A compact UWB band-pass filter with a notch band using multi-mode stub-loaded resonators (MM-SLR)

摘要: In this paper, an ultra-wideband (UWB) band-pass filter (BPF) with a sharp notch band is presented. The UWB BPF consists of modified elliptical-ring and multi-mode stub-loaded resonator (MM-SLR). By adding the asymmetric tight coupled lines via input/output (I/O) lines, it can be achieved response. With two bends to middle resonator, at 6.86 GHz created, so that controlled using mathematical formulas (MF). meantime, equivalent circuit obtained L–C analysis. Measured results fabricated have advantage such as ultra-wide pass (fl fH defined are 3.776 10.42 GHz, which satisfy requirements FCC-specified limits), compact size, low insertion loss <0.65 dB stop proposed from 11.1 16.32 attenuation −39.8 −42.14 dB, respectively. realized substrate dielectric constant 2.2 height 0.787 mm. Experimental verification provided good agreement has been found between simulation measurement results.