Transmission line resonator loop antenna

• US 20080036667A1
• Filed: 08/10/2006
• Published: 02/14/2008
• Est. Priority Date: 08/10/2006
• Status: Abandoned Application

• Current Assignee: LoJack Operating Company, LP (Solera Holdings Incorporated)
• Original Assignee: LoJack Operating Company, LP (Solera Holdings Incorporated)
• Inventors: Fedan, Orest
• Application Number:
  US11/502,191
• Publication Number:
  US 20080036667A1
• Time in Patent Office: Days
• US Class Current: 343/741
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

A transmission line resonator loop antenna includes a transmission line resonator for receiving an input excitation signal and producing a predetermined resonant output signal which is substantially phase reversed relative to the input excitation signal; and a loop antenna having one end responsive to the phase reversed output signal and the other end responsive to a reference excitation signal for maintaining the predetermined resonance.

Claims

1. A transmission line resonator loop antenna comprising:

a transmission line resonator for receiving an input excitation signal and producing a predetermined resonant output signal which is substantially phase reversed relative to said input excitation signal; and

a loop antenna having one end responsive to said phase reversed output signal and the other end responsive to a reference excitation signal for maintaining said predetermined resonance.

2. The transmission line resonator loop antenna of claim 1 in which said transmission line resonator includes a coaxial cable.

3. The transmission line resonator loop antenna of claim 1 in which said transmission line resonator includes a parallel conductor transmission line.

4. The transmission line resonator loop antenna of claim 3 in which said parallel conductor transmission line includes ribbon conductors.

5. The transmission line resonator loop antenna of claim 1 in which said transmission line resonator is substantially a half wavelength in length.

6. The transmission line resonator loop antenna of claim 1 in which said loop antenna includes a tuning bar interconnected between the ends of one of the conductors of said transmission line resonator.

7. The transmission line resonator loop antenna of claim 6 in which said transmission line resonator includes a coaxial cable and said tuning bar is connected between the ends of the shield of the coaxial cable.

8. The transmission line resonator loop antenna of claim 1 in which said transmission line resonator and said loop antenna both radiate.

9. The transmission line resonator loop antenna of claim 1 in which said transmission line resonator is disposed in a convoluted path to reduce the size.

10. The transmission line resonator loop antenna of claim 1 in which the electric field of said transmission line resonator is substantially contained between the conductors of said transmission line resonator.