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Author: search.filters.author.Chi, Pei-LingSubject: search.filters.subject.Composite right/left-handed (CRLH)

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Now showing 1 - 5 of 5
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    Compact and Dual-Band Arbitrary Power-Split Quadrature Coupler Using the Composite Right/Left-Handed Transmission Lines
    (2014)
    Chi, Pei-Ling
    ;
    Chang, Wen-Yuan
    ;
    資訊工程學系
    ;
    電機學院
    ;
    Department of Computer Science
    In this paper, a dual-band quadrature coupler is proposed for arbitrary power divisions using the composite right/left-handed (CRLH) transmission lines. The presented prototype is based on two identical CRLH transmission lines of 50 ohm and a pair of lumped-element parallel tanks loaded to the CRLH host lines. The power division ratio at either frequency is determined by the electrical length of the 50-Omega CRLH lines, which facilitates coupler realization of arbitrary power split, even for a large division ratio. By applying the CRLH lines, the dual operating frequencies as well as the corresponding power split ratios can be arbitrarily designed, which on the contrary is infeasible by microstrip lines. Two coupler prototypes were developed for power division ratios of 10/10 dB and 10/6 dB at 0.9/1.8 GHz. In particular, the first fabricated coupler occupies only 18% footprint of the 0.9-GHz microstrip branch-line coupler. Experimental results are in good agreement with simulation data.
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    Dual-Band Ring Coupler Based on the Composite Right/Left-Handed Folded Substrate-Integrated Waveguide
    (2014-05-01)
    Chi, Pei-Ling
    ;
    Chen, Tse-Yu
    ;
    電機資訊學士班
    ;
    Undergraduate Honors Program of Electrical Engineering and Computer Science
    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\' knowledge, it is the first time that a dual-band rat-race was implemented and reported based on the CRLH-FSIW structure.
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    Novel Dual-Band Quasi-0-dB Coupled-Line Coupler Using the Composite Right/Left-Handed Transmission Lines
    (2014-02-01)
    Chi, Pei-Ling
    ;
    Liu, Chun-Chih
    ;
    電機資訊學士班
    ;
    Undergraduate Honors Program of Electrical Engineering and Computer Science
    A novel edge-coupled symmetric coupled-line coupler featuring the quasi-0-dB couplings at adjacently dual frequencies is presented based on the composite right/left-handed (CRLH) transmission lines. The fulfillment of dual-frequency quasi-0-dB couplings is derived from the complete backward and complete forward coupling phenomena at the higher and lower operating frequencies, respectively. To this end, the dispersion relations of the even and odd-mode CRLH lines have to be engineered in a particular manner so that: 1) the substantial attenuation level for each mode; 2) the 180 degrees phase difference between the even and odd-mode reflection coefficients in the overlapped stopband region are obtained to accomplish the complete backward coupling; 3) the enabling curve intersection for the even and odd-mode Bloch impedances; and 4) the considerable difference between the even and odd-mode propagation constants in the left-handed regions are obtained to suppress the impedance coupling and attain strong forward coupling. Based on a thorough analysis on the even and odd-mode dispersion characteristics and Bloch impedances of the coupled lines, the operating principle and design procedure for the proposed coupler with dual-band complete couplings can be fully explained and greatly simplified. A symmetric CRLH coupled-line coupler consisting of seven coupled unit cells was experimentally developed and a shielding (metal) box was used to prevent radiation loss in the forward coupling band. Experimental results show that the maximum coupling levels are -1.3 and -0.9 dB, corresponding to the 3-dB fractional bandwidths of 15.8% and 10.8% at the lower and higher operating frequencies, respectively. Good agreement is obtained between the simulated and experimental results.
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    Novel Compact Partial-H Plane Filter Based on the Composite Right/Left-Handed Transmission line in Folded Substrate-Integrated Waveguide
    (2012)
    Chi, Pei-Ling
    ;
    Yang, Tao
    ;
    電機資訊學士班
    ;
    Undergraduate Honors Program of Electrical Engineering and Computer Science
    A novel compact partial-H plane bandpass filter based on the composite right/left-handed (CRLH) transmission line in folded substrate-integrated waveguide (SIW) is proposed in this paper. The proposed filter consists of four identical CRLH resonators that resonate at the negative first-order resonant mode and occupy very compact physical sizes. Furthermore, the resonators were designed to be implemented in the folded SIW structure for suppressing the inherent fast-wave radiation phenomenon of the CRLH structure. As a result, the proposed filter combines the advantages of the CRLH structure for miniaturization and the SIW for high quality factors. Therefore, the resulted filter requires much smaller size as compared to the conventional SIW partial-H plane filter while exhibiting a much higher quality factor as compared to the conventional CRLH bandpass filters. A filter prototype with center frequency at 4.8 GHz was designed, fabricated and tested to demonstrate these features. Measured results agree well with the theoretical results.
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    Compact Zeroth-Order Resonant Antenna Based on Dual-Arm Spiral Configuration
    (2012)
    Liu, Chun-Chih
    ;
    Chi, Pei-Ling
    ;
    Lin, Yu-De
    ;
    電機工程學系
    ;
    Department of Electrical and Computer Engineering
    A miniaturized and zeroth-order resonant composite right/left-handed (CRLH) antenna based on dual-arm spiral structure is presented. The proposed dual-arm spiral unit cell is able to implement and tailor the CRLH lumped elements easily in a compact fashion. Particularly, the gap coupling between the spiral arms contributes to the series capacitance C-L and the metallic via-hole at the end of one arm results in the shunt inductance L-L. The resonant frequency and thus the miniaturization factor can be simply engineered by the spiral parameters that determine the corresponding circuit elements. The proposed CRLH antenna is composed of two unit cells, each of which occupies only 0.066 lambda(0) x 0.053 lambda(0) at the operating frequency. From the experimental results, this compact antenna exhibits the dipole-like radiation patterns and has a peak gain of -0.53 dBi. The measured and simulated results are provided, and good agreement is achieved.