Dual-Band Ring Coupler Based on the Composite Right/Left-Handed Folded Substrate-Integrated Waveguide

作者：Chi Pei Ling^*; Chen Tse Yu

来源：IEEE Microwave and Wireless Components Letters, 2014, 24(5): 330-332.

DOI：10.1109/LMWC.2014.2309087

• Composite right/left-handed (CRLH)
• dual-band
• folded substrate-integrated waveguide (FSIW)
• ring coupler

In this letter, a dual-band ring coupler based on the folded substrate-integrated waveguide (FSIW) is proposed. The artificial structure, the composite right/left-handed (CRLH) transmission lines were implemented in the FSIW by loading the interdigital capacitors in the middle metallic layer to generate a left-handed passband region below the cutoff frequency of the ordinary waveguide mode for coupler miniaturization. The FSIW is the folded counterpart of the substrate-integrated waveguide (SIW) and thus can prevent the CRLH transmission lines from radiation loss by shielding the interdigital capacitors in the waveguide. Besides, the FSIW-based coupler is able to eliminate the electromagnetic interference (noise) with adjacent objects and lend itself to multilayer circuit integration. A ring coupler that operates at 4.3 and 7.6 GHz was developed and experimentally verified. To the best of the authors%26apos; knowledge, it is the first time that a dual-band rat-race was implemented and reported based on the CRLH-FSIW structure.

• 出版日期2014-5