Design Of Multi-Band Bandpass Filter For Next Generation Wireless System

Lee, Kah Weng (2015) Design Of Multi-Band Bandpass Filter For Next Generation Wireless System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project presents the design of multi-band bandpass filter using microstrip with Defected Microstrip Structure (DMS) to produce bandpass and band reject characteristics simultaneously. This class of filter is designed based upon λ_g0/4 short-circuited stubs structure of 7th degree. The integrated multi-band BPF and DMS produce 3 wideband bandpass and 2 band reject response simultaneously in order to remove any undesired signals in the passband of the bandpass response with S11, better than -20dB and insertion loss, S21, of around -1dB respectively. The DMS exhibits two band-reject responses better than -20dB and forms first band 2.3GHz-2.7GHz, second band. 1GHz-4.8GHz and third band 5.15GHz-5.85GHz. This design is simulated on a Roger Duroid RO4350 with a dielectric constant, ε_r of 3.48 and a thickness of 0.508 mm while the loss tangent is 0.0019. The theoretical, simulated and measured results were obtained and demonstrated in this thesis. This type of filter is useful in any RF/ microwave communication systems such as Worldwide Interoperability for Microwave Access (WiMAX) and wireless UWB tracking system.

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