Radio frequency device, antenna system and base station

Abstract

The application relates to the radio frequency technical field 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, and 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. The first port and the second port of the first 90-degree bridge are isolation ports, and the fourth port is a through port, and the fourth port is connected with a signal absorption load. The first port and the second port of the second 90-degree bridge are isolation ports. In the first 90-degree bridge and the second 90-degree bridge, the two first ports are connected through the first filter, and the two second ports are connected through the second filter. The working frequency bands of the first 90-degree bridge and the second 90-degree bridge cover the frequencies of the first signal and the second signal. The working frequency bands of the first filter and the second filter cover the frequency of the first signal and do not cover the frequency of the second signal. The radio frequency device is a non-reflector device, and the resonance phenomenon can be weakened.

Description

TECHNICAL FIELD

[0001] 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

[0002] With the development of communication technology, the importance of base station antennas in wireless communication systems is increasing. In order to meet the working requirements in different application scenarios, the integration of base station antennas is also increasing. For example, in the current independent electrically adjustable frequency division antenna system, cascaded radiation units, radiation unit frequency division combiners, main feed combiners, phase shifters, power dividers and filters are usually integrated.

[0003] However, the existing radiation units, combiners, phase shifters, power dividers and filters are all reflective devices. In a specific frequency band, these devices are in a standing wave matching state, that is, the output impedance of the signal source and the input impedance of the load are matched, so that the signal can be completely transmitted to the load through the transmission line; while in other frequency bands, these components are in a standing wave mismatch state, that is, the output impedance of the signal source and the input impedance of the load are not matched, and part of the signal will be reflected back. These reflective devices will produce resonance phenomenon in some frequency bands after cascading, thereby causing problems such as signal attenuation, distortion or interference, and further affecting the working performance of the antenna system. SUMMARY

[0004] To solve the above problems, the present application provides a radio frequency device, an antenna system and a base station. The radio frequency device is a non-reflective device, which can eliminate unnecessary signals during transmission, thereby achieving a non-reflective effect, effectively weakening the above resonance phenomenon, and further improving the working performance.

[0005] 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 splitting the third signal into the first signal and the second signal; the radio frequency device comprises a first 90° bridge, a second 90° bridge, a first filter and a second filter, wherein a first port of the first 90° bridge and a second port of the first 90° bridge are isolated ports, the first port of the first 90° bridge and a fourth port of the first 90° bridge are through ports, and the fourth port of the first 90° bridge is connected to a signal absorbing load; a first port of the second 90° bridge and a second port of the second 90° bridge are isolated ports; 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; a frequency band of the first 90° bridge and a frequency band of the second 90° bridge cover a frequency of the first signal and a frequency of the second signal; and a frequency band of the first filter and a frequency band of the second filter cover the frequency of the first signal but do not cover the frequency of the second signal.

[0006] The radio frequency device described above, 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 functions of combining and splitting, effectively avoid unnecessary signals from being reflected out of the input port, achieve the effect of no reflection, and further make the radio frequency device have good working performance.

[0007] In a possible implementation of the first aspect, the second port of the second 90° bridge and the third port of the second 90° bridge are through ports; the third port of the first 90° bridge is configured to receive the first signal, and the third port of the second 90° bridge is configured to receive the second signal; when the third port of the first 90° bridge inputs the first signal and the third port of the second 90° bridge inputs the second signal, the fourth port of the second 90° bridge can output the third signal synthesized by the first signal and the second signal. Alternatively, the fourth port of the second 90° bridge is configured 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.

[0008] In a second aspect, the present application provides a radio frequency device for filtering a third signal, the third signal comprising 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 a first port of the first 90° bridge and a second port of the first 90° bridge are isolated ports, the first port of the first 90° bridge and a fourth port of the first 90° bridge are through ports, a first port of the second 90° bridge and a second port of the second 90° bridge are isolated ports, the second port of the second 90° bridge and a third port of the second 90° bridge are through ports, 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 working frequency range of the first 90° bridge and the working frequency range of the second 90° bridge cover the frequency of the first signal and the frequency of the second signal; the working frequency range of the first filter and the working frequency range of the second filter cover the frequency of the first signal and do not cover the frequency of the second signal.

[0009] The radio frequency device described above, 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 avoid unnecessary signals from being reflected out of the input port, so as to achieve the effect of no reflection, and further make the radio frequency device have good working performance.

[0010] 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 is used to output the first signal.

[0011] In a third aspect, the present application provides a radio frequency device for filtering 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, a first port of the first 90° bridge and a second port of the first 90° bridge are isolated from each other, the first port of the first 90° bridge and a fourth port of the first 90° bridge are connected in a straight-through manner, and a third port of the first 90° bridge and the fourth port of the first 90° bridge are respectively connected to a signal absorbing load. A first port of the second 90° bridge and a second port of the second 90° bridge are isolated 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 working frequency band of the first 90° bridge and the working frequency band of the second 90° bridge both 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 and do not cover the frequency of the second signal.

[0012] The radio frequency device described above, 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 achieve the filtering function, but also effectively avoid unnecessary signals from being reflected out of the input port, thereby achieving the effect of no reflection, and further enabling the radio frequency device to have good working performance.

[0013] 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 is used to output the second signal.

[0014] In a possible implementation of the first aspect, the second aspect or the third aspect, a first bridge arm between the first port and the second port in the first 90° bridge is grounded; and / or, a second bridge arm between the third port and the fourth port in the first 90° bridge is grounded. Thus, the working performance of the first 90° bridge is further improved.

[0015] In a possible implementation of the first aspect, the second aspect or the third aspect, in the first 90° bridge, the midpoint of a third bridge arm between the first port and the fourth port and the midpoint of a 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 working frequency band of the first 90° bridge.

[0016] The first 90° bridge described above, by adding the fifth bridge arm, can effectively increase the working bandwidth and improve the working performance.

[0017] 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-degree bridge are meander-shaped.

