Ku-band filters using open-loop and quarter-wavelength resonators based on LTCC technology

Abstract

A novel Ku-band single layer bandpass filter using open-loop and quarter-wavelength resonators based on LTCC technology is proposed. A pair of transmission zeros is introduced by the cross coupling, which can improve the attenuation near the passband. The size of the filter is about 6mm × 6mm × 0.288mm, about 0.75 g × 0.75 g . To reduce the filter's size, a modified filter with multilayer structure is designed. It has a center frequency of 15.4 GHz with bandwidth of 800 MHz, a size of only 0.75 g × 0.5 g . After verification, these filters are suitable for the Ku-band integrated RF front end.

Ku‐band compact bandpass filter with wide upper stopband using multilayer liquid crystal polymer technology

“…The improved BPF has a size of 6 × 6 mm 2 (including 50‐Ω feed lines), which is compact amounting to approximately 0.52 λ g × 0.52 λ g , where λ g is the guide wavelength at 17 GHz. Comparing with other similar works presented in the Table , it is shown that the improved BPF in this work has better rejection at upper stopband and smaller size.…”

“…Measured results show the improved BPF have good selectivity and wide stopband, so that it can be used for wireless communication and radar applications. [9] 2.54% -0.5k g by k g [10] 5.2% 16-38 GHz 0.75k g by 0.5k g This work 17.3% 22.6-50 GHz 0.53k g by 0.53k g…”