Dual-frequency antenna combiner

Abstract

The utility model relates to the technical field of rail transit communication, in particular to a dual-frequency antenna combiner, which comprises a case lower cover, a mounting plate is fixedly mounted at the top of the case lower cover, an LTE (Long Term Evolution) bridge adopting a chip type passive device is fixedly mounted at the top of the mounting plate, a front panel is fixedly mounted on one side of the case lower cover, and a rear panel is fixedly mounted on the other side of the case lower cover. The front panel is provided with four N-type-to-SMA radio frequency heads in a linear array, the LTE bridge is provided with four radio frequency cables, one end of each radio frequency cable far away from the LTE bridge is fixedly connected with the N-type-to-SMA radio frequency head, the LTE bridge is adopted by the antenna combiner, the use of an LTE-M vehicle-ground integrated wireless communication system is satisfied, and the antenna combiner has the advantages that the antenna combiner is simple in structure and convenient to use, and the service life of the LTE-M vehicle-ground integrated wireless communication system is prolonged. The small-size SMA radio frequency connector has the advantages of being small in size, excellent in index, low in cost and the like, the equipment size can be reduced, the N-type-to-SMA radio frequency head smaller in size is adopted for connection with an external circuit, the production and construction cost can be reduced, and the problem of space limitation is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit communications, specifically a dual-frequency antenna combiner. Background Art

[0002] In the field of rail transit communications technology, subways use the LTE-M system to provide integrated on-board wireless communication systems for drivers, dispatchers, and ground staff. The RF signals from devices in these systems are combined using an antenna combiner and then interconnected with the onboard antennas, enabling multiple devices to share a single antenna.

[0003] As more and more equipment is installed on trains, but the overall installation space remains unchanged, it is obviously unreasonable to modify and redesign the trains. Therefore, it is necessary to reduce the size of equipment including antenna combiners.

[0004] In the existing technology, the antenna combiner uses a traditional machined 3dB bridge. Its passive components are large and occupy a large space. At the same time, the 3dB bridge all has N-type connectors, which are troublesome to install inside the equipment. The connector size is also too large, which does not meet the train's modification needs to reduce the size of the equipment. Utility Model Content

[0005] The purpose of the present utility model is to provide a dual-frequency antenna combiner to solve the problems raised in the above background technology.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A dual-band antenna combiner includes a chassis lower cover, a mounting plate fixedly mounted on the top of the chassis lower cover, an LTE bridge using chip-type passive components fixedly mounted on the top of the mounting plate, a front panel fixedly mounted on one side of the chassis lower cover, four N-type to SMA radio frequency heads arranged in a linear array on the front panel, four radio frequency cables mounted on the LTE radio frequency bridge, and one end of the radio frequency cable away from the LTE bridge is fixedly connected to the N-type to SMA radio frequency head.

[0008] Among the four N-type to SMA radio frequency heads, the two N-type to SMA radio frequency heads in the middle serve as IN ports, which are used to connect to the external dispatching vehicle-mounted station and TAU respectively. The two N-type to SMA radio frequency heads at both ends serve as OUT ports, which are used to connect to the external bottom flat antenna and roof shark fin antenna respectively, so as to realize train communication in rail transit.

[0009] Preferably, the two opposite sides of the chassis lower cover are fixedly connected with side beams, the side of the chassis lower cover away from the front panel is fixedly installed with a rear panel, and the two ends of the side beams are fixedly connected to the front panel and the rear panel respectively.

[0010] Preferably, a chassis upper cover is provided on the top of the chassis lower cover, and the side beams, the chassis upper cover and the chassis lower cover are all made of aluminum.

[0011] Preferably, the thickness of the upper chassis cover and the lower chassis cover are both 1.5 mm.

[0012] Preferably, the outer surfaces of the chassis upper cover and the chassis lower cover are both provided with a sandblasting layer and a natural oxide layer, which are used to provide protection for the chassis upper cover and the chassis lower cover.

[0013] Preferably, the inner surfaces of the side beams, the upper chassis cover and the lower chassis cover are fixedly connected with fixing plates with screw holes, and the upper chassis cover is provided with fixing holes for fixing the upper chassis cover and the lower chassis cover.

