Radio frequency device, antenna system, and base station

Abstract

The present application relates to the technical field of radio frequency, and discloses a radio frequency device, an antenna system, and a base station. The radio frequency device synthesizes a first signal and a second signal into a third signal, divides the third signal into the first signal and the second signal, and comprises a first 90-degree bridge, a second 90-degree bridge, a first filter, and a second filter. In the first 90-degree bridge, a first port and a second port are mutually isolated ports, the first port and a fourth port are mutually straight-through ports, and the fourth port is connected to a signal absorption load. A first port and a second port of the second 90-degree bridge are mutually isolated ports. In the first 90-degree bridge and the second 90-degree bridge, the two first ports are connected by means of the first filter, and the two second ports are connected by means of the second filter. The working frequency band of the first 90-degree bridge and the working frequency band of the second 90-degree bridge cover the frequency of the first signal and the frequency of the second signal. The working frequency band of the first filter and the working frequency band of the second filter cover the frequency of the first signal but do not cover the frequency of the second signal. The radio frequency device is a non-reflecting device, so that resonance can be weakened.

Description

RF devices, antenna systems and base stations

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 11, 2023, with application number 202311016830.9 and application name “RF device, antenna system and base station”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of radio frequency technology, and in particular to a radio frequency device, an antenna system, and a base station. Background Art

[0003] With the advancement of communication technology, base station antennas are becoming increasingly important in wireless communication systems. To meet the demands of diverse application scenarios, base station antennas are becoming increasingly integrated. For example, current standalone electrically adjustable frequency-dividing antenna systems typically incorporate components such as cascaded radiating elements, radiating element frequency-dividing combiners, main feed combiners, phase shifters, power splitters, and filters.

[0004] However, existing radiators, combiners, phase shifters, power splitters, and filters are all reflective devices. Within specific frequency bands, these devices are in a standing wave matching state, meaning the output impedance of the signal source matches the input impedance of the load, allowing the signal to be fully transmitted through the transmission line to the load. However, within other frequency bands, these components are in a standing wave mismatch state, meaning the output impedance of the signal source does not match the input impedance of the load, causing some signal reflection. When these reflective devices are cascaded, they resonate within certain frequency bands, causing signal attenuation, distortion, or interference, which in turn affects the performance of the antenna system.

[0005] Summary of the Invention

[0006] To address the above issues, the present application provides a radio frequency device, antenna system, and base station. The radio frequency device is a non-reflective device that eliminates unnecessary signals during transmission, thereby achieving a non-reflective effect, effectively weakening the above-mentioned resonance phenomenon, and further improving operating performance.

[0007] In a first aspect, the present application provides a radio frequency device for synthesizing a first signal and a second signal into a third signal, or dividing the third signal into a first signal and a second signal; the radio frequency device includes a first 90° bridge, a second 90° bridge, a first filter and a second filter, wherein the first port of the first 90° bridge and the second port of the first 90° bridge are isolated ends from each other, the first port of the first 90° bridge and the fourth port of the first 90° bridge are straight-through ends from each other, and the fourth port of the first 90° bridge is connected to a signal absorbing load; the first port of the second 90° bridge and the second port of the second 90° bridge are isolated ends from each other; the first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter; the operating frequency band of the first 90° bridge and the operating frequency band of the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency band of the first filter and the operating frequency band of the second filter cover the frequency of the first signal, but do not cover the frequency of the second signal.

[0008] The above-mentioned RF device, by reasonably designing the connection relationship between the first 90° bridge, the second 90° bridge, the first filter and the second filter, can realize the combining and branching functions while effectively preventing unnecessary signals from being reflected out of the input port, thereby achieving a reflection-free effect, and thus enabling the RF device to have good working performance.

[0009] In one possible implementation of the first aspect, the second port of the second 90° bridge and the third port of the second 90° bridge are direct-through ports to each other; the third port of the first 90° bridge is used to receive a first signal, and the third port of the second 90° bridge is used to receive a second signal. When the first signal is input to the third port of the first 90° bridge and the second signal is input to the third port of the second 90° bridge, the fourth port of the second 90° bridge can output a third signal synthesized from the first and second signals. Alternatively, the fourth port of the second 90° bridge is used to receive a third signal. When the third signal is input to the fourth port of the second 90° bridge, the third port of the first 90° bridge can output the first signal, and the third port of the second 90° bridge can output the second signal.

[0010] In a second aspect, the present application provides a radio frequency device for filtering a third signal, wherein the third signal includes a first signal and a second signal; the radio frequency device includes a first 90° bridge, a second 90° bridge, a first filter, and a second filter. In which, the first port of the first 90° bridge and the second port of the first 90° bridge are mutually isolated terminals, the first port of the first 90° bridge and the fourth port of the first 90° bridge are mutually straight-through terminals, the first port of the second 90° bridge and the second port of the second 90° bridge are mutually isolated terminals, the second port of the second 90° bridge and the third port of the second 90° bridge are mutually straight-through terminals, and the fourth port of the first 90° bridge and the third port of the second 90° bridge are respectively connected to a signal absorbing load. The first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter. The operating frequency bands of the first 90° bridge and the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency bands of the first filter and the second filter cover the frequency of the first signal, but do not cover the frequency of the second signal.

[0011] The above-mentioned RF device, by reasonably designing the connection relationship between the first 90° bridge, the second 90° bridge, the first filter and the second filter, can not only realize the filtering function, but also effectively prevent unnecessary signals from being reflected out of the input port, thereby achieving a reflection-free effect, and thus enabling the RF device to have good working performance.

[0012] In a possible implementation of the second aspect, one of the third port of the first 90° bridge and the fourth port of the second 90° bridge is used to receive the third signal, and the other port is used to output the first signal.

[0013] In a third aspect, the present application provides a radio frequency device for filtering a third signal, wherein the third signal is composed of a first signal and a second signal; the radio frequency device includes a first 90° bridge, a second 90° bridge, a first filter, and a second filter. The first port of the first 90° bridge and the second port of the first 90° bridge are mutually isolated terminals, the first port of the first 90° bridge and the fourth port of the first 90° bridge are mutually direct terminals, and the third port of the first 90° bridge and the fourth port of the first 90° bridge are respectively connected to a signal absorbing load. The first port of the second 90° bridge and the second port of the second 90° bridge are mutually isolated terminals. The first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter. The operating frequency band of the first 90° bridge and the operating frequency band of the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency band of the first filter and the operating frequency band of the second filter cover the frequency of the first signal and do not cover the frequency of the second signal.

[0014] The above-mentioned RF device, by reasonably designing the connection relationship between the first 90° bridge, the second 90° bridge, the first filter and the second filter, can not only realize the filtering function, but also effectively prevent unnecessary signals from being reflected out of the input port, thereby achieving a reflection-free effect, and thus enabling the RF device to have good working performance.

