In-Vehicle Omnidirectional MIMO 4x4 Antenna

　　On-board omnidirectional MIMO 4x4 antenna: network connection guarantee in mobile travel

　　With the booming development of intelligent transportation and Internet of Vehicles, vehicles are no longer just a means of travel, but also a mobile intelligent space. As a key device to ensure stable and high-speed network connection of vehicles during movement, on-board omnidirectional MIMO 4x4 antenna is playing an increasingly important role.

　　Technical principles and characteristics

　　MIMO technology core

　　MIMO (Multiple Input Multiple Output) technology constitutes the technical core of the on-board omnidirectional MIMO 4x4 antenna. The antenna system is equipped with four transmitting antennas and four receiving antennas. Through spatial multiplexing technology, it can simultaneously transmit up to four independent data information streams in the same frequency band. The transmitter cleverly splits the original data into four sub-data streams, which are sent synchronously through four transmitting antennas. The receiver uses advanced and complex signal processing algorithms to accurately identify and separate these sub-data streams from the mixed signals received by the four receiving antennas, and then recombine them to restore the original data. Under ideal communication channel conditions, compared with the traditional single antenna (SISO) system, the vehicle-mounted omnidirectional MIMO 4x4 antenna can theoretically increase the data transmission rate to four times by virtue of spatial multiplexing technology, which strongly supports applications in the car that have strict requirements for high-speed data transmission, such as real-time playback of high-definition video and fast download of large data files.

　　Omnidirectional radiation advantage

　　The "omnidirectional" feature is a significant feature of the vehicle-mounted omnidirectional MIMO 4x4 antenna. It radiates signals uniformly in the horizontal direction around the antenna, and the signal coverage range presents a complete 360-degree circle. This feature enables the vehicle to receive signals from base stations in all directions relatively stably during driving, regardless of its position. In the complex road environment of the city, vehicles frequently turn and change lanes. The omnidirectional radiation feature ensures that the antenna will not lose the signal due to changes in the vehicle's position, and always provides a stable network connection for the in-vehicle equipment. For example, in the busy streets of the city center, where vehicles shuttle between high-rise buildings, the on-board omnidirectional MIMO 4x4 antenna can continuously capture signals from base stations in different directions, ensuring that passengers in the car can use the network smoothly for entertainment, office work and other activities.

　　Diversity technology ensures reliability

　　During wireless communication, signals are easily interfered by multiple complex factors such as multipath propagation, building obstruction, and bad weather, resulting in fading, which seriously affects the communication quality. The on-board omnidirectional MIMO 4x4 antenna uses diversity technology to effectively deal with this problem. This technology uses the principle that different antennas have different fading characteristics when receiving signals to obtain multiple signal copies from four receiving antennas. Then, through intelligent algorithms such as selection merging and maximum ratio merging, the copy with the best signal quality is selected, or multiple copies are optimized and merged, which significantly reduces the probability of deep signal fading and greatly improves the reliability of the received signal. In case of severe weather such as heavy rain and sandstorms, or when the vehicle is driving in areas such as tunnels and valleys where signals are easily blocked, the diversity technology of the vehicle-mounted omnidirectional MIMO 4x4 antenna can play a key role in maintaining the stability of the network connection in the vehicle and ensuring uninterrupted communication.

　　Product types and features

　　Common product models and parameters

　　Poynting MIMO - 3 - V2 - 17: This is a highly anticipated vehicle-mounted omnidirectional MIMO 4x4 antenna product. It is a versatile communication hub that integrates a 7-in-1 antenna system in a compact housing. Among them, the 4 cellular MIMO antennas support 5G/4G/3G/2G networks, and the broadband coverage range extends from 410MHz to 3800MHz, covering the emerging 450MHz and 3.5GHz CBRS bands, which makes it compatible with the networks of different operators and ready for future technological developments. 2 dual-band WiFi antennas with 2x2 MIMO capabilities can work in both 2.4GHz and 5GHz bands, providing reliable data rates for multiple devices in the car and effectively reducing interference. In addition, 1 GPS/GLONASS antenna can provide accurate location tracking services even in extreme temperature conditions as low as -40°F. In terms of gain, its cellular antenna peak gain is 6.2dBi, the WiFi antenna is 7dBi, and the GPS antenna is as high as 21dBi, which performs well at higher frequencies and can greatly enhance the signal strength of the cellular router and expand the coverage range. The antenna has an IP69K protection level and a rugged housing that can withstand harsh outdoor environments. At the same time, it provides a variety of flexible mounting options, including spigot mounting, surface mounting, and magnet mounting, so that users can easily install it according to the actual situation of the vehicle.

