A 5G passive frequency-converting omnidirectional ceiling antenna

Abstract

The present invention relates to the technical field of communication antennas, and discloses a 5G passive frequency conversion omnidirectional ceiling antenna, which consists of a passive frequency conversion module and a passive omnidirectional ceiling antenna. The passive omnidirectional ceiling antenna consists of a horizontally polarized omnidirectional antenna and a vertically polarized omnidirectional antenna. The passive frequency conversion module consists of a PCB board, a duplexer, a triplexer, a D-band 2595 filter, a passive mixer, a limiter, a radio frequency matching circuit, conductive cotton, a passive frequency conversion module shielding cavity, and a passive frequency conversion module bottom cover. The passive omnidirectional ceiling antenna and the passive frequency conversion module adopt an integrated design, which effectively reduces the overall size of the antenna, realizes the transmission of dual-channel signals by a single-channel DAS system, and quickly realizes dual-channel signal coverage and 5G dual-stream experience.

Description

Technical Field

[0001] The present invention relates to the technical field of communication antennas, and in particular to a 5G passive frequency-converting omnidirectional ceiling antenna. Background Art

[0002] With the development of mobile communication technology, there are a large number of single-channel DAS scenarios in the current mobile network. In the 5G era, they will face problems such as low network performance, poor user experience, and limited capacity. Traditional indoor distribution systems are mainly single-channel DAS, and the 5G signal source only has a single-stream 5G experience. The biggest difficulty in transforming the single-channel signal of the existing traditional DAS system into a dual-channel signal is that the intermediate feeder system needs to be redeployed, which is difficult to construct, has a long transformation cycle, and has uncertain performance improvement effects. The research on passive frequency conversion omnidirectional ceiling antenna technology provides important support for the development of 5G communication systems and lays a solid foundation for achieving faster and more stable communication transmission. The rapid development and widespread application of 5G technology have put forward higher requirements for the antenna design of communication systems. 5G passive frequency conversion omnidirectional ceiling antenna technology can achieve omnidirectional coverage, improve the transmission rate and coverage of signals, and thus improve user experience and network performance. With the continuous evolution and application of 5G technology, passive frequency conversion omnidirectional ceiling antenna technology will continue to be deeply studied and promoted. Summary of the invention

[0003] 1. In the 5G era, traditional single-channel DAS scenarios will face problems such as low network performance, poor user experience, and limited capacity. Traditional indoor distributed systems are mainly single-channel DAS, and only a single-stream 5G experience is fed into the 5G signal source. The biggest difficulty in transforming the single-channel signal of the traditional DAS system into a dual-channel signal is that the intermediate feeder system needs to be redeployed, which is difficult to construct, has a long transformation cycle, and uncertain performance improvement effects. The 5G passive frequency conversion antenna solution can quickly achieve dual-channel signal coverage without redeploying the intermediate feeder system. The passive frequency shifting equipment at the source end can provide two signals in different frequency bands. The passive frequency conversion dual-polarization antenna at the antenna end converts the two-channel signals at the source end into dual-channel 2.6GHz signals to achieve the purpose of transmitting dual-channel signals in a single-channel DAS system.

[0004] 2. 5G passive frequency conversion solution, the source end uses 5G frequency shift RRU and replaces the remote indoor antenna at the same time to achieve 5G dual-stream experience. The indoor passive frequency shift MIMO source RRU and passive frequency conversion module are two-in-one, and the remote antenna uses passive frequency conversion to restore the frequency conversion signal. Compared with the traditional single-to-dual solution, there is no need to transform the existing indoor intermediate system, which effectively improves the delivery progress, reduces the construction difficulty, and shortens the construction period; compared with the industry's active frequency shift MIMO solution, there is no need to add active frequency shift equipment on the source and antenna side, which is green and environmentally friendly.

[0005] 3. This solution will not make large-scale changes to the original antenna and feeder system. Instead, by adding 5G signal sources (BBU and frequency-shift integrated RRU), replacing passive frequency-converting antennas and combiners, and using the original antenna and feeder system, the 5G indoor network can be quickly opened, thereby reducing engineering costs and difficulty, improving the overall performance of the indoor network, and accelerating the deployment of operators' 5G indoor networks.

[0006] 4. 5G passive frequency conversion omnidirectional ceiling antenna technology plays an important role in solving some key technical problems, mainly including the following aspects:

[0007] Omnidirectional coverage: Passive frequency-converting omnidirectional ceiling antenna can achieve omnidirectional coverage without adjusting the antenna direction, thereby improving the signal coverage range and transmission rate.

