WO2024067497A1

WO2024067497A1 - Miniaturized ultra-wideband antenna system

Info

Publication number: WO2024067497A1
Application number: PCT/CN2023/121143
Authority: WO
Inventors: 刘蒋军; 姚丹
Original assignee: 上海移远通信技术股份有限公司
Priority date: 2022-09-29
Filing date: 2023-09-25
Publication date: 2024-04-04
Also published as: CN218005247U

Abstract

Provided in the present application is a miniaturized ultra-wideband antenna system, which comprises an antenna assembly, wherein the antenna assembly comprises a first radiator and a second radiator. The first radiator is used for sending signals of at least two frequency bands, and the second radiator is used for sending signals of at least one frequency band, wherein the frequency band corresponding to the signals of the at least two frequency bands that are sent by the first radiator does not overlap with the frequency band corresponding to the signals of the at least one frequency band that are sent by the second radiator. Compared with existing single-frequency or double-frequency WiFi antennas, the multi-frequency WiFi antenna provided in the embodiments of the present application has the advantages of expanding the bandwidth of the WiFi antenna, solving the problem of frequency band congestion, and reducing interference between antennas.

Description

Miniaturized Ultra-Wideband Antenna System

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application number "202222624252.4" filed on September 29, 2022, with application name "Miniaturized Ultra-Wideband Antenna System", and the entire contents of which are incorporated by reference into this application.

Technical Field

The embodiments of the present application relate to the field of wireless communication technology, and in particular to a miniaturized ultra-wideband antenna system.

Background technique

In recent years, wireless communication has developed rapidly. As an important device for transmitting and receiving electromagnetic waves in wireless communication systems, the performance of antennas is crucial to the communication quality of the entire communication system. Technologies such as miniaturization and multi-band antennas have become hot topics in research.

Most existing WiFi antennas are 2.4GHZ single-band antennas, or 2.4GHZ&5GHZ dual-band antennas.

However, the bandwidth of 2.4GHZ signal is relatively narrow. Most home appliances and wireless devices use the 2.4GHZ frequency band. The wireless environment is crowded and the interference is relatively large. The frequency of 5GHZ signal is relatively high. When it propagates in the air or obstacles, it attenuates greatly and has a shorter coverage distance. Therefore, the traditional 2.4GHZ single-frequency antenna or 2.4GHZ&5GHZ dual-frequency antenna cannot meet the needs of users.

Summary of the invention

The embodiment of the present application provides a miniaturized ultra-wideband antenna system, which can realize a multi-frequency WIFI antenna, expand the working bandwidth of the WIFI antenna, solve the problem of frequency band congestion, and reduce interference between antennas.

The embodiment of the present application provides a miniaturized ultra-wideband antenna system, including: an antenna assembly, the antenna assembly including a first radiator and a second radiator;

A first radiator, used to send signals in at least two frequency bands;

A second radiator, used to send a signal of at least one frequency band;

The frequency bands corresponding to the signals of at least two frequency bands sent by the first radiator and the frequency bands corresponding to the signal of at least one frequency band sent by the second radiator do not overlap.

In summary, through the technical solution provided by this application, the first radiator is used to send at least two The second radiator is used to send signals of at least one frequency band; and the frequency bands corresponding to the signals of at least two frequency bands sent by the first radiator and the signals of at least one frequency band sent by the second radiator do not overlap. Compared with the existing single-frequency or dual-frequency WIFI antenna, the embodiment of the present application proposes a multi-frequency WIFI antenna, which expands the bandwidth of the WIFI antenna, solves the problem of frequency band congestion, and reduces interference between antennas.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic structural diagram of a miniaturized ultra-wideband antenna system provided in an embodiment of the present application;

FIG2 is a schematic structural diagram of a miniaturized ultra-wideband antenna provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of an antenna test board provided in an embodiment of the present application;

FIG4 is a schematic diagram of installing an antenna on a test board provided in an embodiment of the present application;

FIG5 is a simulation schematic diagram of an antenna provided in an embodiment of the present application;

FIG6 is a schematic diagram showing a comparison of the simulation and actual standing wave ratios provided in an embodiment of the present application;

FIG. 7 is a schematic diagram showing a comparison between simulation and actual efficiency provided in an embodiment of the present application.

