Patch Antenna Slit Impedance Tuning Without Polarization Bend
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Solution Overview
Problem
Existing patch antennas face challenges in adjusting impedance without altering the shape of conductor layers other than the patch conductor, which can lead to changes in filter characteristics and polarization plane bending.
Innovation Solution
A patch antenna design featuring a slit separated from the outer peripheral end of the patch conductor, allowing impedance adjustment through slit shape and position while fixing the feed point, without altering the conductor layer design or causing polarization plane bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the position of the feed point is shifted to adjust impedance, then impedance characteristics are improved, but the shape of the conductor pattern in the lower layer must be changed, causing large design changes and filter characteristic changes
Solution Approach 1:
The invention introduces a feed conductor that is separated from the patch conductor, with the feed point positioned at a specific location on the patch conductor. This segmentation allows independent adjustment of the feed conductor position without requiring changes to the patch conductor shape or lower layer conductor patterns, thus resolving the contradiction between impedance adjustment and design complexity
Solution Approach 2:
The feed conductor acts as an intermediary element between the power source and the patch conductor. By adjusting the position and shape of the feed conductor rather than the patch conductor itself, the invention enables impedance tuning without affecting the lower layer conductor patterns or filter characteristics
2Manufacturing precision
If a slit is formed in the ground pattern overlapping the patch conductor to adjust impedance, then impedance characteristics are improved, but filter characteristics may be changed when a filter circuit is disposed in the lower layer
Solution Approach 1:
The invention extracts the impedance adjustment function from the ground pattern and transfers it to the feed conductor. By forming a slit in the feed conductor rather than the ground pattern, the invention enables impedance tuning without affecting the ground pattern or lower layer filter circuits, thus preserving filter characteristics while achieving impedance adjustment
3Manufacturing precision
If a slit extending from the outer peripheral end of the patch conductor toward the center is formed to adjust impedance, then impedance characteristics are improved, but the outer peripheral shape of the patch conductor is changed, causing a bend in the polarization plane
Solution Approach 1:
The invention segments the antenna structure into a patch conductor and a separate feed conductor. The slit is formed in the feed conductor rather than the patch conductor, allowing impedance adjustment without altering the outer peripheral shape of the patch conductor, thus preventing polarization plane bending while achieving impedance tuning
Data Source
AI summary
Disclosed herein is a patch antenna that includes a patch conductor and a feed conductor for feeding power to a feed point positioned within a surface of the patch conductor. The patch conductor has a slit around the feed point, the slit being separated from an outer peripheral end of the patch conductor.