[0008] Frequency adaptation: 5G communication systems need to support higher frequencies and larger bandwidths, and the frequency adaptation of antennas has become a key issue. Passive frequency-converting omnidirectional ceiling antennas improve the frequency response and radiation efficiency of antennas by optimizing antenna structure and materials, achieving better frequency adaptability.

[0009] System integration: The integration of the omnidirectional ceiling antenna and the passive frequency conversion module effectively reduces the overall size of the antenna, while achieving higher transmission rates and more stable signal coverage.

[0010] Multi-user support: 5G passive frequency-converting omnidirectional ceiling antenna can achieve better multi-user support and improve the capacity and efficiency of the system.

[0011] The 5G passive frequency-converting omnidirectional ceiling antenna provides important support for the development of 5G communication systems and promotes the rapid development and widespread application of 5G technology.

[0012] To achieve the above object, the present invention provides the following technical solutions:

[0013] 5G passive frequency conversion is an indoor coverage solution that down-converts the RF signal fed by a single-channel DAS to the intermediate frequency band, transmits the intermediate frequency signal through the indoor passive distribution system, and then up-converts it to the RF signal after reaching the distributed antenna head end. The antenna up-conversion circuit is implemented in a passive way. Through this system, multi-channel signals can be transmitted in a single-channel DAS distribution system to achieve MIMO effect.

[0014] The current indoor passive distribution system supports 2.6GHz frequency band signal transmission. In order to realize the transmission of dual-channel signals by a single-channel DAS distribution system, the source end needs to maintain one of the 2.6GHz frequency band signals unchanged, down-convert the other 2.6GHz frequency band signal to the intermediate frequency band, and then combine it with other frequency bands and feed it into the indoor passive distribution system.

[0015] As an independent component, the 5G passive frequency-converting antenna has a single-port RF feed. The antenna supports China Mobile's 900MHz frequency band (core frequency band 889MHz~949MHz), 1800MHz frequency band (core frequency band 1710~1830MHz), E band (core frequency band 2300MHz~2390MHz), and D band (core frequency band 2515MHz~2675MHz). The D band is a variable frequency band (bandwidth 160M), and the local oscillator frequency (single tone signal). The variable frequency band and local oscillator frequency are consistent with the requirements of China Mobile's main equipment centralized procurement equipment, and the variable frequency and local oscillator frequency do not overlap with the frequency used by the operator.

[0016] 5G passive frequency conversion technology provides important support for the development of 5G communication systems and promotes the rapid popularization and application of 5G technology. 5G passive frequency conversion module has the following technical features:

[0017] High frequency support: 5G communication systems need to support higher frequencies and larger bandwidths. Passive frequency conversion modules have the ability to support high frequencies and can achieve high-speed data transmission and low-latency communication.

[0018] Broadband support: The passive frequency conversion module supports the transmission of broadband signals, can adapt to the complex signal modulation and demodulation requirements in 5G communication systems, and achieve efficient data transmission and communication connections.

[0019] High performance: The passive frequency conversion module has high performance characteristics, including high sensitivity, low noise, high dynamic range, etc., to ensure stable transmission and reception of signals and improve the performance and reliability of the communication system.

[0020] Miniaturization and integration: With the trend of miniaturization and integration of communication equipment, passive frequency conversion modules have the characteristics of small size, light weight and high integration, which can be flexibly applied in various devices and systems.

[0021] Energy saving and high efficiency: The passive frequency conversion module has the characteristics of energy saving and high efficiency, which can effectively reduce power consumption, extend the use time of equipment, and improve the energy utilization efficiency of the system.

[0022] Reliable and stable: The passive frequency conversion module has reliable and stable characteristics, and can maintain good working performance under various environmental conditions, ensuring the stable operation of the communication system and the reliability of data transmission.

[0023] Effectively reduce the development cost of 5G passive frequency-converting omnidirectional ceiling antenna, improve product reliability, and reduce product maintenance frequency and maintenance costs. The 5G passive frequency-converting omnidirectional ceiling antenna is designed and developed according to the principles of universalization, modularization, and combination, with a high level of standardization and good maintainability.

