Omnidirectional indoor distribution antenna

Abstract

The invention provides an omnidirectional indoor distribution antenna which comprises a vertical polarized antenna, a horizontal polarized antenna and a passive frequency mixing module, the passive frequency mixing module comprises a frequency selection circuit, a combining circuit and a frequency mixing circuit, and the frequency selection circuit is configured to divide an input signal of an input port into a first signal, a second signal, a third signal and a fourth signal; the combining circuit is configured to combine the first signal and the second signal to generate a combined signal; the combined signal is output to the vertical polarized antenna; the frequency mixing circuit is electrically connected with the frequency selection circuit and the horizontal polarization antenna, and is configured to mix the third signal and the fourth signal to generate a frequency mixing signal; and the frequency mixing signal is output to the horizontal polarization antenna. The omnidirectional indoor distribution antenna has the advantages of high efficiency, low cost, low power consumption and the like, original indoor distribution inter-system feeder lines and devices do not need to be transformed, 5G signal bandwidth expansion can be achieved through a simple circuit structure, plug and play is achieved, and implementation and maintenance are easy.

Description

Omnidirectional indoor antenna Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an omnidirectional indoor antenna. Background Art

[0002] With the development of communication technology, users are increasingly using 5G signals in a variety of scenarios. Current indoor coverage methods include traditional passive DAS (Distributed Antenna System), outdoor base station indoor coverage, and new digital indoor coverage. Traditional passive DAS has limited capacity, outdoor base station indoor coverage is expensive, and new digital indoor coverage is both costly and difficult to build. Therefore, achieving efficient, low-cost, and high-quality indoor 5G signal coverage has become a top concern for operators.

[0003] Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and proposes an omnidirectional indoor antenna.

[0005] In order to achieve the above-mentioned object, the present disclosure provides an omnidirectional room-space antenna, which includes: a vertically polarized antenna, a horizontally polarized antenna and a passive mixing module, wherein the passive mixing module includes:

[0006] a frequency selection circuit electrically connected to an input port of the passive mixing module and configured to divide an input signal of the input port into a first signal, a second signal, a third signal, and a fourth signal; wherein a minimum frequency of the first signal is greater than a frequency of any one of the second signal, the third signal, and the fourth signal, and a frequency of the second signal is less than a frequency of any one of the third signal and the fourth signal;

[0007] a combining circuit, the combining circuit being electrically connected to the frequency selection circuit and the vertically polarized antenna, and configured to combine the first signal and the second signal to generate a combined signal; and output the combined signal to the vertically polarized antenna;

[0008] A frequency mixing circuit is electrically connected to the frequency selection circuit and the horizontally polarized antenna, and is configured to mix the third signal and the fourth signal to generate a mixed signal; and output the mixed signal to the horizontally polarized antenna.

[0009] Wherein, the frequency selection circuit has a third output port for outputting the third signal, and a fourth output port for outputting the fourth signal;

[0010] The mixing circuit comprises:

[0011] a mixer, wherein a first input port of the mixer is electrically connected to the third output port of the frequency selection circuit, a second input port of the mixer is electrically connected to the fourth output port of the frequency selection circuit, and the mixer is configured to mix the third signal and the fourth signal to generate the intermediate signal;

[0012] A first filter is electrically connected to the output port of the mixer and is configured to filter the intermediate signal to generate the mixed signal; and output the mixed signal to the horizontally polarized antenna.

[0013] The mixer includes one of a double-balanced mixer and a double-balanced IQ mixer.

[0014] The mixer is a double-balanced IQ mixer, and the mixing circuit further includes:

[0015] a first matching balun connected between the frequency selection circuit and the first input port of the mixer;

[0016] a second matching balun connected between the frequency selection circuit and the second input port of the mixer;

[0017] A third matching balun is connected between the output port of the mixer and the first filter.

[0018] The first filter includes but is not limited to LTCC (Low-Temperature Cofired Ceramics) filters.

[0019] Wherein, the frequency selection circuit includes one of a duplexer and a quadplexer.

[0020] The frequency selection circuit includes a quadplexer, the quadplexer includes a plurality of filters, the operating frequency bands of the plurality of filters are different from each other, and the plurality of filters include:

[0021] a second filter, wherein an output port of the second filter is electrically connected to the first input port of the combiner circuit and is configured to filter the input signal to obtain the first signal;

[0022] a third filter, wherein an output port of the third filter is electrically connected to the second input port of the combiner circuit and is configured to filter the input signal to obtain the second signal;

[0023] a fourth filter, wherein an output port of the fourth filter is electrically connected to the first input port of the mixing circuit and is configured to filter the input signal to obtain a third signal;

[0024] A fifth filter, wherein the output port of the fifth filter is electrically connected to the second input port of the mixing circuit, and is configured to filter the input signal to obtain a fourth signal.

[0025] The operating frequency band of the second filter is greater than the operating frequency band of any one of the third filter, the fourth filter and the fifth filter, and the operating frequency band of the third filter is smaller than the operating frequency band of any one of the fourth filter and the fifth filter.

[0026] Wherein, the operating frequency bands of the fourth filter and the fifth filter are both greater than 900 MHz and less than 1800 MHz.

[0027] The frequency selection circuit includes a plurality of frequency division sub-circuits, and different frequency division sub-circuits are used to separate signals of different frequency bands.

[0028] Wherein, the plurality of frequency division sub-circuits include:

[0029] a first frequency division sub-circuit, the first frequency division sub-circuit being electrically connected to the input port of the passive frequency mixing module and configured to separate the input signal into a first signal and a residual signal;

[0030] a second frequency dividing sub-circuit, the second frequency dividing sub-circuit being connected to the output port of the first frequency dividing sub-circuit and being configured to receive the remaining signal and separate the second signal and the third signal from the remaining signal;

[0031] a third frequency dividing sub-circuit, the third frequency dividing sub-circuit being connected to the output port of the first frequency dividing sub-circuit, and the third frequency dividing sub-circuit being configured to receive the remaining signal and separate the fourth signal from the remaining signal.

[0032] The first frequency division sub-circuit includes a first duplexer, and the first duplexer includes:

[0033] a sixth filter, wherein an output port of the sixth filter is electrically connected to the first input port of the combiner circuit and is configured to filter the input signal to obtain the first signal;

[0034] A seventh filter, wherein the output port of the seventh filter is electrically connected to the input port of the second frequency division sub-circuit and the input port of the third frequency division sub-circuit, and is configured to filter the input signal to obtain the residual signal, and the sixth filter and the seventh filter have different operating frequency bands.

[0035] The second frequency division sub-circuit includes a second duplexer, and the second duplexer includes:

[0036] an eighth filter, wherein an output port of the eighth filter is electrically connected to the second input port of the combiner circuit and is configured to filter the residual signal to obtain the second signal;

[0037] A ninth filter, wherein the output port of the ninth filter is electrically connected to the first input port of the mixing circuit, and is configured to filter the remaining signal to obtain the third signal, and the operating frequency bands of the eighth filter and the ninth filter are different.

[0038] The third frequency division sub-circuit includes a matching circuit and a tenth filter, the matching circuit is configured to perform impedance matching on the first duplexer and the tenth filter to obtain an impedance-matched signal; the output port of the tenth filter is electrically connected to the second input port of the mixing circuit, and the tenth filter is configured to filter the impedance-matched signal to obtain a fourth signal.

[0039] The first duplexer and the second duplexer include LTCC duplexers, and the tenth filter includes a dielectric filter.