Marks and corresponding parts names in the attached drawings:

1-first radiator, 2-second radiator, 3-PCB board, 4-soldering point, 5-clearance area, 6-microstrip line, 7-feeding point, 8-antenna assembly, 9-antenna test board, 10-coupling gap, 11-soldering pad, 12-capacitor, 13-inductor.

Detailed ways

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.

It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.

The document management method provided in the embodiment of the present application can be applied to any field that requires document management.

Before introducing the technical solution of the present application, the relevant knowledge of the technical solution of the present application will be explained below.

WIFI (Wireless Fidelity, wireless communication technology), also known as the 802.11b standard, is an industrial standard (IEEE802.11) for network communications defined by IEEE (Institute of Electrical and Electronics Engineers).

Standing wave ratio: The full name of standing wave ratio is voltage standing wave ratio, also known as VSWR and SWR, which is the abbreviation of Voltage Standing Wave Ratio in English. It refers to the ratio of the voltage at the antinode of the transmission line to the voltage at the trough, also known as the standing wave coefficient. When the standing wave ratio is equal to 1, it means that the impedance of the feeder and the antenna is completely matched. At this time, all the high-frequency energy is radiated by the antenna, and there is no reflection loss of energy; when the standing wave ratio is infinite, it means full reflection, and no energy is radiated.

Antenna is the most basic component in wireless communication system. It is the device that connects the communication system to the outside. The function of antenna is to convert the electrical signal in the communication equipment and the electromagnetic wave in the space. Therefore, the communication system cannot do without antenna, including navigation positioning, satellite, broadcasting, radio detection, military communication, etc. With the rapid development of society, the application of science and technology has improved people's quality of life. The demand for information interaction is increasing. More and more mobile devices and data terminals are connected. The Internet of Everything in the application field has a huge demand for wireless data traffic. The rapid development of mobile communication technology cannot make up for the increasingly insufficient gap in wireless spectrum resources. In order to increase the capacity of the communication system, avoid channel congestion and interference, enhance the anti-interference ability, etc., the requirements for antenna performance are also constantly increasing. The role of the antenna is not only to send/receive signals, but also to meet more and higher requirements, such as: multi-frequency and broadband antennas that can cover multiple communications. These make it difficult for the original single-frequency or dual-frequency WIFI antennas to meet the needs of high data interaction and stable and smooth links in modern communication systems; if multiple antennas are used to achieve the above purpose, it will cause mutual coupling interference between multiple antennas, and the equipment will be difficult to dissipate heat, which will reduce the communication quality and increase the communication cost. Therefore, people have been looking for more spectrum, wider band and higher frequency to make WIFI antenna meet the needs of modern communication.

The 2.4GHZ Wi-Fi frequency band is divided into 14 channels, and the operating frequency range is 2.402GHZ-2.483GHZ. The bandwidth of each channel is 22MHZ, and the center frequency of each channel increases in multiples of 5MHZ, the effective bandwidth is 20MHZ, and the remaining 2MHZ belongs to the isolation protection bandwidth. In the entire 2.4GHZ frequency band, only channels 1, 6, and 11 will not overlap each other; and 2.4GHZ is a common ISM (Industrial Scientific Medical) frequency band in all countries in the world, and has been widely used in home and commercial fields. Wireless LAN, wireless USB (Universal Serial Bus), Bluetooth, microwave ovens (any frequency band between 1 and 20GHZ), ZigBee and other wireless networks can all work on the 2.4GHZ frequency band. As more and more wireless devices are used, people enjoy convenience and speed, but the electromagnetic compatibility problems of these technologies are becoming increasingly prominent. The 2.4GHZ frequency band is already crowded, and they will interfere with WiFi signals, slow down the speed, and cause network congestion. Therefore, 2.4GHZ WiFi has a low operating frequency, slow speed, and greater interference.

