Horizontally Polarized Micro Antenna Isolation
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Solution Overview
Problem
Current wireless access points experience degraded performance and reduced throughput when co-located radios operate in the same band due to interference and excessive noise floor, leading to packet loss and limited signal-to-noise-plus-interference-ratio (SINR).
Innovation Solution
The implementation of a 'macro-micro' cell approach with vertically and horizontally polarized antennas, where micro cell antennas are printed and co-planar with the magnetic fields generated by macro cell antennas, reducing interference and increasing isolation between co-located same-band radios by creating concentric coverage areas and using polarization diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If co-located radios operate in the same band, then device functionality and coverage are improved, but interference and packet loss increase due to transmitter signals overdriving receivers
Solution Approach 1:
The patent introduces polarization as an additional dimension for signal separation. By using antennas with orthogonal polarizations (one vertical, one horizontal), the system creates independent signal channels that prevent mutual interference between co-located radios operating in the same frequency band, thereby maintaining reliable packet reception while enabling dual-radio operation.
2Use of energy by moving object
If transmitter power is increased to improve coverage, then signal range is extended, but receiver sensitivity is degraded by overdriving from close proximity signals
Solution Approach 1:
The patent applies local quality by assigning different polarization characteristics to different antenna elements. The first antenna is configured with vertical polarization while the second antenna uses horizontal polarization, creating locally differentiated signal properties that allow high power transmission without degrading receiver sensitivity in the same band.
3Reliability
If antenna isolation is increased to reduce interference, then signal-to-noise ratio is improved, but physical space requirements and device complexity increase
Solution Approach 1:
The patent changes the polarization parameter of the antennas to achieve high isolation. By configuring one antenna with vertical polarization and another with horizontal polarization, the system obtains significant isolation (40-45 dB) between co-located antennas without requiring large physical separation, thus improving SINR while maintaining compact device 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
This design enhances the performance of dual-radio network devices by reducing interference and increasing isolation between antennas, allowing them to operate simultaneously with improved throughput and reduced packet loss, even when transmitting and receiving in the same frequency band.
Implementation Method 1
The implementation of a 'macro-micro' cell approach with vertically and horizontally polarized antennas, where micro cell antennas are printed and co-planar with the magnetic fields generated by macro cell antennas, reducing interference and increasing isolation between co-located same-band radios by creating concentric coverage areas and using polarization diversity.
Data Source
AI summary
The embodiments herein use polarization diversity between antennas where the antennas for one cell are, e.g., horizontally polarized and antennas for the other cell are vertically polarized. In one embodiment, the antennas for a macro cell are vertically polarized while micro cell antennas are horizontally polarized. In one example, the micro cell antennas are printed antennas that form a loop that is co-planar with the magnetic fields generated by the macro cell antennas when transmitting. Because the magnetic fields are co-planar (rather than orthogonal) to the current flowing through the loop in the micro cell antenna, the effect of the electromagnetic signals emitted by the macro cell antenna is reduced. This may permit dual radio network devices to have improved performance when operating simultaneously—e.g., when the macro cell radio is transmitting and the micro cell radio is receiving at or near the same frequency band.