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Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band

A band-pass filter and broadband technology, applied in the field of miniaturized large dual-frequency ratio broadband microwave microstrip band-pass filter, can solve the problem that dual-frequency filters do not have DC blocking function, and it is difficult for dual-frequency filters to obtain high-pass at the same time Inter-band isolation, wide passband bandwidth, and wide stopband characteristics, etc., to achieve high isolation between passbands, large dual-frequency ratio, and simple effects

Inactive Publication Date: 2013-06-12
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for traditional multimode resonator dual-band filters to obtain high pass-band isolation, wide pass-band bandwidth and wide stop-band characteristics at the same time
Some dual-band filters based on multimode resonators do not even have DC blocking

Method used

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  • Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band
  • Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band

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Embodiment Construction

[0023] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0024] Referring to the accompanying drawings, the metal cavity 1 provides an installation carrier for the dielectric substrate 3 . Because the characteristic impedance of the standard RF front-end system is 50 ohms, the present invention uses a 50 ohm feeder 4 connected to the grounded ladder impedance resonator composed of a short-circuit stub line 5 and a high-impedance line 6 as the input and output ports of the proposed structure of the present invention. Generally speaking, in order to obtain the required external quality factor of the filter, the 50-ohm feeder 4 is connected to points B1 and B2 on the short-circuit stub line 5 . Changing the positions of points B1 and B2 can adjust the external quality factor of the filter. The probe on the SMA connector 2 is in direct contact with the 50 ohm feeder 4, and the signal is input from one of the SMA connector...

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Abstract

The invention relates to a micro wave and micro band band-pass filter for a miniature large double-frequency ratio wide band. The band-pass filter is characterized in that one end of an open-circuit branching line is connected with the center of a high-resisting line, and two ends of the high-resisting line are respectively connected with a short circuit branching line; a symmetrical center on the high-resisting line is connected with two outer stepping impedance lines and two inner stepping impedance lines, the two inner stepping impedance lines are connected onto the high-resisting line on one side of the open-circuit branching line, and the two outer stepping impedance lines and the two inner stepping impedance lines are symmetrical with the open-circuit branching line; two short circuit branching lines are respectively connected with an SMA (small-motion accelerator) through a feed line of 50ohm; and the end of each short circuit branching line is provided with a grounding hole. The band-pass filter has the following advantages that a size of the filter is small, band pass is realized through a double-frequency wide band, isolation between passing bands is high, and a double-frequency ratio is large. By the adoption of the band-pass filter, the requirement on processing precision is low, the realization is simple, the cost of construction is low, and the production is convenient.

Description

technical field [0001] The invention belongs to filters, in particular to a miniaturized large double-frequency ratio broadband microwave microstrip band-pass filter. Background technique [0002] Microwave filter is one of the most commonly used components in the field of microwave technology. It is used to transmit useful signals with low loss and attenuate unwanted clutter signals and noise in the stop band. Modern dual-mode or multi-mode communication systems are able to accommodate multiple communication modes like GSM, GPS, WLAN... . In addition, high data rate communication systems require wide passband components to implement. A dual-band wideband filter applied to such a system can significantly improve the performance of the system's RF front-end. Due to the advantages of small size, light weight, planarization and easy integration, microstrip dual-band filters are widely used. The ladder impedance resonator is a common structure for designing microstrip dual-ba...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 纪玉雪许进
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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