[0018] According to the embodiments of the present application, the third bridge arm and the fourth bridge arm of the first 90-degree bridge are meander-shaped, which can effectively reduce the size occupied by the third bridge arm and the fourth bridge arm, and further reduce the size of the first 90-degree bridge, and is conducive to the miniaturization of the first 90-degree bridge.

[0019] In a possible implementation of the first aspect, the second aspect or the third aspect, the first bridge arm between the first port and the second port in the second 90-degree bridge is grounded; and / or, the second bridge arm between the third port and the fourth port in the second 90-degree bridge is grounded. Thus, the working performance of the second 90-degree bridge is further improved.

[0020] In a possible implementation of the first aspect, the second aspect or the third aspect, in the second 90-degree 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 by a fifth bridge arm, the length between the third bridge arm and the fourth bridge arm is λ / 2, where λ is the wavelength of a signal at the center frequency of the working frequency band of the second 90-degree bridge; the third bridge arm and the fourth bridge arm of the second 90-degree bridge are meander-shaped.

[0021] The above-mentioned second 90-degree bridge can effectively increase the working bandwidth and improve the working performance by adding the fifth bridge arm. In addition, the third bridge arm and the fourth bridge arm of the second 90-degree bridge are meander-shaped, which can effectively reduce the size occupied by the third bridge arm and the fourth bridge arm, and further reduce the size of the second 90-degree bridge, and is conducive to the miniaturization of the second 90-degree bridge.

[0022] In a possible implementation of the first aspect, the second aspect or the third aspect, the radio frequency device further comprises a substrate, the first 90-degree bridge and the second 90-degree bridge are arranged on the same side of the substrate, a metal layer is arranged on the side of the substrate away from the first 90-degree bridge and the second 90-degree bridge, and the first filter and the second filter are arranged on the metal layer.

[0023] The above-mentioned substrate can play a supporting role. In addition, the metal layer can provide reliable grounding and conduction functions.

[0024] 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.

[0025] 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 filters.

[0026] When the substrate is used as the tuning cover of the first filter and the second filter, the first filter and the second filter do not need to be additionally provided with a tuning cover, thereby reducing the number of components and facilitating low cost and miniaturization.

[0027] In a possible implementation of the first aspect, the second aspect or the third aspect, the cavity filter is provided with a plurality of resonators in the cavity, the substrate is arranged on the opening of the cavity, the metal layer is provided with a plurality of tuning sleeves, and each tuning sleeve is fixed with a tuning screw.

[0028] Based on this, the frequency of the resonator can be adjusted by adjusting the depth of each tuning screw into the corresponding resonator, thereby meeting the working requirements in different application scenarios.

[0029] 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° electric bridge are connected with the first filter and the second filter respectively through a metalized via or a filter port connecting pin; and the first port and the second port of the second 90° electric bridge are connected with the first filter and the second filter respectively through a metalized via or a filter port connecting pin.

[0030] 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.

[0031] In a fourth aspect, the present application provides an antenna system, including a radiating unit and any one of the radio frequency device in the first aspect, the possible implementation of the first aspect, the second aspect, the possible implementation of the second aspect, the third aspect and the possible implementation of the third aspect, and the radio frequency device is connected with the radiating unit.

[0032] In a fifth aspect, the present application provides a base station, including an antenna mounting rack and the antenna system in the fourth aspect, and the antenna system is mounted on the antenna mounting rack. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 An exemplary structure diagram of a 90° electric bridge is shown;

[0034] Figure 2 A structure schematic diagram of a base station in an embodiment of the present application is shown;

[0035] Figure 3 A structure schematic block diagram of an antenna system in an embodiment of the present application is shown;

[0036] Figures 4A-4C A schematic diagram of several feed networks in an antenna system in an embodiment of the present application is shown;

[0037] Figure 5 A structure schematic diagram of a radio frequency device in some embodiments of the present application is shown;

[0038] Figure 6A and Figure 6B A schematic diagram of transmission of signal S1 and signal S2 in a radio frequency device in some embodiments of the present application is shown;

[0039] Figure 7A A schematic diagram of transmission of signal S2 from the third port of the first 90° bridge in some embodiments is shown;

[0040] Figure 7B A schematic diagram of transmission of signal S1 from the third port of the second 90° bridge in some embodiments is shown;

[0041] Figures 8A-8C A structure schematic diagram of a radio frequency device in some embodiments of the present application is shown Figure One wherein, Figure 8A is a side view of the radio frequency device, Figure 8B is a top view of the radio frequency device, Figure 8C is a bottom view of the radio frequency device;

[0042] Figures 9A-9C A structure schematic diagram of a radio frequency device in some embodiments of the present application is shown Figure Two wherein, Figure 9A is a side view of the radio frequency device, Figure 9B is a top view of the radio frequency device Figure One , Figure 9C is a top view of the radio frequency device Figure Two wherein the first 90° bridge, the second 90° bridge and the substrate are not shown;

[0043] Figure 10 An exemplary structure diagram of the substrate as a tuning cover in some embodiments of the present application is shown;

[0044] Figure 11A An exemplary connection mode one of the first port of the first 90° bridge and the first connection port of the first filter in some embodiments of the present application is shown;

[0045] Figure 11B An exemplary connection mode two of the first port of the first 90° bridge and the first connection port of the first filter in some embodiments of the present application is shown;

[0046] Figure 12 A schematic diagram of filtering of a radio frequency device in some embodiments of the present application is shown;

[0047] Figure 13 A schematic diagram of filtering of a radio frequency device in some other embodiments of the present application is shown. DETAILED DESCRIPTION

[0048] For the purpose of making the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0049] It should be understood that the "multiple" mentioned in the present application refers to two or more. In the description of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in the present application only represents the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. In addition, in order to clearly describe the technical scheme of the present application, the same items or similar items with basically the same function and role are distinguished by using "first", "second", etc. The skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. also do not limit the difference.

[0050] In order to facilitate the understanding of the technical scheme of the present application, some concepts or terms involved in the present application will be explained and described first.