5GHZ is a technical standard 802.11ac launched by the WiFi Alliance. In 2012, the IEEE 802.11x technical standard was upgraded to the latest 802.11ac version, which supported the 5GHZ frequency band for the first time, while the previous four generations of technical standards only used the 2.4GHZ frequency band for signal wireless transmission. The core technology of the 802.11ac standard is mainly based on 802.11a, and continues to work on the 5GHZ frequency band to ensure backward compatibility (it can cover both the 5GHZ and 2.4GHZ frequency bands), but the data transmission channel will be greatly expanded. The theoretical transmission speed of the new standard is expected to reach 1Gbps at most, which can transmit 125MB per second, and can achieve uncompressed transmission of high-definition video.

Another major advantage of the new standard is energy saving, with power usage efficiency six times that of the previous generation. As more content is transmitted at the same time, devices can also enter low-power power saving mode more quickly.

The downside is that 5GHZ has poor wall penetration capability and signal attenuation is greater than 2.4G, making it only suitable for small-scale indoor coverage and outdoor bridges.

As mentioned above, the 2.4 GHz and 5 GHz frequency bands used by Wi-Fi are already very crowded. This is reflected in the user experience, which is an increase in network latency, a decrease in user speed, and more frequent interference between WiFi antennas.

In order to solve the above problems, an embodiment of the present application provides a miniaturized ultra-wideband antenna system, which includes a first radiator and a second radiator; the first radiator is used to send signals of at least two frequency bands; the second radiator is used to send signals of at least one frequency band; and the frequency bands corresponding to the signals of at least two frequency bands sent by the first radiator do not overlap with the frequency bands corresponding to the signals of at least one frequency band sent by the second radiator. Compared with the existing single-frequency or dual-frequency WIFI antenna, the multi-frequency WIFI antenna proposed in the embodiment of the present application increases the working bandwidth of the WIFI antenna, solves the problem of frequency band congestion, and reduces interference between antennas.

FIG1 is a schematic structural diagram of a miniaturized ultra-wideband antenna system provided in an embodiment of the present application.

As shown in FIG1 , the system includes an antenna assembly, which includes a first radiator 1 and a second radiator 2 ;

A first radiator 1, used for sending signals in at least two frequency bands;

A second radiator 2, used for sending signals of at least one frequency band;

The frequency bands corresponding to the signals of at least two frequency bands sent by the first radiator 1 and the frequency bands corresponding to the signal of at least one frequency band sent by the second radiator 2 do not overlap.

The embodiment of the present application does not impose any specific limitation on the operating frequency band of the first radiator.

In an example, the first radiator operates in a frequency band of 2.4 GHZ-2.5 GHZ and a frequency band of 5.15 GHZ-5.85 GHZ.

In another example, the first radiator operates in a frequency band of 5.15 GHZ-5.85 GHZ and a frequency band of 5.925 GHZ-7.125 GHZ.

The embodiment of the present application does not impose any specific limitation on the operating frequency band of the second radiator.

In one example, the second radiator operates in a frequency band of 5.925 GHZ-7.125 GHZ.

In another example, the second radiator operates in a frequency band of 2.4 GHZ-2.5 GHZ.

Exemplarily, the first radiator operates in a frequency band of 5.15 GHZ-5.85 GHZ and a frequency band of 5.925 GHZ-7.125 GHZ, and the second radiator operates in a frequency band of 2.4 GHZ-2.5 GHZ.

In some embodiments, the first radiator is used to send a first frequency band signal and a second frequency band signal, and the routing length of the first radiator is related to the wavelength of the first frequency band signal, and the frequency band corresponding to the first frequency band signal is smaller than the frequency band corresponding to the second frequency band signal.

Exemplarily, the first radiator is used to send 5.15GHZ-5.85GHZ frequency band signals and 5.925GHZ-7.125GHZ frequency band signals, that is, the first frequency band signal is 5.15GHZ-5.85GHZ, and the second frequency band signal is 5.925GHZ-7.125GHZ. The first radiator needs to resonate at the 5.5GHZ frequency point, and the routing length of the first radiator is between 1/4 of the medium wavelength and 1/4 of the free space wavelength at the 5.15GHZ-5.85GHZ frequency band.

The embodiment of the present application does not impose any specific limitation on the structure of the routing.

