Influence of Wire-Based Impedance-Matching on Helical Antenna Radiation and Limitations of Equivalent Model

Abstract

We investigate the influence of a wire-based impedance-matching network for an axial-mode helical antenna on the radiation pattern. This network, proposed in our previous work, comprises a single wire attached to the helix. We show that the matching wire, mounted on a tubular dielectric support and attached to the helix close to the reflector, does not degrade the antenna radiation pattern. We also investigate limitations of the equivalent thin-wire model proposed in our previous work.

Keywords

• Helical antenna
• impedance-matching
• radiation pattern
• thin-wire model