[0051] 90° bridge: The 90° bridge can include four bridge arms and four ports. The four bridge arms are connected end to end to form a quadrilateral loop. One of the ports is an input port, and the remaining three ports are isolation ports, through ports and coupling ports, respectively. When a signal is input from the input port, it can be divided into two equal amplitude signals, which are output from the coupling port and the through port, respectively. In addition, the phase of the signal output from the coupling port lags 90° behind the phase of the signal output from the through port.

[0052] Specifically, Figure 1 An exemplary structural diagram of the 90° bridge 2 is shown. As Figure 1 shown, the 90° bridge 2 includes a first bridge arm 21, a second bridge arm 22, a third bridge arm 23 and a fourth bridge arm 24, and a first port a, a second port b, a third port c and a fourth port d.

[0053] Among them, the first bridge arm 21, the fourth bridge arm 24, the second bridge arm 22 and the third bridge arm 23 are connected end to end to form a structure similar to the "mouth" character. The first port a is located at the connection A between the first bridge arm 21 and the third bridge arm 23. The second port b is located at the connection B between the first bridge arm 21 and the fourth bridge arm 24. The port c is located at the connection C between the second bridge arm 22 and the fourth bridge arm 24. The port d is located at the connection D between the second bridge arm 22 and the third bridge arm 23.

[0054] The path length from junction A to junction B (i.e., the length of the first bridge arm 21), the path length from junction B to junction C, the path length from junction C to junction D (i.e., the length of the second bridge arm 22), and the path length from junction D to junction A are each λ / 4, where λ is the wavelength of a signal at the center frequency of the operating frequency band of the 90° bridge 2. The characteristic impedance of the first bridge arm 21 and the second bridge arm 22 are each Z0. The characteristic impedance of the third bridge arm 23 and the fourth bridge arm 24 are each The characteristic impedance of the four ports a-d is each Z0.

[0055] The 90° bridge 2 is capable of splitting an input signal into two outputs of equal amplitude and with a 90° phase difference. For example, when a signal S0 is input from the third port c, it is split 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 signals S01 and S02 are of equal amplitude, and the phase of the signal S01 lags the phase of the signal S02 by 90°. For example, the phase of the signal S0 can be 0°, the phase of the signal S01 can be -180°, and the phase of the signal S02 can be -90°. The fourth port d has no signal output. At this time, the third port c is referred to as the input end, the first port a is referred to as the coupled end, the second port b is referred to as the through end, and the fourth port d is referred to as the isolated end.

[0056] The 90° bridge 2 can also combine two input signals with equal amplitude and 90° phase difference into one output. For example, when the first port a receives signal S01 and the second port b receives signal S02, signal S01 and signal S02 can cancel each other at the third port c and combine at the fourth port d. Specifically, when the first port a receives signal S01 as input, the second port b is an isolated port, the third port c is a coupled port, and the fourth port d is a through port. According to the splitting characteristics of the 90° bridge 2, the third port c outputs signal S011 and the fourth port d outputs signal S012. Signal S011 and signal S012 have equal amplitude, and the phase of signal S011 (e.g., -360°) lags 90° behind the phase of signal S012 (e.g., -270°). When the second port b receives signal S02 as input, the first port a is an isolated port, the third port c is a through port, and the fourth port d is a coupled port. According to the splitting characteristics of the 90° bridge 2, the third port c outputs signal S021 and the fourth port d outputs signal S022. Signal S021 and signal S022 have equal amplitude, and the phase of signal S022 (e.g., -270°) lags 90° behind the phase of signal S022 (e.g., -180°). In summary, at the third port c, signal S011 and signal S021 are equal-amplitude and opposite-phase signals, and they cancel each other out, resulting in no signal output. At the fourth port d, signal S012 and signal S022 are equal-amplitude and same-direction signals, and they combine and output from the fourth port d.

[0057] Conversely, when the first port a receives signal S02 and the second port b receives signal S01, signal S01 and signal S02 can combine at the third port c and cancel each other at the fourth port d. The specific transmission process of signal S02 at the first port a and signal S01 at the second port b can refer to the specific transmission process of signal S01 at the first port a and signal S02 at the second port b described above, which will not be repeated here.

[0058] It can be understood that the 90° bridge 2 described above is a reciprocal structure, and any one of the ports a-d can be used as an input port, and the corresponding isolated port and output port will change positions accordingly when the input port changes.

[0059] For example, the first port a and the second port b are isolated from each other, that is, when any one of the first port a and the second port b is an input port, the other port is an isolated port. The second port b and the third port c are straight-through ports, that is, when any one of the second port b and the third port c is an input port, the other port is a straight-through port. The third port c and the fourth port d are also isolated from each other, and the fourth port d and the first port a are also straight-through ports.

[0060] It can be understood that the above-mentioned 90° electrical bridge 2 can also be implemented in other forms other than the structure shown in the figure, as long as the function of the 90° electrical bridge 2 can be realized, and the present application is not limited. Figure 1 It can be understood that the above-mentioned 90° electrical bridge 2 can also be implemented in other forms other than the structure shown in the figure, as long as the function of the 90° electrical bridge 2 can be realized, and the present application is not limited.

[0061] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0062] The present application provides a radio frequency device, an antenna system and a base station. The radio frequency device provided by the present application is a non-reflection type device, which can effectively weaken the resonance phenomenon caused by cascading of each frequency selection device, and has good working performance. The antenna system can include, but is not limited to, any one or more of a passive antenna or a multiple-input multiple-out-put (MIMO) system antenna.

[0063] Figure 2 The structure schematic diagram of the base station 1 in the embodiment of the present application is shown. Referring to Figure 2 , the base station 1 includes an antenna system 01, an antenna adjusting support 02, a guyed tower 03 (as an “antenna mounting rack”), an outdoor jumper 04, a feeder 05, a joint sealing member 06 and a grounding device 07.

[0064] The antenna system 01 is installed on the guyed tower 03 through the antenna adjusting support 02, so as to facilitate the reception or transmission of signals of the antenna system 01.