In one example, the routing is an inverted F-type routing.

In another example, the trace is a straight trace.

In some embodiments, the first radiator and the second radiator are arranged side by side in the same plane, and there is a coupling gap between the first radiator and the second radiator, as shown in Figure 1, the size of the coupling gap is a preset value, and the preset value is used for the second radiator to generate a third frequency band signal after coupling the current in the second radiator.

Specifically, the first radiator forms a loop with the feeding point and the ground. The first radiator is connected to the feeding point and can be directly fed. The second radiator is not connected to the feeding point but only to the ground. The second radiator is arranged in parallel with the first radiator in the same plane, and there is a coupling gap between the first radiator and the second radiator. Therefore, the second radiator will produce a coupling effect with the first radiator. The first radiator directly feeds the second radiator through coupling. The second radiator will produce a resonance point corresponding to its own structural size, thereby expanding the working bandwidth of the entire antenna. Among them, the width of the coupling gap is inversely proportional to the coupling strength. The larger the width of the coupling gap, the smaller the coupling strength. The width of the coupling gap determines whether the second radiator can resonate at the corresponding frequency point. The second radiator can only send out the signal most effectively when it resonates at the frequency point corresponding to the third frequency band. When the width of the coupling gap is equal to the above-mentioned preset value, the second radiator can produce a better resonance effect at the corresponding frequency point, and the antenna performance is better.

In some embodiments, the routing length of the first radiator is less than a first value, the first value is the product of the wavelength of the first frequency band signal and a second value, and the second value is a positive number less than 1/4.

Exemplarily, the first radiator is used to send 5.15GHZ-5.85GHZ frequency band signals and 5.925GHZ-7.125GHZ frequency band signals, that is, the first frequency band signal is 5.15GHZ-5.85GHZ, and the second frequency band signal is 5.925GHZ-7.125GHZ. The first radiator needs to resonate at the 5.5GHZ frequency point, and the routing length of the first radiator is less than a first value, which is the product of the free space wavelength corresponding to the 5.15GHZ-5.85GHZ frequency band and the second value, and the second value is a positive number less than 1/4.

In some embodiments, the first end of the first radiator is connected to the feeding point, the second end of the first radiator is grounded, and the second radiator is grounded.

Specifically, the first end of the first radiator is connected to the feeding point, and the second end of the first radiator is grounded, so that a loop is formed between the feeding point, the first radiator and the ground. The second radiator is grounded and not connected to the feeding point, so it cannot be directly fed. The first radiator feeds the second radiator by coupling.

In some embodiments, the miniaturized ultra-wideband antenna system further includes a capacitor, and the second end of the first radiator is grounded through the capacitor.

The capacitor is used to generate a second frequency band signal after the first radiator is fed. Specifically, the first radiator is used to send the first frequency band signal and the second frequency band signal, and the wiring length of the first radiator is related to the wavelength of the first frequency band signal, and the frequency band corresponding to the first frequency band signal is smaller than the frequency band corresponding to the second frequency band signal. Among them, the first radiator will generate a resonance point corresponding to its own structural size, that is, the first radiator resonates at the frequency point corresponding to the first frequency band and the second frequency band. In order to make the first radiator also produce the best resonance effect at the frequency point corresponding to the second frequency band, the embodiment of the present application connects the second end of the first radiator to one end of the capacitor, and the other end of the capacitor is grounded. The first radiator is coupled to the ground, which has a better tuning effect, so that the first radiator can send the first frequency band signal and the second frequency band signal.

In some embodiments, the miniaturized ultra-wideband antenna system further includes an inductor, and the second radiator is grounded through the inductor.

Compared with the method of directly grounding the second radiator, the embodiment of the present application connects the second radiator to the inductor. Through the grounding of the inductor, the second radiator can resonate at the frequency point corresponding to the third frequency band.

The embodiment of the present application does not impose any specific limitation on the feeding form of the antenna.

In one example, the antenna is fed by a coaxial line.

In another example, the antenna adopts a coupled feeding method.

In another example, the antenna is fed by a microstrip line.

