A Broadband VHF/UHF Double-Whip Antenna

This paper presents a broadband VHF/UHF double-whip antenna with one lossless matching scheme combining two methods, embedded transmission line matching method and lumped-distributed hybrid matching method. By adjusting the length of the embedded transmission line, the combination of double-whip antenna and the transmission line can achieve resonance, thus realize a coarse matching. By adding a lumped-distributed hybrid matching network at the feeding point of the double-whip antenna, we can further improve the matching for the double-whip antenna. Moreover, based on the two-step matching scheme, a double-whip antenna has been designed and fabricated. Measured results show that, the VSWRs of the double-whip antenna, with the electrical lengths of 0.16 λ and 0.03 λ at the minimum operation frequency respectively, are less than 2 over a 17:1 octave bandwidth, and the horizontal gains of the antenna are between 4.2 dB and 6.8 dB. Thanks to its high gain, broadband and low reflection, the proposed double-whip antenna in this paper is ideal for application in vehicle wireless communication.