[0024] Table 1 Performance requirements of 5G passive frequency conversion modules

[0025]

[0026] As shown in Table 1, the relevant technical requirements and performance indicators of the 5G passive frequency conversion module. According to the functional requirements, the working principle block diagram of the 5G passive frequency mixing module is as follows: Figure 2 shown.

[0027] The passive frequency conversion module circuit simulation schematic diagram is as follows Figure 3 According to the working principle of the passive frequency conversion module and the circuit simulation schematic diagram, the layout design of the RF circuit of the passive frequency conversion module PCB circuit board is carried out. The 5G passive frequency conversion module PCB layout design diagram is shown in Figure 4 shown.

[0028] Duplexer 1# 612 and duplexer 2# 613 have the same specifications and models, both adopt LTCC structure, low-pass frequency band is 880-1530MHz, high-pass frequency band is 1710-2700MHz, the simulation results are as follows Figure 5 As shown, the insertion loss in the 880-960MHz band is ≤0.85dB, the insertion loss in the 1450±80MHz band is ≤1.6dB, the insertion loss in the 1710-1830MHz band is ≤1.6dB, the insertion loss in the 2300-2390MHz band is ≤1.2dB, and the insertion loss in the 2515-2675MHz band is ≤1.0dB.

[0029] The triplexer 614 adopts ceramic dielectric form and is composed of three specifications of ceramic dielectric filters cascaded, 920MHz filter, 1145MHz filter, and 1450MHz filter. The 920MHz filter and 1145MHz filter are integrated. The performance simulation results of the triplexer 614 are as follows: Figure 6 As shown, the insertion loss in the 880-960MHz band is ≤1.5 dB, and the insertion loss in the 1450±80MHz band is ≤1dB.

[0030] The 2.6GHz D-band (2515~2675MHz) filter adopts a ceramic dielectric structure. The performance test results of the D-band 2595 filter 617 are as follows: Figure 7 As shown, the insertion loss in the passband is less than 1.8dB, and the return loss in the passband is less than -17dB.

[0031] The conversion loss of the selected passive mixer 615 is shown as Figure 8 As shown, the conversion loss within the working frequency band is less than 8dB.

[0032] Combined with the simulation and measured results of each link component (duplexer 1# 612, duplexer 1# 613, triplexer 614, D-band 2595 filter 617, passive mixer 615), the link loss of each frequency band of the passive frequency conversion module is shown in Table 2. The loss of the frequency conversion band (1450±80 / 2595±80) is 12.4dB, which is less than 13dB and meets the design index requirements.

[0033] Table 2 Link loss of each frequency band of passive frequency conversion module

[0034] Frequency band (MHz) Duplexer loss (dB) Triplexer 614 loss (dB) Filter loss (dB) Mixer loss (dB) Total loss (dB) 880-940 0.85*2 1.5 / / 3.2 1710-1830 1.6*2 / / / 3.2 2300-2390 1.2*2 2.4 Non-shifted band 2515-2675 1.0*2 / / / 2.0 Frequency conversion range: 1450±80 / 2595±80 1.6 1 1.8 8 12.4

[0035] According to the relevant design scheme, simulation design verification results and electronic component specifications, the overall structure design of the 5G passive frequency conversion module is as follows: Figure 1 As shown; the passive frequency conversion module includes a passive frequency conversion module PCB board 611, a duplexer 1# 612, a duplexer 2# 613, a triplexer 614, a passive mixer 615, a limiter module 616, a D-band 2595 filter 617, a radio frequency matching circuit 618, a passive frequency conversion module grounding conductive cotton 619, a passive frequency conversion module shielding cavity 620, and a passive frequency conversion module bottom cover 621;

[0036] The block diagram of the 5G passive frequency conversion omnidirectional ceiling antenna is as follows: Fig. 9 As shown, in order to realize the transmission of dual-channel signals by a single-channel DAS distribution system, one non-frequency-shifted frequency band signal remains unchanged, and the other 2.6GHz frequency band signal is down-converted to the intermediate frequency band, and then combined with other frequency bands and fed into the indoor passive distribution system.

[0037] 5G passive frequency conversion omnidirectional ceiling antenna structure design Fig.10 As shown, 1 is the antenna cover, 2 is the vertically polarized disc-cone antenna vibrator, 3 is the horizontally polarized omnidirectional antenna, 4 is the nylon support of the horizontally polarized omnidirectional antenna, 5 is the disc-cone antenna base, 6 is the passive frequency conversion module, and 7 is the base.

