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Continuously adjustable dual-band band elimination filter based on surface acoustic wave resonator

A surface acoustic wave and resonator technology, which is applied in the field of continuously adjustable dual-band band-stop filter, can solve the problems of complex implementation structure, large number of components, poor performance, etc., and achieves simple implementation, high stop-band attenuation, Bandwidth continuously adjustable effect

Pending Publication Date: 2020-12-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dimitra Psychogiou realized a band-stop filter with adjustable bandwidth by combining SAW resonators and lumped elements, but its implementation structure is relatively complex, the number of components is large, the size is large, and the performance is poor

Method used

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  • Continuously adjustable dual-band band elimination filter based on surface acoustic wave resonator
  • Continuously adjustable dual-band band elimination filter based on surface acoustic wave resonator
  • Continuously adjustable dual-band band elimination filter based on surface acoustic wave resonator

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specific Embodiment approach

[0025] The continuous adjustable dual-band band-stop filter based on the surface acoustic wave resonator of the present invention, its preferred embodiment is:

[0026] figure 1 The principle of the continuously adjustable double-band band-stop filter based on the surface acoustic wave resonator is expounded, and its composition includes two identical double-resonant filter units, which are connected in series through a 50Ω transmission line. Each filter unit consists of two different one-port SAW resonators with a capacitance C between the two resonators e For coupling, there are also 2 inductors L grounded s1 , L s2 and 2 variable capacitors C s1 、C s2 connected in parallel to the input and output ports of the SAW resonator, by changing C s1 、C s2 value to achieve continuous adjustable bandwidth.

[0027] The Butterworth Van-Dyke (BVD) equivalent circuit is often used to describe SAW resonators, such as figure 2 shown. Among them, C p is the static capacitance, L ...

specific Embodiment

[0037] Such as Figure 6 As shown, this embodiment provides a second-order continuously tunable dual-band band-stop filter based on a surface acoustic wave device. Including two sections of input and output feeders, two identical double resonant filter units and microstrip line Z connecting the two units 0 . Each filter unit consists of two different one-port SAW resonators with a capacitor C between the two resonators e For coupling, the grounded 2 inductors L s1 , L s2 Connected in parallel to both ends of the coupling capacitor, two varactor diodes D 1 and its bias circuit L 1 、C 1 Connect in parallel to the SAW resonator port and the input and output feeder connection.

[0038] In the present embodiment, RO3164A and RO3144E-1 of Murata Company are selected as surface acoustic wave resonators, and its BVD equivalent model design parameters are respectively: C p =1.8pF,L m =16.71μH,C m =2.01fF,k t 2 ≈0.13%, the center frequency is at 868.5MHz; C p =2.1pF, L m =...

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Abstract

The invention discloses a continuously adjustable double-band band elimination filter based on a surface acoustic wave resonator. The continuously adjustable double-band band elimination filter comprises two sections of input and output feeder lines, two same double-resonance filter units and a microstrip line for connecting the two units, wherein each filter unit is composed of two different single-port SAW resonators, a capacitor is arranged between the two resonators for coupling, two grounded inductors are connected to the two ends of a coupling capacitor in parallel, and two varactors andbiasing circuits of the varactors are connected to the joints of ports of the SAW resonators and the input and output feeder lines in parallel. The continuous dual-stop band bandwidth adjustability is realized by controlling the reverse bias voltage of the varactors. The invention provides a novel topological structure based on the surface acoustic wave resonator, which has the advantages of compact structure and simplicity and convenience in implementation. The surface acoustic wave resonator and lumped element hybrid design method is used, so that the working bandwidth is significantly wider than that of a traditional trapezoidal and lattice type SAW filter, and the filter has the characteristic of high stop band attenuation. Continuous adjustment of the bandwidth is realized, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a continuously adjustable dual-band band-stop filter based on a surface acoustic wave resonator. Background technique [0002] In radio communication technology, filters are important frequency-selective devices in radio frequency and microwave circuits. They are mainly used for signal separation and suppression in communication systems, and their performance will directly affect the normal operation of the system. With the rapid development of wireless communication technology, how to effectively use the crowded radio frequency spectrum and meet the system's multi-band and multi-standard requirements has become an urgent problem to be solved. The practical use of wireless communication systems usually requires filters with tunable functions to operate in unpredictable interference environments to extract desired signals while flexibly suppressing unwanted inter...

Claims

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Application Information

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IPC IPC(8): H03H9/64H03H9/52
CPCH03H9/6409H03H9/6479H03H9/52Y02D30/70
Inventor 陈畅陈瑞璇周凌云陈卫东张祥
Owner UNIV OF SCI & TECH OF CHINA
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