Analysis of Conformal and Metamaterial Based Microstrip Bandpass Filter for Wi-MAX, WBAN and ISM Band Applications

This article explored the design and implementation of rectangular split ring resonator (SRR) based microstrip bandpass filter for mobile Wi-MAX, WBAN and ISM band applications. A novel rectangular SRR based unit cell analysis with respect to permittivity, permeability, refractive index, and absorption rate are carried out using the Ansys HFSS. Flexible polyimide is used as substrate and the designed CSRR is placed in the implementation of the bandpass filter models. Initial design is of microstrip line-based radiating element with CSRR ground to operate at 3.2, 4.8, and 5.8 GHz. The second model is of SRR structure based radiating element bandpass filter to operate at 2.1, 3.9, and 5.7 GHz, respectively. The conformality of both bandpass filters across 15°, 30°, 45°, 60° and 90° bending are analyzed and found negligible variation in the performance characteristics. Prototyped microstrip bandpass filter results are measured using ANRITSU-MS2037C combinational analyser and found suitable validation with simulation results.