[0040] Wherein, the vertically polarized antenna includes:

[0041] A single-arm vibrator, wherein the single-arm vibrator is cone-shaped;

[0042] The reflecting structure is conical, the small-diameter end of the single-arm oscillator is arranged opposite to the small-diameter end of the reflecting structure, the horizontally polarized antenna is located between the single-arm oscillator and the reflecting structure, and the reflecting structure and the single-arm oscillator are both detachably connected to the horizontally polarized antenna.

[0043] Wherein, the reflective structure includes:

[0044] reflective cones;

[0045] An annular edge extends from an end of the reflection cone away from the single-arm oscillator in a direction away from the single-arm oscillator.

[0046] In which, the vertically polarized antenna also includes multiple first connecting parts, the conical surface of the reflecting cone has multiple first assembly holes, and the multiple first assembly holes are arranged at intervals around the axial direction of the reflecting cone. The horizontally polarized antenna has multiple first mounting holes, and at least a portion of each first connecting part is inserted into one of the first mounting holes and one of the first assembly holes.

[0047] Wherein, the single-arm vibrator includes:

[0048] a vibrator body, the vibrator body being used to transmit or receive signals;

[0049] A plurality of connecting arms, wherein a first end of the connecting arm is connected to the vibrator body, a second end of the connecting arm is connected to the horizontally polarized antenna, and the plurality of connecting arms are arranged at intervals around the axial direction of the vibrator body.

[0050] The horizontally polarized antenna further includes a plurality of second mounting holes, which are spaced apart axially around the vertically polarized antenna. The second mounting holes are spaced apart from the first mounting holes, and the second end of the connecting arm is passed through the second mounting holes.

[0051] In which, the connecting arm includes a first connecting section, a second connecting section and a snap-on reducing section connected in sequence, the first connecting section and the second connecting section are arranged at an angle, the first connecting section is connected to the vibrator body, the snap-on reducing section is located at an end of the second connecting section away from the first connecting section, and the snap-on reducing section is snapped into the second mounting hole.

[0052] In which, the vertically polarized antenna also includes a plurality of second connecting parts, and the horizontally polarized antenna also includes a plurality of second mounting holes, the plurality of second mounting holes are arranged at intervals around the axial direction of the vertically polarized antenna, the second mounting holes are arranged at intervals from the first mounting holes, the connecting arm includes a first mounting segment and a second mounting segment at an angle, the first mounting segment is connected to the vibrator body, the second mounting segment is parallel to the horizontally polarized antenna, the second mounting segment has a connecting hole, and the second connecting part is passed through the connecting hole and the second mounting hole to connect the single-arm vibrator to the horizontally polarized antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0054] FIG1 is a schematic diagram of the overall structure of an omnidirectional indoor antenna according to an optional embodiment of the present disclosure;

[0055] FIG2 is a schematic diagram showing the positional relationship between the vertically polarized antenna, the horizontally polarized antenna, and the passive mixing module in FIG1 ;

[0056] FIG3 shows a schematic diagram of the connection relationship between the single-arm dipole and the horizontally polarized antenna in FIG2 ;

[0057] FIG4 is a schematic diagram showing the connection relationship between the reflective structure and the horizontally polarized antenna in FIG1 ;

[0058] FIG5 is a schematic diagram showing the connection relationship between the reflective structure and the chassis in FIG1 ;

[0059] FIG6 is a schematic diagram showing the positional relationship between the passive mixing module and the chassis in FIG1 ;

[0060] FIG7 shows a schematic structural diagram of the passive mixing module in FIG6 ;

[0061] FIG8 shows a transmission diagram of a signal in the omnidirectional indoor antenna in FIG1 ;

[0062] FIG9 shows a signal transmission diagram of the frequency selection circuit in FIG8 ;

[0063] FIG10 shows a signal transmission diagram of the mixing circuit in FIG8 ;

[0064] FIG11 is a schematic structural diagram of the omnidirectional indoor antenna in FIG1 ;

[0065] FIG12 shows a side view of the omnidirectional room antenna in FIG11;

[0066] FIG13 shows a top view of the omnidirectional room antenna in FIG11;

[0067] FIG14 shows a graph of the voltage standing wave ratio of the vertically polarized antenna corresponding to the omnidirectional indoor antenna in FIG11;

[0068] FIG15 shows the radiation pattern of the vertically polarized antenna corresponding to the omnidirectional room antenna in FIG11;

[0069] FIG16 shows a graph of the voltage standing wave ratio of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG11;

[0070] FIG17 shows the radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional room antenna in FIG11;

[0071] FIG18 shows the H-plane radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG11 at an elevation angle theta=60°;

[0072] FIG19 is a schematic structural diagram of an omnidirectional indoor antenna according to another optional embodiment of the present disclosure;

[0073] FIG20 shows a side view of the omnidirectional room antenna in FIG19;

[0074] FIG21 shows a top view of the omnidirectional indoor antenna in FIG19;

[0075] FIG22 shows a graph of the voltage standing wave ratio of the vertically polarized antenna corresponding to the omnidirectional indoor antenna in FIG19 ;

[0076] FIG23 shows the radiation pattern of the vertically polarized antenna corresponding to the omnidirectional room antenna in FIG19;

[0077] FIG24 shows a graph of the voltage standing wave ratio of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG19 ;

[0078] FIG25 shows the radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional room antenna in FIG19;

[0079] FIG26 shows the H-plane radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG19 at an elevation angle theta=60°;

[0080] FIG27 is a schematic structural diagram of an omnidirectional indoor antenna according to another optional embodiment of the present disclosure;

[0081] FIG28 shows a side view of the omnidirectional room antenna in FIG27;

[0082] FIG29 shows a top view of the omnidirectional room antenna in FIG27 ;

[0083] FIG30 shows a graph of the voltage standing wave ratio of the vertically polarized antenna corresponding to the omnidirectional indoor antenna in FIG27;

[0084] FIG31 shows the radiation pattern of the vertically polarized antenna corresponding to the omnidirectional room antenna in FIG27;

[0085] FIG32 shows a graph of the voltage standing wave ratio of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG27;

[0086] FIG33 shows the radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional room antenna in FIG27;

[0087] FIG34 shows the H-plane radiation pattern of the horizontally polarized antenna corresponding to the omnidirectional indoor antenna in FIG27 at an elevation angle theta=60°;

[0088] FIG35 is a schematic structural diagram of a passive mixing module according to another optional embodiment of the present disclosure;

[0089] FIG36 is a signal transmission diagram of a frequency selection circuit in an omnidirectional indoor antenna according to another optional embodiment of the present disclosure;

[0090] FIG37 is a signal transmission diagram of a frequency mixing circuit in an omnidirectional indoor antenna according to another optional embodiment of the present disclosure;

[0091] FIG38 is a schematic diagram showing the connection relationship between a single-arm dipole and a horizontally polarized antenna in an omnidirectional room antenna according to another optional embodiment of the present disclosure;

[0092] FIG39 is a schematic diagram showing the connection relationship between the single-arm dipole and the horizontally polarized antenna in the omnidirectional indoor antenna of another optional embodiment of the present disclosure.