[0015] In a possible implementation of the third aspect, one of the third port of the second 90° bridge and the fourth port of the second 90° bridge is used to receive the third signal, and the other port is used to output the second signal.

[0016] In a possible implementation of the first, second, or third aspect, a first bridge arm between the first port and the second port of the first 90° bridge is grounded; and / or a second bridge arm between the third port and the fourth port of the first 90° bridge is grounded. This further improves the operating performance of the first 90° bridge.

[0017] In a possible implementation of the first aspect, the second aspect, or the third aspect, in the first 90° bridge, the midpoint of the third bridge arm between the first port and the fourth port and the midpoint of the fourth bridge arm between the second port and the third port are connected through a fifth bridge arm, and the lengths of the third bridge arm and the fourth bridge arm are both λ / 2, where λ is the wavelength of the signal at the center frequency of the operating frequency band of the first 90° bridge.

[0018] The first 90° bridge mentioned above can effectively increase the working bandwidth and improve the working performance by adding the fifth bridge arm.

[0019] In a possible implementation of the first aspect, the second aspect, or the third aspect, the third bridge arm and the fourth bridge arm of the first 90° bridge are respectively in a zigzag shape.

[0020] According to the implementation mode of the present application, the third bridge arm and the fourth bridge arm of the first 90° bridge are both zigzag in shape, which can effectively reduce the size occupied by the third bridge arm and the fourth bridge arm, thereby reducing the size of the first 90° bridge, which is conducive to the miniaturization of the first 90° bridge.

[0021] In a possible implementation of the first, second, or third aspect, a first bridge arm between the first and second ports of the second 90° bridge and / or a second bridge arm between the third and fourth ports of the second 90° bridge are grounded, thereby further improving the operating performance of the second 90° bridge.

[0022] In a possible implementation of the first, second or third aspect, in the second 90° bridge, the midpoint of the third bridge arm between the first port and the fourth port and the midpoint of the fourth bridge arm between the second port and the third port are connected through a fifth bridge arm, and the length between the third bridge arm and the fourth bridge arm is λ / 2, where λ is the wavelength of the signal at the center frequency of the operating frequency band of the second 90° bridge; the third bridge arm and the fourth bridge arm of the second 90° bridge are respectively zigzag shapes.

[0023] The addition of the fifth arm to the second 90° bridge effectively increases operating bandwidth and improves performance. Furthermore, the zigzag shape of the third and fourth arms of the second 90° bridge effectively reduces the size of the third and fourth arms, thereby reducing the size of the second 90° bridge and facilitating its miniaturization.

[0024] In a possible implementation of the first, second or third aspect, the RF device further includes a substrate, the first 90° bridge and the second 90° bridge are respectively arranged on the same side of the substrate, a metal layer is provided on the side of the substrate facing away from the first 90° bridge and the second 90° bridge, and the first filter and the second filter are arranged on the metal layer.

[0025] The substrate can play a supporting role. In addition, the metal layer can provide reliable grounding and conductive functions.

[0026] In a possible implementation of the first aspect, the second aspect, or the third aspect, the first filter and the second filter are dielectric substrate filters or cavity filters.

[0027] In a possible implementation of the first aspect, the second aspect, or the third aspect, the first filter and the second filter are cavity filters, and the substrate is a tuning cover plate of the cavity filter.

[0028] When the substrate serves as a tuning cover for the first filter and the second filter, the first filter and the second filter do not need to be provided with an additional tuning cover, thereby reducing the number of components and facilitating low cost and miniaturization.

[0029] In a possible implementation of the first aspect, the second aspect or the third aspect, a plurality of resonators are provided in the cavity of the cavity filter, a substrate is covered on the opening of the cavity, a plurality of tuning sleeves are provided on the metal layer, a tuning screw is fixed in each tuning sleeve, and the plurality of tuning screws correspond one-to-one to the plurality of resonators.

[0030] Based on this, the frequency of the resonator can be adjusted by adjusting the depth of each tuning screw entering the corresponding resonator, thereby meeting the working requirements in different application scenarios.

[0031] In a possible implementation of the first aspect, the second aspect or the third aspect, the first port and the second port of the first 90° bridge are respectively connected to the first filter and the second filter through metallized vias or filter port connecting pins; the first port and the second port of the second 90° bridge are respectively connected to the first filter and the second filter through metallized vias or filter port connecting pins.

[0032] In a possible implementation of the first aspect, the second aspect, or the third aspect, the substrate includes any one of a glass substrate, a plastic substrate, a ceramic substrate, or a printed circuit board.

[0033] In a fourth aspect, the present application provides an antenna system, comprising a radiating unit and a radio frequency device of any one of the first aspect, a possible implementation of the first aspect, the second aspect, a possible implementation of the second aspect, the third aspect and a possible implementation of the third aspect, wherein the radio frequency device is connected to the radiating unit.

[0034] In a fifth aspect, the present application provides a base station, comprising an antenna mounting frame and the antenna system according to the fourth aspect, wherein the antenna system is installed on the antenna mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 shows an exemplary structural diagram of a 90° bridge;

[0036] FIG2 shows a schematic structural diagram of a base station in an embodiment of the present application;

[0037] FIG3 shows a schematic block diagram of the structure of an antenna system in an embodiment of the present application;

[0038] 4A to 4C are schematic diagrams showing several feeding networks in an antenna system according to an embodiment of the present application;

[0039] FIG5 shows a schematic block diagram of the structure of a radio frequency device in an embodiment of the present application;

[0040] 6A and 6B are schematic diagrams showing the transmission of signals S1 and S2 in a radio frequency device according to an embodiment of the present application;

[0041] FIG7A shows a transmission diagram of a signal S2 input from the third port of the first 90° bridge in some embodiments;

[0042] FIG7B shows a transmission diagram of a signal S1 input from the third port of the second 90° bridge in some embodiments;

[0043] 8A to 8C show a first structural diagram of a radio frequency device according to an embodiment of the present application, wherein FIG8A is a side view of the radio frequency device, FIG8B is a top view of the radio frequency device, and FIG8C is a bottom view of the radio frequency device;

[0044] 9A to 9C show a second schematic structural diagram of a radio frequency device according to an embodiment of the present application, wherein FIG9A is a side cross-sectional view of the radio frequency device, FIG9B is a first top view of the radio frequency device, and FIG9C is a second top view of the radio frequency device, wherein the first 90° bridge, the second 90° bridge, and the substrate are not shown;

[0045] FIG10 shows an exemplary structural diagram of a substrate used as a tuning cover in an embodiment of the present application;

[0046] FIG11A shows an exemplary connection method 1 between the first port of the first 90° bridge and the first connection port of the first filter in an embodiment of the present application;

[0047] FIG11B shows a second exemplary connection method between the first port of the first 90° bridge and the first connection port of the first filter in an embodiment of the present application;

[0048] FIG12 is a schematic diagram showing filtering of a radio frequency device in some embodiments of the present application;

[0049] FIG13 shows a schematic diagram of radio frequency device filtering in other embodiments of the present application. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0051] It should be understood that the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" in this article is just a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solution of this application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit differences.

