Dual-Polarized Antenna Reducing Cross-Polarization
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Solution Overview
Problem
Existing dual-polarized antennas for radio devices face challenges with cross-polarization levels due to their compact housing dimensions, which limits their performance in bandwidth-constrained communication systems.
Innovation Solution
A compact dual-polarized antenna is designed using L-cornered loop strips on a substrate, configured to resonate at the IMS frequency band, with a shared set of loop strips extending in orthogonal polarization directions and a single feed connection for symmetrical excitation, reducing cross-polarization issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact dual-polarized antenna is designed for portable radio devices, then the device size is reduced, but cross-polarization levels increase
Solution Approach 1:
The antenna is segmented into multiple loop strips arranged in specific configurations. Each loop strip is designed to resonate at the desired frequency, and their collective arrangement achieves dual-polarization functionality while maintaining compact dimensions and controlling cross-polarization levels through careful geometric segmentation
Solution Approach 2:
Different regions of the antenna structure are assigned different functional qualities. The loop strips are positioned and oriented to create specific radiation patterns in different polarization directions, with feed points strategically located to excite appropriate modes while minimizing cross-polarization interference in critical regions
2Productivity
If dual-polarization techniques are used to double communication capacity, then bandwidth utilization is improved, but antenna structure complexity increases
Solution Approach 1:
Multiple functional elements are merged into a unified loop strip structure. The antenna combines dual-polarization capability, frequency selectivity, and compact form factor into a single integrated design, eliminating the need for separate components and reducing overall structural complexity while maintaining high communication capacity
Solution Approach 2:
The loop strip antenna structure serves multiple functions simultaneously: it provides dual-polarization radiation, achieves frequency resonance at the desired band, maintains compact dimensions for portable devices, and controls cross-polarization levels. This multi-functionality reduces the need for additional components and simplifies the overall system design
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 solution provides a high-gain, high-efficiency, and compact dual-polarized antenna that effectively reduces cross-polarization levels, enhancing signal transmission and reception in bandwidth-constrained systems.
Implementation Method 1
The loop strips are of dimensions and are connected together to be resonant at the IMS, or other selected, frequency band at orthogonal polarization directions
Data Source
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AI summary
A dual-polarized antenna, and an associated methodology, is provided for a radio device, such as a mobile station. The antenna is formed of a plurality of loop strips disposed upon a substrate. The loop strips are configured into a pair of L-Cornered loops, with the loops sharing a shared set of loop strips. A loop strip of the shared set provides a single feed connection, positioned to pemit symmetrical excitation of the antenna.