Analysis of Radiation Characteristics of a Probe-Excited Rectangular Ring Antenna by the Dyadic Green's Function Approach

Abstract

Abstract-Radiation characteristics of a probe-excited rectangular ring antenna are investigated by using the dyadic Green's function approach. The radiation characteristics, such as radiation pattern, beam-peak direction, half-power beamwidth and directivity, are analyzed. For the specified operating frequency, the ring width and ring height are selected as the same cross-sectional dimension of rectangular waveguide operated at the dominant mode. The effects of the excited probe and rectangular ring to the modal distributions are described. For the desired modal distribution, the directivity primarily depends on the ring lengths. For compact size of the proposed antenna, the ring length of 0.4λ is chosen to provide a bidirectional pattern with the calculated half-power beamwidth in E-plane and H-plane of 100 and 69 degrees respectively, and directivity of 4.43 dBi. Furthermore, the prototype antenna was fabricated and measured. The coincided results between the theory and the experiment are obtained.

Full-Wave Investigations of a Probe-Excited Rectangular Ring Antenna by Method of Moments With RWG Basis Functions

“…In addition, bidirectional antennas can be enlarged the cell size along the street in microcell environment [1,2]. Therefore, many researches and developments on bidirectional antennas have been extensively conducted [3][4][5][6][7][8][9][10]. Nevertheless, the low cost must be considered since the number of cell is very large.…”

“…Nevertheless, the low cost must be considered since the number of cell is very large. Hence, the probe-excited different ring shapes, such as rectangular, circular, elliptical rings, are introduced [6][7][8][9][10]. The omnidirectional pattern of linear probe is forced by the surrounded rings to provide the bidirectional pattern.…”

“…The omnidirectional pattern of linear probe is forced by the surrounded rings to provide the bidirectional pattern. Because of the simple structure, the bidirectional rectangular ring was presented in [6,8,9] to be used as a base station antenna at the narrow and long path serviced areas. It is also possible to adjust the beamwidth of the antenna corresponding to the applications by changing the ring width and ring height.…”

Fast Computation of the Forward Solution in Controlled-Source Electromagnetic Sounding Problems

“…In particular, the behavior of K h (λ k,n ρ) as ρ increases satisfies the radiation condition, which demands that the energy radiated by the source to distant observation points is outgoing and bounded [38][39][40][41][42][43][44]. Use of (17) in (1) leads to…”

Electromagnetic Analysis of a Non Invasive Microwave Radiometry Imaging System Emphasizing on the Focusing Sensitivity Optimization

“…In order to solve this problem, a Green's function technique is adopted [10][11][12][13][14][15][16]. According to the Reciprocity theorem, a response of a system to a source is unchanged when source and measurer are interchanged.…”