Characteristics of annular-ring microstrip antenna
Abstract
The characteristics of an annular-ring microstrip antenna operating in TM(11) and TM(12) modes are determined experimentally. The results confirm the main conclusions of a theoretical study published recently by Ali et al. (1982) and show that: (a) the bandwidth of the TM(11) mode is very small while that of the TM(12) mode is relatively large, and (b) the launching efficiency of the TM(12) mode is highly sensitive to the feed position while that of the TM(11) mode is virtually independent of the feed position.
- Publication:
-
Electronics Letters
- Pub Date:
- November 1982
- DOI:
- 10.1049/el:19820718
- Bibcode:
- 1982ElL....18.1051D
- Keywords:
-
- Antenna Design;
- Field Mode Theory;
- Microstrip Antennas;
- Microwave Antennas;
- Transmission Efficiency;
- Antenna Feeds;
- Bandwidth;
- Electrical Impedance;
- Printed Circuits;
- Ring Structures;
- Communications and Radar