A composite right/left-handed transmission line resonator with 3 unit cells is fabricated and its radiation loss is investigated. At the zeroth order resonance state, the resonator shows radiation loss, which is dominant over other conductor and dielectric losses. This paper investigates the radiation loss of zeroth order resonators from a quality-factor point of view. With the use of a metal shield, the quality factor is considerably increased through a reduction of the radiation loss. The increase in the quality factor is explained by means of the extracted parameters of the equivalent circuit model.
2. Sanada, A., C. Caloz, and T. Itoh, "Novel zeroth order resonance in composite right/left-handed transmission line resonators," Asia-Pacific Microwave Conf., Vol. 3, 1588-1592, Seoul, Korea, Nov. 2003.
3. Lai, A., K. M. K. H. Leong, and T. Itoh, "A novel N-port series divider using infinite wavelength phenomena," IEEE MTT-S Int. Microwave Symp., 1001-1004, Long Beach, USA, June 2005.
4. Belohoubek, E. and E. Denlinger, "Loss considerations for microstrip resonators," IEEE Trans. Microwave Theory and Tech., Vol. 23, 522-526, June 1975.
doi:10.1109/TMTT.1975.1128615
5. Sobol, H., "Radiation conductance of open-circuit microstrip," IEEE Trans. Microwave Theory and Tech., Vol. 19, 885-887, Nov. 1971.
6. Caloz, C. and T. Itoh, Electromagnetic Metamaterials:T ransmission Line Theory and Microwave Application, Wiley-Interscience, New York, 2005.
7. Dunleavy, L. P. and R. Wenzei, "Use of EM analysis to study shielding effects in microstrip circuits," Southcon/94 Conference Record, 282-287, 1994.
8. Bedair, S. S. and M. I. Sobhy, "Accurate formula for computer-aided design of shielded microstrip circuits," IEE Proc., Vol. 127, 305-308, 1980.
9. Kajfez, D., S. Chebolu, M. R. Abdul-Gaffoor, and A. A. Kishk, "Uncertainty analysis of the transmission-type measurement of Q-factor," IEEE Trans. Microwave Theory and Tech., Vol. 47, No. 3, 367-371, Mar. 1999.
doi:10.1109/22.750244
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