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Compact tri-band bandpass filter with two closely frequency spaced passbands

Author

Listed:
  • Yao Zhang
  • Xiao-Lan Zhao

Abstract

A compact tri-band bandpass filter based on a novel six-mode resonator is proposed. The filter has three passbands centered at 2.45, 5.2, and 5.8 GHz for WLAN applications. Among them, two closely frequency-spaced passbands with a small center frequency ratio (1/1.11) are realized. The 3 dB bandwidth of the two passbands are 5.8 and 5.2%, which means they have equal absolute bandwidth. Source-load-coupling structure is adopted to enhance the high-isolation performance. And the filter has six transmission zeros, resulting in high-frequency selectivity. The passband frequencies and bandwidths of the filter can be controlled. The measured results are in good agreement with electromagnetic simulation. Its circuit only occupies 0.14 λg × 0.09 λg (11.2 mm × 7.1 mm), where λg is the guided wavelength at the lowest passband center frequency.

Suggested Citation

  • Yao Zhang & Xiao-Lan Zhao, 2017. "Compact tri-band bandpass filter with two closely frequency spaced passbands," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 31(1), pages 82-90, January.
    • Handle: RePEc:taf:tewaxx:v:31:y:2017:i:1:p:82-90
    DOI: 10.1080/09205071.2016.1270231
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