A LTCC-based Ku-band 3D bandpass filter using stepped-impedance hairpin resonators

Abstract

A new compact bandpass filter using stepped impedance (SI) hairpin resonators with multilayer configuration based on LTCC technology for Ku-band application is proposed. Two pairs of transmission zeros are achieved by introducing the cross coupling and asymmetric I/O structure, which can improve the rejection in the stop band. The compact filter is designed as a three-dimension structure which is embedded in the ceramic substrate based on the LTCC multilayer manufacturing technology. EM simulator HFSS is applied to design and optimize the proposed structure. The result shows a center frequency of 15.75 GHz with a bandwidth of 400 MHz. The insert loss is smaller than 2.1 dB, and the return loss is better than 18 dB within the passband. The overall dimension of the proposed filter is 4mm × 7.5mm × 1.056mm, about Ȝ g /2 × Ȝ g , which is suitable for the application in Ku-band integrated RF front end module.

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

“…The improved BPF has a size of 6 3 6 mm 2 (including 50-X feed lines), which is compact amounting to approximately 0.52k g 3 0.52k g , where k g is the guide wavelength at 17 GHz. Comparing with other similar works presented in the Table 1 [8][9][10], 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…”

Compact Microstrip Narrow Bandpass Filter With Good Selectivity and Wide Stopband Rejection for Ku-Band Applications

“…To achieve this goal, the Ku-band bandpass filters have become one of the most important circuit components. There are many methods proposed to design Ku-band bandpass filters [1][2][3][4][5][6][7][8][9][10].…”

“…The substrate integrated waveguides provide easy integration of planar circuits with the waveguide, while still maintaining low loss and high power handling capability of the waveguide. Due to these advantages, a variety of RF bandpass filters have been realized using SIW technology [2,3]. In [2], a novel compact Ku-band bandpass filter based on substrate integrated circular cavities is proposed.…”

“…However, the selectivity of the filter is not ideal because of no transmission zeros. In [3], a new compact bandpass filter using stepped impedance hairpin resonators with multilayer configuration based on low temperature co-fired ceramic technology for Ku-band application is presented. Two pairs of transmission zeros are achieved by introducing the cross coupling and asymmetric I/O structure, which can improve the performance of the filter.…”