CN213636255U

CN213636255U - Three-frequency combiner

Info

Publication number: CN213636255U
Application number: CN202023178199.7U
Authority: CN
Inventors: 钟秋和
Original assignee: Chengdu Huirong Qihang Microwave Technology Co ltd
Current assignee: Chengdu Huirong Qihang Microwave Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-07-06
Anticipated expiration: 2030-12-25

Abstract

The utility model relates to a microwave device field specifically discloses a three-frequency combiner, including first input end, second input end, third input end and combiner output, its characterized in that, first input end and second input end are connected respectively with the first input end, the second input end that are used for the first three-port network of combiner and are constituted first dual-frequency combiner, second input end and third input end are connected with the first input end, the second input end that are used for the second three-port network of combiner and are constituted the second dual-frequency combiner; the first and second filters are low pass filters, and the third and fourth filters are high pass filters; the three-frequency combiner can well filter out clutter, has a good combining effect, and enables an antenna output signal not to have serious distortion.

Description

Three-frequency combiner

Technical Field

The utility model relates to a microwave device field specifically relates to frequency selective device.

Background

The combiner is a microwave device for frequency selection, and has wide application in the fields of wireless communication, radar, satellite and the like. The combiner is mainly used for the occasion of combining multiple antennas, so that two or more antennas can share the transceiver. The combiner can also be used as a duplexer and used in the occasion that the transceiver shares a pair of antennas, and in order to ensure that the energy of the transmitter does not leak into the receiver and cause equipment damage, the combiner has higher requirements on isolation. In today that the spectrum resources are increasingly tense and the communication standard is continuously evolving, the combiner as a frequency division and combining device receives more and more attention. The design of the plane combiner with reliable performance and low cost has important significance in engineering projects. The existing three-frequency combiner has the defects that more clutter is introduced, the combining effect is great, and the distortion of an antenna output signal is serious.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a three frequency combiners, this three frequency combiners can filter the clutter well, and the combination effect is better for antenna output signal does not have serious distortion.

In order to achieve the above object, the utility model adopts the following technical scheme:

a three-frequency combiner comprises a first input end, a second input end, a third input end and a combining output end, wherein the first input end and the second input end are respectively connected with a first input end and a second input end of a first three-port network used for combining to form a first double-frequency combiner;

a third three-port network; the output end of the first dual-frequency combiner and the output end of the second dual-frequency combiner are respectively connected with the first input end and the second input end of a third three-port network; the output end of the third three-port network is connected with the output end of the combiner, so as to obtain a combiner of three signals with different frequencies respectively input by the first input end, the second input end and the third input end;

the first three-port network, the second three-port network and the third three-port network respectively adopt T-shaped structures; the two ends of the T-shaped arm of the first three-port network are connected with the first input end and the second input end; the two ends of the T-shaped arm of the second three-port network are connected with the second input end and the third input end; two ends of a T-shaped arm of the third three-port network are connected with a T-shaped vertical output end of the first three-port network and a T-shaped vertical output end of the second three-port network; and the T-shaped vertical output end of the third three-port network is connected with the combined output end.

Preferably, the first dual-frequency combiner further includes a first filter disposed between the first input terminal and the first input terminal of the first three-port network for guaranteeing the integrity and cleanness of the first input frequency, and a second filter disposed between the second input terminal and the second input terminal of the first three-port network for guaranteeing the integrity and cleanness of the second input frequency.

Preferably, the second dual-frequency combiner further includes a third filter disposed between the first input terminal and the second input terminal of the second three-port network for guaranteeing the integrity and cleanness of the second input frequency, and a fourth filter disposed between the second input terminal and the third input terminal of the second three-port network for guaranteeing the integrity and cleanness of the third input frequency.

Preferably, a power divider for guaranteeing a second input frequency power of the second input end is disposed between the second input end and the first dual-frequency combiner and the second dual-frequency combiner.

Preferably, a fifth filter for ensuring the integrity and cleanness of the output frequency of the first dual-frequency combiner is disposed between the output end of the first dual-frequency combiner and the first input end of the third three-port network.

Preferably, a sixth filter for ensuring the integrity of the output frequency of the second dual-frequency combiner and the cleanness is disposed between the output end of the second dual-frequency combiner and the second input end of the third three-port network.

Preferably, the frequency ranges input by the first input end, the second input end and the third input end are respectively: 350MHz-470MHz, 98MHz-960MHz, 1710MHz-2700 MHz.

Preferably, the first filter and the second filter are low-pass filters; the low pass filter is a low pass filter formed by the LTC 1608.

