Dual-frequency double-ring microstrip antenna with voltage/current couplings

Abstract

A novel design of a double‐ring microstrip antenna with dual‐frequency operation is presented in this paper. The frequency ratio (FR) depends on the radii of the inner and outer rings. Besides the voltage feed line couples to the outer rings, the current coupling between these two rings is introduced. Experimental results are presented and discussed. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 209–211, 1999.

Dual‐mode double‐ring resonator for microstrip band‐pass filter design

“…According to the frequency selective surface (FSS) techniques [1,14,15], two resonated frequencies with respect to the double rings (shown in Fig. 2) are applied to determine the dual frequencies of the desired band [17].…”

“…The effects of the coupling techniques were discussed in [1,5,6,8,[12][13][14]. In addition to the illumination method used in the FSS techniques [15], the coplanar voltage/current couplings were applied to excite the double ring [17].…”