Planar low pass band pass triplexer

A triplexer and bandpass filter technology, applied in the field of planar low-pass bandpass triplexer, can solve the problem of independent design of low-pass bandpass filter, inability to apply low-pass-bandpass triplexer, The performance of the low-pass filter needs to be improved to achieve the effect of light weight, reduced design difficulty, and simple structure
CN104577268BInactive Publication Date: 2017-06-06SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2017-06-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a planar lowpass-bandpass triplexer. The planar lowpass-bandpass triplexer comprises a lowpass filter (11), a bandpass filter (12), a bandpass filter (13) and a transmission line (14), wherein two branch node loaded resonators in the lowpass filter (11) generate two transmission zeros, the frequency of one transmission zero is identical with the center frequency of the bandpass filter (12), the frequency of the other transmission zero is identical with the center frequency of the bandpass filter (13), and accordingly center frequency signals of the two bandpass filters are under the short-circuit condition when the branch node loaded resonators are located at the input end of the lowpass filter (11); the transmission line (14) is provided with a locating point p1, a locating point p2 and a locating point p3, the distance between the p1 and the p3 corresponds to quarter wavelength of the center frequency of one bandpass filter, and the distance between the p2 and the p3 corresponds to quarter wavelength of the center frequency of the other bandpass filter; according to quarter wavelength impedance inversion, the center frequency signal of the bandpass filter (12) is under the open-circuit condition when the bandpass filter (12) is located at the p1, and the center frequency signal of the bandpass filter (13) is under the open-circuit condition when the bandpass filter (13) is located at the p2. The lowpass-bandpass filters of the triplexer are designed conveniently and independently and enabled not to influence each other, design cycles can be shortened, and design efficiency can be improved.
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Description

technical field

[0001] The invention relates to the technical field of planar filters, in particular to a planar low-pass band-pass triplexer. Background technique

[0002] In recent years, with the rapid development of wireless communication technology, people's demand for wireless communication services is increasing day by day. In order to meet people's various needs, the communication system must be compatible with multiple communication standards when designing. Today's wireless communication systems are basically multiplexing systems. For time division multiplexing, the problem can be solved as long as the receiving and transmitting are arranged in different time slices. For frequency division multiplexing, in order to reduce the number of filter devices, the It is necessary to design a special device to isolate different signals without causing interference with each other. Such a device is a multiplexer.

[0003] At present, the design of multiplexers composed of ba...

Claims

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