Passive temperature compensation scheme for microstrip antennas

• US 5,021,795 A
• Filed: 06/23/1989
• Issued: 06/04/1991
• Est. Priority Date: 06/23/1989
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Masiulis, Joseph
• Primary Examiner(s): Wimer, Michael C.
• Assistant Examiner(s): Brown, Peter Toby
• Application Number:
  US07/370,672
• Time in Patent Office: 711 Days
• Field of Search: 343/700 MS, 343/745, 343/746, 343/749, 343/829, 343/830, 361/274, 361/282
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A temperature dependent capacitor formed from bi-metallic strips is used to compensate for changes in the resonant frequency of a microstrip patch antenna array structure due to dielectric constant thermal effects.

Claims

1. For a microstrip patch antenna on a substrate of dielectric material, a method for compensating antenna resonant frequency for changes due to substrate dielectric constant thermal effects, the method comprising:

disposing passive, temperature dependent capacitors about one or more radiating edges of the microstrip patch antenna;

wherein the passive, temperature dependent capacitors comprise bi-metallic strips that move with respect to one another in response to temperature change.

2. For a microstrip patch antenna on a substrate of dielectric material having one or more radiating elements of predetermined electrical size and predetermined resonant frequency, a method for compensating the resonant frequency for changes due to dielectric constant thermal effects, the method comprising:

disposing temperature dependent bi-metallic plate capacitors about one or more radiating edges of the microstrip patch antenna so that changes in capacitive loading resulting from changes in temperature will result in corresponding changes in electric size of the radiating elements, thus substantially offsetting changes in resonant frequency resulting from dielectric constant thermal effects.