Multiband Compact Resonator using Dual Composite Right/ Left handed Transmission Line (D-CRLH TL)

Abstract

Currently, there is strong and increasing interest from industry for a single transceiver system to cover multiple frequency bands such as Wireless bands, and mobile cellular systems. As one of the most important front-end components, multi-band band-pass filters (BPFs) with compact size, planar configuration, and good performance have been investigated aggressively and substantial progress has been achieved. Design and implement compact resonator with via free to be used for multi band wireless application. The dual

composite right left handed unit cell will improve the compactness and introduces multi- band configuration.

In this project two designs are introduced, the first design presents for the first time quad band BPF based on coupling between dual composite right/left handed transmission line and Composite right left hand transmission line. Where that the D-CRLH is responsible for the higher resonant frequencies and the CRLH is responsible for lower resonant frequencies. The four resonance frequencies are at 3.9 GHz, 4.6 GHz, 6.2 GHz and 7.1 GHz. The two designs are simulated, fabricated with compact size (16.5*14.6mm2 ). The second design presents for the first time, a new compact multiband resonator based on tuning of interdigital capacitor with Composite Right/Left-Handed (CRLH) transmission line cell with controllable frequencies and high selectivity. The operating frequencies of the resonator are 2.7GHz, 4 GHz, and 10.5GHz with insertion loss 3 dB, 1.3 dB and 1.7 dB, respectively. Furthermore, the proposed design has good matching of return losses that are equal to 14 dB, 12 dB, and 23 dB respectively. This proposed resonator is designed on Rogers 4350B material with dielectric constant 3.48 and thickness 1.524 mm. This resonator is introduced to fulfill compactness of modern technology with perfect size reduction (16.5x8.9 mm2 ). The resonator consists of CRLH unit cell connected with patch capacitor and interdigital capacitor that tune the design and provides the third band.