A UWB BPF BASED ON A CAPACITIVELY COUPLED CROSS RESONATOR

作者：Duong Thai Hoa^*; Kim Ihn S

来源：Microwave Journal, 2010, 53(9): 140-+.

This article introduces a novel ultra-wideband (UWB) bandpass filter (BPF) with sharp roll-off characteristics in a stripline structure. The UWB characteristic is basically obtained from a capacitive coupled cross resonator that has a lambda/2 length. At the center of the resonator two stubs are loaded; one is a lambda/8 short-circuited stub and the other is a lambda/8 open-circuited stub. The two stubs provide two attenuation poles at lower and upper cut-off frequencies. For input and output lines, two identical capacitively coupled lines have been installed to suppress the unwanted signals in the lower and upper stop-bands. The filter has been designed for the US UWB band (3.1 to 10.6 GHz) with two transmission zeros at 2.4 and 11.1 GHz. An insertion loss less than 0.7 dB and a return loss better than 14 dB have been measured in the passband. The group delay at the center frequency is 0.27 ns and the group delay variation within the passband is less than 0.5 ns. The size of the filter is 6 X 18 X 0.6 mm.

• 出版日期2010-9