Orthogonal PCB Antenna Layout With Decoupling for High Isolation
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Solution Overview
Problem
Existing antenna systems in electronic devices face challenges with limited isolation between multiple antennas, particularly at low-band frequencies, which affects MIMO system performance and can lead to intermodulation issues causing certification failures.
Innovation Solution
A multiband high-isolation antenna system is implemented using a generally-circular printed circuit board with two orthogonal antennas and a decoupling structure, providing high isolation and enabling five unique resonant modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are implemented in an electronic device for wireless communication, then wireless communication capability is improved, but isolation between the multiple antennas deteriorates
Solution Approach 1:
A decoupling structure is introduced as an intermediary element between the first and second antennas. This decoupling structure includes a first decoupling element connected to the first antenna and a second decoupling element connected to the second antenna, which actively manages and reduces the coupling between antennas, thereby improving isolation while maintaining multi-antenna wireless communication capability
Solution Approach 2:
The antenna system is segmented into distinct functional components: the first antenna, the second antenna, and the decoupling structure with its separate decoupling elements. This segmentation allows each component to be optimized independently, with the decoupling elements specifically designed to manage electromagnetic interactions between the antenna segments
2Volume of moving object
If multiple antennas are placed in close proximity to save space, then device compactness is improved, but antenna isolation deteriorates
Solution Approach 1:
The decoupling structure extends the isolation mechanism into a third dimensional space between the antennas. By placing decoupling elements in the spatial region between the first and second antennas, the system achieves effective isolation without increasing the planar footprint, thus maintaining device compactness while improving antenna isolation
3Speed
If antennas operate at low-band frequencies, then communication range is improved, but isolation between antennas deteriorates
Solution Approach 1:
The decoupling structure is designed with specific geometric parameters (length, width, orientation) that are optimized to be effective at low-band frequencies. The first and second decoupling elements have dimensions and configurations that create electromagnetic cancellation effects specifically tuned for low-frequency operation, thereby maintaining isolation performance across the desired frequency range while preserving communication range benefits
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 antenna system achieves high isolation (greater than 20 dB) between antennas at multiple bands, enhancing MIMO and diversity performance while reducing intermodulation issues.
Implementation Method 1
a decoupling structure connected to the printed circuit board at a location between the first antenna and the second antenna
Implementation Method 2
This arrangement may provide high isolation between the antennas and enable five unique resonant modes of operation for the multimode high-isolation antenna system
Data Source
AI summary
Various arrangements of antenna systems are detailed herein. Such an antenna system can include first antenna connected to a printed circuit board. The antenna system further includes a second antenna connected to the printed circuit board. The antenna system further includes a decoupling structure connected to the printed circuit board at a location between the first antenna and the second antenna.