Design of Band Pass Filters using Meander Line Structure for WIMAX Applications

Abstract: A band Pass filter is a device or electronic circuitry that allows just certain frequencies to pass through while rejecting or recognising unwanted frequencies. This paper presents the design and implementation of a compact wide band-pass filter and dual-band pass filter using meander split ring open resonator and meander line structure. The most common application of band pass filters is in Radio Frequency (RF) and WiMAX applications. The micro-strip technology is adopted in all simulation and fabrication. The substrate used in the fabrication is a FR4 with dielectric constant 4.5 and thickness 1.5mm. The filter response has two transmission zeros located below and above the pass band to improve the filter selectivity due to asymmetrical locations of feeding lines. The study also suggests structural, material, and characteristic enhancement to achieve high gain, high return loss, and low insertion loss with a low ripple factor. The proposed filter has been designed, simulated, fabricated, and measured where both the measured and simulated results are in good agreement.

Keywords: Band pass filter, Meander line, WiMAX, Radio frequency.