Dipole Antenna Based on Forward-Coupling Multilayer Ring Resonators (MRR)

This paper presents novel compact dipole antennas based on forward-coupling configuration of multilayer ring resonators (MRR) structure. The antenna consists of two conductive square open loops. The frequency of operation can be varied through the coupling between the two rings. This is achieved by changing the distance between the two radiating elements. Hence, these types of antennas are simply tunable. The structure is so versatile that a class of new antennas can be developed using this technique. The radiation pattern is bidirectional with a peak gain of 2.8 dBi. A good impedance matching and return loss better than 35 dB are obtained. Simulations have been carried out and the S-parameters, VSWR and radiation patterns are presented.