Tunable Combline Bandpass Filter

Nazirah , Zainal Abidin (2008) Tunable Combline Bandpass Filter. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This project presents the design of tunable combline bandpass filter. Nowadays, common filter are fixed at certain frequency, so it will be fixed for the fixed applications. To overcome these limitations, electronically tunable filters with fast tuning speed and narrow bandwidth are required for many applications including electronic surveillance system and some wireless communications systems that use multi-channels. In this work, integrated tunable filters using microstrip line resonators are investigated. Filters with low loss, high tunability and small size are designed. The design is based on the combline regarding to the Chebyshev response. The initial procedure involves the development of a low pass prototype with cross couplings between non-adjacent resonators. This frequency is presenting for wireless LAN application and operates in the ISM (In~ustrial, Scientific and Medical) band which is covering from 2.4 GHz to 2.4835GHz. There are several steps to design this filter that are including by determine filter specifications, order of filter, low pass filter prototype elements, low pass to band pass transformation, physical dimension (width, spacing, length) and wavelength guide .. The explanation details for design procedure, simulated results, methods and techniques are discussed in this report.

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