Design Of Wide-Band Bandpass Filter With Tunable Notch Response Of Wireless Communication System

Kuek, Soo Fang (2015) Design Of Wide-Band Bandpass Filter With Tunable Notch Response Of Wireless Communication System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 pages) Design Of Wide-Band Bandpass Filter With Tunable Notch Response Of Wireless Communication System 24 Pages.pdf - Submitted Version Download (264kB)

Abstract

A compact ultra-wideband (UWB) band-pass filter suitable for a short distance and high-rate such as UWB radar systems for military, medical and civilian is presented. However, the applicability of UWB band is limited by existing narrowband radio signals. These radio signals such as Wi-MAX at 3.5GHz and WLAN at 5.2GHz, RFID at 6.8GHz, C-band satellite communication (4GHz) and X-band applications like satellite communications (8GHz) cause the interferences with UWB communication system. This project is to design a five order tunable band-pass filter by using optimum distributed high-pass integrated with Defected Micro-strip Structure (DMS). The purpose of using DMS is to produce a band reject response. Then, pin diode is added to act as a switch to tuning the notch response. This design is simulated by ADS software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508mm and loss tangent 0.0019. The proposed UWB filters are verified by experiments and fabricated. Measurement for UWB filter implemented by using Vector Network Analyzer. When pin diode off, the passband obtained range from 2.639GHz to 10.472GHz. When the pin diode on, the pass-band obtained in the range from 2.485GHz to 9.800GHz. Both passband range obtained a return loss, S 11 better than 10 dB and insertion loss, S 21 less than 1 dB when pin diode on. DMS produces sharp band rejects response better than 20dB at a frequency of 6.8GHz and 8GHz when pin diode off. The sharp band rejects response is tuned to 4GHz with bandwidth 700MHz and 6.8GHz when pin diode on. The proposed filter has better performance for UWB application and it is able to eliminate and tuning the undesired frequency in UWB communication.

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