Hybrid Multi-Antenna System for Wireless Communication
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Solution Overview
Problem
Conventional dual-polarized antenna systems for MIMO communication face challenges with large dimensions, co-channel interference, and reduced system throughput due to mutual coupling of compactly arranged antennas, making them unsuitable for integration in thin, light, and small wireless communication devices.
Innovation Solution
A hybrid multi-antenna system comprising a dipole antenna and a monopole-slot antenna on a shared substrate with a system ground plate as a reflector, where the antennas have a 90° phase difference and are positioned closely to reduce mutual coupling, allowing for high directivity and gain while minimizing space and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antenna units are arranged compactly to decrease the used space, then the dimension of the antenna system is reduced, but the signals received or transmitted by the antennas are mutual coupled causing co-channel interference and decreased system throughput
Solution Approach 1:
The antenna system is segmented into two distinct types: dipole antennas for one polarization and monopole-slot antennas for the orthogonal polarization. This segmentation allows each antenna type to be optimized for its specific function while maintaining compact arrangement, resolving the contradiction between small dimension and high system throughput by eliminating mutual coupling through polarization diversity.
Solution Approach 2:
The invention introduces polarization as an additional dimension for antenna arrangement. Instead of only arranging antennas in spatial dimensions (x, y, z), the system utilizes polarization dimension (horizontal/vertical or left-hand/right-hand circular polarization) to separate antenna functions. This allows compact spatial arrangement while maintaining signal isolation through orthogonal polarization states.
2Strength
If dual-polarized antenna uses complex feed-in network and multiple antenna units to enhance directivity and gain, then the antenna performance is improved, but the device complexity increases
Solution Approach 1:
The invention merges the functions of multiple antenna units into a hybrid configuration where dipole antennas and monopole-slot antennas work together on the same reflector. This combining approach achieves dual-polarization functionality and improved gain without requiring complex feed-in networks, as the hybrid antenna structure inherently provides the necessary polarization diversity and radiation characteristics.
Solution Approach 2:
The monopole-slot antenna serves multiple functions: it provides orthogonal polarization radiation, acts as a compact antenna structure, and integrates with the reflector system. This multi-functionality reduces the need for separate antenna units and complex feed networks, thereby reducing device complexity while maintaining or improving antenna gain.
3Reliability
If patch antenna or microstrip antenna uses large resonant length of about half wavelength, then the antenna provides stable operation at specific frequency, but the large dimension makes it unsuitable for MIMO multi-antenna communication system
Solution Approach 1:
The monopole-slot antenna structure employs a nested configuration where the slot is etched into the monopole antenna body. This nesting allows the antenna to achieve resonant operation at the desired frequency with a compact overall dimension, as the slot structure provides the necessary electrical length within a reduced physical footprint, making it suitable for MIMO systems.
Solution Approach 2:
The invention changes the antenna design parameters by using monopole and slot structures instead of traditional patch or microstrip antennas. This parameter change allows the antenna to achieve the required resonant length and stable operation at specific frequencies while maintaining a compact dimension suitable for integration in MIMO multi-antenna communication systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid system achieves improved antenna isolation, high directivity, and increased system throughput with reduced size, enabling efficient integration into wireless communication devices without the need for complex feed-in networks.
Implementation Method 1
The system ground plate is served as a reflector of the hybrid multi-antenna system
Implementation Method 2
The first and second signal feed-in sources are vertical to each other, and have the phase difference of 90°
Data Source
AI summary
A hybrid multi-antenna system includes a system circuit board, an antenna substrate, at least a dipole antenna, and at least a monopole-slot antenna. The system board has at least a system ground plate, and the system ground plate is served as a reflector of the hybrid multi-antenna system. The antenna substrate and the system ground plate have a first distance therebetween. The dipole antenna having a first signal feed-in source and the monopole-slot antenna having a second signal feed-in source respectively provide a first and second operating band, and they are on a surface of the antenna substrate. The monopole-slot antenna is located nearby the dipole antenna. The monopole-slot antenna and the dipole antenna have a second distance therebetween. The first and second signal feed-in sources are vertical to each other, and have the phase difference of 90°.