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A Review of and New Results for Broadband Antennas for Digital Terrestrial Broadcasting: The Modified Batwing Antenna

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1 Author(s)
Haruo Kawakami ; Antenna Giken Co., Ltd., 4-72 Miyagayatou Minuma-ku, Saitama-city, Saitama Pref., Japan 337-0011

Digital terrestrial broadcasting services are in the Japanese UHF band of 470 to 770 MHz. The bandwidth of the UHF-TV channel is 6 MHz. The batwing radiator, which is at the heart of the super-turnstile antenna system for FM and VHF-TV broadcasting, has broadband characteristics. In this paper, we investigated a modified batwing antenna for UHF digital terrestrial broadcasting. The characteristics of the two- and four-element modified batwing antennas, with an infinite or a finite wire reflector, were calculated using NEC-WIN Pro. We evaluated the characteristics of these antennas in the Japanese UHF-TV broadcasting band. A broadband input impedance and high gain were obtained in the calculation and the measurement. A four-plane arrangement of parallel batwing antennas was also examined for directionality. The batwing element was arranged in parallel, and the feed interval was a half-wavelength. High gain and wideband characteristics were obtained with simple power-supply construction. This antenna has sufficient characteristics for use as the transmitting antenna for digital terrestrial broadcasting stations and repeater stations in the Japanese UHF band.

Published in:

IEEE Antennas and Propagation Magazine  (Volume:52 ,  Issue: 6 )