Combining phase shifter feed network for base station antennas

Abstract

The application belongs to the field of wireless communication, and discloses a combiner phase shifter feeder network for a base station antenna, which comprises a combiner assembly, a phase shifter assembly and a support frame, the combiner assembly and the phase shifter assembly are both fixed on the support frame, the combiner assembly is arranged below the phase shifter assembly in a spaced manner, and a combiner output port of the combiner assembly is connected with a phase shifter input port of the phase shifter assembly. The application has the beneficial effect that: a laminated connection is adopted to reduce the occupied space, the combiner is placed directly below the phase shifter, the combiner output port is directly connected to the input port of the phase shifter from the bottom of the phase shifter through a short coaxial line, and is fixed through the designed support frame, so that the volume is reduced, the volume occupied by the feeder network is further reduced, the combiner phase shifter is integrated, the output ports are all located on the same side of the phase shifter, the welding is facilitated, the coaxial line layout is simplified, and the good effect of antenna electric adjustment is ensured.

Description

[Technical Field]

[0001] This invention relates to the field of wireless communication, and more particularly to a combiner phase shifter feed network for base station antennas. [Background Technology]

[0002] With the widespread adoption of smart devices and the diversification of mobile terminal types, people's demands for signal coverage in mobile communication networks are constantly upgrading, posing a significant challenge to operators. Initially, omnidirectional coverage was achieved using a single type of antenna. Later, beam-directed high-gain radiating antennas emerged, and now electrically tunable antennas are widely used. The core components of electrically tunable antennas lie in the combiner and phase shifter in the feed network. The combiner enables electrically tunable beams across different frequency bands, simplifying the feed network. The phase shifter transmits phases in an arithmetic sequence to the input ports of each antenna element, thereby achieving electrically tunable beam tilt. This not only reduces co-channel interference but also concentrates beam energy in the desired area according to actual application needs, resulting in stronger signal coverage. Furthermore, the beam is less prone to distortion, greatly satisfying the signal coverage requirements of mobile terminals.

[0003] In the development of electrically tunable antennas, phase shifter design methods are mainly divided into two types: one is to achieve phase change by altering the physical length of the movement path, such as the pointer-type rotating phase shifter; the other is to achieve phase change by altering the electrical length of the movement path, such as the dielectric-moving pull-out phase shifter. Each has different advantages in different application scenarios, and the choice can be made based on the actual situation.

[0004] In practical applications, most phase shifters suffer from disordered output port arrangement, failing to align with the required phase difference order of the antenna array. For example, the output ports of pointer-type rotary phase shifters are paired, potentially leading to tangling during coaxial cable connections. This not only hinders layout and assembly but also introduces additional port insertion loss and phase deviation, significantly negatively impacting electro-tuning performance. Dielectric-shifting pull-out phase shifters also rarely achieve unidirectional port arrangement. Furthermore, these phase shifters have another drawback: to obtain sufficient equivalent electrical length, the phase shifter material often uses a different dielectric constant than the substrate material, typically employing a lower dielectric constant to create a dielectric difference and achieve a wider phase shift range. However, this inevitably increases manufacturing costs.

[0005] Therefore, it is necessary to provide a combined phase shifter feed network for base station antennas that can realize the sequential arrangement of phase shifter output ports to reduce the cross-entanglement of coaxial cables, maintain the uniformity of substrate material and phase shifter plate material while ensuring a sufficiently large phase shift range, greatly simplify cable layout and reduce manufacturing costs, and realize the simplification and cost reduction of electrically adjustable base station antennas. [Summary of the Invention]

[0006] This invention discloses a combiner phase shifter feed network for base station antennas, which can effectively solve the technical problems involved in the background art.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A combiner phase shifter feed network for a base station antenna includes a combiner assembly, a phase shifter assembly, and a support frame. The combiner assembly and the phase shifter assembly are both fixed on the support frame, and the combiner assembly is spaced below the phase shifter assembly. The combiner output port of the combiner assembly is connected to the phase shifter input port of the phase shifter assembly.

