A self-encapsulated ultra-wideband balanced filter based on multi-layer lcp circuit technology

Abstract

The invention discloses a self-encapsulated ultra-wideband balanced filter based on multilayer LCP circuit technology. The grounding plate, the top metal grounding plate and the middle and upper broadside coupling lines are connected through the first metal column and the second metal column, and the top metal grounding plate and the middle and lower broadside coupling lines are connected through the third metal column and the fourth metal column. For column connection, the connection between the wide-side coupling line at the middle and lower layers and the metal grounding plate at the bottom layer is connected through the fifth metal column and the sixth metal column.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a self-encapsulated ultra-wideband balanced filter based on multilayer LCP circuit technology. Background technique [0002] In recent years, due to the ability of balanced circuits to adapt to noise and electromagnetic interference (Electromagnetic interference) environments, they are widely used in modern communication systems. In particular, the balanced bandpass filter (Balancebandpass filter) has a good differential-mode signal response and can suppress common-mode signals at the same time, and has been studied by more and more scholars at home and abroad. [0003] Document 1[J. Shi and Q. Xue, “Balanced bandpass filters using center-loaded half-wavelength resonators,” IEEE Trans. Microw. Theory Techn., vol.58, no. 4, pp. 970-977, Apr. 2010] By using uniform impedance and stepped impedance resonators, the balanced circuit has a good common-mode rejection f...

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Problems solved by technology

[0003] Document 1[J. Shi and Q. Xue, “Balanced bandpass filters using center-loaded half-wavelength resonators,” IEEE Trans. Microw. Theory Techn., vol.58, no. 4, pp. 970-977, Apr. 2010] By using uniform impedance and stepped impedance resonators, the balanced circuit has a good common-mode rejection function, but this filter has a high conductor loss, which is only suitable for narrow-band circuit design and cannot be applied to broadband circuits.

[0004] Literature 2 [T. B. Lim and L. Zhu, “Differential-mode ultra-widebandbandpass filter on micostrip line,” Electron. Lett., vol. 45, no. 22, pp.1124-1125, Oct. 2009.] Based on branch line structure An ultra-wideband balanced filter is proposed, but the circuit is bulky, the common-mode rejection effect is not ideal, and the bandwidth rejection is limited

[0005] Document 3 [Y. –J. Lu, S. –Y. Chen, and P. Hsu, “A differential-modewideband bandpass filter with enhanced common-mode suppression using slotlineresonator,” IEEE Microw. Wireless Compon. Lett., vol. 22, no. 10, pp. 503-505, Oct. 2012.] Based on the slot line structure, an ultra-wideband balanced filter with inherent common-mode rejection function is designed. Although it has a good common-mode rejection effect, but The related balanced filter structure needs to be etched on the ground plane, which greatly limits the application on multi-layer structures

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