[0093] 10. Vertically polarized antenna; 11. Single-arm oscillator; 111. oscillator body; 112. Connecting arm; 113. First connecting section; 114. Second connecting section; 115. Snap-fit ​​reducing section; 116. Connecting hole; 117. First mounting section; 118. Second mounting section; 119. Annular sleeve; 12. Reflecting structure; 121. Reflecting cone; 122. Annular edge; 123. First assembly hole; 124. Outward-turned connecting edge; 125. Second assembly hole; 13. First connecting piece; 1 31. First buckle section; 132. Columnar connecting section; 133. Second buckle section; 14. Second connecting member; 15. Chassis; 151. Third assembly hole; 17. Third connecting member; 20. Horizontally polarized antenna; 21. First mounting hole; 22. Second mounting hole; 23. Feed network; 231. Feed line; 24. Dipole; 25. Ground layer; 26. Dielectric substrate; 30. Passive mixing module; 31. Input port; 32. PCB board; 33. First output port; 34. Second output port; 40, frequency selection circuit; 41, quadplexer; 411, second filter; 412, third filter; 413, fourth filter; 414, fifth filter; 42, first frequency division sub-circuit; 43, second frequency division sub-circuit; 44, third frequency division sub-circuit; 441, matching circuit; 442, tenth filter; 45, first duplexer; 451, sixth filter; 452, seventh filter; 46, second duplexer; 461, eighth filter; 462, third Nine filters; 50. Combiner circuit; 60. Mixer circuit; 61. Mixer; 62. First filter; 63. First matching balun; 64. Second matching balun; 65. Third matching balun; 71. Support column; 72. Deformable member; 721. Expanded diameter section; 722. Reduced diameter section; 80. Cable jumper; 90. N-type female connector; 100. First signal; 110. Second signal; 120. Third signal; 130. Fourth signal; 140. Cover; 150. Connecting wires. DETAILED DESCRIPTION

[0094] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0095] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0096] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0097] As used herein, "parallel" and "perpendicular" include the conditions described and conditions similar to the conditions described, and the range of the similar conditions is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°.

[0098] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0099] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0100] As shown in Figures 1 to 18, embodiments of the present disclosure provide an omnidirectional indoor antenna, comprising a vertically polarized antenna 10, a horizontally polarized antenna 20, and a passive mixing module 30. The passive mixing module 30 includes a frequency selection circuit 40, a combining circuit 50, and a mixing circuit 60. By installing the passive mixing module 30 within the omnidirectional indoor antenna, multiple signals can be transmitted within a single-channel DAS distribution system, achieving a MIMO (Multiple-Input Multiple-Output) effect, facilitating low-cost, efficient, and high-quality indoor 5G signal coverage.

[0101] In an embodiment of the present disclosure, a frequency selection circuit 40 is electrically connected to the input port 31 of the passive mixing module 30 and is configured to separate the input signal at the input port 31 into a first signal 100, a second signal 110, a third signal 120, and a fourth signal 130. The minimum frequency of the first signal 100 is greater than the frequency of any of the second signal 110, the third signal 120, and the fourth signal 130, and the frequency of the second signal 110 is less than the frequency of any of the third signal 120 and the fourth signal 130. By providing the frequency selection circuit 40 in the passive mixing module 30, a single input signal is divided into multiple signals of different frequency bands, which facilitates subsequent processing by the combining circuit 50 and the mixing circuit 60, thereby facilitating the realization of a MIMO effect.

[0102] In an embodiment of the present disclosure, a combiner circuit 50 is electrically connected to the frequency selection circuit 40 and the vertically polarized antenna 10. The combiner circuit 50 is configured to combine the first signal 100 and the second signal 110 to generate a combined signal, and then output the combined signal to the vertically polarized antenna 10. The combiner circuit 50 combines the first signal 100 and the second signal 110 and transmits the combined signal to the vertically polarized antenna 10. The communication frequency band of the generated combined signal includes traditional communication frequency bands, such as 900 MHz, 1800 MHz, 2 GHz, 2.3 GHz, and 2.6 GHz frequency band signals.

[0103] In the embodiment of the present disclosure, a frequency selection circuit 40 and a frequency mixing circuit 60 are combined to realize low-loss signal branching through a combination of a multiplexer and a filter.

[0104] Optionally, the first signal 100 may be a 900 MHz frequency band signal, and the second signal 110 may be a 1800 MHz, 2 GHz, 2.3 GHz, or 2.6 GHz frequency band signal.

[0105] Optionally, the frequency bands of the third signal 120 and the fourth signal 130 are both greater than 900 MHz and less than 1800 MHz, and the frequency bands of the third signal 120 and the fourth signal 130 are different.

[0106] Since the multiplexer in the frequency selection circuit 40 operates by dividing different signals by frequency band using high-pass and low-pass filters, decoupling the third signal 120 and the fourth signal 130 from the original input signal necessarily requires separating the 900 MHz signal and the 1800 MHz, 2 GHz, 2.3 GHz, and 2.6 GHz signals from the original input signal into two separate paths. A combiner circuit 50 is provided at the antenna port to combine the first signal 100 and the second signal 110 before the antenna can transmit the signal.

[0107] In the embodiment of the present disclosure, the mixing circuit 60 is electrically connected to the frequency selection circuit 40 and the horizontally polarized antenna 20. The mixing circuit 60 is configured to mix the third signal 120 and the fourth signal 130 to generate a mixed signal and output the mixed signal to the horizontally polarized antenna 20. The mixing circuit 60 is used to mix the third signal 120 and the fourth signal 130 to obtain a mixed signal for bandwidth expansion, thereby reducing frequency conversion loss, ensuring linearity, and meeting communication requirements.

[0108] Optionally, the frequency band of the mixed signal is the sum of the frequency bands of the third signal 120 and the fourth signal 130. Of course, the frequency band of the mixed signal and the frequency bands of the third signal 120 and the fourth signal 130 may satisfy other relationships and can be designed based on specific usage requirements, and are not specifically limited here.

[0109] Optionally, the mixed frequency signal may be a 2.6 GHz frequency band signal, or a signal of other frequency bands, which is not specifically limited here.

[0110] In an embodiment of the present disclosure, as shown in FIG10 , the frequency selection circuit 40 has a third output port for outputting a third signal 120 and a fourth output port for outputting a fourth signal 130. The frequency mixing circuit 60 includes a mixer 61 and a first filter 62. The first input port of the mixer 61 is electrically connected to the third output port of the frequency selection circuit 40, and the second input port of the mixer 61 is electrically connected to the fourth output port of the frequency selection circuit. The mixer 61 is configured to mix the third signal 120 and the fourth signal 130 to generate an intermediate signal. The first filter 62 is electrically connected to the output port of the mixer 61 and is configured to filter the intermediate signal to generate a mixed signal and output the mixed signal to the horizontally polarized antenna 20. The mixer 61 can mix signals of two different frequency bands to generate an intermediate signal. The first filter 62 is configured to filter the intermediate signal to generate a mixed signal, thereby filtering out out-of-band spurious signals generated by mixing to ensure communication quality. The mixed signal is then output to the horizontally polarized antenna 20. The frequency band of the mixed signal is different from that of the third signal 120 and the fourth signal 130 .

[0111] Optionally, the mixer 61 includes one of a double-balanced mixer and a double-balanced IQ mixer.

[0112] In an embodiment of the present disclosure, as shown in Figure 10, mixer 61 is a double-balanced IQ mixer. Mixing circuit 60 also includes a first matching balun 63, a second matching balun 64, and a third matching balun 65. The first matching balun 63 is connected between the frequency selection circuit 40 and the first input port of mixer 61; the second matching balun 64 is connected between the frequency selection circuit 40 and the second input port of mixer 61; and the third matching balun 65 is connected between the output port of mixer 61 and the first filter 62. The use of a double-balanced IQ mixer not only achieves an optimal combination of isolation, linearity, and noise figure, but also improves image rejection and ensures the nonlinear performance of the system. By providing multiple matching baluns within mixing circuit 60, impedance conversion can be performed between the mixed signal and the third and fourth signals 120 and 130.

