Design Of S-band Microstrip Bandpass Filter For S-Band Application

Arief, Mostapah (2013) Design Of S-band Microstrip Bandpass Filter For S-Band Application. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

S-Band is range of frequency from 2GHz to 4GHz which is a part of microwave system and a partly combination between Ultra High Frequency (UHF) and Super High Frequency (SHF). There are many applications uses part of S-Band frequencies as their frequency spectrum for a specified application like the most extensive use in wireless telecommunication nowadays, Wireless Local Area network Access (WLAN) which operates at 2.4GHz, HSDPA, HSUPA, Bluetooth, WiMAX, LTE and other applications which uses part of the S-Band frequency. To satisfy the needs for many applications to be used at once, S-band microstrip bandpass filter is proposed as it functions to filter out other frequencies from the passband region using planar microstip transmission topologies. The objective of this project is to design, simulate, fabricate and analyze the bandpass filter at S-Band application. To design the prototype, certain constraints had to be identified, like lumped element works well in low frequencies but at high frequencies, problem arises. Such, the inductor and capacitors are only available for a limited range of values, and the distance between the filter components at microwave frequency is not negligible. Hence, microstrip transmission line is used to the design as it capabilities of handling wideband of fabricated. The BPF will be designed using parallel coupled line method and hairpin line method which will be simulated using ADS Simulation, fabricated using FR-4 substrate, and analyzed using network analyzer. The design is compared between the ideal case design, parallel-coupled line design, and hairpin line design for its S11 and S21 values. The result gives out a good agreement between the simulation and measured values. The best technique for the BPF design in this project is by using parallel coupled line method which gives out -14.591dB, -4.8903dB for S11 and S21 respectively. In terms of size and compact structures, hairpin design is preferable.

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