[0038] 5G passive frequency conversion omnidirectional ceiling antenna overall structure design Fig.11 As shown, the 5G passive frequency conversion omnidirectional ceiling antenna consists of an antenna cover 1, a non-frequency shifting vibrator 2, a frequency shifting vibrator 3, a frequency shifting vibrator mounting support 4, a non-frequency shifting vibrator lower cone 5, a passive frequency conversion module 6, a plastic support base plate 7, a plastic support pad 8, a mounting assembly 9, and a connector assembly 10, wherein the passive frequency conversion module 6 includes a passive frequency conversion module PCB board 611, a duplexer 1# 612, a duplexer 2# 613, a triplexer 614, a passive mixer 615, a limiter 616, a D-band 2595 filter 617, a radio frequency matching circuit 618, a passive frequency conversion module grounding conductive cotton 619, a passive frequency conversion module shielding cavity 620, and a passive frequency conversion module bottom cover 621.

[0039] Compared with the prior art, the present invention provides a 5G passive frequency-converting omnidirectional ceiling antenna, which has the following beneficial effects:

[0040] 1. The biggest difficulty in transforming the single-channel signal of the traditional DAS system into a dual-channel signal is that the intermediate feeder system needs to be redeployed, which is difficult to construct, has a long transformation period, and has uncertain performance improvement effects. The 5G passive frequency conversion antenna solution can quickly achieve dual-channel signal coverage without redeploying the intermediate feeder system. The passive frequency shifting equipment at the source end can provide two signals of different frequency bands. The passive frequency conversion dual-polarization antenna at the antenna end converts the two-channel signals at the source end into dual-channel 2.6GHz signals, so that the single-channel DAS system can transmit dual-channel signals.

[0041] 2. 5G passive frequency conversion solution: the signal source end uses 5G frequency shifting RRU and replaces the remote indoor antenna at the same time to achieve 5G dual-stream experience.

[0042] 3. The indoor passive frequency-shift MIMO signal source RRU and the passive frequency conversion module are two-in-one. The remote antenna uses passive frequency conversion to restore the frequency conversion signal. Compared with the traditional single-to-dual solution, there is no need to transform the existing indoor intermediate system, which effectively improves the delivery progress, reduces the construction difficulty, and shortens the construction period. Compared with the industry's active frequency-shift MIMO solution, there is no need to add active frequency-shift equipment on the signal source and antenna side, which is green and environmentally friendly.

[0043] 3. This solution will not make large-scale changes to the original antenna and feeder system. By adding 5G signal sources (BBU and frequency-shift integrated RRU), replacing passive frequency-converting antennas and combiners, and using the original antenna and feeder system, the 5G indoor network can be quickly opened, thereby reducing engineering costs and difficulty, improving the overall performance of the indoor network, and accelerating the deployment of operators' 5G indoor networks.

[0044] 4. 5G passive frequency conversion omnidirectional ceiling antenna technology plays an important role in solving some key technical problems, mainly including the following aspects:

[0045] Omnidirectional coverage: Passive frequency-converting omnidirectional ceiling antenna can achieve omnidirectional coverage without adjusting the antenna direction, thereby improving the signal coverage range and transmission rate.

[0046] Frequency adaptation: 5G communication systems need to support higher frequencies and larger bandwidths, and the frequency adaptation of antennas has become a key issue. Passive frequency-converting omnidirectional ceiling antennas improve the frequency response and radiation efficiency of antennas by optimizing antenna structure and materials, achieving better frequency adaptability.

[0047] System integration: The integration of the omnidirectional ceiling antenna and the passive frequency conversion module effectively reduces the overall size of the antenna, while achieving higher transmission rates and more stable signal coverage.

[0048] Multi-user support: 5G passive frequency-converting omnidirectional ceiling antenna can achieve better multi-user support and improve the capacity and efficiency of the system.