[0009] As a preferred improvement of the present invention: the combiner assembly includes a combiner base plate fixed on the support frame, the combiner base plate is provided with a first input port, a second input port and an output port, the first input port is connected to the output port through a first filtering channel, and the second input port is connected to the output port through a second filtering channel.

[0010] As a preferred improvement of the present invention: the first input port of the combiner receives a 700-790MHz signal, and the second input port of the combiner receives an 885-960MHz signal.

[0011] As a preferred improvement of the present invention, the combiner substrate is an FR4 substrate.

[0012] As a preferred improvement of the present invention: the phase shifter assembly includes a cavity, a phase shifter substrate, a support clamp, a first phase shifter plate, and a pull rod. The cavity is open on the left and right sides. The support clamp is fixed on the cavity. The phase shifter substrate is fixed on the support clamp. The phase shifter substrate is located inside the cavity and is spaced apart from the inner wall of the cavity. The first phase shifter plate is located inside the cavity. One end of the pull rod is located outside the cavity, and the other end is connected to the first phase shifter plate.

[0013] As a preferred improvement of the present invention, the phase shifter plate is slidably connected to the phase shifter substrate.

[0014] As a preferred improvement of the present invention: the phase shifter substrate is provided with a phase shifter input port, the phase shifter input port is connected to a first microstrip line and a second microstrip line, the first microstrip line and the second microstrip line are symmetrically arranged on the left and right sides of the phase shifter input port, the first microstrip line is connected to a first output port and a second output port of the phase shifter, the second microstrip line is symmetrically connected to a third output port and a fourth output port of the phase shifter, the phase shifter input port is connected to a fifth output port of the phase shifter, the first microstrip line and the second microstrip line are located on the upper surface of the phase shifter substrate, and the first phase shifter plate is located above the phase shifter substrate.

[0015] As a preferred improvement of the present invention: the first output port, the second output port, the third output port, the fourth output port, and the fifth output port of the phase shifter are all located on the front side of the phase shifter substrate.

[0016] As a preferred improvement of the present invention: the lower surface of the phase shifter substrate is provided with a third microstrip line and a fourth microstrip line, the third microstrip line is connected to the phase shifter input port, the phase shifter first output port and the phase shifter second output port, and the fourth microstrip line is connected to the phase shifter input port, the phase shifter third output port and the phase shifter fourth output port. The phase shifter assembly further includes a second phase shifter plate, which is located below the phase shifter substrate and is connected to the pull rod.

[0017] As a preferred improvement of the present invention: the cavity is a rectangular aluminum plate, and both the phase shifter substrate and the first phase shifter plate are FR4 substrates.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention uses a low-cost FR4 substrate and a phase shifter plate of the same material to design a phase shifter, which can provide stable port power distribution and continuously changing phase difference. It has the advantages of accurate port power and phase distribution, low cost, and flexible structure adjustment.

[0020] 2. In this invention, all phase shifter ports are located on the same side of the phase shifter, and the ports are arranged sequentially according to equal phase differences. : :0: : The arrangement greatly facilitates welding while simplifying the coaxial cable routing layout, avoiding cross-tangling during cable assembly, reducing amplitude and phase loss caused by coaxial cables, and ensuring good antenna electrical adjustment performance.

[0021] 3. In this invention, the power supply network adopts a stacked connection to reduce the space occupied. The combiner is placed directly below the phase shifter. The output port of the combiner is directly connected from the bottom of the phase shifter to its input port through a short coaxial cable and is fixed by a designed support frame, which achieves the effect of reducing the volume. Only a short coaxial cable is used to connect the ports, which can be regarded as an integrated combiner and phase shifter, further reducing the volume occupied by the power supply network. [Attached Image Description]

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a schematic diagram of the combiner phase shifter feed network for base station antennas according to the present invention;

[0024] Figure 2 This is a schematic diagram of the combiner assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the phase shifter assembly structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the phase shifter substrate structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the support clamp structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the support frame structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the overall feeding network for the array antenna.