[0052] For the convenience of understanding the technical solution of this application, some concepts or terms involved in this application will be explained first.

[0053] 90° hybrid: A 90° hybrid can include four arms and four ports. The four arms are connected end to end to form a quadrilateral loop. Each port is located at the connection of two adjacent arms. When one port is used as the input end, the remaining three ports are the isolation end, the through end, and the coupling end respectively. When a signal is input from the input end, it can be divided into two equal-amplitude signals and output from the coupling end and the through end respectively. And, the phase of the signal output from the coupling end lags behind the phase of the signal output from the through end by 90°.

[0054] Specifically, FIG. 1 shows an exemplary structural diagram of the 90° hybrid 2. As shown in FIG. 1, the 90° hybrid 2 includes a first arm 21, a second arm 22, a third arm 23, and a fourth arm 24, and a first port a, a second port b, a third port c, and a fourth port d.

[0055] Among them, the first arm 21, the fourth arm 24, the second arm 22, and the third arm 23 are connected end to end to form a structure similar to a "square" shape. The first port a is located at the connection A between the first arm 21 and the third arm 23. The second port b is located at the connection B between the first arm 21 and the fourth arm 24. The port c is located at the connection C between the second arm 22 and the fourth arm 24. The port d is located at the connection D between the second arm 22 and the third arm 23.

[0056] The path lengths from connection A to connection B (i.e., the length of first bridge arm 21), from connection B to connection C, from connection C to connection D (i.e., the length of second bridge arm 22), and from connection D to connection A are all λ / 4, where λ is the wavelength of the signal at the center frequency of the operating frequency band of 90° bridge 2. The characteristic impedances of first bridge arm 21 and second bridge arm 22 are both Z_0. The characteristic impedances of third bridge arm 23 and fourth bridge arm 24 are both Z_0 / √2. The characteristic impedances of all four ports a through d are all Z_0.

[0057] The 90° bridge 2 can split an input signal into two outputs of equal amplitude and a 90° phase difference. For example, when the signal S0 is input from the third port c, it is divided into a signal S01 and a signal S02. The signal S01 can be output from the first port a, and the signal S02 can be output from the second port b. The amplitudes of the signals S01 and S02 are equal, and the phase of the signal S01 lags the phase of the signal S02 by 90°. For example, if the phase of the signal S0 can be 0°, then the phase of the signal S01 can be -180°, and the phase of the signal S02 can be -90°. There is no signal output from the fourth port d. At this time, the third port c is called the input port, the first port a is called the coupling port, the second port b is called the through port, and the fourth port d is called the isolation port.

[0058] The 90° bridge 2 can also combine two input signals of equal amplitude and a 90° phase difference into one output. For example, when signal S01 is input to the first port a and signal S02 is input to the second port b, signals S01 and S02 can cancel each other out at the third port c and be combined and output at the fourth port d. Specifically, when signal S01 is input to the first port a as the input, the second port b is the isolation port, the third port c is the coupling port, and the fourth port d is the through port. Based on the branching characteristics of the 90° bridge 2, the third port c can output signal S011, and the fourth port d can output signal S012. Signals S011 and S012 have equal amplitudes, and the phase of signal S011 (e.g., -360°) lags the phase of signal S012 (e.g., -270°) by 90°. When signal S02 is input to the second port b as the input, port a is the isolation port, the third port c is the through port, and the fourth port d is the coupling port. According to the branch characteristics of the above-mentioned 90° bridge 2, the third port c can output signal S021, and the fourth port d can output signal S022. The amplitudes of signal S021 and signal S022 are equal, and the phase of signal S022 (for example, -270°) lags 90° compared to the phase of signal S022 (for example, -180°). In summary, at the third port c, signal S011 and signal S021 are equal-amplitude and opposite-phase signals, signal S011 and signal S021 cancel each other, and no signal is output from the third port c. At the fourth port d, signal S012 and signal S022 are equal-amplitude and same-phase signals, signal S012 and signal S022 are combined and output from the fourth port d.

[0059] Conversely, when the first port a inputs a signal S02 and the second port b inputs a signal S01, the signals S01 and S02 can be combined at the third port c and cancel each other out at the fourth port d. The specific transmission process of the signal S02 at the first port a and the signal S01 at the second port b can be referenced to the specific transmission process of the signal S01 at the first port a and the signal S02 at the second port b, and will not be further described here.

[0060] It can be understood that the above-mentioned 90° bridge 2 is a reciprocal structure, and any port among ports a to d can be used as an input port, and the corresponding isolation port and output port will also change position as the input port changes.

[0061] For example, the first port a and the second port b are isolated ports. That is, when either port a is an input port, the other port is an isolated port. The second port b and the third port c are pass-through ports. That is, when either port b is an input port, the other port is a pass-through port. The third port c and the fourth port d are also isolated ports, and the fourth port d and the first port a are also pass-through ports.

[0062] It is understandable that the above-mentioned 90° bridge 2 can also be implemented in other forms besides the structure shown in Figure 1, as long as the function of the 90° bridge 2 can be achieved, and this application does not limit it.

[0063] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0064] The present application provides a radio frequency device, an antenna system, and a base station. The radio frequency device provided in the present application is a non-reflective device that can effectively weaken the resonance phenomenon caused by the cascade of various frequency-selective devices and has good operating performance. The antenna system may include, but is not limited to, any one or more of a passive antenna or a multiple-input multiple-output (MIMO) system antenna.

[0065] Figure 2 shows a schematic diagram of the structure of base station 1 in an embodiment of the present application. Referring to Figure 2, base station 1 includes an antenna system 01, an antenna adjustment bracket 02, a mast 03 (serving as an "antenna mounting frame"), an outdoor jumper 04, a feeder 05, a joint seal 06, and a grounding device 07.

[0066] The antenna system 01 is mounted on the pole 03 via the antenna adjustment bracket 02 to facilitate the reception or transmission of signals by the antenna system 01 .

[0067] One end of the feeder line 05 is connected to the antenna system 01 through the outdoor jumper 04 , and the other end of the feeder line 05 is connected to a transmitting device (not shown) so that signals can be transmitted between the transmitting device and the antenna system 01 .

[0068] The joint seal 06 is provided at the connection between the antenna system 01 and the outdoor jumper 04 and at the connection between the outdoor jumper 04 and the feeder 05 to provide insulation and sealing. The joint seal 06 can be an insulating sealing tape or polyvinyl chloride (PVC) insulating adhesive.

[0069] The grounding device 07 is provided on the feeder 05. The grounding device 07 can play the role of electrical grounding, lightning protection, overvoltage protection and equipment performance maintenance, etc., which helps to ensure the stability and safety of the base station 1.

