A Dual-Band BPF Based on Asymmetrical-Meandered Configuration for Communication Systems

In this paper, a compact dual-band bandpass filter (BPF) with a linear phase filtering response is proposed. In this filter, a rectangular loop is adopted as a resonator such that every two sides of the loop have the same configuration of meandering. The rectangular loop dimensions are 13 × 11 mm2, while the overall filter dimensions are 34.5 × 19 mm2 using a substrate having a relative permittivity of 6.15 and a thickness of 1.5 mm. The obtained results demonstrated a dual-band behavior such that a return loss of less than −32 dB and insertion loss of about −0.23 dB with a fractional bandwidth of about 12.5% centered at 2.52 GHz for lower band. Furthermore, for the higher band a fractional bandwidth of about 4% centered at 5.11 GHz with a return loss of less than −21 dB and insertion loss of about −0.9 dB. Compactness and multiband features offered by the proposed filter make it more desirable for use in the design of modern wireless communication. Performance and simulation of the designed filter have been evaluated and accomplished using the Microwave Studio Suite, CST electromagnetic simulator.