[0065] One end of the feeder 05 is connected with the antenna system 01 through the outdoor jumper 04, and the other end of the feeder 05 is connected with a transmitting device (not shown), so as to transmit signals between the transmitting device and the antenna system 01.

[0066] The joint sealing member 06 is arranged at the connection between the antenna system 01 and the outdoor jumper 04 and the connection between the outdoor jumper 04 and the feeder 05, so as to play an insulation sealing role. The joint sealing member 06 can be an insulation sealing tape or a polyvinyl chloride (PVC) insulation glue.

[0067] The grounding device 07 is arranged on the feeder 05. The grounding device 07 can serve as electrical grounding, lightning protection, overvoltage protection, and maintenance of equipment performance, and helps to ensure the stability and safety of the operation of the base station 1.

[0068] Figure 3 A structural schematic block diagram of the antenna system 01 in the embodiment of the present application is shown. As shown, the antenna system 01 includes a feeding network 10, a radiating unit 11, a reflecting plate 12, an antenna junction 13, and a radome 14. Figure 3

[0069] The feeding network 10, the radiating unit 11, and the reflecting plate 12 are all located within the radome 14. The radome 14 has good electromagnetic wave penetration characteristics in terms of electrical performance, and can withstand the influence of external harsh environments in terms of mechanical performance, thereby protecting the antenna system 01 from external environmental influences.

[0070] The radiating unit 11 is arranged on one side surface of the reflecting plate 12 and is connected to the antenna junction 13 through the feeding network 10. The radiating unit 11 can also be referred to as an antenna unit, an antenna element, an element, etc. The radiating unit 11 is a unit that constitutes the basic structure of an antenna array and can effectively transmit or receive antenna signals. In the antenna system 01, the frequencies of different radiating units 11 can be the same or different. The reflecting plate 12 can also be referred to as a bottom plate, an antenna panel, or a reflecting panel, etc. Exemplarily, the reflecting plate 12 can be of metal material. When the antenna system 01 receives signals, the reflecting plate 12 can reflect and concentrate the antenna signals at a receiving point, thereby realizing directional reception.

[0071] The feeding network 10 is usually cascaded by a plurality of radio frequency devices. The feeding network 10 can feed signals to the radiating unit 11 according to certain amplitudes and phases, or transmit received signals to a baseband processing unit (not shown) connected to the antenna junction 13 according to certain amplitudes and phases. The feeding network 10 can include a phase shifter 101, a transmission component 102, and a calibration network 103. 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 realize different radiation beam pointing through the transmission component 101. Alternatively, the phase shifter 101 can be connected to the calibration network 102 to obtain the required calibration signal of the system.

[0072] ​In addition, the feeding network 10 can further include a combiner 104 or a filter 105, etc. for extending the performance of the radio frequency device. The combiner 104 can combine multiple input signals of different frequencies into one output signal, or the combiner 104 can also be used reversely to divide one input signal into multiple output signals according to different frequencies. The filter 105 can be used to filter out interference signals and improve the effect of signal transmission.

[0073] The feeding network 10 described above can have different cascaded architectures to meet the feeding requirements in different application scenarios. For example, Figures 4A-4C The schematic diagrams of several feeding networks 10 in the antenna system 01 in the embodiments of the present application are shown.

[0074] 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, i.e. one port corresponds to three radiating elements. Referring to Figure 4A The feeding network 10 can include a phase shifter 101, a filter 105, and a power divider 106. 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 antenna joint 13 described above). In this way, the feeding network 10 can combine three signals emitted by the three radiating elements 11 into one output, or divide the signals of a specific frequency into three paths to feed the three radiating elements 11 respectively.

[0075] 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, i.e. two ports correspond to three radiating elements. Referring to Figure 4B The feeding network 10 can include a phase shifter 101, a combiner 104, and a power divider 106. 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. The port port1 and the port port2 of the combiner 104 can be used to connect other devices (for example, the antenna joint 13 described above). In this way, the feeding network 10 can combine three signals emitted by the three radiating elements 11 into two outputs, or divide two signals into three paths to feed the three radiating elements 11 respectively.

[0076] In some other embodiments of the present application, the feeding network 10 in the antenna system 01 can also have a more complex cascaded architecture to realize the independent electrically tunable frequency division function of the antenna system 01. Referring to Figure 4C The feeding network 10 can include two phase shifters 101, one main feeding combiner 104a, and five unit combiners 104b. It should be noted that, Figure 4COnly two unit combiners 104b are shown in FIG. 1, and the other three unit combiners 104b are replaced by ellipses. Five radiating elements 11 correspond to five unit combiners 104b one-to-one. Each radiating element 11 is connected to the port portl of the corresponding unit combiner 104b. The port port2 and the port port3 of each unit combiner 104b are connected to one end of two phase shifters 101 respectively. The other end of the two phase shifters 101 is connected to the port port2 and the port port3 of the main feed combiner 104a respectively. The port portl of the main feed combiner 104a can be connected to other devices (for example, the antenna junction 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 (for example, Bandl and Band2), then perform corresponding processing on the signals of each frequency band, and then combine the signals into one signal for output, thereby realizing the independent electrically adjustable frequency division function of the antenna system 01.

[0077] In some technical solutions, the radio frequency devices (for example, phase shifters, combiners, filters, and power dividers) in the feed network are all reflection-type devices with certain frequency selection characteristics. After these reflection-type devices are cascaded to form the feed network 10 of the antenna system 01, resonance phenomenon will occur in certain frequency bands, thereby causing problems such as signal attenuation, distortion, or interference, and thereby affecting the working performance of the antenna system 01. In order to weaken the resonance phenomenon, a radio frequency device (for example, a reflectionless combiner, a reflectionless filter, a reflectionless power divider, or a reflectionless phase shifter) needs to be redesigned to achieve a reflectionless effect.