[0113] It should be noted that there are two orthogonal sub-ports at the corresponding connection positions of the mixer 61 and the matching balun. For example, the first input port of the mixer 61 connected to the first matching balun 63 includes two orthogonal sub-input ports. Similarly, the output port of the mixer 61 connected to the third matching balun 65 also includes two orthogonal sub-output ports, as shown in Figure 10.

[0114] In the embodiment of the present disclosure, the first filter 62 includes but is not limited to an LTCC filter. That is, in the present disclosure, the first filter 62 may be an LTCC filter or other filters, and no specific limitation is made here.

[0115] Optionally, the frequency selection circuit 40 includes one of a duplexer and a quadplexer 41 .

[0116] In an embodiment of the present disclosure, please refer to Figure 9. The frequency selection circuit 40 includes a quadplexer 41, which includes multiple filters. The operating frequency bands of the multiple filters are different from each other. The output port of the second filter 411 is electrically connected to the first input port of the combiner circuit 50, and is configured to filter the input signal to obtain the first signal 100; the output port of the third filter 412 is electrically connected to the second input port of the combiner circuit 50, and is configured to filter the input signal to obtain the second signal 110; the output port of the fourth filter 413 is electrically connected to the first input port of the mixing circuit 60, and is configured to filter the input signal to obtain the third signal 120; the output port of the fifth filter 414 is electrically connected to the second input port of the mixing circuit 60, and is configured to filter the input signal to obtain the fourth signal 130.

[0117] The quadplexer 41 has four filters with different filtering frequency bands to branch the first signal 100, the second signal 110, the third signal 120 and the fourth signal 130 in the input signal so as to facilitate subsequent processing by the combining circuit 50 and the mixing circuit 60, thereby facilitating the realization of the MIMO effect.

[0118] Optionally, the quadplexer 41 is a dielectric quadplexer.

[0119] In the embodiment of the present disclosure, the operating frequency band of the second filter 411 is greater than the operating frequency band of any of the third filter 412, the fourth filter 413, and the fifth filter 414, and the operating frequency band of the third filter 412 is less than the operating frequency band of any of the fourth filter 413 and the fifth filter 414. The second to fifth filters 411 to 414 have different operating frequency bands, thereby dividing the input signal into signals of different frequency bands. The relationship between the operating frequency bands of the second filter 411, the third filter 412, the fourth filter 413, and the fifth filter 414 is related to the signals they output.

[0120] It should be noted that if the frequency band relationship between the first signal 100, the second signal 110, the third signal 120 and the fourth signal 130 changes, the relationship between the operating frequency bands of the second filter 411, the third filter 412, the fourth filter 413 and the fifth filter 414 will also change accordingly. No specific restrictions are made here.

[0121] Preferably, the operating frequency bands of the fourth filter 413 and the fifth filter 414 are both greater than 900 MHz and less than 1800 MHz.

[0122] In some embodiments, referring to Figures 1, 11, and 12, a vertically polarized antenna 10 includes a single-arm dipole 11 and a reflective structure 12. The single-arm dipole 11 is conical; the reflective structure 12 is conical, with the smaller end of the single-arm dipole 11 positioned opposite the smaller end of the reflective structure 12. A horizontally polarized antenna 20 is positioned between the single-arm dipole 11 and the reflective structure 12. Both the reflective structure 12 and the single-arm dipole 11 are detachably connected to the horizontally polarized antenna 20. The vertically polarized antenna 10 utilizes the single-arm dipole 11 and the reflective structure 12 to form an asymmetric deformed biconical antenna, enabling vertical broadband coverage. It offers the advantages of wide bandwidth, a simple physical structure, and ease of use.

[0123] In the specific embodiment shown in FIG13 , the horizontally polarized antenna 20 adopts the loop antenna principle and realizes horizontal polarization through a complementary planar dipole circular array. The array feeding structure can easily realize horizontal omnidirectional coverage and has the advantages of simple structure and low loss.

[0124] In the specific embodiment shown in FIG. 13 , a circular array is formed by five dipoles 24 .

[0125] In some embodiments, as shown in Figures 11 and 12, the reflective structure 12 includes a reflective cone 121 and an annular edge 122. The annular edge 122 extends from an end of the reflective cone 121 away from the single-arm oscillator 11 in a direction away from the single-arm oscillator 11. By providing the annular edge 122 on the reflective structure 12, the high-frequency gain of the vertically polarized antenna 10 can be increased, while the circularity of the directivity pattern of the horizontally polarized antenna can be improved.

[0126] In some embodiments, as shown in Figures 2 and 4 , the vertically polarized antenna 10 further includes a plurality of first connectors 13. The conical surface of the reflective cone 121 has a plurality of first assembly holes 123, which are spaced apart axially around the reflective cone 121. The horizontally polarized antenna 20 has a plurality of first mounting holes 21, with at least a portion of each first connector 13 extending through one of the first mounting holes 21 and one of the first assembly holes 123. The first connector 13 extends through both the first mounting hole 21 and the first assembly hole 123 to achieve connection between the reflective cone 121 and the horizontally polarized antenna 20.

[0127] In the specific embodiment shown in FIG2 , the first connector 13 is a double-buckle nylon column. The first connector 13 includes a first buckle section 131, a columnar connecting section 132, and a second buckle section 133, which are sequentially connected. The first buckle section 131 and the second buckle section 133 are respectively located at opposite ends of the columnar connecting section 132. The width of the first buckle section 131 and the second buckle section 133 at one end near the columnar connecting section 132 is smaller than the diameter of the columnar connecting section 132, so that the first connector 13 can be easily locked in the first mounting hole 21 and the first assembly hole 123.

[0128] It should be noted that the maximum width of the first snap-fit ​​section 131 and the second snap-fit ​​section 133 is greater than the diameter of the first mounting hole 21 and the first assembly hole 123, and the diameter of the columnar connecting section 132 is greater than the diameter of the first mounting hole 21 and the first assembly hole 123, so as to ensure that the first connecting member 13 is stably assembled in the first mounting hole 21 and the first assembly hole 123.

[0129] In the specific embodiment shown in Figure 2, the first buckling section 131 and the second buckling section 133 are umbrella-shaped structures, which include a support column 71 and a deformable member 72. The deformable member 72 has at least one deformable seam, which is conducive to the deformation of the deformable member 72, and thus facilitates the deformable member 72 to penetrate into the first mounting hole 21 and the first assembly hole 123. The deformable member 72 includes an enlarged diameter section 721 and a reduced diameter section 722 connected in sequence. The connection position of the enlarged diameter section 721 and the reduced diameter section 722 is the position where the deformable member 72 has the largest width in the direction parallel to the horizontally polarized antenna 20.

[0130] In the specific embodiment shown in Figure 2, the support column 71 is located on the inner side of the deformable member 72, and the support column 71 is connected to the columnar connecting section 132. The deformable member 72 and the columnar connecting section 132 can be connected or not connected. There is no specific restriction here. It is only necessary to ensure that the deformable member 72 can be deformed.

[0131] It should be noted that the first connecting member 13 may also be of other structural forms, as long as the first connecting member 13 can assemble the reflection cone 121 and the horizontally polarized antenna 20 together. No specific limitation is made here.

