Orthogonal Polarization Antenna with RF Combining for Fading Resistance
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Solution Overview
Problem
Current wireless communication devices, especially portable ones like USB plug-in dongles, face limitations due to low antenna gain and fading correlation among receiving antennas, which restrict data rate and spatial multiplexing capabilities, and are constrained by small size and complexity in integrating multiple antennas.
Innovation Solution
The antenna device incorporates two assemblies optimized for orthogonal polarizations, with one assembly using printed directional elements and the other using metamaterial-based omnidirectional elements, along with an RF signal handling system that separates and combines signals to reduce fading correlation and increase diversity, allowing for more antenna elements without increasing receiver complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple omnidirectional antennas are used to achieve spatial diversity, then fading resistance is improved, but the number of RF receivers required increases device complexity
Solution Approach 1:
The patent combines multiple RF signals from multiple receiving antennas into a single RF signal using an RF combining network. This allows spatial diversity to be achieved while using only one RF receiver, thereby reducing device complexity while maintaining fading resistance.
Solution Approach 2:
The single RF receiver is made universal by processing the combined signal from multiple antennas. The RF combining network enables one receiver to handle signals from multiple antennas, making the receiver multi-functional and reducing the total number of receivers needed.
2Length of stationary object
If antenna gain is increased to extend coverage range, then coverage range is improved, but directional antenna configuration increases device complexity
Solution Approach 1:
The patent segments the antenna system into multiple receiving antenna elements that can be individually configured. By using multiple simpler antenna elements instead of one complex high-gain directional antenna, the system achieves extended coverage through spatial diversity while keeping individual antenna elements relatively simple.
3Productivity
If the number of antenna elements is increased to improve MIMO performance, then spatial multiplexing capability is improved, but receiver complexity increases
Solution Approach 1:
The patent merges multiple RF signals from multiple antenna elements into a single combined RF signal using an RF combining network. This allows MIMO spatial multiplexing to be achieved with multiple antenna elements while using only one RF receiver, thereby improving productivity without increasing receiver complexity.
Data Source
AI summary
An antenna device including: a first antenna assembly configured to receive first radiofrequency signals polarized according to a first polarization; a second antenna assembly configured to receive second radiofrequency signals polarized according to a second polarization orthogonal to the first polarization; and a radiofrequency signal handling assembly coupled with the first and second antenna assemblies, and configured to handle the received first radiofrequency signals separately from the received second radiofrequency signals.