[0078] To solve the above problems, the present application provides a radio frequency device, which is a reflectionless device, can eliminate unnecessary signals in the transmission process, thereby achieving a reflectionless effect, effectively weakening the above resonance phenomenon, and further improving the working performance. The following will be described in detail in conjunction with the accompanying drawings.

[0079] Figure 5 The structure schematic block diagram of the radio frequency device 100 in the embodiment of the present application is shown. As shown in FIG. 1, 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. Figure 5

[0080] ​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, and the first port a1 and the fourth port d1 are through ports.

[0081] Exemplarily, the first 90° bridge 110 includes a first arm 111, a second arm 112, a third arm 113, and a fourth arm 114. Among them, the first arm 111, the fourth arm 114, the second arm 112, and the third 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 arm 111 and the third arm 113. The second port b1 can be located at the connection between the first arm 111 and the fourth arm 114. The third port c1 can be located at the connection between the second arm 112 and the fourth arm 114. The fourth port d1 can be located at the connection between the second arm 112 and the third arm 113.

[0082] 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.

[0083] Exemplarily, the second 90° bridge 120 includes a first arm 121, a second arm 122, a third arm 123, and a fourth arm 124. Among them, the first arm 121, the fourth arm 124, the second arm 122, and the third 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 arm 121 and the third arm 123. The second port b2 can be located at the connection between the first arm 121 and the fourth arm 124. The third port c2 can be located at the connection between the second arm 122 and the fourth arm 124. The fourth port d2 can be located at the connection between the second arm 122 and the third arm 123.

[0084] The first port a1 of the first 90° bridge 110 is connected to the first port a2 of the second 90° bridge 120 through a 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 a second filter 140. The fourth port d1 of the first 90° bridge 110 is connected to a signal absorption load 150. The above radio frequency device 100 can achieve different signal transmission functions (for example, combining function or splitting function), and at the same time achieve a non-reflection effect. For the convenience of understanding the signal transmission function and non-reflection effect of the above radio frequency device 100, the following describes in combination with the signal transmission process in the radio frequency device 100.

[0085] Exemplarily, Figure 6A and Figure 6BA schematic diagram showing the transmission of the signal S1 and the signal S2 in the radio frequency device 100 in the embodiments of the present application is shown. In combination with Figure 6A and Figure 6B The working frequency range of the first 90° bridge 110 and the working frequency range of the second 90° bridge 120 both cover the frequency of the signal S1 (as the first signal) and the frequency of the signal S2 (as the second signal). The working frequency range of the first filter 130 and the working frequency range 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. That is, the first signal S1 can pass through the first filter 130 and the second filter 140. But the second signal S2 cannot pass through the first filter 130 and the second filter 140.

[0086] When the signal S1 is input from the third port c1 of the first 90° bridge 110 and the signal S2 is input from the third port c2 of the second 90° bridge 120, a signal (as a third signal) synthesized by the signal S1 and the signal S2 can be output from the fourth port d2 of the second 90° bridge 120, thereby realizing the combining function of the radio frequency device 100. Conversely, when the signal S1 and the signal S2 are simultaneously input from the fourth port d2 of the second 90° bridge 120, the signal S1 can be output from the third port c1 of the first 90° bridge 110 and the signal S2 can be output from the third port c2 of the second 90° bridge 120, thereby realizing the splitting function of the radio frequency device 100. Based on this, the radio frequency device 100 can be used as Figure 4B the combiner 104 in the Figure 4C main feeder combiner 104a or the unit combiner 104b in the The combiner (for example, the combiner 104, the combiner 104a and the combiner 104b) is a non-reflection combiner, which can effectively weaken the resonance phenomenon, thereby improving the working performance of the feeder network 10.

[0087] It can be understood that the splitting transmission process of the signal S1 and the signal S2 and the above-mentioned combining transmission process of the signal S1 and the signal S2 are reciprocal processes. For ease of description, the combining transmission process of the signal S1 and the signal S2 is taken as an example for introduction below.

[0088] In particular, according to the characteristics of the aforementioned 90° bridge 2, when a signal S1 is input from the third port cl of the first 90° bridge 110, the signal S1 will be divided into a signal S11 and a signal S12. The signal S11 is output from the first port al, and the signal S12 is output from the second port bl. The amplitudes of the signal S11 and the signal S12 are equal, and the phase of the signal S11 lags 90° behind the phase of the signal S12. The signal S11 can enter the first port a2 of the second 90° bridge 120 through the first filter 130. The signal S12 can enter the second port b2 of the second 90° bridge 120 through the second filter 140. The signal S11 and the signal S12 can be cancelled at the third port c2 of the second 90° bridge 120, and combined as the signal S1 at the fourth port d2 of the second 90° bridge.

[0089] According to the characteristics of the aforementioned 90° bridge, when a signal S2 is input from the third port c2 of the second 90° bridge 120, the signal S2 will be divided into a signal S21 and a signal S22. The signal S21 is output from the first port a2, and the signal S22 is output from the second port b2. The amplitudes of the signal S21 and the signal S22 are equal, and the phase of the signal S21 lags 90° behind the phase of the signal S22. Since the frequency band of the signal S2 is outside the passband of the first filter 130 and the second filter 140. Therefore, the signal S21 will be reflected back to the first port a2 by the first filter 130, and the signal S22 will be reflected back to the second port b2 by the second filter 140. The reflected signals S21 and S22 can also be cancelled at the third port c2 of the second 90° bridge 120, and combined as the signal S2 at the fourth port d2 of the second 90° bridge 120. Thus, the signal S1 and the signal S2 can be combined at the fourth port d2 of the second 90° bridge 120, thereby realizing the combining function of the radio frequency device 100.

[0090] When the third port cl of the first 90° bridge 110 or the third port c2 of the second 90° bridge 120 inputs a signal that does not correspond, these signals can be eliminated during transmission, thereby achieving the effect of no reflection.