[0132] In some optional embodiments, referring to Figures 1 to 3 , a single-arm oscillator 11 includes a oscillator body 111 and a plurality of connecting arms 112. The oscillator body 111 is used to transmit or receive signals. A first end of the connecting arm 112 is connected to the oscillator body 111, and a second end of the connecting arm 112 is connected to the horizontally polarized antenna 20. The plurality of connecting arms 112 are spaced apart axially around the oscillator body 111. The provision of the connecting arms 112 facilitates connection between the single-arm oscillator 11 and the horizontally polarized antenna 20.

[0133] In the specific embodiment shown in Figure 1, the omnidirectional room antenna also includes a cover 140, and the vertically polarized antenna 10, the horizontally polarized antenna 20 and the passive mixing module 30 are all located in the cover 140 to protect the vertically polarized antenna 10, the horizontally polarized antenna 20 and the passive mixing module 30 and prevent external structures from affecting their working performance.

[0134] It should be noted that, in order to more intuitively show the structure mainly used for the transmitting antenna, the structures used for connection, such as the connecting arm 112, the first connecting member 13 and other structures, are omitted in Figures 11 to 13.

[0135] Optionally, the vibrator body 111 has a plurality of positioning holes, and rivets pass through the positioning holes to connect with the connecting arm 112 .

[0136] As shown in Figure 3, the horizontally polarized antenna 20 also includes multiple second mounting holes 22, which are spaced apart axially around the vertically polarized antenna 10. The second mounting holes 22 are spaced apart from the first mounting hole 21. The second end of the connecting arm 112 is inserted into the second mounting hole 22. The second end of the connecting arm 112 is engaged in the second mounting hole 22, thereby stably connecting the single-arm dipole 11 to the horizontally polarized antenna 20.

[0137] In the specific embodiment shown in FIG3 , the connecting arm 112 includes a first connecting section 113, a second connecting section 114, and a snap-fit ​​reducing section 115, which are sequentially connected. The first connecting section 113 and the second connecting section 114 are arranged at an angle. The first connecting section 113 is connected to the vibrator body 111. The snap-fit ​​reducing section 115 is located at the end of the second connecting section 114 away from the first connecting section 113. The snap-fit ​​reducing section 115 snaps into the second mounting hole 22. Arranging the connecting arm 112 such that the first connecting section 113 and the second connecting section 114 are arranged at an angle facilitates the connection between the connecting arm 112 and the vibrator body 111. The width of the snap-fit ​​reducing section 115 at the end closest to the second connecting section 114 is smaller than the width of the second connecting section 114, and the maximum width of the snap-fit ​​reducing section 115 is greater than the diameter of the second mounting hole 22, facilitating the snap-fit ​​reducing section 115 snapping into the second mounting hole 22.

[0138] Optionally, the specific structure of the clamping diameter-reducing section 115 is similar to the structures of the first buckling section 131 and the second buckling section 133 , and will not be described in detail here.

[0139] It should be noted that the specific structure of the connecting arm 112 can be in other forms, as long as the connecting arm 112 can be used to connect the vibrator body 111 to the horizontally polarized antenna 20, and no specific limitation is made here.

[0140] In some embodiments, referring to FIG2 , the vertically polarized antenna 10 further includes a chassis 15 and a plurality of third connecting members 17 , the third connecting member 17 having a plurality of third assembly holes 151 , the plurality of third assembly holes 151 being arranged at intervals around the axial direction of the vertically polarized antenna 10 , the reflective structure 12 further includes an outward-turned connecting edge 124 , the outward-turned connecting edge 124 extending from an end of the annular edge 122 away from the single-arm oscillator 11 in a direction away from the central axis of the reflective structure 12 , the outward-turned connecting edge 124 having a plurality of second assembly holes 125 , the plurality of second assembly holes 125 being arranged at intervals around the axial direction of the reflective structure 12 , and at least a portion of each third connecting member 17 being passed through a second assembly hole 125 and / or a third assembly hole 151 .

[0141] Optionally, the third connecting member 17 can be a double-buckle nylon column, that is, the structure of the third connecting member 17 is similar to that of the first connecting member 13. When the third connecting member 17 is a double-buckle nylon column, at least a portion of each third connecting member 17 is inserted into one of the second assembly holes 125 and one of the third assembly holes 151.

[0142] Alternatively, the third connecting member 17 may be a single-buckle nylon post. Compared to the double-buckle nylon post, the single-buckle nylon post lacks the aforementioned umbrella-shaped structure. In other words, the end of the single-buckle nylon post without the aforementioned umbrella-shaped structure has a threaded hole for engaging a screw to retain the third connecting member 17 within the second assembly hole 125 and the third assembly hole 151. When the third connecting member 17 is a single-buckle nylon post, at least a portion of each third connecting member 17 is inserted into a second assembly hole 125 or a third assembly hole 151.

[0143] The horizontally polarized antenna 20 includes a feed network 23, a dipole 24, a ground layer 25, and a dielectric substrate 26. The feed network 23 and the ground layer 25 are respectively located on opposite sides of the dielectric substrate 26. The dipole 24 can be located on the same side as the feed network 23 or on different sides, without specific limitations here. The mutual coordination of the feed network 23, dipole 24, ground layer 25 and other structures can achieve horizontal polarization. The feed network 23 has multiple feed lines 231, and the multiple feed lines 231 are arranged in a one-to-one correspondence with the multiple dipoles 24 to form a complementary planar dipole circular array. The number of feed lines 231 shown in the figure is 5, but the number of feed lines 231 is not limited to 5 and can also be other numbers. Here, 5 is used as an example for illustration.

[0144] In the specific embodiment shown in Figures 2, 6, and 7, the passive mixing module 30 further includes a PCB board 32, on which the input port 31, the first output port 33, the second output port 34, the frequency selection circuit 40, the combining circuit 50, and the mixing circuit 60 are integrated. The passive mixing module 30 is fixed to the chassis 15 by screws or threaded nylon posts, and the passive mixing module 30 is located between the chassis 15 and the reflective structure 12. To prevent the pads on the passive mixing module 30 from falling off due to stress, wire fixers can be added to appropriate locations on the chassis 15 to protect the solder joints.

[0145] In the specific embodiment shown in FIG7 , the input port 31, the first output port 33, and the second output port 34 are located on different sides of the PCB board 32. The input port 31 is connected to a cable jumper 80 of a predetermined length, the end of which is equipped with an N-type female connector 90. The first output port 33 is connected to the vertically polarized antenna 10 via a connecting wire 150, and the second output port 34 is connected to the horizontally polarized antenna 20 via another connecting wire 150.

[0146] In the specific embodiment shown in FIG7 , the input port 31 , the first output port 33 , and the second output port 34 are respectively located on three different sides of the PCB board 32 . No specific limitation is imposed here, as long as the passive mixing module 30 can stably transmit signals.

[0147] As shown in Figures 11 to 13, the overall dimensions of the omnidirectional indoor antenna are Φ200mm*120mm. Figures 14 to 18 show the antenna simulation results obtained from the omnidirectional indoor antenna structure shown in Figures 11 to 13. It can be seen that the vertically polarized antenna has a voltage standing wave ratio of less than 1.4 and a gain of 4.3dBi in the 2515-2675MHz range. The horizontally polarized antenna has a voltage standing wave ratio of less than 1.3 and a gain of 5.0dBi in the 2515-2675MHz range, with a pattern circularity of ±1.5dB.

[0148] In some embodiments, referring to FIG. 19 to FIG. 21 , the end of the reflective cone 121 in the reflective structure 12 away from the single-arm vibrator 11 is directly connected to the outward-turned connecting edge 124 .

