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Improved Axial-Mode-Helical-Antenna Impedance Matching Utilizing Triangular Copper Strip for 2.4- GHz WLAN

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Executive Summary

In this paper, impedance matching for a PVC-tube helical antenna operating at the frequency of 2.4 GHz is experimentally investigated. The helical wire is wound around a Poly-Vinyl Chloride (PVC) pipe having the diameter of 34 mm. The PVC pipe, in effect, shifts down the onset of axial-mode radiation to lower value of normalized circumference of the helical antenna, compared with an air-core helical antenna. Impedance matching is accomplished by replacing a section of helical wire near the feed point with a triangular copper strip having the height of 15 mm. The length of the matching strip is identical to that of the helical wire being replaced.

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