Dual frequency antenna

摘要

First and second elements mounted in parallel spaced apart relation with one end shorted to form a quarterwave transmission line at a base frequency and a halfwave transmission line at an even harmonic thereof, with the spacing being lambda /8 at the base frequency and lambda /4 at the harmonic and a feedline being connected between the elements and positioned so the impedance of the antenna matches the impedance of the feedline at the base frequency and the diameter of the feedline being adjusted so the impedance of the antenna matches the impedance of the feedline at the harmonic frequency.