RF MEMS based tunable bowtie shaped substrate integrated waveguide filter

• Main Authors: Rehman, M.Z.U., Baharudin, Z., Zakariya, M.A., Khir, M.H.M., Jilani, M.T.
• Format: Article
• Published: Czech Technical University 2015
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928392901&doi=10.13164%2fre.2015.0025&partnerID=40&md5=090175a46aa4be943c80c8af71db0631; http://eprints.utp.edu.my/26112/
• Institution: Universiti Teknologi Petronas

A tunable bandpass filter based on a technique that utilizes substrate integrated waveguide (SIW) and double coupling is presented. The SIW based bandpass filter is implemented using a bowtie shaped resonator structure. The bowtie shaped filter exhibits similar performance as found in rectangular and circular shaped SIW based bandpass filters. This concept reduces the circuit footprint of SIW; along with miniaturization high quality factor is maintained by the structure. The design methodology for single-pole triangular resonator structure is presented. Two different inter-resonator couplings of the resonators are incorporated in the design of the two-pole bowtie shaped SIW bandpass filter, and switching between the two couplings using a packaged RF MEMS switch delivers the tunable filter. A tuning of 1 GHz is achieved for two frequency states of 6.3 and 7.3 GHz. The total size of the circuit is 70 mm � 36 mm � 0.787 mm (L � W � H).