[0049] The 5G passive frequency-converting omnidirectional ceiling antenna provides important support for the development of 5G communication systems and promotes the rapid development and widespread application of 5G technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the structure of a 5G passive frequency conversion module proposed by the present invention;

[0051] Figure 2 This is a block diagram of the working principle of a 5G passive frequency conversion module proposed by the present invention;

[0052] Figure 3 This is a circuit simulation schematic diagram of a 5G passive frequency conversion module proposed by the present invention;

[0053] Figure 4 A PCB layout design diagram of a 5G passive frequency conversion module proposed by the present invention;

[0054] Figure 5 This is a performance simulation result diagram of a 5G passive frequency conversion module link duplexer proposed in the present invention;

[0055] Figure 6 This is a performance simulation result diagram of a 5G passive frequency conversion module link triplexer proposed in the present invention;

[0056] Figure 7 This is a performance test result diagram of a 5G passive frequency conversion module link D-band 2595 filter proposed by the present invention;

[0057] Figure 8 This is a graph showing the conversion loss results of a passive mixer in a 5G passive frequency conversion module link proposed by the present invention;

[0058] Fig. 9 This is a schematic diagram of a 5G passive frequency-converting omnidirectional ceiling antenna proposed by the present invention;

[0059] Fig.10 A schematic diagram of the structural design of a 5G passive frequency-converting omnidirectional ceiling antenna proposed in the present invention;

[0060] Fig.11 This is a schematic diagram of the overall structure of a 5G passive frequency-converting omnidirectional ceiling antenna proposed in the present invention.

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0062] The input port connector is connected to the main feeder input signal, output port 1 is connected to the vertical polarization oscillator of the antenna, output port 2 is connected to the horizontal polarization oscillator of the antenna, the frequency shift module is integrated with the antenna radiation oscillator, and the full-band 889-949MHz, frequency conversion 1450±80MHz, local oscillator 1145MHz, 1710-1830MHz, 2300-2390MHz, 2515-2675MHz signals are input. One channel is connected to the vertical polarization oscillator to output 889-949MHz, 1710-1830MHz, 2300-2390MHz, 2515-2675MHz signals, and one channel is connected to the horizontal polarization oscillator to output 2515-2675MHz signals, so as to achieve MIMO coverage effect in the 2515-2675MHz frequency band. After the input signal enters the duplexer 1# 612, the duplexer 1# 612 outputs the 1710-2700MHz signal to the duplexer 2# 613, outputs the 880-1530MHz signal to the triplexer 614, the triplexer 614 outputs the 889-949MHz signal to the duplexer 2# 613, outputs the local oscillator 1145MHz signal to the passive mixer 615, and also outputs the frequency conversion 1450±80MHz signal to the passive mixer 615, the duplexer 2# 613 outputs 889-949MHz, 1710-1830MHz, 2300-2390MHz, and 2515-2675MHz signals to the vertically polarized antenna, and the passive mixer 615 mixes the frequency-converted 1450±80MHz signal with the local oscillator 1145MHz signal and outputs the mixed signal to the D-band 2595 filter 617, and the D-band 2595 filter 617 outputs 2515-2675MHz signal to the horizontally polarized antenna, thereby realizing the transmission of dual-channel signals from a single-channel DAS system and achieving MIMO effect.

[0063] like Figure 1 As shown, a schematic diagram of the structure of a 5G passive frequency conversion module proposed in this patent, the passive frequency conversion module includes a passive frequency conversion module PCB board 611, a duplexer 1# 612, a duplexer 2# 613, a triplexer 614, a passive mixer 615, a limiter module 616, a D-band 2595 filter 617, a radio frequency matching circuit 618, a passive frequency conversion module grounding conductive cotton 619, a passive frequency conversion module shielding cavity 620, and a passive frequency conversion module bottom cover 621;

[0064] Duplexer 1# 612 and duplexer 2# 613 both adopt LTCC structure (low-pass frequency band: 880-1530MHz, high-pass frequency band: 1710-2700MHz), and triplexer 614 adopts ceramic dielectric structure. Triplexer 614 is composed of three types of ceramic dielectric filters cascaded, 920MHz filter, 1145MHz filter, 1450MHz filter, of which 920MHz filter and 1145MHz filter are integrated);

[0065] The passive mixer 615 adopts a low-loss high-linearity mixer, the limiter module 616 is composed of eight limiters in cascade, and the D-band 2595 filter 617 adopts a ceramic dielectric form, and the operating frequency band is 2515~2675MHz;

[0066] Duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, D-band 2595 filter 617, and radio frequency matching circuit 618 are integrated on the passive frequency conversion module PCB board 611. The related components are soldered together with the passive frequency conversion module PCB board 611 by SMT patch process. The radio frequency matching circuit 618 is composed of capacitors and winding inductors.

[0067] The passive frequency conversion module PCB board 611 adopts a double-sided copper clad board, and the duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, D-band 2595 filter 617, and radio frequency matching circuit 618 related components are respectively arranged on the front side of the passive frequency conversion module PCB board 611; 1# and 2# feeding connection cables and the grounding surface of the passive frequency conversion module PCB board 611, and the connector cable pads are arranged on the back side of the grounding surface of the passive frequency conversion module PCB board 611.

