Compact MIMO Antenna With Meandering Radiator and Vertical Feeding
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Solution Overview
Problem
MIMO antennas require large dimensions on printed circuit boards to achieve effective communication, which is a challenge for compact electronic devices that need enhanced isolation and improved radiating performance without increasing bandwidth or transmission power.
Innovation Solution
A compact MIMO antenna design featuring a radiating portion with a meandering pattern, axial symmetry, and a coupling and feeding portion with specific LC matching circuits, which reduces current coupling between feeding portions to enhance isolation and radiating performance, allowing the antenna to cover radio frequency bands like 2.3 GHz-2.4 GHz under LTE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional MIMO antenna is formed by two normal antennas or an antenna array, then the data throughput and link range are improved, but the dimensions of the PCB become large
Solution Approach 1:
The patent utilizes the third dimension by positioning the first and second coupling and feeding portions on opposite surfaces of the PCB substrate. This vertical separation in the Z-dimension enables MIMO functionality while maintaining a compact footprint on the PCB plane, effectively resolving the contradiction between achieving MIMO performance and minimizing PCB area.
Solution Approach 2:
The antenna is segmented into distinct functional portions: a radiating portion and separate first and second coupling and feeding portions. This segmentation allows each component to be optimized independently and positioned strategically in 3D space, enabling compact integration while maintaining MIMO performance.
2Speed
If a conventional MIMO antenna is formed by two normal antennas or an antenna array, then the link range is improved, but the dimensions of the PCB become large
Solution Approach 1:
By separating the feeding portions onto opposite surfaces of the substrate, the patent creates sufficient electromagnetic isolation without requiring large lateral distances. This vertical dimension utilization maintains link range performance while minimizing the PCB footprint.
Solution Approach 2:
The substrate itself acts as an intermediary that provides both mechanical support and electromagnetic isolation between the first and second coupling and feeding portions. This eliminates the need for additional isolation structures or large spacing, enabling compact design while maintaining link range.
3Area of stationary object
If the antenna size is reduced for compact electronic devices, then the form factor is improved, but the isolation between antenna elements deteriorates
Solution Approach 1:
The patent achieves isolation in the vertical dimension by placing feeding portions on opposite surfaces of the substrate. This approach maintains effective isolation between antenna elements while allowing the antenna footprint on the PCB plane to be minimized, directly addressing the contradiction between compact size and isolation performance.
4Area of stationary object
If the antenna size is reduced for compact electronic devices, then the form factor is improved, but the radiating performance deteriorates
Solution Approach 1:
By utilizing the vertical dimension for feeding portion placement, the radiating portion can be optimized for maximum efficiency within the available planar space. The meandering pattern in the radiating portion further enhances this by increasing the effective electrical length within a compact physical footprint, maintaining radiating performance while minimizing area.
Solution Approach 2:
The meandering pattern of the radiating portion introduces curvature and complexity to the current path, increasing the effective electrical length without proportionally increasing the physical footprint. This allows the antenna to maintain resonant frequency and radiating efficiency in a compact form factor.
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 design achieves better isolation and radiating performance, enabling the antenna to operate effectively in compact PCBs while maintaining communication standards, specifically providing return loss attenuation less than −10 decibels, thus addressing the need for smaller form factors in electronic devices.
Implementation Method 1
a radiating portion (22) located on the second surface (104) of the substrate (10) and radiating electromagnetic signals from the first coupling and feeding portion (24, 26)
Implementation Method 2
The radiating portion (22) has a meandering pattern... reduces current coupling between feeding portions to enhance isolation
Implementation Method 3
a coupling part, wherein each of the first and second coupling and feeding portions (24, 26) includes a feeding part (241), a matching part (243) and a coupling part
Data Source
AI summary
An antenna disposed on a substrate includes a radiating portion, a first coupling and feeding portion, and a second coupling and feeding portion. A length of the radiating portion is substantially equal to a half wavelength of electromagnetic signals radiated by the radiating portion. Each coupling and feeding portion includes a feeding part and a coupling part. The feeding part feeds the electromagnetic signals to the radiating portion via the coupling part so as to achieve effects of a multiple-input multiple-output (MIMO) antenna. A gap is defined between the coupling part and the radiating portion to improve an isolation of the MIMO antenna.