In this example, the miniaturized ultra-wideband antenna system further includes a microstrip line, and the first end of the first radiator is connected to the feeding point through the microstrip line.

In some embodiments, in order to prevent a circuit break between the antenna and the module, a 0 ohm resistor is provided on the microstrip line.

In some embodiments, in order to prevent a circuit break between the antenna and the module, a capacitor or an inductor may be provided on the microstrip line.

In some embodiments, the miniaturized ultra-wideband antenna system further includes a matching circuit connected to the microstrip line, the matching circuit being used to adjust the resonance point of the antenna so that the first radiator transmits at least two frequency bands. The second radiator sends a signal of at least one frequency band.

The impedance of the antenna is affected by factors such as the PCB (printed circuit board), the installation of the antenna, and the surrounding metal. In order to solve the problem of poor radiation signal effect caused by interference from the external environment, it is usually necessary to reserve a π-type matching circuit between the antenna and the module RF output pin. This matching circuit can match the antenna to 50 ohms when the antenna deviates seriously from the 50 ohm impedance. Among them, the matching circuit includes 3 reactance elements.

In some embodiments, the first radiator includes a first rectangular body, the second radiator includes a second rectangular body, and the first rectangular body and the second rectangular body have the same width.

Specifically, the wiring structure of the first radiator is rectangular, and the wiring structure of the second radiator is also rectangular, wherein the width of the rectangle of the wiring structure of the first radiator is equal to the width of the rectangle of the wiring structure of the second radiator.

In some embodiments, the length of the first rectangular body is less than the length of the second rectangular body.

Exemplarily, the first radiator is used to send 5.15GHZ-5.85GHZ frequency band signals and 5.925GHZ-7.125GHZ frequency band signals, and the second radiator is used to send 2.4GHZ-2.5GHZ frequency band signals. The routing length of the first radiator is related to the wavelength at the 5.15GHZ-5.85GHZ frequency band, and the routing length of the second radiator is related to the wavelength at the 2.4GHZ-2.5GHZ frequency band. Among them, the wavelength is inversely proportional to the frequency, and the 2.4GHZ-2.5GHZ frequency band is smaller than the 5.15GHZ-5.85GHZ frequency band. Therefore, the routing length of the first radiator is smaller than that of the second radiator, that is, the length of the first rectangular body is smaller than the length of the second rectangular body.

In some embodiments, the first radiator and the second radiator are printed on a PCB board.

The embodiment of the present application does not impose any specific limitation on the material of the above-mentioned PCB board.

In one example, the PCB board is made of epoxy resin board.

The main components of epoxy resin board are epoxy resin and glass fiber cloth (FR4), and the dielectric constant is between 3.8 and 4.8. Its characteristics are that epoxy resin board is the cheapest board among RF boards, but due to the purity of epoxy resin, the dielectric constant between batches is not very stable, usually between 4 and 4.4; the loss is large, and the loss tangent reaches about 0.02; the moisture absorption rate is large, that is, it is easy to absorb water, which causes the change of dielectric constant and also affects the surface resistance, so that it is easy to break down at high power. When the loss effect is not great, epoxy resin board can be selected as the board of PCB for cost considerations.

In another example, the PCB board is made of polytetrafluoroethylene board.

The main components of PTFE sheet are PTFE and glass fiber cloth. Its dielectric constant can usually be The dielectric constant can be increased by filling ceramic powder between 2.1 and 3.5. The characteristics of polytetrafluoroethylene sheets are low loss and low dielectric constant. The ones with low dielectric constant and high dielectric constant are more expensive, while those around 2.5 are cheaper. Polytetrafluoroethylene sheets are widely used in the design of array antenna feed networks.

In another example, the PCB board is made of a ceramic board.

The main components of ceramic plates are ceramic powder and glass fiber cloth, and their dielectric constant is between 3 and 10. The characteristics of ceramic plates are high dielectric constant, large loss, good heat dissipation, and therefore widely used in high-power devices; the higher the dielectric constant, the more expensive it is, and it is suitable for high power and small size.

In some embodiments, the antenna is tested by an antenna test board, and the welding points of the antenna test board match the welding points of the antenna.

