Investigation of Rectangular Dielectric Resonator Antenna Coupled by Microstrip Feed Line on Different Substrates and Offset Distances
Shok Theng Low, Zhipeng Wu
Proc. ‘EuCAP 2006’, Nice, France
1st January 0001
The simple microstrip-feed feed enables possible integration of dielectric resonator antenna (DRA) with other microwave circuits in a planar arrangement. In the past critical coupling of microstrip-coupled DRA is found during measurements by adjusting DRA-to-microstrip distance (or offset distance). No systematic study is found for other offset distances that do not result in critical coupling. The objective of the investigation presented in this paper is to provide an insight of how microstrip line could efficiently couple energy to the rectangular dielectric resonator antenna (RDRA). Parameters of the antenna under investigation include the resonant frequency, return loss, impedance bandwidth and the co- to cross-polarisation levels. These parameters are also investigated for using microstrip lines printed on RT/duroid 5880 and FR4 substrates with different thicknesses. Together with the offset distances, the choice of substrates also affects the impedance matching of the RDRA.
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