Abstract
In this paper, a multilayer bandpass filter for ultra-wideband (UWB) technology is developed and proposed. The filter is designed to operate within a frequency range of 3.1-10.6 GHz. The fractional bandwidth FBW of the proposed filter is designed to be 110 % at a 6.85 GHz center frequency. The proposed structure is designed to have three short-circuited stubs separated by two parallel-coupled line sections. The proposed UWB bandpass filter is implemented on liquid-crystal-polymer (LCP) substrate using multilayer structures. The filter is theoretically analyzed and verified by electromagnetic simulation of the layout of the filter. In addition, the proposed filter is fabricated and measured. A very good agreement between expected and experimental performances is achieved. The measured performance shows a FBW of about 110% with a very low insertion loss.