[0091] For example, Figure 7A A transmission schematic diagram is shown in some embodiments in which the signal S2 is input from the third port cl of the first 90° bridge 110. Referring to Figure 7AIn the normal operation of the radio frequency device 100, the third port cl of the first 90° bridge 110 corresponds to signal S1. When signal S2 is input from the third port cl of the first 90° bridge 110, according to the characteristics of the 90° bridge, the first port al can output signal S21, and the second port bl can output signal S22. The amplitudes of the signals S21 and S22 are equal, and the phase of the signal S21 lags 90° behind the phase of the signal S22. Since the frequency band of the signal S2 is outside the passband of the first filter 130 and the second filter 140, the signal S21 is reflected back to the first port al by the first filter 130, and the signal S22 is reflected to the second port bl by the second filter 140. The reflected signals S21 and S22 can be cancelled at the third port cl and combined into signal S2 at the fourth port dl, which is absorbed by the signal absorbing load 150 connected to the fourth port dl. In this way, the signal S2 input from the first 90° bridge 110 can be eliminated in the transmission process without being reflected out of the first 90° bridge 110, thereby achieving the effect of no reflection.

[0092] For another example, Figure 7B A transmission diagram is shown in some embodiments for the signal S1 input from the third port c2 of the second 90° bridge 120. Referring to Figure 7B In the normal operation of the radio frequency device 100, the third port c2 of the second 90° bridge 120 corresponds to signal S2. When signal S1 is input from the third port c2 of the second 90° bridge 120, according to the characteristics of the 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 90° behind the phase of the signal S12. The signal S11 can enter the first port al of the first 90° bridge 110 through the first filter 130. The signal S12 can enter the second port bl of the first 90° bridge 110 through the second filter 140. The signals S11 and S12 can also be cancelled at the third port cl of the first 90° bridge 110 and combined into signal S1 at the fourth port dl of the first 90° bridge 110, which is absorbed by the signal absorbing load 150 connected to the fourth port dl. In this way, the signal S1 input from the second 90° bridge 120 can be eliminated in the transmission process, thereby achieving the effect of no reflection.

[0093] In summary, the radio frequency device 100 can effectively avoid unnecessary signals from being reflected out of the input port, and thus achieve the non-reflection effect, while realizing the combining function and the splitting function, so that the radio frequency device 100 can have good working performance.

[0094] The specific structural forms of the components in the radio frequency device 100 will be further described below in combination with the accompanying drawings.

[0095] Figures 8A-8C The structure of the radio frequency device 100 in the embodiment of the present application is shown Figure One wherein, Figure 8A is a side view of the radio frequency device 100, Figure 8B is a top view of the radio frequency device 100, Figure 8C is a bottom view of the radio frequency device 100.

[0096] Figures 9A-9C The structure of the radio frequency device 100 in the embodiment of the present application is shown Figure Two wherein, Figure 9A is a side view of the radio frequency device 100, Figure 9B is a top view of the radio frequency device 100, Figure One , Figure 9C is a top view of the radio frequency device 100, Figure Two wherein the first 90° bridge 110, the second 90° bridge 120 and the substrate 170 are not shown.

[0097] Reference Figure 8B and Figure 9B In some embodiments of the present application, the first bridge arm 111 of the first 90° bridge 110 and / or the second bridge arm 112 of the first 90° bridge 110 can be grounded to further improve the working performance of the first 90° bridge 110. For example, the first bridge arm 111 of the first 90° bridge 110 and the second bridge arm 112 of the first 90° bridge 110 can be respectively grounded through the grounding hole 160.

[0098] In some embodiments of the present application, the first 90° bridge 110 can further include a fifth bridge arm 115 to further increase the working bandwidth of the first 90° bridge 110. Specifically, as Figure 8B and Figure 9BAs shown, the fifth bridge arm 115 is connected between the midpoint of the third bridge arm 113 and the midpoint of the fourth bridge arm 114, so that the first 90° electrical bridge 110 is in the shape of a "sun" as a whole. 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 of the center frequency of the working frequency band of the first 90° electrical 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 is 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.

[0099] In some embodiments of the present application, the third bridge arm 113 and the fourth bridge arm 114 of the first 90° electrical bridge 110 are both in a meandering shape, so as to reduce the size of the third bridge arm 113 and the fourth bridge arm 114 in the X direction, and further reduce the size of the first 90° electrical bridge 110, which is conducive to the miniaturization of the radio frequency device 100.

[0100] In some embodiments of the present application, the first bridge arm 121 of the second 90° electrical bridge 120 and / or the second bridge arm 122 of the second 90° electrical bridge 120 can be grounded, so as to further improve the working performance of the second 90° electrical bridge 120. The specific way of grounding the first bridge arm 121 of the second 90° electrical bridge 120 and / or the second bridge arm 122 of the second 90° electrical bridge 120 is consistent with the specific way of grounding the first bridge arm 111 of the first 90° electrical bridge 110 and / or the first bridge arm 112 of the first 90° electrical bridge 110, which will not be repeated here.

[0101] In some embodiments of the present application, the second 90° electrical bridge 120 can also include a fifth bridge arm 125, so as to further increase the working bandwidth of the second 90° electrical bridge 120. The specific layout of the fifth bridge arm 125 of the second 90° electrical bridge 120 is consistent with the specific layout of the fifth bridge arm 115 of the first 90° electrical bridge 110, which will not be repeated here.

[0102] In some embodiments of the present application, the third bridge arm 123 and the fourth bridge arm 124 of the second 90° electrical bridge 120 are both in a meandering shape, so as to reduce the size of the third bridge arm 123 and the fourth bridge arm 124 in the X direction, and further reduce the size of the second 90° electrical bridge 120, which is conducive to the miniaturization of the radio frequency device 100.

[0103] Referring to Figure 8A , Figure 8B , Figure 9A and Figure 9BIn some embodiments of the present application, the radio frequency device 100 further comprises a substrate 170 for supporting. The substrate 170 comprises a first side 171 and a second side 172. The first side 171 and the second side 172 can be oppositely arranged along a Z direction. Exemplarily, the Z direction is perpendicular to the X direction. The first 90° bridge 110 and the second 90° bridge 120 can be arranged on the first side 171 of the substrate 170. The second side 172 of the substrate 170 is provided with a metal layer 173 for providing reliable grounding and conducting functions. The first filter 130 and the second filter 140 are arranged on the metal layer 173.