[0014] Beneficial effects of the utility model:

[0015] The antenna combiner of this utility model adopts an LTE bridge. While meeting the use of the LTE-M vehicle-ground integrated wireless communication system, it has the characteristics of small size, excellent indicators, and low cost. It can reduce the size of the equipment and use a smaller N-type to SMA radio frequency head to connect with external lines, which can reduce production and construction costs and solve the problem of space limitations. Chip-type passive components are used internally, and the aluminum chassis upper cover and chassis lower cover are used as the outer shell of the combiner, which makes the combiner better shielded and highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, it is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This utility model Figure 1 Front view of the center front panel;

[0019] Figure 3 This utility model Figure 1 Front view of the center rear panel;

[0020] Figure 4 It is an application schematic diagram of the antenna combiner in the utility model.

[0021] The reference numerals in the figures are as follows:

[0022] 1. Front panel, 2. Rear panel, 3. Upper chassis cover, 4. Lower chassis cover, 5. Side beams, 6. Mounting plate, 7. LTE bridge, 8. RF cable, 9. N-type to SMA RF connector. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] A dual-band antenna combiner includes a chassis lower cover 4, a mounting plate 6 is fixedly mounted on the top of the chassis lower cover 4, an LTE bridge 7 using chip-type passive components is fixedly mounted on the top of the mounting plate 6, a front panel 1 is fixedly mounted on one side of the chassis lower cover 4, four N-type to SMA radio frequency heads 9 in a linear array are provided on the front panel 1, four radio frequency cables 8 are installed on the LTE bridge 7, and one end of the radio frequency cable 8 away from the LTE bridge 7 is fixedly connected to the N-type to SMA radio frequency head 9.

[0025] Among the four N-type to SMA radio frequency heads 9, the two N-type to SMA radio frequency heads 9 in the middle serve as IN ports, which are respectively used to connect to the external dispatching vehicle-mounted station and TAU (train access unit); the two N-type to SMA radio frequency heads 9 at both ends serve as OUT ports, which are respectively used to connect to the external bottom flat antenna and roof shark fin antenna to realize train communication in rail transit.

[0026] like Figure 4 In some applications of the LTE-M system, the equipment that needs to be installed in the train mainly includes roof shark fin antennas, bottom flat panel antennas, antenna combiners, train access units (TAUs), and dispatching vehicle-mounted stations.

[0027] The rooftop shark fin antenna is installed on the roof of the train and has only one antenna interface;

[0028] The undercarriage flat panel antenna is installed on the undercarriage of the train and has only one antenna interface;

[0029] TAU: used for access of integrated vehicle-ground wireless services and has two antenna interfaces;

[0030] The dispatch vehicle-mounted station is used for drivers to communicate and has two antenna interfaces;

[0031] At this time, both the flat panel antenna and the shark fin antenna can be connected to the dispatching vehicle-mounted station and TAU through a combiner.

[0032] like Figure 1 The chassis upper cover 3 and the chassis lower cover 4 together constitute a standard 19-inch, 1U height chassis, and the LTE bridge 7 and the RF cable 8 are both located inside the chassis.

[0033] like Figure 1 The antenna combiner is mainly composed of an LTE bridge 7 and four RF cables 8. Each RF cable is connected to an N-type to SMA RF connector 9. The LTE bridge 7 uses a chip-type passive component with the characteristics of small size, high performance and low cost. The main indicators are as follows:

[0034]

[0035]

[0036] The two opposite sides of the chassis lower cover 4 are fixedly connected with side beams 5, and the side of the chassis lower cover 4 away from the front panel 1 is fixedly installed with the rear panel 2, and the two ends of the side beams 5 are fixedly connected to the front panel 1 and the rear panel 2 respectively.

[0037] like Figure 1 Both side beams are made of open-die aluminum profiles, which can facilitate quick assembly of the chassis and achieve the designed strength.

[0038] The top of the chassis lower cover 4 is provided with a chassis upper cover 3 , and the side beams 5 , the chassis upper cover 3 and the chassis lower cover 4 are all made of aluminum.

[0039] like Figure 1 、 Figure 2 and Figure 3 The side beams 5, the upper cover 3 and the lower cover 4 of the chassis are made of aluminum material to achieve signal shielding and improve the reliability of the combiner.

[0040] The thickness of the chassis upper cover 3 and the chassis lower cover 4 are both 1.5 mm.