　　Other products: There are many other types of vehicle-mounted omnidirectional MIMO 4x4 antennas on the market. Some antennas focus on frequency coverage, some can cover a wider frequency band, such as 600-6000MHz, to adapt to changes in different communication standards and network environments; some show better performance in specific frequency bands. In terms of gain, it is generally between 3dBi-6dBi, and different gain values are suitable for different usage scenarios. Antennas with lower gain may be more suitable for use in urban central areas where signals are relatively stable and interference is less, while high-gain antennas are more advantageous in remote areas with weaker signals or high-speed driving scenarios. In terms of size and appearance design, products also vary. There are small, light, and low-wind resistance styles that can reduce the impact on vehicle driving; there are also larger-sized but more powerful products. Users can choose according to the type of vehicle (such as sedans, SUVs, trucks, etc.) and actual usage needs.

　　Design and installation considerations

　　Appearance and structural design: The appearance and structural design of the vehicle-mounted omnidirectional MIMO 4x4 antenna fully consider the vehicle's usage environment. Its shell is usually made of high-strength, weather-resistant materials, with waterproof, dustproof, UV-resistant and impact-resistant properties, and can withstand various harsh conditions faced by vehicles during driving. The layout of the four transmitting and receiving antennas inside the antenna has been carefully optimized to ensure that the antennas can work together to give full play to the advantages of MIMO technology, while minimizing mutual interference and ensuring stable signal transmission. Some high-end products also use special antenna vibrator design and signal shielding technology to further improve signal radiation efficiency and receiving sensitivity, while reducing the impact of external interference on antenna performance. In terms of appearance, some antennas are designed to be compact and low to reduce wind resistance and reduce the impact on vehicle driving stability and fuel economy; for some application scenarios with extremely high signal performance requirements, the antenna may adopt a slightly larger size design, but it will also optimize the appearance to minimize the impact on the vehicle's appearance and aerodynamics while meeting performance requirements.

　　Ease of installation and location selection: The installation process of this type of antenna is relatively simple, and most products will be equipped with installation kits designed specifically for vehicles and detailed installation guides. Common installation locations include the roof, luggage rack, and side of the vehicle. Taking roof installation as an example, some antennas can be fixed on the roof by magnetic attraction. When installing, you only need to place the antenna in a suitable position and use the adsorption force of the magnet to firmly fix it. There is no need to perform complex drilling or modification operations on the vehicle. It is convenient and quick and will not damage the appearance of the vehicle. For some scenarios that require more stable installation, the antenna can be fixed to the roof luggage rack with matching screws or clamps. When installing on the side of the vehicle body, it is usually fixed using the reserved mounting holes on the vehicle body or using a special bracket. The choice of installation location is crucial. Generally speaking, you should try to choose a location with less signal obstruction and a wide field of view to ensure that the antenna can receive the strongest and most stable signal. For example, installing the antenna in the center of the roof can minimize the obstruction of the vehicle body to the signal and achieve 360-degree all-round signal reception. At the same time, during the installation process, you must also pay attention to the distance between the antenna and other parts of the vehicle (such as metal body, electronic equipment, etc.) to avoid mutual interference that affects the antenna performance and the normal operation of the vehicle electronic system.

