Measured performance of a broadband matching section for peripherally fed helical antennas
Abstract
The measured performance of an impedance matching section incorporated into the first turn of a peripherally fed helical antenna to transform its impedance to 50 omega is described. The design of the matching section is briefly reviewed. The measured results show that very low VSWR (1,2:1) can be achieved over the usable frequency range of the antenna. In addition to showing the basic impedance matching performance, results are also presented to illustrate the effect of the number of helix turns and of the conductor diameter on the impedance match. Antenna pattern data show that improved performance can be achieved by a simple termination at the free end of the helix.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1983
- Bibcode:
- 1983STIN...8525670B
- Keywords:
-
- Antenna Feeds;
- Helical Antennas;
- Impedance Matching;
- Reflectance;
- Frequency Ranges;
- Polarization Characteristics;
- Transformers;
- Communications and Radar