Conformal strip excitation of dielectric resonator antenna

A new excitation scheme that employs a conducting conformal strip is proposed for dielectric resonator antenna (DRA) excitation. The new excitation scheme is successfully demonstrated by using a hemispherical DRA whose exact Green function is found using the mode-matching method. The moment method is used to solve the unknown strip current from which the input impedance is obtained. Novel recurrence formulas were obtained so that the impedance integrals are evaluated analytically. This solves the singularity problem of the Green function and substantially reduces the computation time. An experiment was carried out to verify the theory. The co- and cross-polarized field patterns are also shown. In addition, an experimental technique which deals with the problem of an air gap between the DRA and the ground plane is presented.

[1]  Edward K. N. Yung,et al.  Cross-polarization characteristics of a probe-fed hemispherical dielectric resonator antenna , 1999 .

[2]  Zhipeng Wu,et al.  Circular polarised cylindrical dielectric resonator antenna , 1996 .

[3]  Kwok Wa Leung,et al.  Aperture-coupled dielectric resonator antenna with a perpendicular feed , 1997 .

[4]  Kwai-Man Luk,et al.  FDTD analysis of probe-fed cylindrical dielectric resonator antenna , 1998 .

[5]  Ahmed A. Kishk,et al.  Input impedance of dielectric resonator antennas excited by a coaxial probe , 1994 .

[6]  Y.M.M. Antar,et al.  Theoretical investigation of aperture-coupled rectangular dielectric resonator antenna , 1996 .

[7]  Stuart A. Long,et al.  Rectangular dielectric resonator antenna , 1983 .

[8]  R. Harrington.  Time-Harmonic Electromagnetic Fields , 1961 .

[9]  Edward K. N. Yung,et al.  Low-profile circular disk DR antenna of very high permittivity excited by a microstripline , 1997 .

[10]  A. Ittipiboon,et al.  Circularly polarised dielectric resonator antenna , 1994 .

[11]  Excitation of dielectric resonator antenna using a soldered-through probe , 1997 .

[12]  Kin-Lu Wong,et al.  Input impedance of inclined printed slot antennas and inclined-slot-coupled dielectric resonator antennas , 1996 .

[13]  Ahmed A. Kishk,et al.  Input impedance of aperture-coupled dielectric resonator antennas , 1996 .

[14]  Stuart A. Long,et al.  The resonant cylindrical dielectric cavity antenna , 1983 .

[15]  Kwai-Man Luk,et al.  Theory and experiment of a coaxial probe fed hemispherical dielectric resonator antenna , 1993 .

[16]  Ahmed A. Kishk,et al.  Dielectric resonator antenna using aperture coupling , 1990 .

[17]  Theory and experiment of a rectangular slot on a sphere , 1998 .

[18]  K.-L. Wong,et al.  Analysis of a hemispherical dielectric resonator antenna with an airgap , 1993, IEEE Microwave and Guided Wave Letters.

[19]  Kwai-Man Luk,et al.  Theory and experiment of an aperture-coupled hemispherical dielectric resonator antenna , 1995 .

[20]  Stuart A. Long,et al.  Resonant hemispherical dielectric antenna , 1984 .

[21]  A. Ittipiboon,et al.  A half-split cylindrical dielectric resonator antenna using slot-coupling , 1993, IEEE Microwave and Guided Wave Letters.

[23]  D. Kajfez,et al.  Effect of fabrication imperfections for ground-plane-backed dielectric resonator antennas with coaxial excitation , 1994, Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 1994].

[24]  Stuart A. Long,et al.  Coplanar waveguide excitation of dielectric resonator antennas , 1991 .

[25]  Stuart A. Long,et al.  Microstrip transmission line excitation of dielectric resonator antennas , 1988 .

[26]  A.A. Kishk,et al.  Analysis of dielectric-resonator antennas with emphasis on hemispherical structures , 1994, IEEE Antennas and Propagation Magazine.