DESIGN OF MICROSTRIP MULTIBAND BANDPASS FILTERS AND IMPLEMENTATION USING SIRS

In this paper a simplified technique is used to design multiband bandpass filters using a compact Ultra Wide Band (UWB) microstrip. Analysis in a typical dispersion diagram is convenient for distinguishing unbalanced mode and balanced mode from transmission line. This filter is on the base of the design of the dualband filter of 2.4 GHz, 3.7 GHz and then dualband filter 2.4 GHz and 5 GHz. In the proposed filter the double coupling technique has been used to increase bandwidth, the low impedance piece is surveyed because of the creating double zero in this area, and the stopband profile is improved. These transmission frequencies show us that the intended plan is effective for all plans.