[0030] Figure 8 A schematic diagram of the return loss at each port of the 700MHz-960MHz combiner;

[0031] Figure 9 A schematic diagram of the return loss S11 of a phase shifter in the 700MHz-960MHz frequency band;

[0032] Figure 10 A schematic diagram showing the transmission power of each port in the 700MHz-960MHz frequency band;

[0033] Figure 11 This is a schematic diagram illustrating the continuous phase change trend of each port when the phase shifter is moved in the 700MHz-960MHz frequency band.

[0034] In the diagram: 100- Combiner assembly, 110- Combiner substrate, 111- Combiner first input port, 112- Combiner second input port, 113- First filter channel, 114- Second filter channel, 115- Combiner output port, 200- Phase shifter assembly, 210- Cavity, 220- Phase shifter substrate, 221- Phase shifter input port, 222- First microstrip line, 223- Phase shifter first output port, 224- Phase shifter second output port, 225- Second microstrip line, 226- Phase shifter third output port, 227- Phase shifter fourth output port, 228- Phase shifter fifth output port, 230- Support clamp, 231- E-shaped support block, 232- Slot, 240- First phase shifter plate, 250- Pull-out rod, 300- Support frame, 310- Fixing base, 320- Connecting rod.

Detailed Implementation Methods

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0040] Please see Figure 1 As shown, this invention provides a combiner-phase-shifter feed network for base station antennas, including a combiner assembly 100, a phase-shifter assembly 200, and a support frame 300. Both the combiner assembly 100 and the phase-shifter assembly 200 are fixed to the support frame 300, with the combiner assembly 100 spaced below the phase-shifter assembly 200. The combiner output port 115 of the combiner assembly 100 is connected to the phase-shifter input port 221 of the phase-shifter assembly 200. Specifically, the 700MHz-960MHz combiner and phase-shifter are connected in a stacked manner to reduce space occupation. The combiner is placed directly below the phase-shifter, and the combiner output port is directly connected from the bottom of the phase-shifter to its input port via a short coaxial cable, and fixed by the designed support frame 300 (nylon frame), achieving a reduction in size. Using only a short coaxial cable for port connection can be considered as an integrated combiner-phase-shifter, further reducing the volume occupied by the feed network.

[0041] Please see Figure 2 As shown, the combiner assembly 100 includes a combiner substrate 110 fixed on the support frame 300. The combiner substrate 110 is provided with a first input port 111, a second input port 112, and an output port 115. The first input port 111 is connected to the output port 115 through a first filter channel 113, and the second input port 112 is connected to the output port 115 through a second filter channel 114. In this embodiment, the first input port 111 receives a 700-790MHz signal, the second input port 112 receives an 885-960MHz signal, and the combiner substrate 110 is an FR4 substrate.

[0042] Specifically, in actual operation, signals of 700-790MHz and 885-960MHz can be input from the first input port 111 and the second input port 112 of the combiner, respectively. The combiner assembly 100 has two filtering channels, which can filter the two signals separately to achieve good out-of-band high rejection performance. A coaxial cable is led out from the combiner output port 115 and connected to the phase shifter assembly 200 located directly above the combiner assembly 100. An opening is made in the cavity directly below the phase shifter assembly 200 to facilitate the welding of the coaxial cable, thus forming a stacked structure. In order to fix the stacked structure of the combiner assembly 100 and the phase shifter assembly 200, a support frame 300 is designed to be snap-fitted to the combiner assembly 100 and the phase shifter assembly 200, respectively.

