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A MINIATURIZED BANDPASS FREQUENCY SELECTIVE SURFACE WITH HIGH SELECTIVITY BASE ON SLOT COUPLING
摘要： A Ku-band bandpass frequency selective surface (FSS) with high selectivity and miniaturization is proposed in this paper. We use two metallic strips and one slot to design the frequency selective surface structure which contains both electrical and magnetic couplings. A metallic via is introduced in the FSS element for miniaturization. With the via inserted at the end of the metallic strip, the FSS unit size is reduced to half compared to that without via inserted. To investigate the operating principle of the slot-coupled FSS, an equivalent-circuit model is given and analysed using the odd- and even-mode method. The constructed out-of-phase signal path causes two transmission zeros (TZs) near the skirts of the narrow pass band, thereby enhancing the selectivity. A prototype of the proposed FSS operating at 16 GHz is fabricated and measured. The measured results agree well with the full-wave and circuit simulation results, thus verifying the FSS design.
关键词： slot coupling,Ku-band,bandpass frequency selective surface,metallic via,high selectivity,equivalent-circuit model,transmission zeros,miniaturization
更新于2025-09-09 09:28:46
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Ultra-Wideband Harmonic-Suppressed Bandpass/stop Frequency-Selective Surface Based on L-C Lumped Elements
摘要： Ultra-wideband harmonic rejection bandpass and bandstop frequency-selective surfaces (FSS) based on L-C lumped elements are proposed. The bandpass response is achieved by parallel combination of LC resonant circuit. While is accomplished by series combination. Detailed analysis with the aid of an equivalent circuit models is provided to explain the operating principles and parasitic effects for both FSSs. Bandwidths of 19:1 and 24.5:1 harmonic rejection are achieved between the fundamental frequency and the first harmonic for bandpass and bandstop FSSs, respectively. Controllable resonant frequency and bandwidth are possible by controlling the lumped element’s value. To validate the simulated results, a bandpass FSS prototype is fabricated and measured. It is shown that this methodology is suitable for low frequencies due to the parasitic capacitor associated with the lumped inductor at high frequencies and the change of the component’s value with frequency.
关键词： lumped components,Bandpass frequency-selective surface,Bandstop frequency-selective surface,ultra-wideband harmonic suppression,dual-polarization
更新于2025-09-04 15:30:14