[0104] In some embodiments of the present application, the first filter 130 and the second filter 140 can be dielectric substrate filters or cavity filters.

[0105] For example, referring to Figures 8A-8C , the first filter 130 and the second filter 140 can both be dielectric substrate filters. Specifically, the first filter 130 comprises a substrate 131, a filter circuit 132 and a shielding cover 133. The filter circuit 132 is arranged 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 external radiation of electromagnetic waves generated by the filter circuit. Exemplarily, the filter circuit 132 comprises 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 the first port a1 of the first 90° bridge 110. The second connection port 1322 can be used to connect the first port a2 of the second 90° bridge 120.

[0106] Similarly, the second filter 140 also comprises 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. 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 parts and facilitating the realization of 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 comprises a first connection port 1421, a second connection port 1422 and a plurality of resonators 1423. The first connection port 1421 can be used to connect the second port b1 of the first 90° bridge 110. The second connection port 1422 can be used to connect the second port b2 of the second 90° bridge 120.

[0107] For example, referring to Figures 9A-9C , the first filter 130 and the second filter 140 are both cavity filters. Specifically, the first filter 130 comprises a cavity 134 and a filter circuit 132 arranged in the cavity 134.

[0108] The substrate 170 can serve as a tuning cover plate of the first filter 130. In this way, the first filter 130 does not need to be additionally provided with a tuning cover plate, thereby reducing the number of components and facilitating low cost and miniaturization of the radio frequency device 100. Figure 10 An exemplary structural diagram of the substrate 170 as a tuning cover plate in the embodiments of the present application is shown. Specifically, in combination with Figure 9A , Figure 9C and Figure 10 , the substrate 170 can be arranged on the opening of the cavity 134. A plurality of tuning sleeves 174 are arranged on the metal layer 173 of the substrate 170. Exemplarily, the plurality of tuning sleeves 174 can be fixed on the metal layer 173 by welding. One 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 to the plurality of resonators 1323 in the filter circuit 132 one by one. The frequency of the resonator 1323 can be adjusted by adjusting the depth of each tuning screw 175 into the corresponding resonator 1323.

[0109] It can be understood that the specific structure of the second filter 140 as a cavity filter is consistent with the specific structure of the first filter 130 as a cavity filter described above, and will not be repeated here. In addition, it can be understood that when the second filter 140 is a cavity filter, the substrate 170 can also serve as a tuning cover plate of the second filter 140. The specific cooperation mode of the substrate 170 and the second filter 140 is consistent with the specific cooperation mode of the substrate 170 and the first filter 130 described above, and will not be repeated here.

[0110] 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 with the first filter 130 and the second filter 140 respectively through a metalized via or a filter port connecting pin; the first port a2 and the second port b2 of the second 90° bridge 120 can be connected with the first filter 130 and the second filter 140 respectively through a metalized via or a filter port connecting pin. For the convenience of description, the connection mode of the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130 is taken as an example for description.

[0111] Figure 11A An exemplary connection mode one of the first port a1 of the first 90° bridge 110 and the first connection port 1321 of the first filter 130 in the embodiments of the present application is shown. As shown in Figure 11AAs shown, the substrate 170 is provided with a first metallized via 176 which is in communication with the first port a1. The substrate 131 is provided with a second metallized via 135 which is in communication with the first connection port 1321. The first metallized via 175 and the second metallized via 135 are aligned, so that the first port a1 of the first 90° electric bridge 110 can be in mutual conduction with the first connection port 1321 of the first filter 130.

[0112] Figure 11B Fig. 2 shows another exemplary connection mode between the first port a1 of the first 90° electric bridge 110 and the first connection port 1321 of the first filter 130. As shown, the first filter 130 includes a connection pin 136 which is in communication with the first connection port 1321. The end of the connection pin 136 penetrates the substrate 170 to be connected with the port pad 116 corresponding to the first port a1 of the first 90° electric bridge 110, so that the first port a1 of the first 90° electric bridge 110 can be in mutual conduction with the first connection port 1321 of the first filter 130. Figure 11B

[0113] In some embodiments of the present application, the substrate 170 can 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 limit thereto.

[0114] It can be understood that the present embodiment is an exemplary description of the technical solution of the present application, and other modifications can be made by those skilled in the art. For example, in the present embodiment, the radio frequency device 100 can be used to realize the function of combining or splitting. In other embodiments, the radio frequency device 100 can also be used to realize the function of filtering. Exemplarily, the radio frequency device 100 with the function of filtering can be used as the above-mentioned filter 105, at this time, the filter 105 is a non-reflective filter. When the non-reflective filter is cascaded with other devices (for example, a reflective device with frequency selection characteristics), the resonance phenomenon can be effectively weakened.

[0115] Figure 12 Fig. 4 shows a schematic diagram of the filtering of the radio frequency device 100 in some embodiments of the present application. Referring to Fig. 4, the fourth port d1 of the first 90° electric bridge 110 and the third port c2 of the second 90° electric bridge 120 in the radio frequency device 100 are respectively connected with the signal absorption load 150. One of the third port c1 of the first 90° electric bridge 110 and the fourth port d2 of the second 90° electric bridge 120 is used to receive a signal, and the other is used to output a signal after filtering. Figure 12

[0116] ​​For example, 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 pass through the first filter 130 and the second filter 140 into the second 90° bridge 120, 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 transmission, thereby achieving filtering of signal S3. The specific transmission process of signal S1 can be found in [reference needed]. Figure 6A The details and related descriptions are omitted here. For the specific process of signal S2 being eliminated, please refer to [reference needed]. Figure 7A The details and related descriptions will not be elaborated here.

[0117] It is understandable that the filtering principle of signal S3 input from the fourth port d2 of the second 90° bridge 120 is the same as the filtering principle of signal S3 input from the third port c1 of the first 90° bridge 110, and will not be elaborated here.

