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Design of a radial line slot antenna with improved input VSWR

1988; Wiley; Volume: 71; Issue: 9 Linguagem: Inglês

10.1002/ecja.4410710909

8756-6621

Makoto Ando, S. Ito, Hideji Kawasaki, N. Goto,

Microwave Engineering and Waveguides

Abstract A radial line slot antenna is a planar antenna which in principle has high efficiency. An excellent efficiency of no less than 57 percent has been measured in the 12‐GHz band. To realize the predicted 80 percent efficiency, reflection in the antenna feeding structure should be suppressed. In this paper, field analysis by means of the finite element method (FEM) provides the shapes of the feeding structures which minimize the reflection. Numerical results predict that the antenna overall reflection can be suppressed to less than ‐15 dB. The theoretical design is confirmed by the model experiments in 6‐GHz band. The optimum design reduces the efficiency degradation due to reflection from 15 to 3 percent.