Patent Office: 398 Days
• Field of Search: 343/711, 343/713, 343/714, 343/715, 343/722, 343/745, 343/825, 343/829, 343/830, 343/847, 343/888, 343/900
• US Class Current: 343/715
• CPC Class Codes: H01Q 1/1285 with capacitive feeding through the windscreen

Abstract

An inside antenna is provided comprising a housing, a capacitor and an inductor located within the housing and cooperating to form an LC network, a radiator connected to the inductor, and a coaxial cable with its central conductor tapped to a selected location of the inductor. The capacitor is formed by a radiator plate to which the radiator and inductor are connected and a ground plate. A set screw is carried by the housing and engages the ground plate so that movement of the set screw varies the position of the ground plate relative to the radiator plate.

Claims

1. An inside antenna which comprises:

a housing;

capacitive means located within the housing;

inductive means located within the housing;

said capacitive means and said inductive means cooperating to form an L-C network within the housing;

a radiator having a distal end and a proximal end, said proximal end located within the housing and said distal end located outside of the housing;

a first electrically conductive means coupling said proximal end to said inductive means;

an electrical cable having a main conductor and a ground conductor;

said capacitive means comprising a ground plate that is electrically connected to said ground conductor;

means for varying the impedance of L-C network, said varying means comprising means for varying said ground plate to change its position relative to said first electrically conductive means;

second electrically conductive means connecting said main conductor to said inductor means at a location on said inductor means that is spaced from said proximal end connection to said inductor means, said second electrically conductive means tapping a selecting location on the inductor means to provide an impedance match;

means for mounting the housing on a selective surface; and

said varying means comprising a screw carried by the housing for engagement with said ground plate.

2. An inside antenna as defined by claim 1, said first electrically conductive means comprising an electrically conductive radiator plate, means connecting said proximal end to said radiator plate and means connecting said inductor means to said radiator plate.

3. An inside antenna as defined by claim 2, said capacitive means comprising a ground plate having a surface that is generally parallel to a surface of said radiator plate, whereby said radiator plate and said capacitive means form electrodes of a capacitor.

4. An inside antenna as defined by claim 3, said varying means comprising means for providing relative movement between said ground plate and said radiator plate.

5. An inside antenna as defined by claim 1, said mounting means comprising a pressure sensitive adhesive area on said housing.

6. An inside antenna as defined by claim 1, said mounting means comprising apertures defined by said housing to receive mounting screws.

7. An inside antenna as defined by claim 1, said radiator having an electrical length of one-half wave length or a full multiple thereof.

8. An inside antenna as defined by claim 1, said electrical cable comprising a coaxial cable with said main conductor comprising the central conductor and said ground conductor comprising a spaced, concentrically surrounding conductor.