[0118] Figure 13 A schematic diagram of the filtering of the radio frequency device 100 in another embodiment of this application is shown. (See reference...) Figure 13 In other embodiments of this application, the third port c1 and the fourth port d1 of the first 90° bridge 110 in the radio frequency device 100 are respectively connected to the signal absorption load 150. One of the third port c2 and the fourth port d2 of the second 90° bridge 120 is used to receive a signal, and the other is used to output the filtered signal.

[0119] For example, signal S3 (as the third signal) includes signals S1 and S2. When signal S3 is input from the third port c2 of the second 90° bridge 120, signal S1 in signal S3 can pass through the first filter 130 and the second filter 140 into the first 90° bridge 110, and is eliminated during transmission within 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, thereby achieving filtering of signal S3. The specific process of eliminating signal S1 can be found in [reference needed]. Figure 7B The details and related descriptions are omitted here. For the specific transmission process of signal S2, please refer to [reference needed]. Figure 6B The details and related descriptions will not be elaborated here.

[0120] Similarly, it can be understood that the filtering principle when signal S3 is input from the fourth port d2 of the second 90° bridge 120 is the same as the filtering principle when signal S3 is input from the third port c2 of the second 90° bridge 120, and will not be elaborated here.

[0121] The above describes the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application is introduced in combination with some embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. The present application can also not use these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details are omitted in the description. It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0122] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "outer", "inner", "circumferential", "radial", "axial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0123] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connect", "fit" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0124] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A radio frequency device, characterized by, The radio frequency device is used for synthesizing a first signal and a second signal into a third signal, or splitting the third signal into the first signal and the second signal; the radio frequency device comprises 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 ports, the first port of the first 90° bridge and the fourth port of the first 90° bridge are through ports, and the fourth port of the first 90° bridge is connected to a signal absorption load; The first port of the second 90° bridge and the second port of the second 90° bridge are isolated ports; 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 working frequency range of the first 90° bridge and the working frequency range of the second 90° bridge cover the frequency of the first signal and the frequency of the second signal; the working frequency range of the first filter and the working frequency range of the second filter cover the frequency of the first signal and 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; The third port of the first 90° bridge is used for receiving the first signal, the third port of the second 90° bridge is used for receiving the second signal, when the third port of the first 90° bridge inputs the first signal and the third port of the second 90° bridge inputs the second signal, 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 for receiving 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 by, The radio frequency device is used for filtering a third signal comprising a first signal and a second signal; the radio frequency device comprises 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 ports, the first port of the first 90° bridge and the fourth port of the first 90° bridge are through ports, the first port of the second 90° bridge and the second port of the second 90° bridge are isolated ports, the second port of the second 90° bridge and the third port of the second 90° bridge are through ports, and the fourth port of the first 90° bridge and the third port of the second 90° bridge are respectively connected to signal absorption 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 working frequency band of the first 90° electric bridge and the working frequency band of the second 90° electric bridge both 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 and 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° electric bridge and the fourth port of the second 90° electric bridge is used for receiving the third signal, and the other is used for outputting the first signal.

5. A radio frequency device, characterized by, The radio frequency device is used for filtering a third signal composed of a first signal and a second signal, and comprises a first 90° electric bridge, a second 90° electric bridge, a first filter and a second filter, wherein: The first port of the first 90° electric bridge and the second port of the first 90° electric bridge are isolated from each other, the first port of the first 90° electric bridge and the fourth port of the first 90° electric bridge are connected to each other, and the third port of the first 90° electric bridge and the fourth port of the first 90° electric bridge are respectively connected to a signal absorbing load; The first port of the second 90° electric bridge and the second port of the second 90° electric bridge are isolated from each other; The first port of the first 90° electric bridge is connected to the first port of the second 90° electric bridge through the first filter, and the second port of the first 90° electric bridge is connected to the second port of the second 90° electric bridge through the second filter; The working frequency band of the first 90° electric bridge and the working frequency band of the second 90° electric bridge both 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 and 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° electric bridge and the fourth port of the second 90° electric bridge is used for receiving the third signal, and the other is used for outputting the second signal.

7. 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 first 90° electric bridge is grounded; and / or, The second bridge arm between the third port and the fourth port in the first 90° electric 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° electric 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 working frequency band of the first 90° electric 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° electric bridge are both in a meander 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° electric bridge; and / or, the second bridge arm between the third port and the fourth port in the second 90° electric 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° electrical bridge, a midpoint of a third bridge arm between the first port and the fourth port and a midpoint of a fourth bridge arm between the second port and the third port are connected by a fifth bridge arm, lengths between the third bridge arm and the fourth bridge arm are both λ / 2, wherein λ is a wavelength of a signal at a center frequency of an operating frequency band of the second 90° electrical bridge; The third bridge arm and the fourth bridge arm of the second 90° electrical bridge are in a meander shape.

12. The radio-frequency device according to any one of claims 1, 3 or 5, characterized in that, The radio frequency device further comprises a substrate, the first 90° electrical bridge and the second 90° electrical bridge are arranged on the same side of the substrate, a metal layer is arranged on a side of the substrate opposite to the first 90° electrical bridge and the second 90° electrical 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 The cavity of the cavity filter is provided with a plurality of resonators, the substrate is arranged on an opening of the cavity, the metal layer is provided with a plurality of tuning sleeves, one tuning screw is fixed in each of the tuning sleeves, and the plurality of tuning screws are in one-to-one correspondence with the plurality of resonators.

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° electrical bridge are connected with the first filter and the second filter respectively by metalized vias or filter port connection pins, and the first port and the second port of the second 90° electrical bridge are connected with the first filter and the second filter respectively by metalized vias or filter port connection pins.

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

18. An antenna system, characterized by The radio frequency device of any one of claims 1-17 is connected with a radiating unit.

19. A base station, characterized by The antenna system of claim 18 is mounted on an antenna mounting rack.

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