[0149] In this embodiment, the overall dimensions of the omnidirectional indoor antenna remain Φ200mm*120mm. Figures 22 to 26 show that the vertically polarized antenna has a voltage standing wave ratio (VSWR) less than 1.4 and a gain of 3.6dBi in the 2515-2675MHz range. The horizontally polarized antenna has a voltage standing wave ratio (VSWR) less than 1.3, a gain of 4.2dBi in the 2515-2675MHz range, and a pattern circularity of ±1.0dB. Compared to the embodiments shown in Figures 1 to 18, the high-frequency gain of the vertically polarized antenna 10 in this embodiment is reduced by 0.7dB, while the directional circularity of the horizontally polarized antenna 20 is improved but the gain is reduced by 0.8dB. This demonstrates that the high-frequency gain of the vertically polarized antenna 10 can be improved by designing the positional relationship between the reflective cone 121 and the outward-facing connecting edge 124, such as by adding a ring edge 122 between the two, while the gain of the horizontally polarized antenna 20 can be improved to a certain extent by appropriately adjusting the directional circularity of the horizontally polarized antenna 20.

[0150] In some embodiments, referring to FIG. 27 to FIG. 29 , the number of the dipoles 24 and the feed lines 231 in the feeding network 23 is six. The number of the dipoles 24 in this embodiment is different from the number of the dipoles 24 in the embodiment shown in FIG. 1 to FIG. 18 .

[0151] Furthermore, the overall size of the omnidirectional indoor antenna is still Φ200mm*120mm. From Figures 30 to 34, it can be seen that the voltage standing wave ratio of the vertically polarized antenna 10 is less than 1.5, and the gain in the range of 2515-2675MHz is 5.1dBi; the voltage standing wave ratio of the horizontally polarized antenna 20 is less than 1.3, the gain in the range of 2515-2675MHz is 7.1dBi, and the circularity of the radiation pattern is ±1.2dB. Compared with the embodiments shown in Figures 1 to 18, the horizontally polarized antenna 20 of this embodiment adopts a six-element complementary dipole circular array, and at the same time changes the shape and size of the single-arm oscillator 11 and the reflective structure 12 in the vertically polarized antenna 10. The high-frequency gain of the vertically polarized antenna 10 is increased by 0.8dB, and the circularity of the radiation pattern of the horizontally polarized antenna 20 is improved and the gain is increased by 2.1dB. This shows that the original wide beam antenna can be designed into a high gain antenna by simply changing the single-arm oscillator 11, the reflective structure 12 and the horizontally polarized complementary dipole circular array.

[0152] In some embodiments, as shown in FIG. 35 , the input port 31 , the first output port 33 , and the second output port 34 are located on the same side of the PCB board 32 .

[0153] In some embodiments, as shown in FIG36 , the frequency selection circuit 40 includes multiple frequency division sub-circuits, each of which is used to separate signals of different frequency bands. The multiple frequency division sub-circuits are used to divide the input signal into a first signal 100, a second signal 110, a third signal 120, and a fourth signal 130 of different operating frequency bands.

[0154] As shown in FIG36 , the multiple frequency division sub-circuits include a first frequency division sub-circuit 42, a second frequency division sub-circuit 43, and a third frequency division sub-circuit 44. The first frequency division sub-circuit 42 is electrically connected to the input port 31 of the passive mixing module 30 and is configured to separate an input signal inputted from the input port 31 of the passive mixing module 30 into a first signal 100 and a residual signal. The first frequency division sub-circuit 42 performs a primary separation on the input signal to separate the input signal into the first signal 100 and a residual signal, wherein the frequency of the residual signal is lower than the frequency of the first signal 100.

[0155] As shown in FIG36 , the first frequency division subcircuit 42 includes a first duplexer 45, which includes a sixth filter 451 and a seventh filter 452. The output port of the sixth filter 451 is electrically connected to the first input port of the combiner circuit 50 and is configured to filter the input signal to obtain the first signal 100. The output port of the seventh filter 452 is electrically connected to the input port of the second frequency division subcircuit 43 and the input port of the third frequency division subcircuit 44 and is configured to filter the input signal to obtain the residual signal. The sixth filter 451 and the seventh filter 452 operate in different frequency bands. The working principle of the duplexer is to use high-pass filters and low-pass filters to divide different signals according to frequency bands. If the third signal 120 and the fourth signal 130, whose frequency bands are between the first signal 100 and the second signal 110, are to be separated from the input signal, the first signal 100 and the second signal 110 must be separated. Therefore, the first duplexer 45 divides the input signal into the first signal 100 and the residual signal.

[0156] Optionally, the remaining signal includes all signals in the input signal except the first signal 100 .

[0157] Preferably, the remaining signals include a second signal 110 , a third signal 120 and a fourth signal 130 .

[0158] Specifically, the operating frequency band of the sixth filter 451 is greater than the frequency band of the seventh filter 452 .

[0159] In the specific embodiment shown in FIG. 36 , the second frequency dividing sub-circuit 43 is connected to the output port of the first frequency dividing sub-circuit 42 and is configured to receive the remaining signal and separate the second signal 110 and the third signal 120 from the remaining signal.

[0160] As shown in Figure 36, the second frequency division sub-circuit 43 includes a second duplexer 46, and the second duplexer 46 includes an eighth filter 461 and a ninth filter 462. The output port of the eighth filter 461 is electrically connected to the second input port of the combiner circuit 50, and is configured to filter the remaining signal to obtain the second signal 110; the output port of the ninth filter 462 is electrically connected to the first input port of the mixing circuit 60, and is configured to filter the remaining signal to obtain the third signal 120. The operating frequency bands of the eighth filter 461 and the ninth filter 462 are different.

[0161] The second duplexer 46 divides the second signal 110 and the third signal 120 into two signals.

[0162] Optionally, the first duplexer 45 and the second duplexer 46 include LTCC duplexers, wherein the operating frequency bands of the LTCC duplexer in the first duplexer 45 and the LTCC duplexer in the second duplexer 46 are different.

[0163] In the specific embodiment shown in FIG. 36 , the third frequency dividing sub-circuit 44 is connected to the output port of the first frequency dividing sub-circuit 42 and is configured to receive the remaining signal and separate the fourth signal 130 from the remaining signal.

[0164] As shown in Figure 36, the third frequency division sub-circuit 44 includes a matching circuit 441 and a tenth filter 442. The matching circuit 441 is configured to perform impedance matching on the first duplexer 45 and the tenth filter 442 to obtain an impedance matching signal; the output port of the tenth filter 442 is electrically connected to the second input port of the mixing circuit 60, and the tenth filter 442 is configured to filter the impedance matching signal to obtain the fourth signal 130.

[0165] The matching circuit 441 is used to perform impedance matching between the first duplexer 45 and the tenth filter 442 to reduce the insertion loss of the second signal 110 , the third signal 120 and the fourth signal 130 in the remaining signal, while the tenth filter is used to filter the fourth signal 130 .

[0166] Optionally, the tenth filter 442 includes a dielectric filter. Since the fourth signal 130 is close in frequency to the second signal 110 and the third signal 120, dielectric filtering is used to achieve greater out-of-band suppression, thereby ensuring that the insertion loss of other signal channels is not degraded.

