Title :
A broad-band sleeve monopole integrated into parallel-plate waveguide
Author :
Chen, Zhi Ning ; Hirasawa, Kazuhiro ; Wu, Ke
Author_Institution :
Inst. of Inf. Sci. & Electron., Tsukuba Univ., Ibaraki, Japan
fDate :
7/1/2000 12:00:00 AM
Abstract :
In this paper, a sleeve monopole is proposed and studied theoretically and experimentally. It consists of a resonant loading and a conventional sleeve monopole vertically integrated in a parallel-plate waveguide. A modal expansion technique is used to model the induced currents over the monopole surface, and fields in the region of interest are characterized by cylindrical harmonic functions. A Fourier least-square integration is applied to find the expansion coefficients by the boundary and continuity conditions. A 5.8-GHz industrial-, scientific-, and medical-band (ISM-band) example is selected for the studies. It is found that the new monopole exhibits a large bandwidth exceeding 37% for -10-dB return loss. Calculated results are validated by the measurements
Keywords :
antenna theory; frequency response; integration; monopole antennas; parallel plate waveguides; waveguide antennas; -10 dB; 5.8 GHz; Fourier least-square integration; ISM-band; boundary conditions; broadband sleeve monopole; continuity conditions; cylindrical harmonic functions; expansion coefficients; microwave antenna; modal expansion technique; parallel-plate waveguide; resonant loading; vertical integration; Antenna feeds; Bandwidth; Coaxial components; Dielectrics; Impedance; Receiving antennas; Resonance; Satellite antennas; Satellite broadcasting; Waveguide theory;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