[0070] FIG3 shows a schematic block diagram of the structure of an antenna system 01 according to an embodiment of the present application. As shown in FIG3 , the antenna system 01 includes a feeding network 10 , a radiation unit 11 , a reflector 12 , an antenna connector 13 , and a radome 14 .

[0071] The feed network 10, the radiation unit 11, and the reflector 12 are all located in the radome 14. The radome 14 has good electromagnetic wave penetration characteristics in terms of electrical performance and can withstand the influence of harsh external environments in terms of mechanical performance, thereby protecting the antenna system 01 from external environmental influences.

[0072] The radiation unit 11 is provided on one side surface of the reflector 12 and is connected to the antenna connector 13 through the feed network 10. The radiation unit 11 may also be referred to as an antenna unit, antenna element, or element. The radiation unit 11 is a unit constituting the basic structure of the antenna array, which can effectively send or receive antenna signals. In the antenna system 01, the frequencies of different radiation units 11 may be the same or different. The reflector 12 may also be referred to as a base plate, an antenna panel, or a reflective panel, etc. For example, the reflector 12 may be made of metal. When the antenna system 01 receives a signal, the reflector 12 may reflect the antenna signal and focus it on the receiving point, thereby achieving directional reception.

[0073] The feeding network 10 is usually composed of a cascade of multiple radio frequency devices. The feeding network 10 can feed the signal to the radiating unit 11 according to a certain amplitude and phase, or send the received signal to the baseband processing unit (not shown) connected to the antenna connector 13 according to a certain amplitude and phase. The feeding network 10 may include a phase shifter 101, a transmission component 102, and a calibration network 103. Among them, the phase shifter 101 can be used to change the maximum direction of signal radiation of the antenna system 01. The phase shifter 101 can be connected to the transmission component 102 to achieve different radiation beam pointing through the transmission component 101. Alternatively, the phase shifter 101 can also be connected to the calibration network 102 to obtain the calibration signal required by the system.

[0074] In addition, the feed network 10 may also include RF components such as a combiner 104 or a filter 105 to enhance performance. Combiner 104 can combine multiple input signals of different frequencies into a single output. Alternatively, when used in reverse, combiner 104 can split a single input signal into multiple outputs based on frequency. Filter 105 can filter out interference signals and improve signal transmission.

[0075] The feed network 10 can have different cascade architectures to meet the feeding requirements in different application scenarios. For example, Figures 4A to 4C show schematic diagrams of several feed networks 10 in the antenna system 01 according to an embodiment of the present application.

[0076] In some embodiments of the present application, the feeding network 10 in the antenna system 01 can be in the form of a 1t3 array, that is, one port corresponds to three radiating elements. Referring to Figure 4A, the feeding network 10 may include a phase shifter 101, a filter 105, and a power divider 106. Among them, the three radiating elements 11 are connected to one end of the phase shifter 101 through the power divider 106. The other end of the phase shifter 101 is connected to the filter 105. The port port1 of the filter 105 can be used to connect other devices (for example, the above-mentioned antenna connector 13). In this way, the feeding network 10 can synthesize the three signals emitted by the three radiating elements 11 into one output, or divide the signal of a specific frequency into three paths as required and feed them to the three radiating elements 11 respectively.

[0077] In some other embodiments of the present application, the feeding network 10 in the antenna system 01 can also be in the form of a 2t3 array, that is, two ports correspond to three radiating elements. Referring to Figure 4B, the feeding network 10 may include a phase shifter 101, a combiner 104, and a power divider 106. Among them, the three radiating elements 11 are connected to one end of the phase shifter 101 through the power divider 106. The other end of the phase shifter 101 is connected to the combiner 104. Ports port1 and port2 of the combiner 104 can be used to connect other devices (for example, the above-mentioned antenna connector 13). In this way, the feeding network 10 can convert the three signals emitted by the three radiating elements 11 into two outputs, or convert the two signals into three signals and feed them to the three radiating elements 11 respectively.

[0078] In some other embodiments of the present application, the feed network 10 in the antenna system 01 may also have a more complex cascade architecture to achieve the independent electrical frequency adjustment and division function of the antenna system 01. Referring to Figure 4C, the feed network 10 may include two phase shifters 101, a main feed combiner 104a, and five unit combiners 104b. It should be noted that Figure 4c only shows two of the unit combiners 104b, and the remaining three unit combiners 104b are replaced by ellipsis. Among them, the five radiating elements 11 correspond one-to-one to the five unit combiners 104b. Each radiating element 11 is connected to the port 1 of the corresponding unit combiner 104b. The port 2 and port 3 of each unit combiner 104b are respectively connected to one end of the two phase shifters 101. The other ends of the two phase shifters 101 are respectively connected to the port 2 and port 3 of the main feed combiner 104a. Port 1 of the main feed combiner 104a can be connected to other devices (e.g., the antenna connector 13 described above). In this way, the feed network 10 can separate the five signals emitted by the five radiating elements 11 into signals of different frequency bands (e.g., Band 1 and Band 2), and then, after processing the signals in each frequency band, combine them into one signal for output, thereby achieving the independent electrical frequency division function of the antenna system 01.

[0079] In some technical solutions, the RF devices in the feed network (e.g., phase shifters, combiners, filters, and power dividers) are all reflective devices with certain frequency selection characteristics. After these reflective devices are cascaded to form the feed network 10 of the antenna system 01, they will produce resonance in certain frequency bands, thereby causing problems such as signal attenuation, distortion, or interference, thereby affecting the working performance of the antenna system 01. In order to weaken the resonance phenomenon, it is necessary to redesign a RF device (e.g., a reflectionless combiner, a reflectionless filter, a reflectionless power-divider, or a reflectionless phase-shifter, etc.) to achieve a reflection-free effect.

[0080] In order to solve the above problems, the present application provides a radio frequency device, which is a non-reflective device that can eliminate unnecessary signals during transmission, thereby achieving a non-reflective effect, effectively weakening the above-mentioned resonance phenomenon, and further improving working performance. It is described in detail below with reference to the accompanying drawings.

[0081] FIG. 5 shows a schematic block diagram of the radio frequency device 100 in an embodiment of the present application. As shown in FIG. 5, the radio frequency device 100 includes a first 90° bridge 110, a second 90° bridge 120, a first filter 130, and a second filter 140.

[0082] Specifically, the first 90° bridge 110 includes a first port a1, a second port b1, a third port c1, and a fourth port d1. Among them, the first port a1 and the second port b1 are isolation ports for each other, and the first port a1 and the fourth port d1 are through ports for each other.

[0083] Exemplarily, the first 90° bridge 110 includes a first bridge arm 111, a second bridge arm 112, a third bridge arm 113, and a fourth bridge arm 114. Among them, the first bridge arm 111, the fourth bridge arm 114, the second bridge arm 112, and the third bridge arm 113 are connected end to end to form a structure similar to a "square" shape. The first port a1 can be located at the connection between the first bridge arm 111 and the third bridge arm 113. The second port b1 can be located at the connection between the first bridge arm 111 and the fourth bridge arm ۱۱۴. The third port c1 can be located at the connection between the second bridge arm 112 and the fourth bridge arm 114. The fourth port d1 can be located at the connection between the second bridge arm 112 and the third bridge arm 113.