Specifically, the antenna test board and the antenna both have matching antenna fixing pads, and the antenna is connected to the antenna test board or PCB in the form of a patch. The antenna test board also includes a first connecting line and a second connecting line. The first radiator in the antenna is connected to one end of the capacitor through the first connecting line, and the other end of the capacitor is grounded; the second radiator in the antenna is connected to one end of the inductor through the second connecting line, and the other end of the inductor is grounded. The antenna test board also includes a microstrip line with a π-type matching circuit in the middle, and the microstrip line is used to connect the antenna and the feeding point.

In wireless communication, the antenna is often fixed on the PCB in a certain way to serve as the receiving end and transmitting end of the communication circuit signal on the PCB. In general, the antenna is fixed on the PCB by a threaded connection. When the antenna receives and transmits signals, it will enter the circuit on the PCB through the threaded column section or enter the antenna through the circuit output through the threaded column to be transmitted. This will cause a certain attenuation of the signal. In addition, the threaded fixed link of the antenna will increase the overall volume of the wireless communication device regardless of whether it is perpendicular to the PCB or placed in the same direction as the PCB.

The embodiment of the present application adopts SMT (Surface Mounted Technology) patch technology to reduce the size of the antenna without sacrificing the performance of the antenna. At the same time, the antenna test board and PCB board only need to retain a small clearance area for installing the antenna, saving costs.

Take the system as an example, which includes an antenna assembly 8 and an antenna test board 9, wherein the antenna assembly 8 includes a first radiator 1 and a second radiator 2, wherein the first radiator 1 is used to send 5.15GHZ-5.85GHZ frequency band signals and 5.925GHZ-7.125GHZ frequency band signals, and the second radiator 2 is used to send 2.4GHZ-2.5GHZ frequency band signals.

FIG. 2 is a schematic diagram of an antenna structure provided in an embodiment of the present application.

As shown in FIG2 , the first radiator 1 and the second radiator 2 are arranged side by side in the same plane, and A coupling gap 10 is provided between the second radiator and the first radiator, the first radiator is directly fed, and the second radiator is fed by coupling. The first radiator includes a first rectangular body, and the second radiator includes a second rectangular body, and the first rectangular body and the second rectangular body have the same width.

FIG3 is a schematic diagram of the structure of an antenna test board provided in an embodiment of the present application.

As shown in FIG3 , and in combination with FIG2 and FIG4 , the antenna test board 9 is provided with a clearance area 5, wherein the clearance area 5 includes 6 fixed pads 11. Similarly, the antenna assembly includes 6 welding points 4 that match the clearance area pads, and the area of the clearance area is slightly larger than the antenna size. The antenna is connected to the antenna test board or PCB in the form of a patch. The antenna test board also includes a first connecting line and a second connecting line. The first radiator in the antenna is connected to one end of the capacitor through the first connecting line, and the other end of the capacitor is grounded; the second radiator in the antenna is connected to one end of the inductor through the second connecting line, and the other end of the inductor is grounded. The antenna test board also includes a microstrip line 6 with a π-type matching circuit in the middle, and the microstrip line is used to connect the antenna assembly 8 and the feeding point 7.

In the embodiment of the present application, the clearance area 5 of the antenna test board 9 has an area of 9.8 mm*7.5 mm.

FIG4 is a schematic diagram of the installation of an antenna on a test board provided in an embodiment of the present application.

As shown in FIG. 4 and in combination with FIG. 3 , the antenna assembly 8 is installed in the clearance area 5 of the antenna test board 9 .

If the first radiator is to work in the 5.15GHZ-5.85GHZ frequency band and the 5.925GHZ-7.125GHZ frequency band, the structure and size of the first radiator should satisfy the conditions that the first radiator can resonate at 5.5GHZ and 7GHZ. Then, the trace length of the first radiator should be between 1/4 of the medium wavelength and 1/4 of the free space wavelength at the 5.5GHZ frequency band.

FIG. 5 is a schematic diagram of a simulation of an embodiment of the present application.

As shown in FIG. 5 , the first radiator is grounded via a capacitor 12 , and the second radiator is grounded via an inductor 13 .