[0043] Please see Figure 3 As shown, the phase shifter assembly 200 includes a cavity 210, a phase shifter substrate 220, a support clamp 230, a first phase shifter plate 240, and a pull rod 250. The cavity 210 is open on both sides. The support clamp 230 is fixed to the cavity 210, and the phase shifter substrate 220 is fixed to the support clamp 230. The phase shifter substrate 220 is located inside the cavity 210 and spaced apart from the inner wall of the cavity 210. The first phase shifter plate 240 is located inside the cavity 210. One end of the pull rod 250 is located outside the cavity 210, and the other end is connected to the first phase shifter plate 240. In this embodiment, the cavity 210 is a cuboid aluminum plate, and both the phase shifter substrate 220 and the first phase shifter plate 240 are FR4 substrates. The phase shifter plate 240 is slidably connected to the phase shifter substrate 220.

[0044] Specifically, the support clamp 230 is used to keep the phase shifter substrate 220 suspended within the cavity 210. The cavity 210 is equivalent to the metal ground of the feed network. The aluminum cavity can greatly reduce the spatial loss of electromagnetic waves and obtain better amplitude and phase performance. The phase shifter substrate 220 is used to fix microstrip lines, input ports, output ports, etc. The first phase shifter plate 240 is set corresponding to the phase shifter substrate 220 and moves relative to the phase shifter substrate 220 under the action of the pull rod 250. The first phase shifter plate 240 can be slidably connected to the cavity 210, the phase shifter substrate 220, or the support clamp 230, which can be set as needed. Using FR4 substrate material can save costs. For phase shifter plates in the 700MHz-960MHz frequency band, the bottom length is appropriately lengthened to cover the slow wave structure of the microstrip line. A long slot is hollowed out at the bottom without affecting the phase shift amount to facilitate through-hole soldering of the input port coaxial line. The pull rod 250 that controls the movement of the first phase shifter 240 is connected to the first phase shifter 240 on one side by a slot, and is also connected to other structures by a raised slot on the other side.

[0045] Please see Figure 4 As shown, the phase shifter substrate 220 is provided with a phase shifter input port 221. The phase shifter input port 221 is connected to a first microstrip line 222 and a second microstrip line 225. The first microstrip line 222 and the second microstrip line 225 are symmetrically arranged on the left and right sides of the phase shifter input port 221. The first microstrip line 222 is connected to a first phase shifter output port 223 and a second phase shifter output port 224. The second microstrip line 225 is symmetrically connected to a third phase shifter output port 226 and a fourth phase shifter output port 227. The phase shifter input port 221 is connected to a fifth phase shifter output port 228. The first microstrip line 222 and the second microstrip line 225 are located on the upper surface of the phase shifter substrate 220. The first phase shifter plate 240 is located above the phase shifter substrate 220. The first output port 223, the second output port 224, the third output port 226, the fourth output port 227, and the fifth output port 228 of the phase shifter are all located on the front side of the phase shifter substrate 220. A third microstrip line and a fourth microstrip line are provided on the lower surface of the phase shifter substrate 220. The third microstrip line is connected to the phase shifter input port 221, the first output port 223, and the second output port 224. The fourth microstrip line is connected to the phase shifter input port 221, the third output port 226, and the fourth output port 227. The phase shifter assembly 200 also includes a second phase shifter plate, which is located below the phase shifter substrate 220 and is connected to the pull rod 250.

[0046] Specifically, as shown in the figure, a slow-wave structure is provided on the microstrip line. By changing the corresponding phase, the phase of each output port changes. Assume the phase difference between the first output port 223 and the fifth output port 228 of the phase shifter is... The phase differences between the second output port 224, the first output port 223, the fifth output port 228, the third output port 226, the fourth output port 227, and the fifth output port 228 of the phase shifter are, in sequence: : :0: :

[0047] The slow-wave structure used in the phase shifter is a periodic microstrip dense tortuous structure. The phase shifting function of the phase shifter is achieved by changing the equivalent electrical length of the transmission path when the phase shifter plate moves. The periodic tortuous structure can be equivalent to introducing a periodic capacitor. By changing the characteristic impedance Z and length d of each tortuous section in the slow-wave structure, the total equivalent electrical length is made equal to the total electrical length D corresponding to the straight transmission line. This not only achieves better phase shifting performance but also shortens the moving distance, meeting the miniaturization requirements of base station phase shifters. That is: D=N×d×ω0 / Vp.

