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X-band three-digital MEMS(Micro Electric Mechanical System) tunable band-pass filter

A filter and X-band technology, applied in the field of electronic science, which can solve the problems of large pull-down voltage, uncompact structure, and insufficient Q value.

Inactive Publication Date: 2010-07-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Q value is not high enough, and the structure is not compact, so the volume is still difficult to meet the requirements of radar receivers and wireless communication systems
And the pull-down voltage is too large (20V ~ 80V), it is difficult to be compatible with electronic communication systems

Method used

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  • X-band three-digital MEMS(Micro Electric Mechanical System) tunable band-pass filter
  • X-band three-digital MEMS(Micro Electric Mechanical System) tunable band-pass filter
  • X-band three-digital MEMS(Micro Electric Mechanical System) tunable band-pass filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] An X-band three-bit MEMS tunable filter, such as figure 1 , 2 As shown, including two input or output ports integrated on the same chip, two matching capacitor networks C M and two LC resonators; the first input or output port passes through the first matching capacitor network C M Connected to the first LC resonator; the second input or output port passes through the second matching capacitor network C M It is connected with the second LC resonator; the first LC resonator is coupled and connected with the second LC resonator; the whole filter has a mirror symmetrical structure relative to the coupling center line of the two LC resonators.

[0042] The input or output port is a gradual microstrip line.

[0043] The LC resonator consists of a square microstrip split ring and a resonant capacitor network C L Composition; Among them, one end of the square microstrip split ring is connected with the matching capacitor network C in the horizontal direction M Connected, ...

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Abstract

The invention discloses an X-band three-digital MEMS (Micro Electric Mechanical System) tunable band-pass filter, belonging to the technical field of electronic science, and relating to an MMIC (Microwave and Millimeter Wave Integrated Circuit) and an MEMS. The tunable band-pass filter comprises two inlet ports or output ports, two matching capacitor networks CM and two LC resonators; the whole filter is in a mirror symmetrical structure relative to a coupling center line of the two LC resonators; each LC resonator consists of a square microstrip snap ring and a resonance capacitor network CL embedded into an opening; the capacitance network is realized by using an RF (Radio Frequency)-MEMS technique, the capacitance of three branches of the capacitance network is changed by using three MEMS switches controlled by direct-current biasing, thereby changing the working frequency of the filter center. In the invention, eight tunable center frequency points can be realized; and the invention has the characteristics of less insertion loss, large Q value, compact structure, small volume and low drop-down voltage, and can be applied to various X-band communication apparatuses.

Description

technical field [0001] The invention belongs to the technical field of electronic science and relates to a microwave millimeter wave integrated circuit (MMIC) and a microelectromechanical system (MEMS), in particular to an X-band adjustable bandpass filter. Background technique [0002] The demand for filters in the fields of microwave communications, microwave navigation, telemetry and remote control, satellite communications, and military electronic countermeasures is increasing. For communication systems, filters are a crucial radio frequency device. Traditional tunable filters generally use YIG (yttrium iron garnet) oscillators or solid-state tunable reactance components as tuning components. The YIG oscillator has a high Q value and a wide frequency tuning range, but it has a large volume, high power consumption (0.75-3W), and low linearity (IIP3≈23-26dBm); solid-state adjustable reactance components have Wide frequency tuning range, the volume can also be made small, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/12B81B7/02
Inventor 鲍景富杜亦佳涂程
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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