According to the simulation and test results of the antenna test board, when the routing structure of the first radiator is rectangular, the length of the first radiator is 3.20mm, and the width is 6.20mm, the first radiator resonates at 5.5GHZ and 7GHZ, and can operate in the 5.15GHZ-5.85GHZ frequency band and the 5.925GHZ-7.125GHZ frequency band, and the antenna performance is optimal.

Among them, in order to make the resonance effect of the first radiator at 7GHZ better, according to the simulation and the test results of the antenna test board on the antenna, when the capacitance of the embodiment of the present application is 1pf, the adjustment effect of the resonance of the first radiator at 7GHZ is best and the antenna performance is best.

If the second radiator is to work in the 2.4GHZ-2.5GHZ frequency band, the structure and size of the second radiator should satisfy the condition that the second radiator can resonate at 2.45GHZ. Then, the trace length of the first radiator should be between 1/4 of the dielectric wavelength and 1/4 of the free space wavelength at the 2.45GHZ frequency band.

According to the simulation and test results of the antenna test board, when the routing structure of the second radiator is rectangular, the length of the second radiator is 3.60mm, and the width is 6.20mm, the second radiator resonates at the frequency of 2.45GHZ. The second radiator operates in the 2.4GHZ-2.5GHZ frequency band, and the antenna performance is optimal.

A coupling gap is provided between the second radiator and the first radiator. The width of the coupling gap is inversely proportional to the coupling strength. The larger the width of the coupling gap, the smaller the coupling strength. The width of the coupling gap determines whether the second radiator can resonate at the frequency of 2.45GHZ. Only when the second radiator resonates at the frequency of 2.45GHZ can the signal be sent out most effectively. The second radiator can operate in the 2.4GHZ-2.5GHZ frequency band. According to the test results of the antenna test board on the antenna, when the width of the coupling gap is equal to 0.80mm, the second radiator can resonate at the frequency of 2.45GHZ, the signal can be sent out most effectively, and the antenna performance is the best.

Among them, in order to make the second radiator resonate better at 2.45GHZ, according to the simulation and the test results of the antenna test board on the antenna, when the inductance of the embodiment of the present application is 2.7nh, the adjustment effect of the resonance of the second radiator at 2.45GHZ is best, and the antenna performance is the best.

The first radiator and the second radiator are both printed on a dielectric substrate. The dielectric substrate in the embodiment of the present application is a PCB board made of FR4 material with a dielectric constant of 4.4. The length of the PCB is 7.90 mm-8.10 mm and the width is 6.50 mm-6.70 mm.

FIG6 is a schematic diagram showing a comparison between the simulation and actual standing wave ratios provided in an embodiment of the present application.

As shown in Figure 6, the simulation and real standing wave ratios of the antenna are close. In the 2.4GHZ-2.5GHZ frequency band, the 5.15GHZ-5.85GHZ frequency band, and the 5.925GHZ-7.125GHZ frequency band, the standing wave ratio of the antenna is less than 2, and the standing wave ratio in the 2.4GHZ-2.5GHZ frequency band is close to 1. According to the definition of standing wave ratio, standing wave ratio VSWR (Voltage Standing Wave Ratio) is the abbreviation of voltage standing wave ratio, which refers to the ratio of the amplitude of the reflected wave to the amplitude of the incident wave. When the impedance is perfectly matched under ideal conditions, the value of the standing wave ratio is 1. In actual engineering, there must be reflection, and the standing wave ratio at this time is greater than 1. The greater the reflection, the greater the standing wave ratio. Therefore, for the technical parameter of standing wave ratio, the lower the value and the closer it is to 1, the better.

Therefore, from the comparison diagram of the standing wave ratio between the simulation and the actual figure, it can be seen that the antenna can work at 2.4GHZ-2.5GHZ frequency band, 5.15GHZ-5.85GHZ frequency band and 5.925GHZ-7.125GHZ frequency band.

As shown in FIG7 , the efficiency results of the simulation and the actual antenna are similar, and the antenna has higher efficiency when operating in the 2.4 GHZ-2.5 GHZ frequency band, the 5.15 GHZ-5.85 GHZ frequency band, and the 5.925 GHZ-7.125 GHZ frequency band.

