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Band-pass filter and duplexer

A band-pass filter and duplexer technology, applied in waveguide devices, duplex signal operation, electrical components, etc., can solve the problems of high cost, wide frequency interval of broadband filter, small frequency adjustment range, etc., and achieve improvement roll-off effect

Active Publication Date: 2019-07-30
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing LC bandpass filter can use FBAR to replace the capacitor in it to improve roll-off, but the frequency adjustment range of FBAR is relatively small, and it is impossible to achieve such a wide frequency interval on the same die for broadband filters, so it is necessary Two die, one frequency is set at about 3.3GHz, one is set at 3.9GHz
As a result, high cost and difficult technical problems have been brought about

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] image 3 A circuit structure diagram of the bandpass filter according to the first embodiment of the present application is shown. Such as image 3 As shown, a band-pass filter, the band-pass filter is between the input terminal P1 and the output terminal P2, including:

[0039] The parallel resonator 10 formed by connecting the inductor L1 and the Lamb wave resonator LWR1 in parallel, and the parallel resonator 20 formed by connecting the inductor L2 and the Lamb wave resonator LWR2 in parallel, are connected in parallel between the parallel resonator 10 and the parallel resonator Between the resonators 20, an LC series resonator 30 formed by connecting an inductor L3 and a capacitor C3 in series is connected in series,

[0040] Wherein, the inductor L1, the inductor L2, the Lamb wave resonator LWR1 and the Lamb wave resonator LWR2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 ...

Embodiment 2

[0043] Figure 5 A circuit structure diagram of the bandpass filter according to the second embodiment of the present application is shown. Such as Figure 5 As shown, a band-pass filter, the band-pass filter is between the input terminal P1 and the output terminal P2, including:

[0044] The parallel resonator 10 formed by connecting the inductor L1 and the Lamb wave resonator LWR1 in parallel, and the parallel resonator 20 formed by connecting the inductor L2 and the Lamb wave resonator LWR2 in parallel, are connected in parallel between the parallel resonator 10 and the parallel resonator Between the resonators 20, a series resonator 30 formed by connecting an inductor L3 and a Lamb wave resonator LWR3 in series is connected in series,

[0045] Wherein, the inductor L1, the inductor L2, the Lamb wave resonator LWR1 and the Lamb wave resonator LWR2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel re...

Embodiment 3

[0047] Image 6 A circuit structure diagram of a band-pass filter according to the third embodiment of the present application is shown. Such as Image 6As shown, a band-pass filter, the band-pass filter is between the input terminal P1 and the output terminal P2, including:

[0048] Parallel resonator 10 formed by parallel connection of inductor L1 and Lamb wave resonator LWR1, and parallel resonator 20 formed by parallel connection of inductor L2 and capacitor C2, between parallel resonator 10 and parallel resonator 20 Between, the LC series resonator 30 formed by the series connection of the inductor L3 and the capacitor C3 is connected in series,

[0049] Wherein, the inductor L1, the inductor L2, the Lamb wave resonator LWR1 and the capacitor C1 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2 .

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Abstract

The invention provides a band-pass filter and a duplexer. The band-pass filter is arranged between an input terminal and an output terminal, and comprises two groups of parallel resonators and a series resonator connected between the two groups of parallel resonators, wherein at least one group of resonators in the parallel resonators and the series resonator is formed by connecting a Lamb wave resonator and an inductor, and the other two groups of resonators are formed by connecting one of a film bulk acoustic wave resonator or a capacitor with the inductor. According to the invention, the capacitor at a specific position of the band-pass filter is replaced by the LWR; on one hand, the LWR can effectively improve the roll-off by arranging the frequency on the two sides of the pass band ofthe filter; on the other hand, the frequency of the LWR can be adjusted through the physical thickness of each layer of the device and the spacing of surface patterns; the frequency adjustment rangeis wider, and for a high-bandwidth filter, especially an ultra-wideband filter composed of an LC filter, on the condition that the frequency is wider, it can be guaranteed that the roll-off improvement at the two sides can be achieved through the same die.

Description

technical field [0001] The invention relates to the field of semiconductors and micro-electromechanical systems, in particular to a band-pass filter and a duplexer. Background technique [0002] With the rapid development of wireless communication systems, the performance requirements of the RF front-end are becoming more and more stringent. Moreover, the wireless communication system is developing towards the direction of multi-function, multi-band, and multi-protocol, which poses a higher challenge to the RF front-end in wireless communication equipment. As a very important module of the RF front-end, the performance of the filter plays a decisive role in the performance of the RF front-end. Therefore, there is a very urgent need for continuous improvement of filter performance. [0003] Prior art LC bandpass filters typically include an LC series resonant network on a series path and two parallel resonant networks on a parallel path. Wherein, the series resonant networ...

Claims

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Application Information

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IPC IPC(8): H03H9/54H01P1/20H04L5/14
CPCH03H9/547H01P1/20H04L5/14Y02D30/70
Inventor 庞慰蔡华林
Owner TIANJIN UNIV