Preferably, the third filter and the fourth filter are high-pass filters; the high-pass filter is a high-pass filter formed by LTC 1608.

Through the technical scheme, clutter can be well filtered out by the three-frequency combiner, the combining effect is good, and the output signal of the antenna is free from serious distortion.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses three frequency combiners can filter the clutter well, and the combination effect is better for antenna output signal does not have serious distortion. And moreover, the power divider is added in the three-frequency combiner, so that the input second input frequency can be well divided into two input signals with the same energy, frequency, phase and the like, and the signal attenuation of the second input frequency caused by directly distributing the second input frequency is avoided. And a filter is added before the input of each three-port network, so that the combined signal is more complete and clean and no clutter is generated. Meanwhile, the added second dual-frequency combiner plays a better combining effect, and the second input frequency and the third input frequency are combined before being input into the third three-port network, so that the isolation between signals is increased, the isolation between a receiver and a transmitter is facilitated, the possibility that the receiver is burnt is reduced, and the safety of a receiving and transmitting system is increased.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a low-pass filter configuration diagram for a first filter and a second filter;

fig. 3 is a high-pass filter configuration diagram for the third filter and the fourth filter.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

The embodiment provides a three-frequency combiner, which comprises a first input end, a second input end, a third input end and a combining output end, wherein the first input end and the second input end are respectively connected with a first input end and a second input end of a first three-port network for combining to form a first dual-frequency combiner;

In base station communication, the rf transceiver front end is an important component of the whole system, and it is also continuously developing with the update of the whole communication field. In frequency division multiplexing radio frequency systems, it is often necessary to use a set of transmitters operating in different frequency bands and receivers operating simultaneously. At this time, a combiner is required. In this embodiment, two dual-frequency combiners are used first, so as to combine two of the three different input frequencies together, which provides good isolation. If two dual-frequency combiners are simultaneously connected to an antenna without isolation, a receiver can receive serious interference and even can be directly burnt out, so that a third three-port network is added into the system to isolate a transmitter from the receiver. Similarly, the first three-port network is adopted in the first dual-frequency combiner, and the second three-port network is adopted in the second dual-frequency combiner to achieve the isolation effect. The first three-port network, the second three-port network and the third three-port network can respectively adopt a T-shaped structure, or adopt a common resonator, a multi-mode resonant network or a coupling line mode to combine respective double frequencies together. The T-junction combiner is relatively bulky since it requires an extra part to match the two frequencies. The volume of the combiner can be effectively reduced by using a common resonator or a coupling line.

Wherein the first dual-frequency combiner further comprises a first filter disposed between the first input of the first three-port network and the first input for guaranteeing integrity and cleanness of the first input frequency f1, and a second filter disposed between the second input of the first three-port network and the second input for guaranteeing integrity and cleanness of the second input frequency f 2. In the design of the three-frequency combiner, the filter is a main component, and the performance of the filter is directly related to the effect of the whole device. The filter is a two-port frequency selective device and plays a very important role in radio frequency microwave systems. Generally, in the dual-frequency combiner, it is sufficient to use a low-pass or high-pass filter to input the signal of the input frequency without other noise into the input terminal of the three-port network. Here, the first filter and the second filter may be designed as low-pass filters. Furthermore, the low-pass filter used in the first dual-frequency combiner does not need to have a strict low-pass response, the insertion loss in the required pass band is sufficiently small, and the rejection in the stop band at frequencies above the pass band is sufficiently high. In this embodiment, as shown in fig. 2, the first filter and the second filter are low pass filters designed by an adopted LTC1608, and two low pass filters can be realized by one LTC1608 chip.

The second dual-frequency combiner further includes a third filter disposed between the first input terminal and the second input terminal of the second three-port network for guaranteeing integrity and cleanness of the second input frequency f2, and a fourth filter disposed between the second input terminal and the third input terminal of the second three-port network for guaranteeing integrity and cleanness of the third input frequency f 3. Here, the third filter and the fourth filter are designed as high-pass filters. Also, the high frequency filter does not need to have a strict high pass response, but only requires sufficiently low insertion loss in a given pass band and sufficient rejection in a stop band at frequencies below the pass band. In this embodiment, as shown in fig. 3, the third filter and the fourth filter are high pass filters designed using LTC 1608. Also, one LTC1608 can implement only one high pass filter. The LTC1608 used in the above embodiments is a clock tunable, second order filter module circuit, and different circuits based on this LTC1608 can implement a low pass filter and a high pass filter.

Finally, the output end of the three-frequency combiner obtains signals obtained by combining the first input frequency f1, the second input frequency f2 and the third input frequency f 3.

