Abstract
In this paper, a new bandpass filter is designed using two open-loop resonators with polygonal forms. The use of polygonal forms leads to compact size and broad bandwidth behavior. The overall filter dimensions are 8×16 mm2, which correspond to 0.4λg × 0.2λg using a substrate with Rogers Ro 3010 with a relative permittivity of 10.2 and a thickness of 1.5 mm. The resulting filter exhibits enhanced passband behavior with two transmission zeros. The resulting passband has a centre frequency of 2.40 GHz, and a bandwidth of 230 MHz and fractional bandwidth (FBW) of 10%, with return loss of about −26 dB and insertion loss equal to −0.8 dB. The locations of the two transmission zeros are at 2.176 GHz and 2.638 GHz, which means that there is a sharp cut before and beyond the passband. The simulation and performance evaluation of the proposed filter were carried out using Microwave Studio Suite (MWS) Computer Simulation Technology (CST). The resulting performance of the proposed filter makes it very desirable for Bluetooth and WLAN applications (IEEE 802.11n).
Highlights
The tremendous development that has occurred in modern wireless equipment has stimulated design of low-profile compact microstrip filters, especially in terms of the design of bandpass filters
A Compact Bandpass Filter was introduced in this paper as a new approach to promote compactness in a microstrip bandpass filter based on a polygonal open-loop resonator
Simulation results show that this filter possesses a reasonable input reflection coefficient and insertion loss as well as offering overall filter dimensions of 8×16 mm2
Summary
The tremendous development that has occurred in modern wireless equipment has stimulated design of low-profile compact microstrip filters, especially in terms of the design of bandpass filters. Keywords - open-loop-resonator, microstrip bandpass filter, multiband BPF
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