FR-4 Embedded UWB Filter using Uniform Impedance Resonator
In this paper, a novel embedded ultra wideband (UWB) band-pass filter is presented on a FR-4 package substrate including high Dk resin coated copper (εr=30) film. The proposed UWB filter is comprised of a parallel resonator with meander-type uniform impedance resonator (UIR) and two series resonators with high Q circular stacked spiral inductor and metal-insulator-metal (MIM) capacitor. In order to obtain excellent attenuation characteristics by generating attenuation poles in lower and upper stop bands, a single MIM capacitor is added to each resonator. The fabricated FR-4 embedded UWB filter has insertion loss of -l.0㏈ and return loss of -11㏈, respectively. It has also extremely wide bandwidth (over 50%) and small size (3.7 × 4 × 0.77 ㎣) which is compatible with LTCC devices.
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