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Magnetic field distributions of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot
(2008-12-01)
Wounchoum, Phairote
;
Worasawate, Denchai
;
Phongcharoenpanich, Chuwong
;
Krairiksh, Monai
in this paper, the magnetic field distribution of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot is presented. The correlations between the field distributions of the antenna and the mode-based field distributions are presented. The radiation pattern, magnetic field distribution and magnitude of S11 are investigated in the terms of the length of the sectoral resonator. It shows that the TE112 mode has degenerated to the magnitude of S11 for the circumferential slot array antenna. The results provide useful information for the design of switched-beam array antenna on the concentric sectoral cylindrical resonators. ©2008 IEEE.
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Radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot
(2007-12-01)
Wounchoum, Phairote
;
Phongcharoenpanich, Chuwong
;
Worasawate, Denchai
;
Krairiksh, Monai
This paper presents the radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot. The magnetic fields inside the sectoral cylindrical resonator for the first few modes are presented with sectoral angle of 60 degrees. It shows that the appropriate mode for a slot array antenna on a concentric sectoral cylindrical resonator is the TM<inf>110</inf> mode. The radiation patterns of two-slot array antenna on a concentric sectoral cylindrical resonator for single sector are illustrated. The location of the coupling slot is considered to find the appropriate radiation pattern. The results provide useful information for the design of switched-beam array antenna on the concentric sectoral cylindrical resonators.
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Impedance Characteristic Analysis of an Axial Slot Antenna on a Sectoral Cylindrical Cavity Excited by a Probe Using Method of Moments
(2003-01-01)
Wongsan, Rangsan
;
Phongcharoenpanich, Chuwong
;
Krairiksh, Monai
;
Takada, Jun Ichi
This paper presents the analysis of the impedance characteristics of a sectoral cylindrical cavity-backed axial slot antenna excited by a probe. The integral equations are derived based on boundary conditions of the proposed structure and they are expressed in terms of dyadic Green functions and unknown current densities. The dyadic Green functions are obtained by using the eigenfunction expansion method together with application of scattering superposition techniques. The unknown current densities are solved by the Method of Moments. The input impedance is subsequently determined from the unknown electric current density at the probe. Numerical results of input impedance and return loss are demonstrated as functions of frequency for various parameters such as cavity length, cavity radius ratio, slot location in φ direction, slot length and probe length. Calculated results are validated by the measurements. At the operating frequency, it is found that the result is sufficiently accurate. The results from this study are very useful for the design of a sectoral cylindrical cavity-backed axial slot array antenna excited by a probe with omnidirectional beam radiation.

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