Multilayer Patch Antenna Thru-Hole Metal Layer Parasitic Resonance
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Solution Overview
Problem
Multilayer patch antennas experience parasitic resonance and reduced isolation due to coupling between power feeding pins and lower patch antennas, leading to decreased antenna efficiency in vehicles equipped with multiple frequency band receivers.
Innovation Solution
A multilayer patch antenna design where a metal layer is formed on the inner wall of thru-holes through which power feeding pins pass, preventing parasitic resonance and maintaining isolation between upper and lower patch antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multilayer patch antenna is designed with power feeding pins penetrating the lower patch antenna to feed the upper patch antenna, then the antenna can receive multiple frequency band signals, but parasitic resonance occurs due to coupling between the power feeding pin and lower patch antenna
Solution Approach 1:
A ground pin is introduced as an intermediary element between the power feeding pin and the lower patch antenna. The ground pin is electrically connected to the lower patch antenna and positioned adjacent to the power feeding pin, acting as a mediator to reduce parasitic coupling. This intermediary structure provides a controlled impedance path that prevents unwanted resonance while maintaining the multilayer antenna's multi-frequency capability
2Device complexity
If power feeding pins penetrate the lower patch antenna to feed the upper patch antenna, then the antenna structure is formed, but isolation between upper and lower patch antennas is reduced due to parasitic resonance
Solution Approach 1:
The ground pin serves as a mediator that reduces parasitic coupling between the power feeding pin and lower patch antenna. By being electrically connected to the lower patch antenna and positioned adjacent to the power feeding pin, it provides a controlled impedance path that maintains isolation between antenna layers while preserving the structural integrity of the multilayer design
3Reliability
If isolation between upper and lower patch antennas is reduced due to parasitic resonance, then the antenna structure functions, but antenna efficiency is reduced
Solution Approach 1:
The ground pin acts as an energy-dissipating intermediary that reduces parasitic resonance. By providing a controlled impedance path adjacent to the power feeding pin and electrically connecting to the lower patch antenna, it prevents energy loss through unwanted resonance modes, thereby improving overall antenna efficiency while maintaining functional operation
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 effectively prevents parasitic resonance, enhancing isolation and antenna efficiency by up to 8.47 dB, ensuring better signal reception for multiple frequency bands in limited vehicle mounting spaces.
Implementation Method 1
parasitic resonance occurs due to the coupling between the power feeding pin 30 that penetrates the lower patch antenna 20 and the lower patch antenna 20
Data Source
AI summary
Presented is a multilayer patch antenna which prevents the occurrence of parasitic resonance by having a metal layer formed on the inner wall of a thru-hole, among a plurality of thru-holes formed in a lower patch antenna, penetrated by a power feeding pin of an upper patch antenna. The multilayer patch antenna presented herein comprises: an upper patch antenna having a first thru-hole formed therein; a lower patch antenna having a second thru-hole and a third thru-hole formed therein, away from each other; a first upper power feeding pin protruding under the lower patch antenna by penetrating the first thru-hole and the second thru-hole; a lower power feeding pin protruding under the lower patch antenna by penetrating the third thru-hole; and a metal layer formed inside the second thru-hole.