Compact microstrip bandpass filter with tunable notch

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Abstract

Two different designs combining a bandpass and a notch filter are developed to operate in the receiving band from 350–470 MHz. The bandpass filter is designed from a simple structure, by use of only four short circuited stubs and a half wavelength transmission line connecting the stubs. The tunable notch filter ensures an attenuation level of 19.3 dB to 27.3 dB in the frequency range from 360–480 MHz. The measured passband ripple of the combined filter is less than 0.5 dB, while the insertion loss for the simplest design is less than 1.7 dB only 10 MHz from the notch frequency. Even though the wavelength on the selected substrate (εr = 3.55) is approximately 45 cm, the outer dimensions of the final filter only measure 10×10 cm2.
Original languageEnglish
Title of host publicationProceedings of 2014 20th International Conference on Microwaves, Radar, and Wireless Communications
Number of pages4
PublisherIEEE
Publication date2014
ISBN (Print)9786176075530
DOIs
Publication statusPublished - 2014
Event2014 20th International Conference on Microwaves, Radar, and Wireless Communications - Mercure Hotel, Gdansk, Poland
Duration: 16 Jun 201418 Jun 2014

Conference

Conference2014 20th International Conference on Microwaves, Radar, and Wireless Communications
LocationMercure Hotel
CountryPoland
CityGdansk
Period16/06/201418/06/2014

Keywords

  • Aerospace
  • Communication, Networking and Broadcast Technologies
  • Components, Circuits, Devices and Systems
  • Fields, Waves and Electromagnetics
  • Photonics and Electrooptics
  • Signal Processing and Analysis
  • Attenuation
  • Band-pass filters
  • Bandwidth
  • Capacitors
  • Couplings
  • Microstrip
  • Passband

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