[0048] Where N is the number of periodic capacitors applied, Vp is the equivalent wave velocity of the electromagnetic wave, and ω0 is the angular frequency.

[0049] A phase shifter assembly 200 for base station communication bands is designed using a low-cost FR4 substrate. It has five output ports, all distributed on the same side of the assembly in a symmetrical structure, facilitating coaxial cable soldering and simplifying cable routing. The slow-wave structure utilizes bent microstrip lines, reducing the lateral length of the phase shifter assembly 200 and achieving miniaturization. Currently available phase shifters increase cost due to the use of different materials for the substrate and phase shifter plate, and some existing products lack a slow-wave structure design, resulting in excessive lateral size. This solution proposes using the same material for both the substrate and phase shifter plate to achieve cost reduction, and utilizing the slow-wave structure to achieve miniaturization of the lateral structure.

[0050] The ports are arranged in a straight line on the same side of the phase shifter assembly 200, and the phase differences of the ports form an arithmetic sequence, i.e., (-2φ):(-φ):0:φ:2φ. This port arrangement not only simplifies the layout when connecting coaxial cables to antenna array elements and reduces coaxial cable tangling, but also helps avoid additional insertion loss and phase fluctuations introduced by coaxial cables, thus improving the performance of electrically tunable array antennas. Compared with classic pointer-type phase shifters, whose output ports are located on both sides of the phase shifter, which is not conducive to layout and soldering, the phase shifter ports proposed in this solution are all arranged on the same side, which reduces the complexity of coaxial cable layout.

[0051] The low-frequency phase shifter for the 700MHz-960MHz band employs a double-sided microstrip line design. Identical microstrip structures are attached to the upper and lower surfaces of the phase shifter substrate 220, with an industrial green oil coating to prevent direct contact between the phase shifter and the microstrip line, thus avoiding nonlinear changes in phase and amplitude. At the ports, the microstrip lines on the upper and lower surfaces are electrically connected via metal vias. The external aluminum cavity structure serves as the metal ground of the feed network. The aluminum cavity significantly reduces spatial losses of electromagnetic waves, resulting in better amplitude and phase performance. Welding holes and operating holes are designed at the port connections for easy coaxial welding. Compared to existing traditional phase shifters exposed in space, the cavity design not only significantly reduces spatial losses of electromagnetic waves and achieves better amplitude and phase performance, but also allows for flexible adjustment of the coupling distance between the aluminum cavity and the dielectric substrate during the design process, controlling the maximum phase shift value.

[0052] In the feeder arrangement of phase shifters in the 700MHz-960MHz frequency band, the slow wave structure and the numerous bends used for impedance conversion in the feeder design achieve a large phase shift while miniaturizing the overall phase shifter. In actual operation, the phase shifter plate covering the feeder surface is moved by a pull rod. A phase shift of more than 70° can be obtained with a translation distance of less than 85mm, which meets the requirements of industrial miniaturization.

[0053] Please see Figure 5 As shown, the support clamp 230 includes an E-shaped support block 231, three horizontal plates on the right side, and gaps between the horizontal plates corresponding to the upper and lower sides of the cavity 210. The middle horizontal plate has a slot 232, and the phase shifter substrate 220 is engaged with the slot 232, allowing the phase shifter substrate 220 to be suspended. To improve structural stability, there are four support clamps 230, two on each of the left and right sides.

