Patch Antenna Impedance Matching Without Matching Circuit
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Solution Overview
Problem
Existing patch antennas face limitations in antenna gain and frequency band narrowing due to resonance matching circuits and increased dielectric loss, which affect their efficiency and interconnection line density.
Innovation Solution
A patch antenna configuration with a dielectric substrate and a substantially rectangular radiation element, featuring a feeding point with impedance matching equal to the feeder line impedance, and an optional concave part on the radiation element to improve gain and reduce power loss, allowing for reduced pitch arrangement of patch antennas in an array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a matching circuit is added to achieve impedance matching, then impedance matching is achieved, but the frequency band is narrowed and the antenna area increases
Solution Approach 1:
The patent removes the matching circuit from the antenna system by designing the radiation element with a specific impedance (50Ω) that directly matches the feeder line impedance. This extraction of the matching circuit eliminates the frequency band narrowing effect while maintaining impedance matching through the optimized radiation element geometry.
Solution Approach 2:
The patent changes the impedance parameter of the radiation element to 50Ω by adjusting its geometric dimensions, specifically designing it to have an impedance that matches the feeder line. This parameter change eliminates the need for a matching circuit and widens the frequency band.
2Reliability
If a matching circuit is added to achieve impedance matching, then impedance matching is achieved, but the antenna area increases
Solution Approach 1:
The patent removes the matching circuit from the antenna system by designing the radiation element with a specific impedance (50Ω) that directly matches the feeder line impedance. This extraction of the matching circuit eliminates the frequency band narrowing effect while maintaining impedance matching through the optimized radiation element geometry.
3Reliability
If the feeder line is extended to the antenna input part, then impedance matching is achieved, but power loss increases due to dielectric loss
Solution Approach 1:
The patent removes the matching circuit from the antenna system by designing the radiation element with a specific impedance (50Ω) that directly matches the feeder line impedance. This extraction of the matching circuit eliminates the frequency band narrowing effect while maintaining impedance matching through the optimized radiation element geometry.
4Power
If the antenna area is increased to increase gain, then antenna gain is improved, but the interconnection line density is reduced
Solution Approach 1:
The patent changes the impedance parameter of the radiation element to 50Ω by adjusting its geometric dimensions, specifically designing it to have an impedance that matches the feeder line. This parameter change eliminates the need for a matching circuit and widens the frequency band.
Data Source
AI summary
A patch antenna is disclosed that includes a dielectric substrate, a substantially rectangular radiation element formed of a conductive material on the dielectric substrate; and a feeder line connected to a feeding point for feeding to the radiation element. The feeding point has an impedance matching the impedance of the feeder line.