[0084] The second 90° bridge 120 includes a first port a2, a second port b2, a third port c2, and a fourth port d2. Similarly, the first port a2 and the second port b2 are isolation ports for each other.

[0085] Exemplarily, the second 90° bridge 120 includes a first bridge arm 121, a second bridge arm 122, a third bridge arm 123, and a fourth bridge arm 124. Among them, the first bridge arm 121, the fourth bridge arm 124, the second bridge arm 122, and the third bridge arm 123 are connected end to end to form a structure similar to a "square" shape. The first port a2 can be located at the connection between the first bridge arm 121 and the third bridge arm 123. The second port b2 can be located at the connection between the first bridge arm 121 and the fourth bridge arm 124. The third port c2 can be located at the connection between the second bridge arm 122 and the fourth bridge arm 124. The fourth port d2 can be located at the connection between the second bridge arm 122 and the third bridge arm 123.

[0086] The first port a1 of the first 90° bridge 110 is connected to the first port a2 of the second 90° bridge 120 through the first filter 130. The second port b1 of the first 90° bridge 110 is connected to the second port b2 of the second 90° bridge 120 through the second filter 140. The fourth port d1 of the first 90° bridge 110 is connected to the signal absorbing load 150. The above-mentioned RF device 100 can realize different signal transmission functions (for example, a combining function or a branching function) while achieving a reflection-free effect. To facilitate understanding of the signal transmission function and the reflection-free effect of the above-mentioned RF device 100, the following description is made in conjunction with the signal transmission process in the RF device 100.

[0087] For example, Figures 6A and 6B show schematic diagrams of the transmission of signal S1 and signal S2 in the radio frequency device 100 in an embodiment of the present application. In conjunction with Figures 6A and 6B, the operating frequency band of the first 90° bridge 110 and the operating frequency band of the second 90° bridge 120 both cover the frequency of signal S1 (as the first signal) and the frequency of signal S2 (as the second signal). The operating frequency band of the first filter 130 and the operating frequency band of the second filter 140 both cover the frequency of the first signal S1 and do not cover the frequency of the second signal S2. In other words, the first signal S1 can pass through the first filter 130 and the second filter 140. However, the second signal S2 cannot pass through the first filter 130 and the second filter 140.

[0088] When signal S1 is input from the third port c1 of the first 90° bridge 110 and signal S2 is input from the third port c2 of the second 90° bridge 120, the signal synthesized by signals S1 and S2 (as the third signal) can be output from the fourth port d2 of the second 90° bridge 120, thereby achieving the combining function of the RF device 100. Conversely, when signals S1 and S2 are simultaneously input from the fourth port d2 of the second 90° bridge 120, signal S1 can be output from the third port c1 of the first 90° bridge 110 and signal S2 can be output from the third port c2 of the second 90° bridge 120, thereby achieving the branching function of the RF device 100. Based on this, the RF device 100 can be used as the combiner 104 in Figure 4B or the main feed combiner 104a or unit combiner 104b in Figure 4C. The combiners (eg, combiner 104 , combiner 104 a , and combiner 104 b ) are non-reflective combiners, which can effectively weaken the resonance phenomenon, thereby improving the working performance of the feeding network 10 .

[0089] It can be understood that the branch transmission process of signal S1 and signal S2 is the inverse process of the combined transmission process of signal S1 and signal S2. For ease of description, the combined transmission process of signal S1 and signal S2 is introduced as an example below.

[0090] Specifically, according to the characteristics of the aforementioned 90° bridge 2, when signal S1 is input from the third port c1 of the first 90° bridge 110, signal S1 is divided into signal S11 and signal S12. Signal S11 is output from the first port a1, and signal S12 is output from the second port b1. The amplitudes of signal S11 and signal S12 are equal, and the phase of signal S11 lags the phase of signal S12 by 90°. Signal S11 can pass through the first filter 130 and enter the first port a2 of the second 90° bridge 120. Signal S12 can pass through the second filter 140 and enter the second port b2 of the second 90° bridge 120. Signals S11 and S12 can cancel each other out at the third port c2 of the second 90° bridge 120 and be combined into signal S1 at the fourth port d2 of the second 90° bridge.

[0091] According to the aforementioned characteristics of the 90° bridge, when signal S2 is input to the third port c2 of the second 90° bridge 120, signal S2 is split into signal S21 and signal S22. Signal S21 is output from the first port a2, and signal S22 is output from the second port b2. Signals S21 and S22 have equal amplitudes, and the phase of signal S21 lags by 90° compared to the phase of signal S22. Because the frequency band of signal S2 falls outside the passband of the first filter 130 and the second filter 140, signal S21 is reflected back to the first port a2 by the first filter 130, and signal S22 is reflected back to the second port b2 by the second filter 140. The reflected signals S21 and S22 are also canceled out at the third port c2 of the second 90° bridge 120 and combined into signal S2 at the fourth port d2 of the second 90° bridge 120. As a result, the signal S1 and the signal S2 can be combined at the fourth port d2 of the second 90° bridge 120 , thereby achieving the combining function of the radio frequency device 100 .

[0092] When non-corresponding signals are input to the third port c1 of the first 90° bridge 110 or the third port c2 of the second 90° bridge 120 , these signals can be eliminated during the transmission process, thereby achieving a reflection-free effect.

[0093] For example, FIG7A shows a transmission diagram of a signal S2 input from the third port c1 of the first 90° bridge 110 in some embodiments. Referring to FIG7A , when the RF device 100 is operating normally, the signal corresponding to the third port c1 of the first 90° bridge 110 is signal S1. When signal S2 is input from the third port c1 of the first 90° bridge 110, based on the aforementioned characteristics of the 90° bridge, the first port a1 can output signal S21, and the second port b1 can output signal S22. Signals S21 and S22 have equal amplitudes, and the phase of signal S21 lags the phase of signal S22 by 90°. Because the frequency band of signal S2 is outside the passband of the first filter 130 and the second filter 140, signal S21 is reflected back to the first port a1 by the first filter 130, and signal S22 is reflected back to the second port b1 by the second filter 140. The reflected signals S21 and S22 cancel each other out at the third port c1 and are combined into signal S2 at the fourth port d1. Signal S2 is then absorbed by the signal-absorbing load 150 connected to the fourth port d1. In this way, signal S2 input from the first 90° bridge 110 is eliminated during transmission without being reflected out of the first 90° bridge 110, thereby achieving a reflection-free effect.