[0068] The passive frequency conversion module shielding cavity 620 is formed by integrated casting and is designed with threaded holes for installation and fixing. Structural avoidance design is performed at the positions corresponding to duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, and D-band 2595 filter 617. At the same time, a shielding groove is designed corresponding to the RF circuit module. Glue is dispensed on the metal contour of the passive frequency conversion module shielding cavity 620 to play a signal shielding role for the module RF circuit. The passive frequency conversion module shielding cavity 620 is installed and fixed to the IN port end of the passive frequency conversion module PCB board 611, and is fastened and assembled from the bottom cover plate 621 side of the passive frequency conversion module by metal screws.

[0069] Conductive cotton 619 is pasted on the positions of the passive frequency conversion module shielding cavity 620 corresponding to the triplexer 614 and the D-band 2595 filter 617. Placing the conductive cotton above the dielectric filter can achieve electromagnetic shielding and physical protection functions, thereby improving the overall performance and reliability of the equipment.

[0070] The passive frequency conversion module bottom cover 621 is processed by sheet metal stamping, and fixed installation holes are set on both sides and the middle position. The passive frequency conversion module bottom cover 621 is fixed to the passive frequency conversion module shielding cavity 620 by metal screws, and an avoidance hole is opened at the passive frequency conversion module PCB board 611 corresponding to the screw installation position; the passive frequency conversion module PCB board 611 is fixed to the passive frequency conversion module bottom cover 621 by 4 plastic rivets; the passive frequency conversion module bottom cover 621 is placed on the passive frequency conversion module PCB board 611 grounding surface, and the passive frequency conversion module bottom cover 621 is designed with a notch design at the welding position corresponding to the 1# feeder cable and the 2# feeder cable;

[0071] like Fig.11 As shown, the present invention proposes a 5G passive frequency conversion omnidirectional ceiling antenna solution structural schematic diagram, the passive frequency conversion omnidirectional ceiling antenna includes a radome 1, a non-frequency shifting vibrator 2, a frequency shifting vibrator 3, a frequency shifting vibrator mounting support 4, a non-frequency shifting vibrator lower cone 5, a passive frequency conversion module 6, a plastic support base plate 7, a plastic support pad 8, a mounting assembly 9, and a connector assembly 10. The passive frequency conversion module 6 includes a passive frequency conversion module PCB integrated circuit board assembly 622, a passive frequency conversion module grounding conductive cotton 619, a passive frequency conversion module shielding cavity 620, and a passive frequency conversion module bottom cover 621, wherein the passive frequency conversion module PCB integrated circuit board assembly 622 is composed of a passive frequency conversion module PCB board 611, a duplexer 1# 612, a duplexer 2# 613, a triplexer 614, a passive mixer 615, a limiter 616, a D-band 2595 filter 617, and a radio frequency matching circuit 618.

[0072] As an independent component, the 5G passive omnidirectional ceiling antenna has a single-port RF feed and adopts an integrated design of a single-polarized omnidirectional ceiling antenna and a passive frequency conversion module;

[0073] The frequency shifting vibrator 3 is assembled to the non-frequency shifting lower cone through three frequency shifting vibrator mounting pillars 4; the frequency shifting vibrator 3 is inserted into the medium through the core wire of the 1# feeding cable for welding and then connected to the non-frequency shifting vibrator lower cone 5 through a copper nut; the non-frequency shifting vibrator 2 and the frequency shifting vibrator 3 are connected to the antenna branch 1# interface and branch 2# interface corresponding to the passive frequency conversion module PCB board 611 through the 1# and 2# feeding cables respectively;

[0074] The passive frequency conversion module 6 is mounted on the plastic support base plate 7 by screws at the fixed mounting holes on both sides and in the middle of the passive frequency conversion module bottom cover plate 621; the passive frequency conversion module bottom cover plate 621 and the passive frequency conversion module PCB integrated circuit board assembly 622 are fixed together by rivets, and then the assembled assembly is placed and installed on the back of the plastic support base plate 7, and fixed to the passive frequency conversion module shielding cavity 620 by metal screws, and the plastic support base plate 7 is synchronously notched at the notch position corresponding to the passive frequency conversion module bottom cover plate 621 to ensure cable welding;

[0075] The plastic support pad 8 is installed to the back of the plastic support base plate 7 by screws, flush with the passive frequency conversion module shielding cavity 620; the plastic nut in the installation component 9 is screwed into the installation screw and fastened to contact with the plastic support pad 8, and then the N-type connector component is inserted into the installation component 9, and the cable end of the connector component 10 is welded to the IN port of the passive frequency conversion module PCB board 611;

[0076] The antenna is placed inside the antenna cover 1, and the antenna cover 1 is fixed to the plastic support base plate 7 by using metal self-tapping screws.