　　Application scenarios

　　Intelligent driving assistance and Internet of Vehicles communication

　　In the field of intelligent driving, the on-board omnidirectional MIMO 4x4 antenna plays an indispensable role. Vehicles rely on it to communicate with roadside infrastructure (such as intelligent traffic lights, roadside units RSU, etc.) and other vehicles (V2V, Vehicle-to-Vehicle) in real time to realize the Internet of Vehicles (V2X, Vehicle-to-Everything) function. Through these communications, vehicles can obtain important information such as real-time traffic conditions on the road ahead, signal light status, driving speed and location of other vehicles, and provide data support for the intelligent driving assistance system. For example, when a vehicle drives to an intersection, through Internet of Vehicles communication, the vehicle can know the countdown information of the traffic light in advance, and the intelligent driving assistance system can reasonably adjust the speed accordingly to achieve "green light smooth travel", avoid unnecessary parking and starting, improve road traffic efficiency, and reduce energy consumption and exhaust emissions. When encountering congestion or accidents on the road ahead, the vehicle can receive relevant information in a timely manner, plan detour routes in advance, and improve travel safety and convenience. In addition, the vehicle-mounted omnidirectional MIMO 4x4 antenna also supports vehicle remote diagnosis and software upgrade functions. Automakers can remotely obtain vehicle operation data through the network, monitor and diagnose the health of the vehicle in real time, promptly identify potential problems and provide maintenance suggestions for car owners. At the same time, when a new software version of the vehicle is released, it can be remotely upgraded with one click through the wireless network, bringing new functions and performance optimization to car owners, without having to go to the 4S store for tedious offline upgrade operations.

　　In-car entertainment and office

　　As people's requirements for travel experience continue to increase, the demand for in-car entertainment and office is growing. The vehicle-mounted omnidirectional MIMO 4x4 antenna provides passengers in the car with a stable and high-speed network connection, meeting their various entertainment and office needs during the journey. Passengers can smoothly watch high-definition online videos, play immersive online games, listen to high-quality music, etc. in the car. For example, when a family is on a long journey, children can watch their favorite cartoons through the in-car entertainment system, while parents can browse news and watch movies on their mobile phones or tablets and enjoy a pleasant journey. For business people, the vehicle-mounted omnidirectional MIMO 4x4 antenna allows them to carry out office activities efficiently in the car. They can hold video conferences anytime and anywhere to communicate with colleagues about work progress and discuss project plans; access internal company files through cloud services to perform file editing, transfer and other operations; and use online office software to process emails, make reports, etc., making full use of travel time and improving work efficiency, as if moving the office to the car.

　　Fleet management in the logistics and transportation industry

　　In the logistics and transportation industry, vehicle-mounted omnidirectional MIMO 4x4 antennas are crucial for fleet management. Through this antenna, logistics companies can monitor the location, driving speed, driving route and other information of each truck in real time to achieve accurate dispatch and management of the fleet. When the demand for goods in a certain area suddenly increases, logistics companies can quickly deploy nearby vehicles to the area for cargo transportation based on the real-time location information of the vehicle, improve logistics distribution efficiency and reduce operating costs. At the same time, the vehicle-mounted omnidirectional MIMO 4x4 antenna also supports real-time data transmission between vehicles and logistics centers. Truck drivers can use the on-board terminal to report the loading and unloading of goods, vehicle fault information, etc. to the logistics center in real time, and the logistics center can provide drivers with navigation guidance, task arrangements and other information in a timely manner to ensure the smooth progress of the cargo transportation process. In addition, through the Internet of Vehicles technology, logistics companies can also conduct statistical analysis on vehicle fuel consumption, mileage and other data, optimize vehicle routes and driving behaviors, reduce fuel consumption, and improve the company's economic benefits and environmental protection level.

　　With the continuous development of Internet of Vehicles technology and the gradual improvement of the intelligent transportation system, the application prospects of on-board omnidirectional MIMO 4x4 antennas will be broader. In the future, it is expected to make more breakthroughs in technological innovation, such as further optimizing signal processing algorithms, improving compatibility with emerging communication technologies (such as 6G), etc., to provide vehicles with faster, more stable and smarter network connection services, promote intelligent transportation and Internet of Vehicles industries to a new stage of development, and bring more convenience and innovation to people's travel and life.