Notched-wideband Bandpass Filter Based on Spoof Surface Plasmon Polaritons Loaded with Resonator Structure

• Published in: Plasmonics (Norwell, Mass.) Vol. 18; no. 1; pp. 165 - 174
• Main Authors: Sun, Shupeng, Cheng, Yongzhi, Luo, Hui, Chen, Fu, Li, Xiangcheng
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2023; Springer Nature B.V
• Subjects: Bandpass filters; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Broadband; Chemistry; Chemistry and Materials Science; Circuit boards; Circuit design; Design; Frequency ranges; Ground plane; LC circuits; Nanotechnology; Polaritons; Printed circuits; Resonators; Substrates; Transmission lines; Bandpass filter (BPF); 山-shaped resonator; Spoof surface plasmon polaritons (SSPPs); Notched-wideband (NWB)
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-022-01755-z

In this paper, a notched-wideband (NWB) bandpass filter (BPF) based on the spoof surface plasmon polaritons (SSPPs) with loaded resonator structure is proposed in microwave region. The design of the NWB BPF consists of a U-shaped SSPPs transmission line embedded with 山-shaped resonator structures, dielectric substrate, and metal ground-plane. The loaded 山-shaped resonator structure was used to generate the transmission zero in a wideband range. The dispersion and transmission properties of the designed NWB BPF are analyzed and compared with the U-shaped SSPP wideband BPF. The simulation results indicate that the operation frequency range of the designed NWB BPF is from 4.35 to 8.12 GHz, and the notched band is from 6.2 to 6.7 GHz with over − 20 dB rejection, which are agreement well with the theoretical calculation based on the equivalent LC circuit model. By adjusting the geometric parameters of the NWB BPF, the notched band position and passband cutoff frequency can be adjusted independently. To verify the effectiveness of the designed NWB BPF, a prototype is fabricated by the traditional printed circuit board (PCB) technology. Both measurements and simulations demonstrate that the design has wide passband and notch-band transmission properties.