[0167] In the specific embodiment shown in Figure 36, the remaining signal output by the first frequency division sub-circuit 42 is divided into two paths, one path is input to the second frequency division sub-circuit 43, and the other path is input to the third frequency division sub-circuit 44, wherein the second frequency division sub-circuit 43 filters the fourth signal 130 in the remaining signal and divides the second signal 110 and the third signal 120 into two paths, and the third frequency division sub-circuit 44 filters the second signal 110 and the third signal 120 to output the fourth signal 130.

[0168] In some embodiments, referring to FIG. 37 , the mixer 61 is a double-balanced mixer. In this embodiment, a non-IQ mixer solution is adopted to eliminate the need for a matching balun in the circuit. Since the matching balun is prone to different degrees of mismatch during actual wiring, which increases the loss, a non-IQ mixer is adopted instead of an IQ mixer to reduce the frequency conversion loss to a certain extent. However, the increased integration of the mixer also brings about a certain increase in cost.

[0169] It should be noted that the selection of the mixer 61 can be made according to specific usage requirements and is not specifically limited here.

[0170] In some embodiments, as shown in FIG38 , the vertically polarized antenna 10 further includes multiple second connectors 14, and the horizontally polarized antenna 20 further includes multiple second mounting holes 22. The multiple second mounting holes 22 are spaced apart axially around the vertically polarized antenna 10, and the second mounting holes 22 are spaced apart from the first mounting hole 21. The connecting arm 112 includes an angled first mounting segment 117 and a second mounting segment 118. The first mounting segment 117 is connected to the oscillator body 111, and the second mounting segment 118 is parallel to the horizontally polarized antenna 20. The second mounting segment 118 has a connecting hole 116. The second connector 14 is inserted into the connecting hole 116 and the second mounting hole 22 to connect the single-arm oscillator 11 to the horizontally polarized antenna 20. In this embodiment, the second mounting segment 118 is in contact with the horizontally polarized antenna 20 and is connected to the horizontally polarized antenna 20 via the second connector 14.

[0171] Optionally, the first mounting section 117 and the vibrator body 111 may be connected by rivets to ensure that the connecting arm 112 and the vibrator body 111 are firmly connected.

[0172] Optionally, the second connecting member 14 is a rivet.

[0173] In some embodiments, referring to FIG. 39 , the single-arm vibrator 11 further includes a circular sleeve 119 . The upper portion of the circular sleeve 119 is connected to the vibrator body 111 , and the lower portion of the circular sleeve 119 is connected to an opening on the dielectric substrate 26 .

[0174] In order to improve the installation stability, rivets can be added to strengthen the fixation based on this embodiment.

[0175] This disclosure utilizes passive frequency conversion technology, leveraging existing DAS systems. This requires only simple modifications at the signal source and endpoint, eliminating the need for outdoor base station construction or indoor wiring modifications. This preserves existing investments in indoor distribution networks and offers a low-cost, innovative solution for addressing 5G indoor coverage. The passive frequency conversion antenna system integrates antenna and frequency conversion, adding a passive mixing module to a traditional ceiling-mounted antenna for high integration. Passive frequency conversion achieves low-loss signal splitting through a combination of multiplexers and filters, resulting in low power consumption and environmental friendliness.

[0176] In some examples, the omnidirectional indoor antenna can be a transceiver antenna, that is, it can both transmit and receive electromagnetic wave signals. Of course, the omnidirectional indoor antenna is not limited to the above structure, but also includes a transceiver unit, a radio frequency transceiver, a signal amplifier, a power amplifier, and a filter unit. The antenna in the communication device can be used as a transmitting antenna or a receiving antenna. Among them, the transceiver unit may include a baseband and a receiving end. The baseband provides a signal of at least one frequency band, such as a 2G signal, a 3G signal, a 4G signal, a 5G signal, etc., and sends a signal of at least one frequency band to the radio frequency transceiver. After the antenna in the communication system receives the signal, it can be processed by the filter unit, the power amplifier, the signal amplifier, and the radio frequency transceiver and then transmitted to the receiving end in the transceiver unit. The receiving end can be, for example, a smart gateway.

[0177] Furthermore, a radio frequency transceiver is connected to the transceiver unit and is used to modulate the signals sent by the transceiver unit or to demodulate the signals received by the antenna and transmit them back to the transceiver unit. Specifically, the radio frequency transceiver may include a transmitting circuit, a receiving circuit, a modulation circuit, and a demodulation circuit. After the transmitting circuit receives various types of signals provided by the baseband, the modulation circuit can modulate these various types of signals provided by the baseband and then transmit them to the antenna. The antenna receives the signal and transmits it to the receiving circuit of the radio frequency transceiver. The receiving circuit transmits the signal to the demodulation circuit, which demodulates the signal and transmits it to the receiving end.

[0178] Furthermore, the RF transceiver is connected to a signal amplifier and a power amplifier, which are then connected to a filtering unit, which is connected to at least one antenna. When the communication system transmits signals, the signal amplifier is used to increase the signal-to-noise ratio of the signal output by the RF transceiver before transmitting it to the filtering unit. The power amplifier is used to amplify the power of the signal output by the RF transceiver before transmitting it to the filtering unit. The filtering unit may specifically include a duplexer and a filtering circuit. The filtering unit combines the signals output by the signal amplifier and the power amplifier, filters out noise, and then transmits them to the antenna, which radiates the signal. When the communication system receives signals, the antenna receives the signal and transmits it to the filtering unit. The filtering unit filters out noise from the signal received by the antenna and transmits it to the signal amplifier and power amplifier. The signal amplifier amplifies the signal received by the antenna to increase the signal-to-noise ratio. The power amplifier amplifies the power of the signal received by the antenna. The signal received by the antenna is processed by the power amplifier and the signal amplifier before being transmitted to the RF transceiver, which then transmits it to the transceiver unit.

[0179] In some examples, the signal amplifier may include various types of signal amplifiers, such as a low noise amplifier, which is not limited herein.

[0180] In some examples, the omnidirectional room antenna provided by the embodiments of the present disclosure further includes a power management unit, which is connected to a power amplifier to provide the power amplifier with a voltage for amplifying the signal.

[0181] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An omnidirectional in-building antenna, wherein, comprising: a vertically polarized antenna, a horizontally polarized antenna, and a passive mixing module, and the passive mixing module includes: a frequency selection circuit, the frequency selection circuit is electrically connected to the input port of the passive mixing module, and is configured to divide the input signal of the input port into a first signal, a second signal, a third signal, and a fourth signal; the minimum frequency of the first signal is greater than the frequency of any one of the second signal, the third signal, and the fourth signal, and the frequency of the second signal is less than the frequency of any one of the third signal and the fourth signal; a combining circuit, the combining circuit is electrically connected to the frequency selection circuit and the vertically polarized antenna, and is configured to combine the first signal and the second signal to generate a combined signal; and output the combined signal to the vertically polarized antenna; a mixing circuit, the mixing circuit is electrically connected to the frequency selection circuit and the horizontally polarized antenna, and is configured to mix the third signal and the fourth signal to generate a mixed signal; and output the mixed signal to the horizontally polarized antenna.

2. The omnidirectional in-building antenna according to claim 1, wherein, the frequency selection circuit has a third output port for outputting the third signal and a fourth output port for outputting the fourth signal; the mixing circuit includes: a mixer, a first input port of the mixer is electrically connected to the third output port of the frequency selection circuit, a second input port of the mixer is electrically connected to the fourth output port of the frequency selection circuit, and the mixer is configured to mix the third signal and the fourth signal to generate an intermediate signal; a first filter, the first filter is electrically connected to the output port of the mixer, and is configured to filter the intermediate signal to generate the mixed signal; and output the mixed signal to the horizontally polarized antenna.