[0054] Please see Figure 6As shown, the support frame 300 includes two spaced-apart fixed seats 310. Each fixed seat 310 has a groove on its upper and lower sides, which correspondingly engages the combiner assembly 100 and the phase shifter assembly 200. The two fixed seats 310 are connected by a connecting rod 320. This structure is relatively stable and low in cost. It should be further noted that any other components used to achieve the above effects should fall within the inventive concept of this invention and should be protected within the scope of this invention.

[0055] Working Principle: The phase shifter consists of an aluminum cavity, an FR4 substrate, double-sided microstrip lines, and a phase shifter plate with a pull-out structure. The upper and lower microstrip lines are connected at the output port through metal vias. The slow-wave structure is constructed from bent microstrip lines, achieving miniaturization while obtaining better phase shift characteristics. The aluminum cavity serves as the coupling ground, allowing for flexible adjustment of the coupling distance during the design process. It also features corresponding soldering holes and operating holes. The phase shifter plate uses the same low-cost FR4 material as the substrate, with an extended bottom to cover the slow-wave structure. A raised slot design on the left side facilitates connection with the pull-out structure, and the bottom surface is coated with industrial green oil to prevent direct contact between the phase shifter plate and the metal microstrip lines, thus avoiding nonlinear changes and improving third-order intermodulation performance. The combiner's two input ports handle 700MHz-790MHz and 885MHz-960MHz signals respectively, exhibiting good transmission characteristics and out-of-band rejection. The combiner output port is fed directly into the phase shifter input port from below via a short coaxial cable, saving space in the overall power supply network and greatly facilitating the assembly and soldering of coaxial cables.

[0056] Figure 7 This is a schematic diagram of the overall feed network for the array antenna. The two input ports of the combiner handle signal inputs of 700MHz-790MHz and 885MHz-960MHz respectively, achieving good transmission performance while ensuring sufficient out-of-band suppression. The output port of the combiner is connected to the input port of the phase shifter. Since the phase shifter only has 5 output ports, a 1-to-2 power divider can be used to expand the number of array elements. Each port can simultaneously connect to one or more radiating elements, depending on the actual situation, i.e., the required maximum downtilt angle and the number of array elements.

[0057] Figure 8 The figure shows the return loss, transmission loss, and out-of-band rejection performance of each port of the 700MHz-960MHz combiner. As can be seen from the figure, the return loss S11 < -15dB, the transmission loss of the two ports < 0.6dB, the out-of-band rejection > 15dB, and the port isolation performance is good, which can meet the requirements of base station antenna.

[0058] Figure 9The return loss S11 of the phase shifter in the 700MHz-960MHz frequency band should be <-13dB in the required frequency band. Figure 10 Regarding the transmission power of each port, since this phase shifter has a symmetrical structure, only the parameters of the first output port 223, the second output port 224, and the fifth output port 228 of the left phase shifter are given. The first output port 223 corresponds to the third output port 226, and the second output port 224 corresponds to the fourth output port 227. Ports 2, 3, and 4 in the figure correspond to the fifth output port 228, the first output port 223, and the second output port 224 of the phase shifter in this scheme, respectively. As can be seen from the figure, when the phase shifter plate moves, the power fluctuation remains at a relatively stable level, which is -4±1dB, -8±1dB, and -11.5±1dB, respectively, with a power ratio of approximately 1:0.6:0.3. Overall, it conforms to the Chebyshev array power distribution law of "large in the middle and small on both sides". Figure 11 The figure shows the continuous phase change trend of each port when the phase shifter plate is moved. As the moving distance of the phase shifter plate increases, the phase shift value of port 2 remains unchanged within a certain range (±5°); the phase shift value of port 3 is 60°-75° within the required bandwidth; the phase shift of port 4 is 110°-150°, which is close to twice the phase shift value of port 3. The overall phase shift value shows a distribution pattern of (-2φ):(-φ):0:φ:(2φ).

[0059]

[0060] The table above summarizes the performance of each device. As can be seen from the table, the port transmission power and phase shift both meet the requirements of the base station electrically adjustable antenna.

