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2.4-kilomegahertz miniature band-pass filter with low loss and double-zero

A band-pass filter and double-zero technology, applied in waveguide devices, electrical components, multi-terminal pair networks, etc., can solve the problems of electrical performance such as temperature drift, temperature stability limitation, large insertion loss, etc., and achieve pass-band insertion The effect of low loss, compact structure, and small reflection loss

Inactive Publication Date: 2010-01-06
NANJING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

), the volume of the filter is proportional to the working wavelength, so the volume is larger
With surface acoustic wave filter technology, although the volume can be reduced, its electrical performance has the disadvantages of temperature drift, high cost, and large insertion loss. Applications are very limited

Method used

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  • 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero
  • 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero
  • 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero

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Embodiment Construction

[0013] combine figure 1 , figure 2 , a kind of low-loss dual-zero point 2.4 gigahertz miniature bandpass filter of the present invention, comprises the 50 ohm impedance input port Port1 of surface installation, the first stage parallel resonant unit L1, C1, the first stage series resonant unit C2, L2, the first stage Interstage coupling capacitors C5, C6, interstage series coupling inductors L5, second interstage coupling capacitors C7, C8, second stage series resonant units C3, L3, second stage parallel resonant units L4, C4, first inductance L1 Between the space coupling capacitor C9 and the fourth inductance L4, the surface-mounted 50-ohm impedance output port Port2 and the ground terminal; the first-stage parallel resonance unit L1, C1 and the second-stage parallel resonance are connected in parallel between the input port Port1 and the output port Port2 Units L4 and C4, the first-stage series resonant unit L2 and C2 are connected in parallel with the first-stage paralle...

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Abstract

The invention discloses a 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero, which comprises a surface-mounted 50-ohm impedance input port, a first-stage parallel resonance unit, a first-stage serial resonance unit, a first inter-stage coupling capacitor, an inter-stage serial coupled inductor, a second inter-stage coupling capacitor, a second-stage parallel resonance unit, a second-stage serial resonance unit, a surface-mounted 50-ohm impedance output port and a ground terminal. The 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero has the advantages of low insertion loss, small volume, light weight, high reliability and the like, and is particularly suitable for Bluetooth transmission, ISM (industry, science and medicine) frequency band transmission, communication of corresponding microwave frequency bands, digital radar and wireless communication handheld terminals, as well as occasions and corresponding systems which are serious to volume, electrical performance, temperature stability and reliability.

Description

technical field [0001] The invention relates to a bluetooth transmission, ISM (industrial, scientific, medical) frequency band transmission, communication in the corresponding microwave frequency band, digital radar, individual satellite mobile, communication terminal, military and civilian multi-mode and multi-channel communication system terminal, Miniature bandpass filters for wireless communication handheld terminals, etc., especially low-loss double-zero 2.4 GHz miniature bandpass filters. Background technique [0002] Bluetooth technology is a short-range wireless connection technology used to replace cables or connections used on fixed electronic devices. Its devices use the globally accepted ISM frequency band that does not require a license to transmit data and voice in real time. In order to avoid interference to the image frequency and PCS and GSM channels, the filter must have sufficient attenuation on the frequencies that need to be suppressed. In ISM (industri...

Claims

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Application Information

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IPC IPC(8): H01P1/20H01P1/203H03H7/075
Inventor 戴永胜张杰宋志东王飞叶仲华李宝山王超宇姚友芳郭玉红周文衎肖圣磊符光强陈少波
Owner NANJING UNIV OF SCI & TECH
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