A compact triple-band microwave filter using symmetrically placed stub-loaded open-loop resonators

In this paper, symmetrically placed stub-loaded open-loop resonators with magnetic coupling are used to design compact triple-band band pass filter (BPF) with improved insertion loss at passbands. Three bands of the proposed triple-band stub-loaded open-loop resonator filter are achieved by tuning l...

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Bibliographic Details
Published in:International journal of electronics letters 2018-07, Vol.6 (3), p.364-375
Main Authors: Ranjan, Prashant, Tripathi, V. S.
Format: Article
Language:English
Subjects:
Airports
band pass filter
Bandpass filters
DSRC
Insertion loss
microstrip
Microwave filters
Resonators
RFID
Satellite communications
Spectrum allocation
Surveillance radar
transmission line
Transportation systems
Triple-band stub-loaded open-loop resonator (TBSLOR)
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Summary:In this paper, symmetrically placed stub-loaded open-loop resonators with magnetic coupling are used to design compact triple-band band pass filter (BPF) with improved insertion loss at passbands. Three bands of the proposed triple-band stub-loaded open-loop resonator filter are achieved by tuning length and position of open shunt stub which is connected with open-loop resonators. A lossless transmission line model is used to calculate the resonator properties. Theoretical design procedures are verified with an example of triple-band BPF design. Three passbands at 2.85, 5.9 and 8.15 GHz are achieved with reduced insertion loss. The insertion loss measured at first, second and third passbands are 0.47, 0.77 and 1.41 dB, respectively. First passband 2.76-2.9 GHz is used for the airport surveillance radar system and weather monitoring system. Second frequency band 5.82-6.16 GHz is used for the intelligent transportation system and third band 8.1-8.7 GHz is useful for satellite communication.
ISSN:2168-1724
2168-1732
DOI:10.1080/21681724.2017.1378419