[0094] For another example, FIG7B shows a transmission diagram of a signal S1 input from the third port c2 of the second 90° bridge 120 in some embodiments. Referring to FIG7B , when the RF device 100 is operating normally, the signal corresponding to the third port c2 of the second 90° bridge 120 is signal S2. When the signal S1 is input from the third port c2 of the second 90° bridge 120, according to the characteristics of the aforementioned 90° bridge, the first port a2 can output signal S11, and the second port b2 can output signal S12. The amplitudes of the signals S11 and S12 are equal, and the phase of the signal S11 lags the phase of the signal S12 by 90°. The signal S11 can pass through the first filter 130 and enter the first port a1 of the first 90° bridge 110. The signal S12 can pass through the second filter 140 and enter the second port b1 of the first 90° bridge 110. Signals S11 and S12 can also be offset at the third port c1 of the first 90° bridge 110 and combined into signal S1 at the fourth port d1 of the first 90° bridge 110. Signal S1 is absorbed by the signal-absorbing load 150 connected to the fourth port d1. In this way, signal S1 input from the second 90° bridge 120 can be eliminated during transmission, achieving a reflection-free effect.

[0095] In summary, the above-mentioned RF device 100, by reasonably designing the connection relationship between the first 90° bridge 110, the second 90° bridge 120, the first filter 130 and the second filter 140, can realize the combining and branching functions while effectively preventing unnecessary signals from being reflected out of the input port, thereby achieving a reflection-free effect, and thus enabling the RF device 100 to have good working performance.

[0096] The specific structures of the components in the radio frequency device 100 are further described below with reference to the accompanying drawings.

[0097] 8A to 8C show a structural schematic diagram 1 of the RF device 100 in an embodiment of the present application, wherein FIG8A is a side view of the RF device 100 , FIG8B is a top view of the RF device 100 , and FIG8C is a bottom view of the RF device 100 .

[0098] Figures 9A to 9C show a second structural schematic diagram of the RF device 100 in an embodiment of the present application, wherein Figure 9A is a side sectional view of the RF device 100, Figure 9B is a first top view of the RF device 100, and Figure 9C is a second top view of the RF device 100, wherein the first 90° bridge 110, the second 90° bridge 120 and the substrate 170 are not shown.

[0099] 8B and 9B , in some embodiments of the present application, the first arm 111 of the first 90° bridge 110 and / or the second arm 112 of the first 90° bridge 110 can be grounded to further improve the operating performance of the first 90° bridge 110. For example, the first arm 111 of the first 90° bridge 110 and the second arm 112 of the first 90° bridge 110 can be grounded through grounding holes 160, respectively.

[0100] In some embodiments of the present application, the first 90° bridge 110 may further include a fifth bridge arm 115 to further increase the operating bandwidth of the first 90° bridge 110. Specifically, as shown in Figures 8B and 9B, the two ends of the fifth bridge arm 115 are respectively connected to the midpoint of the third bridge arm 113 and the midpoint of the fourth bridge arm 114, so that the first 90° bridge 110 as a whole is similar to the shape of a "sun". Among them, the length of the third bridge arm 113 and the length of the fourth bridge arm 114 are both λ / 2. λ is the wavelength of the signal at the center frequency of the operating frequency band of the first 90° bridge 110. It can be understood that the length of the third bridge arm 113 is the length of the extension track from one end of the third bridge arm 113 to the other end of the third bridge arm 113; the length of the fourth bridge arm 114 refers to the length of the extension track from one end of the fourth bridge arm 114 to the other end of the fourth bridge arm 114.

[0101] In some embodiments of the present application, the third bridge arm 113 and the fourth bridge arm 114 of the first 90° bridge 110 are both zigzag in shape, so as to reduce the size of the third bridge arm 113 and the fourth bridge arm 114 in the X direction, thereby reducing the size of the first 90° bridge 110, which is conducive to the miniaturization of the RF device 100.

[0102] In some embodiments of the present application, the first bridge arm 121 of the second 90° bridge 120 and / or the second bridge arm 122 of the second 90° bridge 120 may be grounded to further improve the operating performance of the second 90° bridge 120. The specific manner of grounding the first bridge arm 121 of the second 90° bridge 120 and / or the second bridge arm 122 of the second 90° bridge 120 is the same as the specific manner of grounding the first bridge arm 111 of the first 90° bridge 110 and / or the first bridge arm 112 of the first 90° bridge 110 described above, and is not further described herein.

[0103] In some embodiments of the present application, the second 90° bridge 120 may also include a fifth bridge arm 125 to further increase the operating bandwidth of the second 90° bridge 120. The specific layout of the fifth bridge arm 125 of the second 90° bridge 120 is consistent with the specific layout of the fifth bridge arm 115 of the first 90° bridge 110, and is not further described here.

[0104] In some embodiments of the present application, the third bridge arm 123 and the fourth bridge arm 124 of the second 90° bridge 120 are both zigzag in shape, so as to reduce the size of the third bridge arm 123 and the fourth bridge arm 124 in the X direction, thereby reducing the size of the second 90° bridge 120, which is conducive to the miniaturization of the RF device 100.

[0105] Referring to Figures 8A, 8B, 9A, and 9B, in some embodiments of the present application, the RF device 100 further includes a substrate 170 to provide support. The substrate 170 includes a first side 171 and a second side 172. The first side 171 and the second side 172 can be arranged opposite to each other along the Z direction. For example, the Z direction is perpendicular to the X direction. Among them, the first 90° bridge 110 and the second 90° bridge 120 can be arranged on the first side 171 of the substrate 160. A metal layer 173 is provided on the second side 172 of the substrate 170 to provide reliable grounding and conductive functions. The first filter 130 and the second filter 140 are arranged on the metal layer 173.

[0106] In some embodiments of the present application, the first filter 130 and the second filter 140 may be dielectric substrate filters or cavity filters.

[0107] For example, referring to Figures 8A to 8C, the first filter 130 and the second filter 140 can both be dielectric substrate filters. Specifically, the first filter 130 includes a substrate 131, a filter circuit 132, and a shielding cover 133. The filter circuit 132 is provided on one side of the substrate 131. The shielding cover 133 covers the filter circuit 132 to shield the influence of external electromagnetic waves on the filter circuit and the electromagnetic waves generated by the filter circuit from radiating outward. Exemplarily, the filter circuit 132 includes a first connection port 1321, a second connection port 1322, and a plurality of resonators 1323. The first connection port 1321 can be used to connect to the first port a1 of the first 90° bridge 110. The second connection port 1322 can be used to connect to the first port a2 of the second 90° bridge 120.

[0108] Similarly, the second filter 140 also includes a substrate 141, a filter circuit 142 and a shielding cover 144. The filter circuit 142 is arranged on one side of the substrate 141. The shielding cover 143 covers the filter circuit 142. Among them, the substrate 131 of the first filter 130 and the substrate 141 of the second filter 140 can be an integrated structure, thereby reducing the number of components, which is conducive to achieving low cost and miniaturization of the radio frequency device 100. That is, the filter circuit 132 and the filter circuit 142 are arranged on the same substrate. The filter circuit 142 includes a first connection port 1421, a second connection port 1422 and a plurality of resonators 1423. Among them, the first connection port 1421 can be used to connect to the second port b1 of the first 90° bridge 110. The second connection port 1422 can be used to connect to the second port b2 of the second 90° bridge 120.

