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J. Electromagn. Eng. Sci > Volume 13(4); 2013 > Article
Journal of Electromagnetic Engineering and Science 2013;13(4):263-266.
DOI: https://doi.org/10.5515/JKIEES.2013.13.4.263   
A Novel Compact Metamaterial Zeroth Order Resonant Bandpass Filter for a VHF Band and Its Stopband Improvement by Transmission Zeros
Sungtek Kahng, Geonho Jang
Department of Information & Telecommunication Engineering, Incheon National University
A novel compact and low-loss VHF bandpass filter is presented with enhanced stopband performance using metamaterial zeroth order resonator (ZOR) characteristics. An in-line ZOR filter is initially suggested and changed to have transmission zeros (TZs) due to source-load coupling for effective improvement of the isolation from UHF wireless channels. The proposed filter is smaller than 1/10 of the conventional filters in terms of size and has relatively very low insertion loss (< 1 dB for the electromagnetic (EM) simulation and < 3 dB for the measurement) and return loss (<-20 dB) in the passband due to the approximately 80% size reduction and the higher isolation in the stopband due to the TZs. The circuit and EM simulation are in good agreement with the measurements.
Key words: Bandpass Filter, Metamaterial, Transmission Zero, VHF, Zeroth Order Resonance
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