3. The omnidirectional in-building antenna according to claim 2, wherein, the mixer includes one of a double-balanced mixer and a double-balanced IQ mixer.

4. The omnidirectional in-building antenna according to claim 2, wherein, the mixer is a double-balanced IQ mixer, and the mixing circuit further includes: a first matching balun, the first matching balun is connected between the frequency selection circuit and the first input port of the mixer; a second matching balun, the second matching balun is connected between the frequency selection circuit and the second input port of the mixer; a third matching balun, the third matching balun is connected between the output port of the mixer and the first filter.

5. The omnidirectional in-building antenna according to claim 2, wherein, the first filter includes an LTCC filter.

6. The omnidirectional in-building antenna according to claim 2, wherein, the frequency selection circuit includes one of a duplexer and a quadruplexer.

7. The omnidirectional in-building antenna according to claim 2, wherein, the frequency selection circuit includes a quadruplexer, the quadruplexer includes a plurality of filters, the operating frequency bands of the plurality of filters are different from each other, and the plurality of filters include: A second filter, an output port of the second filter is electrically connected to a first input port of the combining circuit, and is configured to filter the input signal to obtain the first signal; A third filter, an output port of the third filter is electrically connected to a second input port of the combining circuit, and is configured to filter the input signal to obtain the second signal; A fourth filter, an output port of the fourth filter is electrically connected to a first input port of the mixing circuit, and is configured to filter the input signal to obtain a third signal; A fifth filter, an output port of the fifth filter is electrically connected to a second input port of the mixing circuit, and is configured to filter the input signal to obtain a fourth signal.

8. The omnidirectional in-building antenna according to claim 7, wherein, a working frequency band of the second filter is greater than a working frequency band of any one of the third filter, the fourth filter, and the fifth filter, and a working frequency band of the third filter is less than a working frequency band of any one of the fourth filter and the fifth filter.

9. The omnidirectional in-building antenna according to claim 8, wherein, working frequency bands of the fourth filter and the fifth filter are both greater than 900 MHz and less than 1800 MHz.

10. The omnidirectional in-building antenna according to claim 1, wherein, the frequency selection circuit includes a plurality of frequency division sub-circuits, and different frequency division sub-circuits are used to separate signals of different frequency bands.

11. The omnidirectional in-building antenna according to claim 10, wherein, the plurality of frequency division sub-circuits include: a first frequency division sub-circuit, the first frequency division sub-circuit is electrically connected to an input port of the passive mixing module, and is configured to separate the input signal into a first signal and a remaining signal; a second frequency division sub-circuit, the second frequency division sub-circuit is connected to an output port of the first frequency division sub-circuit, and is configured to receive the remaining signal, and separate the second signal and the third signal from the remaining signal; a third frequency division sub-circuit, the third frequency division sub-circuit is connected to an output port of the first frequency division sub-circuit, and is configured to receive the remaining signal, and separate the fourth signal from the remaining signal.

12. The omnidirectional in-building antenna according to claim 11, wherein, the first frequency division sub-circuit includes a first duplexer, and the first duplexer includes: a sixth filter, an output port of the sixth filter is electrically connected to a first input port of the combining circuit, and is configured to filter the input signal to obtain the first signal; a seventh filter, an output port of the seventh filter is electrically connected to an input port of the second frequency division sub-circuit and an input port of the third frequency division sub-circuit, and is configured to filter the input signal to obtain the remaining signal, and the sixth filter and the seventh filter have different working frequency bands.

13. The omnidirectional in-building antenna according to claim 11, wherein, the second frequency division sub-circuit includes a second duplexer, and the second duplexer includes: The eighth filter, the output port of the eighth filter is electrically connected to the second input port of the multiplexing circuit, and is configured to filter the remaining signal to obtain the second signal; The ninth filter, the output port of the ninth filter is electrically connected to the first input port of the mixing circuit, and is configured to filter the remaining signal to obtain the third signal. The operating frequency bands of the eighth filter and the ninth filter are different.

14. The omnidirectional indoor distribution antenna according to claim 12, wherein, The third frequency division sub-circuit includes a matching circuit and a tenth filter. The matching circuit is configured to perform impedance matching on the first duplexer and the tenth filter to obtain an impedance matching signal; the output port of the tenth filter is electrically connected to the second input port of the mixing circuit, and the tenth filter is configured to filter the impedance matching signal to obtain the fourth signal.

15. The omnidirectional indoor distribution antenna according to claim 14, wherein, The tenth filter includes a dielectric filter.

16. The omnidirectional indoor distribution antenna according to any one of claims 1 to 15, wherein, The vertical polarization antenna includes: A single-arm oscillator, the single-arm oscillator is conical; A reflection structure, the reflection structure is conical, the small-diameter end of the single-arm oscillator is arranged opposite to the small-diameter end of the reflection structure, the horizontal polarization antenna is located between the single-arm oscillator and the reflection structure, and the reflection structure and the single-arm oscillator are both detachably connected to the horizontal polarization antenna.

17. The omnidirectional indoor distribution antenna according to claim 16, wherein, The reflection structure includes: A reflection cone; An annular edge, the annular edge extends away from the single-arm oscillator from one end of the reflection cone away from the single-arm oscillator.

18. The omnidirectional indoor distribution antenna according to claim 17, wherein, The vertical polarization antenna further includes a plurality of first connecting members. The conical surface of the reflection cone has a plurality of first mounting holes, and the plurality of first mounting holes are arranged at intervals around the axis of the reflection cone. The horizontal polarization antenna has a plurality of first mounting holes, and at least a part of each first connecting member is inserted into one of the first mounting holes and one of the first mounting holes.

19. The omnidirectional indoor distribution antenna according to claim 18, wherein, The single-arm oscillator includes: An oscillator body, the oscillator body is used to transmit or receive signals; A plurality of connecting arms, the first end of the connecting arm is connected to the oscillator body, the second end of the connecting arm is connected to the horizontal polarization antenna, and the plurality of connecting arms are arranged at intervals around the axis of the oscillator body.

20. The omnidirectional indoor distribution antenna according to claim 19, wherein, The horizontal polarization antenna further includes a plurality of second mounting holes, the plurality of second mounting holes are arranged at intervals around the axis of the vertical polarization antenna, the second mounting holes are arranged at intervals from the first mounting holes, and the second end of the connecting arm is inserted into the second mounting holes.

21. The omnidirectional indoor distribution antenna according to claim 20, wherein, ​ The connecting arm includes a first connecting section, a second connecting section and a clamping diameter-changing section which are connected in sequence. The first connecting section and the second connecting section are arranged at an angle. The first connecting section is connected to the oscillator body. The clamping diameter-changing section is located at one end of the second connecting section away from the first connecting section, and the clamping diameter-changing section is clamped in the second mounting hole.

22. The omnidirectional in-building antenna according to claim 19, wherein, the vertical polarization antenna further includes a plurality of second connecting members, the horizontal polarization antenna further includes a plurality of second mounting holes, the plurality of second mounting holes are arranged at intervals around the axis of the vertical polarization antenna, the second mounting holes are arranged at intervals from the first mounting holes, the connecting arm includes an angled first mounting section and a second mounting section, the first mounting section is connected to the oscillator body, the second mounting section is parallel to the horizontal polarization antenna, the second mounting section has a connecting hole, and the second connecting member is inserted through the connecting hole and the second mounting hole to connect the single-arm oscillator to the horizontal polarization antenna.

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