CN216120689U

CN216120689U - Be applied to three frequency three port broadband combiners of 5G frequency channel

Info

Publication number: CN216120689U
Application number: CN202122454493.4U
Authority: CN
Inventors: 张伟强; 谭致良
Original assignee: Guangdong Zhongyuan Creative Technology Co ltd
Current assignee: Guangdong Zhongyuan Creative Technology Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-03-22
Anticipated expiration: 2031-10-12

Abstract

The utility model provides a three-frequency three-port broadband combiner applied to a 5G frequency band, which comprises a dielectric plate, wherein the upper surface and the lower surface of the dielectric plate are coated with copper, the upper surface of the dielectric plate is provided with a microstrip combiner, the lower surface of the dielectric plate is grounded, the microstrip combiner on the upper surface of the dielectric plate comprises three bonding pads, three impedance matching units, a T-shaped impedance matching connector, a low-frequency filter loop and a high-frequency filter loop, one end of the T-shaped impedance matching connector is connected with the low-frequency filter loop through a first microstrip line to form a low-frequency path, and the other end of the T-shaped impedance matching connector is connected with the high-frequency filter loop through a second microstrip line to form a high-frequency path. By adopting the three-frequency three-port broadband combiner, good matching can be formed with the existing broadband antenna, such as 690-.

Description

Be applied to three frequency three port broadband combiners of 5G frequency channel

Technical Field

The utility model relates to the technical field of wireless communication, in particular to a three-frequency three-port broadband combiner applied to a 5G frequency band.

Background

While the frequency of the communication system is continuously evolving to 5G, the 3G/LTE frequency bands (1.71 GHz-2.69GHz and 3.3GHz-3.6 GHz) still play an important role in the evolution process of the communication technology. At present, the base station antenna faces the problem of sharing multi-antenna feed resources by 5G, 4G and 3G, the limitation of limited antenna feed resources can be well solved by using the multi-frequency antenna, but the multi-frequency antenna also needs the coordination work of a plurality of antennas, namely, multi-path signals of a transmitter can simultaneously and indiscriminately pass through the antennas, the signals need to be combined, through adopting a combiner, the multi-path signals of different systems can effectively share one set of multi-frequency antenna, and the construction cost of the base station can be greatly reduced.

The combiner is an important device of the multi-frequency antenna, the traditional combiner is a cavity type structure, but the structure is heavy and inconvenient for installation, the existing base station antenna adopts a mode of a built-in microstrip line combiner to realize the combination of different signals, compared with the traditional cavity structure combiner, the microstrip combiner has the advantages of obvious advantages, small volume and low cost, the manufacture of the microstrip combiner utilizes the PCB technology, not only can realize rapid production, but also makes the installation of the base station more convenient, the existing microstrip combiner is basically designed with a double-frequency three-port or three-port, namely, one output port corresponds to one communication frequency band, along with the market demand of the multi-frequency broadband antenna, such as the frequency of 800-, the bandwidth is generally 1GHz, which is no longer suitable for a multi-frequency broadband antenna, so a combiner applicable to a broadband multi-frequency antenna is urgently needed in the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a combiner which can be applied to a broadband multi-frequency antenna.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

the utility model provides a be applied to three frequency three-port broadband combiners of 5G frequency channel, includes the dielectric-slab, the dielectric-slab upper and lower surface covers copper, and its upper surface is provided with the microstrip and closes the way, and the lower surface is ground connection, the dielectric-slab upper surface microstrip closes the way including three pad, three impedance matching unit, T type impedance match connector, low frequency filter circuit and high frequency filter circuit, wherein, T type impedance match connector one end is connected with low frequency filter circuit through first microstrip line and is formed the low frequency route, T type impedance match connector other end passes through the second microstrip line and is connected with high frequency filter circuit and form the high frequency route.

Preferably, the low-frequency filter circuit has three low-frequency open-circuit branches, and the high-frequency filter circuit has two high-frequency open-circuit branches.

Preferably, each low-frequency open-circuit branch is provided with a lambda/4 impedance resonator.

Preferably, each high-frequency open-circuit branch is provided with a lambda/4 impedance resonator.

Preferably, the lengths of the microstrip lines at the open end of the high-frequency filter loop are equal.

Preferably, the first microstrip line has a narrower line width than the second microstrip line.

Preferably, the impedance matching unit changes the impedance to 50 ohms to realize impedance matching of the microstrip combiner.

Preferably, the frequency band of the low-frequency channel is 690-960 MHz.

Preferably, the frequency band of the high-frequency path is 1710-.

The utility model has the beneficial effects that: by adopting the three-frequency three-port broadband combiner, good matching can be formed with the existing broadband antenna, such as 690-.

Drawings

Fig. 1 is a schematic structural diagram of a three-frequency three-port broadband combiner according to the present invention;

fig. 2 is parameters of antenna simulation using a three-frequency three-port broadband combiner in an embodiment of the present invention;

fig. 3 is an insertion loss test chart of the combiner according to the embodiment of the present invention.

Reference numbers in the figures: the antenna comprises a 1-dielectric plate, 11-bonding pads, 12-impedance matching units, 13-T-shaped impedance matching connectors, 14-low-frequency filter circuits, 15-high-frequency filter circuits, 16-first microstrip lines, 17-second microstrip lines, 141-low-frequency open-circuit branches and 151-high-frequency open-circuit branches.