[0109] 9A to 9C , the first filter 130 and the second filter 140 are both cavity filters. Specifically, the first filter 130 includes a cavity 134 and a filter circuit 132 disposed in the cavity 134 .

[0110] The substrate 170 can serve as a tuning cover for the first filter 130. In this way, the first filter 130 does not need to be provided with an additional tuning cover, thereby reducing the number of components and facilitating low cost and miniaturization of the RF device 100. FIG10 shows an exemplary structural diagram of the substrate 170 as a tuning cover in an embodiment of the present application. Specifically, in combination with FIG9A , FIG9C and FIG10 , the substrate 170 can be covered on the opening of the cavity 134. A plurality of tuning sleeves 174 are provided on the metal layer 173 on the substrate 170. Exemplarily, the plurality of tuning sleeves 174 can be fixed to the metal layer 173 by welding. A tuning screw 175 is fixed in each tuning sleeve 174. Exemplarily, the tuning screw 175 can be fixed in the tuning sleeve 174 by threading. The plurality of tuning screws 175 correspond one-to-one with the plurality of resonators 1323 in the filter circuit 132. The frequency of the resonator 1323 can be adjusted by adjusting the depth to which each tuning screw 175 penetrates into the corresponding resonator 1323 .

[0111] It is understood that the specific structure of the second filter 140 when it is a cavity filter is consistent with the specific structure of the first filter 130 when it is a cavity filter, and is not further described here. It is also understood that when the second filter 140 is a cavity filter, the substrate 170 can also serve as a tuning cover for the second filter 140. The specific coordination between the substrate 170 and the second filter 140 is consistent with the specific coordination between the substrate 170 and the first filter 130, and is not further described here.

[0112] In some embodiments of the present application, the first port a1 and the second port b1 of the first 90° bridge 110 can be connected to the first filter 130 and the second filter 140, respectively, via metallized vias or filter port connection pins; and the first port a2 and the second port b2 of the second 90° bridge 120 can be connected to the first filter 130 and the second filter 140, respectively, via metallized vias or filter port connection pins. For ease of description, the following describes the connection between the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130 as an example.

[0113] Figure 11A illustrates an exemplary first connection method for connecting the first port a1 of the first 90° bridge 110 to the first connection port 1321 of the first filter 130 in an embodiment of the present application. As shown in Figure 11A , a first metallized via 176 is defined on the substrate 170, communicating with the first port a1. A second metallized via 135 is defined on the substrate 131, communicating with the first connection port 1321. The first metallized via 175 and the second metallized via 135 are aligned, enabling electrical communication between the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130.

[0114] Figure 11B illustrates a second exemplary connection method between the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130, according to an embodiment of the present application. As shown in Figure 11B , the first filter 130 includes a connection pin 136 that communicates with the first connection port 1321. The end of the connection pin 136 extends through the substrate 170 to connect to the port pad 116 corresponding to the first port a1 of the first 90° bridge 110, thereby enabling electrical communication between the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130.

[0115] In some embodiments of the present application, the substrate 170 may include but is not limited to any one of a glass substrate, a plastic substrate, a ceramic substrate or a printed circuit board (PCB), and the present application does not impose any restrictions on this.

[0116] It can be understood that this embodiment is an exemplary description of the technical solution of the present application, and those skilled in the art can make other modifications. For example, in this embodiment, the RF device 100 can be used to implement a combining function or a branching function. In other embodiments, the RF device 100 can also be used to implement a filtering function. Exemplarily, the RF device 100 with a filtering function can be used as the above-mentioned filter 105, in which case the filter 105 is a reflectionless filter. When the reflectionless filter is cascaded with other devices (for example, a reflective device with a frequency-selective characteristic), the resonance phenomenon can be effectively weakened.

[0117] Figure 12 shows a schematic diagram of filtering in RF device 100 in some embodiments of the present application. Referring to Figure 12, in some embodiments of the present application, the fourth port d1 of the first 90° bridge 110 and the third port c2 of the second 90° bridge in RF device 100 are connected to a signal-absorbing load 150, respectively. One of the third port c1 of the first 90° bridge 110 and the fourth port d2 of the second 90° bridge 120 is used to receive a signal, while the other is used to output a filtered signal.

[0118] Exemplarily, signal S3 (as the third signal) includes signal S1 and signal S2. When signal S3 is input from the third port c1 of the first 90° bridge 110, signal S1 in signal S3 can enter the second 90° bridge 120 through the first filter 130 and the second filter 140, and be output from the fourth port c2 of the second 90° bridge 120; signal S2 in signal S3 is reflected back by the first filter 130 and the second filter 140, and is eliminated during the transmission process, thereby achieving filtering processing of signal S3. Among them, the specific transmission process of signal S1 can refer to Figure 6A and its related description, which will not be repeated here. The specific process of signal S2 being eliminated can refer to Figure 7A and its related description, which will not be repeated here.

[0119] It can be understood that the filtering principle of the signal S3 input from the fourth port d2 of the second 90° bridge 120 is the same as the filtering principle of the signal S3 input from the third port c1 of the first 90° bridge 110 , which will not be described in detail here.

[0120] Figure 13 shows a schematic diagram of filtering in a radio frequency device 100 according to another embodiment of the present application. Referring to Figure 13 , in another embodiment of the present application, the third port c1 and the fourth port d1 of the first 90° bridge 110 in the radio frequency device 100 are each connected to a signal-absorbing load 150. The third port c2 and the fourth port d2 of the second 90° bridge 120 are each used to receive a signal, while the other is used to output a filtered signal.

[0121] Exemplarily, signal S3 (as the third signal) includes signal S1 and signal S2. When signal S3 is input from the third port c2 of the second 90° bridge 120, signal S1 in signal S3 can enter the first 90° bridge 110 through the first filter 130 and the second filter 140, and be eliminated during the transmission process in the first 90° bridge 110; signal S2 in signal S3 is reflected by the first filter 130 and the second filter 140 to the fourth port d2 of the second 90° bridge 120 for output, thereby achieving filtering processing of signal S3. Among them, the specific process of eliminating signal S1 can refer to Figure 7B and its related description, which will not be repeated here. The specific transmission process of signal S2 can refer to Figure 6B and its related description, which will not be repeated here.

[0122] It can also be understood that the filtering principle when the signal S3 is input from the fourth port d2 of the second 90° bridge 120 is the same as the filtering principle when the signal S3 is input from the third port c2 of the second 90° bridge 120, which will not be described in detail here.

[0123] The above describes the implementation methods of the present application by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation methods. On the contrary, the purpose of introducing the application in conjunction with the implementation methods is to cover other options or modifications that may be extended based on the claims of the present application. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details are omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other unless there is a conflict.