A power divider used for ensuring second input frequency power of the second input end is arranged between the second input end and the first dual-frequency combiner and between the second input end and the second dual-frequency combiner. A power divider (power divider) is a device that divides one path of input signal energy into two or more paths to output equal or unequal energy. The purpose of using the power divider here is to enable the frequency of the second input end to be divided into two signals with equal energy, and not to change the information such as the frequency, the phase, and the like of the signal input by the second input end.

And a fifth filter for ensuring the integrity and cleanness of the output frequency of the first dual-frequency combiner is arranged between the output end of the first dual-frequency combiner and the first input end of the third three-port network. The fifth filter is designed as a low-pass filter. And, the fifth filter is a Stub Loaded Resonator (SLR), which is a multimode resonator.

And a sixth filter for ensuring the integrity and cleanness of the output frequency of the second dual-frequency combiner is arranged between the output end of the second dual-frequency combiner and the second input end of the third three-port network. The sixth filter is designed as a high-pass filter. Also, this filter includes two SLR resonators, one side of which is coupled to each other.

The frequencies f1, f2 and f3 input by the first input end, the second input end and the third input end respectively range from: 350MHz-470MHz, 98MHz-960MHz, 1710MHz-2700 MHz.

The circuit design in this embodiment introduces a new transmission zero point under the condition of hardly increasing the circuit insertion loss and the volume, improves the roll-off of the filter, achieves good out-of-band rejection and isolation effects, and achieves the out-of-band rejection and isolation of the finally made combiner circuit by more than 35 dB.

Claims

1. A three-frequency combiner comprises a first input end, a second input end, a third input end and a combining output end, and is characterized in that the first input end and the second input end are respectively connected with a first input end and a second input end of a first three-port network used for combining to form a first dual-frequency combiner, and the second input end and the third input end are connected with a first input end and a second input end of a second three-port network used for combining to form a second dual-frequency combiner;

a third three-port network; the output end of the first dual-frequency combiner and the output end of the second dual-frequency combiner are respectively connected with the first input end and the second input end of the third three-port network; the output end of the third three-port network is connected with the output end of the combiner, so as to obtain a combiner of three signals with different frequencies respectively input by the first input end, the second input end and the third input end;

the first three-port network, the second three-port network and the third three-port network respectively adopt T-shaped structures; two ends of a T-shaped arm of the first three-port network are respectively connected with the first input end and the second input end; two ends of a T-shaped arm of the second three-port network are respectively connected with the second input end and the third input end; two ends of a T-shaped arm of the third three-port network are respectively connected with a T-shaped vertical output end of the first three-port network and a T-shaped vertical output end of the second three-port network; and the T-shaped vertical output end of the third three-port network is connected with the combined output end.

2. The three-frequency combiner of claim 1, wherein the first dual-frequency combiner further comprises a first filter disposed between the first input and the first input of the first three-port network for guaranteeing the first input frequency integrity and cleanliness, and a second filter disposed between the second input and the second input of the first three-port network for guaranteeing the second input frequency integrity and cleanliness.

3. The three-frequency combiner of claim 1, wherein the second dual-frequency combiner further comprises a third filter disposed between the first input and the second input of the second three-port network for guaranteeing the second input frequency integrity and cleanliness, and a fourth filter disposed between the second input and the third input of the second three-port network for guaranteeing the third input frequency integrity and cleanliness.

4. The triple-frequency combiner of claim 1, wherein a power divider for guaranteeing a second input frequency power of the second input terminal is disposed between the second input terminal and the first and second dual-frequency combiners.

5. The three-frequency combiner of claim 1, wherein a fifth filter is disposed between the output of the first dual-frequency combiner and the first input of the third three-port network to ensure the integrity and cleanness of the output frequency of the first dual-frequency combiner.

6. The three-frequency combiner of claim 1, wherein a sixth filter is disposed between the output of the second dual-frequency combiner and the second input of the third three-port network to ensure output frequency integrity and cleanliness of the second dual-frequency combiner.

7. The three-frequency combiner of claim 1, wherein the frequency ranges input by the first input terminal, the second input terminal, and the third input terminal are respectively: 350MHz-470MHz, 98MHz-960MHz, 1710MHz-2700 MHz.

8. The three-frequency combiner of claim 2, wherein the first and second filters are low-pass filters; the low pass filter is a low pass filter formed by the LTC 1608.

9. The three-frequency combiner of claim 3, wherein the third and fourth filters are high-pass filters; the high-pass filter is a high-pass filter formed by LTC 1608.