[0061] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A combiner phase shifter feed network for base station antennas, characterized in that: The assembly includes a combiner assembly (100), a phase shifter assembly (200), and a support frame (300). Both the combiner assembly (100) and the phase shifter assembly (200) are fixed on the support frame (300), and the combiner assembly (100) is spaced below the phase shifter assembly (200). The combiner output port (115) of the combiner assembly (100) is connected to the phase shifter input port (221) of the phase shifter assembly (200). The combiner assembly (100) includes a combiner base plate (110) fixed on the support frame (300). The combiner base plate (110) is provided with a first input port (111), a second input port (112), and an output port (115). The first input port (111) is connected to the output port (115) through a first filter channel (113), and the second input port (112) is connected to the output port (115) through a second filter channel (114). The phase shifter assembly (200) includes a cavity (210), a phase shifter substrate (220), a support clamp (230), a first phase shifter plate (240), and a pull rod (250). The cavity (210) is open on the left and right sides. The support clamp (230) is fixed on the cavity (210). The phase shifter substrate (220) is fixed on the support clamp (230). The phase shifter substrate (220) is located inside the cavity (210) and is spaced apart from the inner wall of the cavity (210). The first phase shifter plate (240) is located inside the cavity (210). One end of the pull rod (250) is located outside the cavity (210), and the other end is connected to the first phase shifter plate (240). The phase shifter substrate (220) is provided with a phase shifter input port (221). The phase shifter input port (221) is connected to a first microstrip line (222) and a second microstrip line (225). The first microstrip line (222) and the second microstrip line (225) are symmetrically arranged on the left and right sides of the phase shifter input port (221). The first microstrip line (222) is connected to a first phase shifter output port (223) and a second phase shifter output port (224). The second microstrip line (225) is symmetrically connected to a third phase shifter output port (226) and a fourth phase shifter output port (227). The phase shifter input port (221) is connected to a fifth phase shifter output port (228). The first microstrip line (222) and the second microstrip line (225) are located on the upper surface of the phase shifter substrate (220). The first phase shifter plate (240) is located above the phase shifter substrate (220). The first microstrip line (222) and the second microstrip line (225) are provided with a slow wave structure, and the phases of the first output port (223), the second output port (224), the third output port (226), the fourth output port (227) and the fifth output port (228) of the phase shifter are all different.

2. The combiner phase shifter feed network for base station antennas according to claim 1, characterized in that: The first input port (111) of the combiner receives a 700-790MHz signal, and the second input port (112) of the combiner receives an 885-960MHz signal.

3. The combiner phase shifter feed network for base station antennas according to claim 1, characterized in that: The combiner substrate (110) is an FR4 substrate.

4. The combiner phase shifter feed network for a base station antenna according to claim 1, characterized in that: The phase shifter plate (240) is slidably connected to the phase shifter substrate (220).

5. The combiner phase shifter feed network for a base station antenna according to claim 1, characterized in that: The first output port (223), the second output port (224), the third output port (226), the fourth output port (227), and the fifth output port (228) of the phase shifter are all located on the front side of the phase shifter substrate (220).

6. The combiner phase shifter feed network for a base station antenna according to claim 1, characterized in that: The lower surface of the phase shifter substrate (220) is provided with a third microstrip line and a fourth microstrip line. The third microstrip line is connected to the phase shifter input port (221), the phase shifter first output port (223) and the phase shifter second output port (224). The fourth microstrip line is connected to the phase shifter input port (221), the phase shifter third output port (226) and the phase shifter fourth output port (227). The phase shifter assembly (200) also includes a second phase shifter plate, which is located below the phase shifter substrate (220) and is connected to the pull rod (250).

7. The combiner phase shifter feed network for a base station antenna according to claim 1, characterized in that: The cavity (210) is a rectangular aluminum plate, and the phase shifter substrate (220) and the first phase shifter plate (240) are both FR4 substrates.

Images