End fed electric microstrip quadrupole antenna

Communications: radio wave antennas – Antennas – With grounding structure

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343853, H01Q 138

Patent

active

039720500

ABSTRACT:
An end fed electric microstrip quadrupole antenna consisting of a thin elrically conducting, rectangular-shaped element formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The feed point is located at one end of the centerline of the antenna length. The antenna bandwidth increases with the width of the element and spacing between the element and ground plane. The end fed microstrip quadrupole antenna operates in a degenerate mode, i.e., two oscillation modes occurring at the same frequency. Along the element length, the oscillation occurs in a dipole mode (fundamental mode) whereas along the element width the oscillation occurs in a quadrupole mode (higher order mode). The corners nearest the feed point may be used for fine tuning of the antenna by trimming small strips of copper from the corner.

REFERENCES:
patent: 3810183 (1974-05-01), Krutsinger et al.
patent: 3811128 (1974-05-01), Munson

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