Detailed Description

Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. In the present disclosure, the terms "include", "arrange", "disposed" and "disposed" are used to mean open-ended inclusion, and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting as to the number or order of their objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the utility model.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, a triple-frequency three-port broadband combiner applied to a 5G frequency band includes a dielectric slab 1, where upper and lower surfaces of the dielectric slab 1 are coated with copper, an upper surface of the dielectric slab is provided with a microstrip combiner, and a lower surface of the dielectric slab is grounded, the microstrip combiner on the upper surface of the dielectric slab 1 includes three pads 11, three impedance matching units 12, a T-shaped impedance matching connector 13, a low-frequency filter loop 14 and a high-frequency filter loop 15, where one end of the T-shaped impedance matching connector 13 is connected with the low-frequency filter loop 14 through a first microstrip line 16 to form a low-frequency path, and the other end of the T-shaped impedance matching connector 13 is connected with the high-frequency filter loop 15 through a second microstrip line 17 to form a high-frequency path; the first microstrip line 16 has a narrower line width than the second microstrip line 17.

Specifically, the input port of the microstrip combiner is an impedance matching unit 12, and a narrow first microstrip line 16 is arranged in front of the low-frequency path by using the high impedance characteristic of the narrow microstrip line, so that the passing of high-frequency current can be prevented, the discrete transmission of signals is realized, the impedance matching between frequency bands is realized, meanwhile, the coupling between the low-frequency path and the high-frequency path can be effectively avoided, and the overall filtering effect of the combiner is enhanced.

In an embodiment, the low-frequency filter loop has three low-frequency open stubs 141, and the high-frequency filter loop 15 has two high-frequency open stubs 141; each low-frequency open-circuit branch 141 is provided with a lambda/4 impedance resonator; the low-frequency filter loop adopts the parallel filtering of three lambda/4 impedance resonators, the passband is 0.69-0.96GHz, the stop band is 1.7-2.7GHz & 3.3-3.3GHz, and the stop band is about 3 times of the passband bandwidth; each high-frequency open-circuit branch 141 is provided with a lambda/4 impedance resonator, a high-pass filter loop is arranged in the high-frequency filter loop and adopts the parallel connection of two lambda/4 impedance resonators, the microstrip lines at the open-circuit end are equal in length, the resonance frequency of the trap can be increased and set by the person skilled in the art to be about 2.9GHz, and then the resonance frequency of the trap is the same as the resonance frequency of the circuit, so that the open-circuit end can exert the effect of the trap, and a trap area of about 600MHz is generated within the bandwidth of 1.7-3.7 GHz. By controlling the impedance ratio of the two sections of microstrip lines of the impedance resonator, the combiner has more flexible transmission zero, and steep drop of the combiner between the stop band and the pass band is realized, so that good out-of-band rejection effect is realized.

In an embodiment, the impedance matching unit 12 changes the impedance to 50 ohms to implement impedance matching of the microstrip combiner, and specifically, the impedance matching is implemented by adjusting an impedance matcher. It should be noted here that implementing impedance matching by using an impedance matcher is prior art and is not described herein again.

In an embodiment, the frequency band of the low frequency channel is 690-960 MHz; the frequency band of the high-frequency path is 1710-3700 MHz. The dual-frequency effect can be realized, and the design can form good matching with most broadband antennas, such as 690-.

Fig. 2 shows the S parameter of the antenna simulation using the three-port broadband combiner in the embodiment of the present invention, where the passband bandwidth of S11 is (0.69GHz-0.96GHz, 1.7-2.7GHz & 3.3-3.7 GHz). 100MHz in 1.6-1.7GHz band, S11 drops to below-15 from-1 steeply, this design and most broadband antennas, such as 690-. The method is not only beneficial to reducing the construction cost of the base station, but also is expected to accelerate the national coverage speed of the Sub-65G network.

It can be seen from fig. 3 that the access loss is greater than-1 dBi in the required frequency band, which satisfies the requirements of industrial design and practical application.

Compared with the single-port output corresponding to the single frequency band of the traditional microstrip combiner, the microstrip combiner has great progress.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. The utility model provides a be applied to three-port broadband combiners in three frequencies of 5G frequency channels, includes dielectric-slab (1), the upper and lower surface of dielectric-slab (1) covers copper, and its upper surface is provided with the microstrip combiner, and the lower surface is ground connection, its characterized in that, dielectric-slab (1) upper surface microstrip combiner is including three pad (11), three impedance matching unit (12), T type impedance matched connector (13), low frequency filter return circuit (14) and high frequency filter return circuit (15), wherein, T type impedance matched connector (13) one end is connected with low frequency filter return circuit (14) through first microstrip line (16) and is formed the low frequency path, T type impedance matched connector (13) other end is connected with high frequency filter return circuit (15) through second microstrip line (17) and is formed the high frequency path.

2. The three-port broadband combiner applied to 5G band, according to claim 1, wherein the low-frequency filtering loop has three low-frequency open branches (141), and the high-frequency filtering loop (15) has two high-frequency open branches (151).

3. The three-port broadband combiner applied to 5G band, according to claim 2, is characterized in that each of the low frequency open stubs (141) is provided with a λ/4 impedance resonator.

4. The three-port broadband combiner applied to 5G band, according to claim 2, is characterized in that each high frequency open stub (151) is provided with a λ/4 impedance resonator.

5. The combiner of claim 1, wherein the microstrip lines at the open end of the high-frequency filter loop (15) have equal lengths.

6. A three-port broadband combiner according to claim 1, wherein the first microstrip line (16) has a narrower line width than the second microstrip line (17).

7. The three-port broadband combiner applied to 5G band, according to claim 1, wherein the impedance matching unit (12) changes the impedance to 50 ohms to realize the impedance matching of the microstrip combiner.

8. The combiner of claim 1, wherein the band of the low frequency path is 690-960 MHz.

9. The three-port broadband combiner of claim 1, wherein the band of the high frequency path is 1710-3700 MHz.