《Characteristics_of_high_gain_wideband_ring_loop_antenna_and_its_application》.pdf

Characteristics of High-Gain Wideband Ring Loop Antenna and its Application 145 8 x Characteristics of High-Gain Wideband Ring Loop Antenna and its Application Haruo Kawakami Antenna Giken Corp. Japan 1. Introduction 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. In this paper we investigate the ring loop antenna for the UHF digital terrestrial broadcasting. The characteristics of the linear ring loop and circular ring loop antenna are calculated by NEC-WIN Pro. We evaluate the characteristics of these antennas in the Japanese UHF-TV broadcasting band (470MHz- 770MHz). A broadband antenna consisting of the ring loop antenna is presented for the digital terrestrial broadcasting. A ring loop antenna is excited by a simple and low-cost feeder system. The broadband input impedance and the high gain are obtained in the calculation and the measurement. The input impedance became 50 Ωand wideband characteristics were obtained in the simple power supply construction. Then the high-gain and wideband characteristics were obtained with the simple power supply construction. This antenna has sufficient characteristics as the trans