[0077] In summary, the 5G passive frequency-shifting omnidirectional ceiling antenna meets the requirements of China Mobile's mainstream operators. This solution can quickly achieve dual-channel signal coverage. The passive frequency-shifting equipment at the source end can provide two signals of different frequency bands. The passive frequency-shifting dual-polarized antenna at the antenna end converts the two signals at the source end into dual 2.6GHz signals to achieve dual-channel signal transmission by a single-channel DAS system. The source end uses a 5G frequency-shifting RRU and replaces the remote indoor antenna at the same time to achieve a 5G dual-stream experience. The indoor passive frequency-shifting MIMO source RRU and the passive frequency-shifting module are two-in-one. The remote antenna uses passive frequency-shifting to restore the frequency-shifting signal. There is no need to transform the existing indoor intermediate system, which effectively improves the delivery progress, reduces the construction difficulty, and shortens the construction period. Compared with the industry's active frequency-shifting MIMO solution, there is no need to add active frequency-shifting equipment on the source and antenna sides, which is green and environmentally friendly.

[0078] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 5G passive frequency conversion omnidirectional ceiling antenna, comprising a radome 1, a non-frequency shifting vibrator 2, a frequency shifting vibrator 3, a frequency shifting vibrator mounting pillar 4, a non-frequency shifting vibrator lower cone 5, a passive frequency conversion module 6, a plastic support base plate 7, a plastic support pad 8, a mounting assembly 9, and a connector assembly 10, wherein the passive frequency conversion module 6 comprises a passive frequency conversion module PCB board 611, a duplexer 1# 612, a duplexer 2# 613, a triplexer 614, a passive mixer 615, a limiter 616, a D-band 2595 filter 617, a radio frequency matching circuit 618, a passive frequency conversion module grounding conductive cotton 619, a passive frequency conversion module shielding cavity 620, and a passive frequency conversion module bottom cover 621; The input port connector is connected to the main feeder input signal, output port 1 is connected to the vertical polarization oscillator of the antenna, output port 2 is connected to the horizontal polarization oscillator of the antenna, the frequency shift module is integrated with the antenna radiation oscillator, and the full-band 889-949MHz, frequency conversion 1450±80MHz, local oscillator 1145MHz, 1710-1830MHz, 2300-2390MHz, 2515-2675MHz signals are input. One channel is connected to the vertical polarization oscillator to output 889-949MHz, 1710-1830MHz, 2300-2390MHz, 2515-2675MHz signals, and one channel is connected to the horizontal polarization oscillator to output 2515-2675MHz signals, so as to achieve MIMO coverage effect in the 2515-2675MHz frequency band. After the input signal enters the duplexer 1# 612, the duplexer 1# 612 outputs the 1710-2700MHz signal to the duplexer 2# 613, outputs the 880-1530MHz signal to the triplexer 614, the triplexer 614 outputs the 889-949MHz signal to the duplexer 2# 613, outputs the local oscillator 1145MHz signal to the passive mixer, and also outputs the frequency-converted 1450±80MHz signal to the passive mixer 615, the duplexer 2# 613 outputs the 889-949MHz, 1710-1830MHz, 2300-2390MHz, 2515-2675MHz signals to the vertically polarized antenna, the passive mixer 615 mixes the frequency-converted 1450±80MHz signal with the local oscillator 1145MHz signal and outputs them to the D-band 2595 filter 617, the D-band 2595 filter 617 outputs the 2515-2675MHz signal to the horizontally polarized antenna, thereby realizing the transmission of dual-channel signals from a single-channel DAS system and achieving the MIMO effect.

2. A 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: Duplexer 1# 612 and duplexer 2# 613 both adopt LTCC structure, and triplexer 614 adopts ceramic dielectric structure. Triplexer 614 is composed of three specifications of ceramic dielectric filters cascaded, 920MHz filter, 1145MHz filter, 1450MHz filter, and the 920MHz filter and 1145MHz filter are integrated into one design.

