Abstract
Metamaterials are artificial structures that can be designed to exhibit specific electromagnetic properties that are not in the nature. In this paper, we design a directional coupler, based on the theory of the split-ring resonators (SRRs), and the complementary SRR (CSRRs). The experiments and simulations of the directional coupler are based on the theory of the square structure (and not based on the circular structure) of the SRR and CSRR. The advantage of this circuit is that the area of the coupling is great as regards to the coupler based on the circular structure. The results of simulation and measurement with the miniature structures show the backward-wave phenomenon of the left-handed (LH) material.
Highlights
In the recent years, artificial metamaterials have been a subject of growing interest, in the microwave and antenna regimes
The experiments and simulations of the directional coupler are based on the theory of the square structure of the split-ring resonators (SRRs) and complementary SRRs (CSRRs)
The advantage of this circuit is that the area of the coupling is great as regards to the coupler based on the circular structure
Summary
Artificial metamaterials have been a subject of growing interest, in the microwave and antenna regimes. A novel backward directional coupler, composed of a conventional microstrip line and composite right/left-handed (CRLH) line, was proposed by Caloz, et al (Caloz et al, 2004) This coupler was functionally backward but it is based on a forward-type coupling phenomenon. Contra-directional power flow in the coupler has been indicative of left-handedness in the backward transmission line, which has been artificially fabricated by means of complementary SRRs (CSRRs), etched in the ground plane, and an array of T-shaped capacitive elements, etched in the conductor strip. The objective in this paper is to design coupler based on the theory of the SRR and CSRR in the case of the miniature structures in order to understand about the backward-wave phenomenon of the LH material. The backward-wave phenomenon of the LH material is very interesting
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