Digital radio broadcasting frequency hairpin filter design Using FR4 and ROGER4003C

Abstract

The development of the frequency bands in microwave range filter play important role in many RF or microwave applications. Filters are two port networks used to control the frequency response in an RF or microwave system by allowing transmission at frequencies within the pass-band of the filter, and attenuation within stop-band of the filter. This research project consist of the elementary principle of microwave theory, the elementary knowledge of microwave filter design as well as design, fabrication and performance evaluation of Chebychev bandpass filters. The purpose of the research project is to compare the compatible micro-strip filters design andthe material used in the layout designs in order to get the better performance of the filter. The micro-strip filter design in this research project use the insertion loss method to produce the parallel coupled quarter wavelength resonator filters. The compatible filter mentioned in this project able to filter out the required frequency for “Digital Radio Broadcasting” in the range of 1.452 GHz to 1.492 GHz. The designs were implemented using the development simulation software “Microwave Office 2003 (V6.01)”. Different prototypes of the Chebychev band-pass filters are obtained, for hairpin line band-pass filter. The filters were fabricated on the two different types of substrate material, which is FR4 epoxy glass and the ROGER4003C material. The entire filters design and the performances of the substrate materials to the designs are contrasted. The bandwidth for FR4 hairpin filter design differs from the ROGER4003C hairpin design. In term of scattering parameters for S11 and S22 the ROGER4003C micro-strip filter design shown low loss condition compared with FR4 filter design results. Hence, ROGER4003C produce the better performance for the micro-strip filter design.