3. A 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The limiter module 616 is composed of eight limiters in cascade, and the D-band 2595 filter 617 is in the form of ceramic dielectric, and the operating frequency band is 2515~2675MHz.

4. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: Duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, D-band 2595 filter 617, and RF matching circuit 618 are integrated on the passive frequency conversion module PCB board 611 and soldered using the SMT patch process, wherein the RF matching circuit 618 is composed of capacitors and winding inductors.

5. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The passive frequency conversion module PCB board 611 adopts a double-sided copper clad board, and the duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, D-band 2595 filter 617, and RF matching circuit 618 related components are respectively arranged on the back side of the passive frequency conversion module PCB board 611 ground plane.

6. A 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The passive frequency conversion module shielding cavity 620 is formed by integrated casting and is designed with installation and fixing threaded holes. Structural avoidance design is performed at the positions corresponding to duplexer 1# 612, duplexer 2# 613, triplexer 614, passive mixer 615, limiter module 616, and D-band 2595 filter 617; the passive frequency conversion module PCB board 611 is installed and fixed to the passive frequency conversion module shielding cavity 620, and is fastened and assembled from the side of the bottom cover plate 621 of the passive frequency conversion module by metal screws.

7. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: Conductive cotton 619 is pasted above the triplexer 614 and the D-band 2595 filter 617, and the foam is placed above the dielectric filter to achieve electromagnetic shielding and physical protection functions, thereby improving the overall performance and reliability of the device.

8. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The passive frequency conversion module bottom cover 621 is processed by sheet metal stamping, with fixed installation holes set on both sides and the middle position. The passive frequency conversion module bottom cover 621 is fixed to the passive frequency conversion module shielding cavity 620 by metal screws, and an avoidance hole is opened at the passive frequency conversion module PCB board 611 corresponding to the screw installation position; the passive frequency conversion module PCB board 611 is fixed to the passive frequency conversion module bottom cover 621 by 4 plastic rivets; the passive frequency conversion module bottom cover 621 is placed on the passive frequency conversion module PCB board 611 grounding surface, and the passive frequency conversion module bottom cover 621 is designed with a notch at the corresponding feeding cable welding position.

9. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: As an independent component, the 5G passive omnidirectional ceiling antenna has a single-port RF feed and adopts an integrated design of a single-polarization omnidirectional ceiling antenna and a passive frequency conversion module.

10. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The frequency-shifting vibrator 3 is assembled to the non-frequency-shifting lower cone through three frequency-shifting vibrator mounting pillars 4; the frequency-shifting vibrator 3 is connected to the non-frequency-shifting vibrator lower cone 5 through the core wire of the 1# feeding cable inserted into the medium for welding and then connected to the non-frequency-shifting vibrator through a copper nut; the non-frequency-shifting vibrator 2 and the frequency-shifting vibrator 3 are connected to the antenna branch ANT1 interface and the branch ANT2 interface corresponding to the passive frequency conversion module PCB board 611 through the 1# and 2# feeding cables respectively.

11. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The passive frequency conversion module 6 is installed on the plastic support base plate 7 by using screws at the fixed installation holes on both sides and in the middle of the bottom cover plate 621 of the passive frequency conversion module; the bottom cover plate 621 of the passive frequency conversion module and the passive frequency conversion module PCB integrated circuit board assembly 622 are fixed together by rivets, and then the assembled assembly is placed and installed on the back of the plastic support base plate 7, and fixed to the passive frequency conversion module shielding cavity 620 by metal screws; and the plastic support base plate 7 is synchronously notched at the notch position corresponding to the bottom cover plate 621 of the passive frequency conversion module to ensure cable welding.

12. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The plastic support pad 8 is installed to the back of the plastic support base plate 7 by screws, flush with the passive frequency conversion module shielding cavity 620; the plastic nut in the installation component 9 is screwed into the installation screw and fastened to contact the plastic support pad 8, and then the N-type connector component is inserted into the installation component 9, and the cable end of the connector component 10 is welded to the IN port of the passive frequency conversion module PCB board 611.

13. The 5G passive frequency-converting omnidirectional ceiling antenna according to claim 1, characterized in that: The antenna is placed inside the antenna cover 1, and the antenna cover 1 is fixed to the plastic support base plate 7 by using metal self-tapping screws.

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