[0124] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "outside", "inside", "circumferential", "radial", "axial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0125] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "dispose," "install," "connect," and "fit" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0126] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A radio frequency device, characterized in that: Used to synthesize the first signal and the second signal into a third signal, or to divide the third signal into the first signal and the second signal; the radio frequency device includes a first 90° bridge, a second 90° bridge, a first filter and a second filter, wherein: The first port of the first 90° bridge and the second port of the first 90° bridge are mutually isolated terminals, the first port of the first 90° bridge and the fourth port of the first 90° bridge are mutually direct terminals, and the fourth port of the first 90° bridge is connected to a signal absorbing load; The first port of the second 90° bridge and the second port of the second 90° bridge are isolated ends from each other; The first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter; The operating frequency bands of the first 90° bridge and the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency bands of the first filter and the second filter cover the frequency of the first signal, but do not cover the frequency of the second signal.

2. The radio frequency device according to claim 1, characterized in that: The second port of the second 90° bridge and the third port of the second 90° bridge are through ports to each other; The third port of the first 90° bridge is used to receive the first signal, and the third port of the second 90° bridge is used to receive the second signal. When the first signal is input to the third port of the first 90° bridge and the second signal is input to the third port of the second 90° bridge, the fourth port of the second 90° bridge can output the third signal synthesized by the first signal and the second signal, or The fourth port of the second 90° bridge is used to receive the third signal. When the fourth port of the second 90° bridge inputs the third signal, the third port of the first 90° bridge can output the first signal, and the third port of the second 90° bridge can output the second signal.

3. A radio frequency device, characterized in that: Used to filter a third signal, the third signal includes a first signal and a second signal; the radio frequency device includes a first 90° bridge, a second 90° bridge, a first filter and a second filter, wherein: The first port of the first 90° bridge and the second port of the first 90° bridge are mutually isolated terminals, the first port of the first 90° bridge and the fourth port of the first 90° bridge are mutually direct terminals, the first port of the second 90° bridge and the second port of the second 90° bridge are mutually isolated terminals, the second port of the second 90° bridge and the third port of the second 90° bridge are mutually direct terminals, and the fourth port of the first 90° bridge and the third port of the second 90° bridge are respectively connected to signal absorbing loads; The first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter; The operating frequency bands of the first 90° bridge and the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency bands of the first filter and the second filter cover the frequency of the first signal, but do not cover the frequency of the second signal.

4. The radio frequency device according to claim 3, characterized in that: One of the third port of the first 90° bridge and the fourth port of the second 90° bridge is used to receive the third signal, and the other port is used to output the first signal.

5. A radio frequency device, characterized in that: Used to filter a third signal, the third signal being composed of a first signal and a second signal; the radio frequency device comprising a first 90° bridge, a second 90° bridge, a first filter and a second filter, wherein: The first port of the first 90° bridge and the second port of the first 90° bridge are mutually isolated ends, the first port of the first 90° bridge and the fourth port of the first 90° bridge are mutually direct ends, and the third port of the first 90° bridge and the fourth port of the first 90° bridge are respectively connected to signal absorbing loads; The first port of the second 90° bridge and the second port of the second 90° bridge are isolated ends from each other; The first port of the first 90° bridge is connected to the first port of the second 90° bridge through the first filter, and the second port of the first 90° bridge is connected to the second port of the second 90° bridge through the second filter; The operating frequency bands of the first 90° bridge and the second 90° bridge both cover the frequency of the first signal and the frequency of the second signal; the operating frequency bands of the first filter and the second filter cover the frequency of the first signal, but do not cover the frequency of the second signal.

6. The radio frequency device according to claim 5, characterized in that: One of the third port of the second 90° bridge and the fourth port of the second 90° bridge is used to receive the third signal, and the other port is used to output the second signal.

7. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: A first bridge arm between the first port and the second port in the first 90° bridge is grounded; and / or, The second bridge arm between the third port and the fourth port in the first 90° bridge is grounded.

8. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: In the first 90° bridge, the midpoint of the third bridge arm between the first port and the fourth port and the midpoint of the fourth bridge arm between the second port and the third port are connected through a fifth bridge arm, and the lengths of the third bridge arm and the fourth bridge arm are both λ / 2, wherein λ is the wavelength of the signal at the center frequency of the operating frequency band of the first 90° bridge.

9. The radio frequency device according to claim 8, characterized in that: The third bridge arm and the fourth bridge arm of the first 90° bridge are respectively in a zigzag shape.

10. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: The first bridge arm between the first port and the second port in the second 90° bridge is grounded; and / or the second bridge arm between the third port and the fourth port in the second 90° bridge is grounded.

11. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: In the second 90° bridge, the midpoint of the third bridge arm between the first port and the fourth port and the midpoint of the fourth bridge arm between the second port and the third port are connected through a fifth bridge arm, and the length between the third bridge arm and the fourth bridge arm is λ / 2, where λ is the wavelength of the signal at the center frequency of the operating frequency band of the second 90° bridge; The third bridge arm and the fourth bridge arm of the second 90° bridge are respectively in a zigzag shape.

12. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: The RF device also includes a substrate, the first 90° bridge and the second 90° bridge are respectively arranged on the same side of the substrate, a metal layer is provided on the side of the substrate facing away from the first 90° bridge and the second 90° bridge, and the first filter and the second filter are arranged on the metal layer.

13. The radio frequency device according to claim 12, characterized in that: The first filter and the second filter are dielectric substrate filters or cavity filters.

14. The radio frequency device according to claim 12, characterized in that: The first filter and the second filter are cavity filters, and the substrate is a tuning cover plate of the cavity filters.

15. The radio frequency device according to claim 14, characterized in that: A plurality of resonators are arranged in the cavity of the cavity filter, the substrate is covered on the opening of the cavity, a plurality of tuning sleeves are arranged on the metal layer, a tuning screw is fixed in each of the tuning sleeves, and the plurality of tuning screws correspond to the plurality of resonators one by one.

16. The radio frequency device according to any one of claims 1, 3 or 5, characterized in that: The first port and the second port of the first 90° bridge are connected to the first filter and the second filter respectively through metallized vias or filter port connecting pins; the first port and the second port of the second 90° bridge are connected to the first filter and the second filter respectively through metallized vias or filter port connecting pins.

17. The radio frequency device according to claim 12, characterized in that: The substrate includes any one of a glass substrate, a plastic substrate, a ceramic substrate or a printed circuit board.

18. An antenna system, characterized in that: The invention comprises a radiation unit and the radio frequency device according to any one of claims 1 to 17, wherein the radiation unit is connected to the radio frequency device.

19. A base station, characterized in that: The invention comprises an antenna mounting bracket and the antenna system as claimed in claim 18, wherein the antenna system is mounted on the antenna mounting bracket.

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