A compact ultra-wideband (UWB) bandpass filter (BPF) with wide passband using defected ground structure (DGS) is proposed. The proposed UWB filter is constructed by cascading a high pass filter (HPF) and a lowpass filter (LPF). HPF with short-circuited stubs is used to realize the lower stopband and a LPF is used to attenuate the upper stopband. In order to make the filter size compact, DGS tec...

Compact and wide stopband lowpass filter with high suppression level using corrugated high impedance transmission line with symmetrically loaded multiple patch resonators is designed and demonstrated. The measured results validate the simulated characteristics and exhibit a roll-off of 60 dB/GHz and a wide stopband with suppression level better than 31 dB from 2.65 GHz to 13.4 GHz. The 3 dB cut...

A branch line coupler (BLC) with ultra-compact size and harmonic suppression ability using an LCL filter meandered stubs is proposed in this paper. There are some important factors microstrip design, including reduction, suppression, low insertion loss. Thus, improving each of these will contribute to a more efficient design. In the circuit, for first time, filters, four T-shaped circuits open-...