CN203690451U

CN203690451U - Duplexer

Info

Publication number: CN203690451U
Application number: CN201320759534.3U
Authority: CN
Inventors: 林思宏
Original assignee: Dfine Technology Co Ltd
Current assignee: Dfine Technology Co Ltd
Priority date: 2013-11-27
Filing date: 2013-11-27
Publication date: 2014-07-02
Anticipated expiration: 2023-11-27

Abstract

The utility model provides a duplexer, solving technical problems that an existing duplexer is relatively large in size, complex in design, difficult in debugging, and long in design period, etc. A T-shaped joint (3) of a microstrip line is connected with output ends of a low-pass filter (1) and a high-pass filter (2). A first port (4) is connected with an antenna and the T-shaped joint (3) of a microstrip line. A second port (5) is connected with the input end of the low-pass filter (1). A third port (6) is connected with the input end of the high-pass filter (2). The high-pass filter (2) is formed by two coupled first microstrip lines (8). Length of the first microstrip line (8) is one fourth of the wavelength, being equal to that of a blocking condenser. The distance between the two coupled first microstrip lines (8) and the width of the coupled line are not lower than 0.15 mm. The T-shaped joint (3) of the microstrip line is a 50 omega second microstrip line (9). The low-pass filter (1) is a Chebyshev low-pass filter which is formed by a series-connection fourth microstrip line (10), a series-connection fifth microstrip line (11), and a sixth microstrip line (12) which is open on a parallel-connected terminal.

Description

Duplexer

technical field:

The utility model relates to kind and is applied in the device of realizing frequency selection function above receiver, and the signal of assigned frequency can pass through device, and constant-frequency signal energy is in addition reflected by device.

background technology:

Subminaturization duplexer is mainly used among aerial microwave electron war and communication system, is a kind of frequency division microwave device, can make the transceiver channel of receiver be independent of each other.

Mainly there is following some deficiency in existing duplexer:

1) product heaviness, bulky, debugging trouble;

2) be not easy to integratedly, consistency is poor.

3) meet the design relative complex of index, the design cycle is long.

utility model content:

The technical problems such as the utility model is intended to solve existing duplexer and exists volume larger, and design is complicated, and debug difficulties and design cycle are long, to provide, a kind of small product size is little, good product consistency and short subminaturization duplexer of design cycle.

The purpose of this utility model is achieved through the following technical solutions:

Formed by a low pass filter 1 and high pass filter 2 parallel connections, microstrip line T connector 3 and low pass filter 1, the output of high pass filter 2 is connected, the first port 4 is public port, connect antenna and microstrip line T connector 3, the second port 5 is connected with the input of low pass filter 1, the operating frequency of low pass filter 1 is 1280MHz～1360MHz, the 3rd port 6 is connected with the input of high pass filter 2, the operating frequency of high pass filter 2 is 8500MHz～8700MHz, high pass filter 2 is made up of two coupling the first microstrip lines 8, the length of the first microstrip line 8 is 1/4th wavelength, be equivalent to a capacitance, article two, the distance between coupling the first microstrip line 8 and the width of coupling line are not less than 0.15mm, microstrip line T connector is 50 ohm of second microstrip line 9, low pass filter 1 is for cutting than snow skin low pass filter, by series connection the 4th microstrip line 10, the 6th microstrip line 12 of the 5th microstrip line 11 and shunt terminal open circuit of connecting forms.

The utility model uses simple microstrip design, by a low pass filter and a high pass filter formation in parallel, uses microstrip line T connector to be connected, and reduces influencing each other between filter, makes it be satisfied with practical application.

The utility model small product size is little, technology difficulty is low and the design cycle is short.

brief description of the drawings:

Fig. 1 circuit theory diagrams of the present utility model

Fig. 2 is high pass filter schematic diagram.

Fig. 3 is microstrip line T connector schematic diagram.

Fig. 4 is principle of lowpass filter figure.

embodiment:

The utility model is subminaturization duplexer, and whole duplexer is made up of microstrip transmission line.Port one is public port, connects antenna.Between port one and port 2, be receive path low pass filter, operating frequency is 1280MHz～1360MHz.Between port one and port 3, be transmission channel high pass filter, operating frequency is 8500MHz～8700MHz.For the isolation that duplexer has been had, it should be to have high frequency selectivity to suppress the element of undesired signal that formation duplexer obtains filter.

Receive path low pass filter is directly designed to simply cut than snow skin low pass filter, by using low pass filter model in genesys software to be optimized design, can directly obtain the good low pass filter of index.

Transmission channel high pass filter directly uses the design of microstrip line capacitance, makes microstrip line length be about 1/4th wavelength, at required frequency place resonance.Regulate distance and coupling line width between coupling line, make it be not less than 0.15mm, be convenient to technique and realize.

For microstrip line T connector, directly use 50 ohm microstrip to replace T connector, remove 50 ohm of port microstrip lines of independent design low pass high pass filter, be directly connected in port one (50 ohm microstrip), regulate the line length of the low high pass filter in junction, to reduce filter impact each other.Design, not only reduces design difficulty, and has reduced debugging work load like this, and printed board volume is reduced greatly, and overall dimension is 12.6mm × 8.9mm × 0.508mm, is convenient to Integrated design.

Subminaturization duplexer is through emulation, and public port 4 at 1280MHz-1360MHz frequency range reflection coefficient is-24.69dB～-24.22dB.At 8500-8700MHz frequency range reflection coefficient be-26.4dB～-26.13dB.5 ports of low pass filter 1 at 1280MHz-1360MHz frequency range reflection coefficient are-24.44dB～23.87dB.6 ports of high pass filter 2 are at 8500-8700MHz frequency range reflection coefficient-26.66dB～-26.36dB.Public port 4 is to the insertion loss-0.046dB～-0.041dB between 5 ports of low pass filter 1.Public port 4 is to the insertion loss-0.087dB～-0.086dB between 6 ports of high pass filter 2.5 ports of

low pass filter

1 and 6 ports of the high pass filter 2 isolation-25dB～-24.2dB in 1280MHz-1360MHz, the isolation in 8500-8700MHz frequency range is-47.1dB～-42.1dB.Frequency range build-in test data fit simulation result, the correctness of certification theory design.

Coupled microstrip line 8, line width 0.15mm, microstrip line spacing 0.15mm, length 4.7mm.

Series connection microstrip line 10, line width 0.15mm, line length 6.5mm.

Series connection microstrip line 11, line width 0.15mm, line length 3.2mm.

Shunt terminal open circuit microstrip line 12, line width 1.4mm, line length 5.6mm.

Claims

1. duplexer, it is characterized in that by a low pass filter (1) and a high pass filter (2) formation in parallel, microstrip line T connector (3) and low pass filter (1), the output of high pass filter (2) is connected, the first port (4) is public port, connect antenna and microstrip line T connector (3), the second port (5) is connected with the input of low pass filter (1), the operating frequency of low pass filter (1) is 1280MHz～1360MHz, the 3rd port (6) is connected with the input of high pass filter (2), the operating frequency of high pass filter (2) is 8500MHz～8700MHz, high pass filter (2) is made up of two coupling the first microstrip lines (8), the length of the first microstrip line (8) is 1/4th wavelength, be equivalent to a capacitance, article two, the distance between coupling the first microstrip line (8) and the width of coupling line are not less than 0.15mm, microstrip line T connector is 50 ohm of second microstrip line (9), low pass filter (1) is for cutting than snow skin low pass filter, by series connection the 4th microstrip line (10), connect the 6th microstrip line (12) composition of the 5th microstrip line (11) and shunt terminal open circuit.