Characteristics of high-gain wideband ring loop antenna for digital terrestrial broadcasting

Abstract

This paper examined the ring loop antenna with which circumference length fed in parallel in about full- wavelength of loop antenna element as an antenna for digital terrestrial broadcasting. That is, numerical analysis was performed about conditions for both the directivity of the ring loop antenna of many stages and the impedance characteristic to show the broadband characteristic. It is the ring loop antenna of the structure, which carried out parallel electric feed of all the elements in this paper, added one reflector element, and was arranged to the vertical form. All number element of the antenna was consisted of sum total of 5-elements of director element of 3-elements, radiator element, and compound reflector element. The next high-gain ring loop antenna element for the digital terrestrial broadcasting with wide-band characteristics is described. As a feed circuit of the log-periodic structure, the condition as radiation pattern and impedance characteristic of ring loop antenna of the 12 elements together showed wide-band characteristics was analyzed numerically in respect of all component count.