To sum up, the first radiator can operate in the 5.15GHZ-5.85GHZ frequency band and the 5.925GHZ-7.125GHZ frequency band, the second radiator can operate in the 2.4GHZ-2.5GHZ frequency band, and the entire antenna can operate in the 2.4GHZ-2.5GHZ frequency band, the 5.15GHZ-5.85GHZ frequency band and the 5.925GHZ-7.125GHZ frequency band. Compared with the existing 2.4GHZ single-frequency antenna, or the 2.4GHZ&5GHZ dual-frequency antenna, the antenna in the embodiment of the present application adds a working frequency band of 5.925GHZ-7.125GHZ, expands the working bandwidth of the antenna, solves the congestion problem of the existing 2.4GHZ frequency band and the 5GHZ frequency band, and reduces interference between antennas. The first radiator and the second radiator in the antenna are printed on the PCB board, and the antenna routing adopts a rectangular structure. In this way, the size of the antenna body is reduced in the antenna design, and the antenna is coupled to the antenna test board or PCB in the form of a patch, which reduces the attenuation of the signal and reduces the overall volume of the wireless communication device. At the same time, as the antenna size is reduced, the clearance area of the antenna test board or PCB board is also smaller, thereby reducing the overall volume of the wireless communication device.

The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further explain various possible combinations. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the ideas of the present application, they should also be regarded as the contents disclosed in the present application.

Those of ordinary skill in the art will appreciate that the modules and steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

In the several embodiments provided in the present application, it should be understood that the disclosed system can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the module is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of the system or module, which can be electrical, mechanical or other forms.

Claims

A miniaturized ultra-wideband antenna system includes an antenna assembly, wherein the antenna assembly includes a first radiator and a second radiator;

The first radiator is used to send signals in at least two frequency bands;

The second radiator is used to send signals of at least one frequency band;

The frequency bands corresponding to the signals of at least two frequency bands sent by the first radiator and the frequency bands corresponding to the signal of at least one frequency band sent by the second radiator do not overlap.
The system according to claim 1, wherein the first radiator is used to send a first frequency band signal and a second frequency band signal, and the routing length of the first radiator is related to the wavelength of the first frequency band signal, and the frequency band corresponding to the first frequency band signal is smaller than the frequency band corresponding to the second frequency band signal.
The system according to claim 2, wherein the routing length of the first radiator is less than a first value, the first value is the product of the wavelength of the first frequency band signal and a second value, and the second value is a positive number less than 1/4.
The system according to claim 1, wherein the first radiator and the second radiator are arranged side by side in the same plane, and there is a coupling gap between the first radiator and the second radiator, and the size of the coupling gap is a preset value, and the preset value is used for the second radiator to generate a third frequency band signal after coupling the current in the second radiator.
The system according to claim 1, wherein a first end of the first radiator is connected to a feed point, a second end of the first radiator is grounded, and the second radiator is grounded.
The system according to claim 5, further comprising a capacitor, wherein the second end of the first radiator is grounded through the capacitor.
The system according to claim 5, wherein the system further comprises an inductor, and the second radiator is grounded through the inductor.
The system according to claim 5, wherein the system further comprises a microstrip line, and the first end of the first radiator is connected to the feeding point through the microstrip line.
The system according to claim 8, wherein a 0 ohm resistor is provided on the microstrip line.
The system according to claim 7, wherein the system further comprises a matching circuit connected to the microstrip line, wherein the matching circuit is used to adjust the resonance point of the antenna so that the first radiator transmits the signals of the at least two frequency bands and the second radiator transmits the signals of the at least one frequency band. Number.
The system according to any one of claims 1 to 10, wherein the first radiator comprises a first rectangular body, the second radiator comprises a second rectangular body, and the first rectangular body and the second rectangular body have the same width.
The system of claim 11, wherein a length of the first rectangular body is less than a length of the second rectangular body.
The system according to any one of claims 1 to 10, wherein the antenna is obtained by testing an antenna test board, and welding points of the antenna test board match welding points of the antenna.