[0041] like Figure 1 、 Figure 2 and Figure 3 The 1.5mm thick side beams 5, chassis upper cover 3 and chassis lower cover 4 can ensure that the chassis is not easily deformed and shockproof.

[0042] The outer surfaces of the chassis upper cover 3 and the chassis lower cover 4 are both provided with a sandblasting layer and a natural oxide layer, which are used to provide protection for the chassis upper cover 3 and the chassis lower cover 4.

[0043] like Figure 1 The outer surfaces of the chassis upper cover 3 and the chassis lower cover 4 are sandblasted to form a sandblasted layer, and the oxidation process is used to form a natural oxide layer, which provides protection for the outer surfaces of the chassis upper cover 3 and the chassis lower cover 4 and improves the durability of the chassis.

[0044] The inner surfaces of the side beams 5 , the chassis upper cover 3 and the chassis lower cover 4 are all fixedly connected with fixing plates with screw holes. The chassis upper cover 3 is provided with fixing holes for fixing the chassis upper cover 3 and the chassis lower cover 4 .

[0045] like Figure 1 The fixing holes on the upper chassis cover 3 and the screw holes above the lower chassis cover 4 are aligned together, making it convenient to use bolts to fix the upper chassis cover 3 and the lower chassis cover 4 together.

[0046] Compared with related technologies, the dual-band antenna combiner provided by the present invention has the following beneficial effects:

[0047] The antenna combiner of the present invention adopts an LTE bridge 7, which meets the requirements of the LTE-M vehicle-ground integrated wireless communication system while having the characteristics of small size, excellent indicators, and low cost. It can reduce the size of the equipment and adopt a smaller N-type to SMA radio frequency head 9 to connect with external lines, which can reduce production and construction costs and solve the problem of space limitation. Chip-type passive components are used internally, and the aluminum chassis upper cover 3 and chassis lower cover 4 are used as the outer shell of the combiner, so that the shielding of the combiner is better and the reliability is high.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A dual-band antenna combiner, comprising a chassis lower cover (4), characterized in that: A mounting plate (6) is fixedly mounted on the top of the chassis lower cover (4), an LTE bridge (7) using a chip-type passive device is fixedly mounted on the top of the mounting plate (6), a front panel (1) is fixedly mounted on one side of the chassis lower cover (4), four N-type to SMA radio frequency heads (9) in a linear array are provided on the front panel (1), four radio frequency cables (8) are installed on the LTE bridge (7), and one end of the radio frequency cable (8) away from the LTE bridge (7) is fixedly connected to the N-type to SMA radio frequency head (9); Among the four N-type to SMA radio frequency heads (9), the two N-type to SMA radio frequency heads (9) located in the middle serve as IN ports, respectively used for connecting to an external dispatching vehicle-mounted station and TAU, and the two N-type to SMA radio frequency heads (9) located at both ends serve as OUT ports, respectively used for connecting to an external vehicle bottom flat antenna and a vehicle roof shark fin antenna, so as to realize train communication in rail transit.

2. The dual-band antenna combiner according to claim 1, wherein: The two opposite sides of the chassis lower cover (4) are fixedly connected to side beams (5); a rear panel (2) is fixedly mounted on the side of the chassis lower cover (4) away from the front panel (1); and the two ends of the side beams (5) are respectively fixedly connected to the front panel (1) and the rear panel (2).

3. The dual-band antenna combiner according to claim 2, wherein: The top of the chassis lower cover (4) is provided with a chassis upper cover (3), and the side beams (5), the chassis upper cover (3) and the chassis lower cover (4) are all made of aluminum.

4. The dual-band antenna combiner according to claim 3, characterized in that: The thickness of the chassis upper cover (3) and the chassis lower cover (4) are both 1.5 mm.

5. The dual-band antenna combiner according to claim 3, characterized in that: The outer surfaces of the chassis upper cover (3) and the chassis lower cover (4) are both provided with a sandblasting layer and a natural color oxidation layer, which are used to provide protection for the chassis upper cover (3) and the chassis lower cover (4).

6. The dual-band antenna combiner according to claim 3, characterized in that: The inner surfaces of the side beams (5), the chassis upper cover (3) and the chassis lower cover (4) are all fixedly connected with fixing plates with screw holes, and the chassis upper cover (3) is provided with fixing holes for fixing the chassis upper cover (3) and the chassis lower cover (4).

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