Patch Antenna Ground Structure for Radio Wave Leakage Suppression
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Solution Overview
Problem
Existing antenna devices suffer from deterioration of antenna characteristics due to radio wave leakage through no-arrange regions outside the main plate, leading to reduced gain and directivity.
Innovation Solution
Incorporating a metal support portion that contacts the no-arrange region on the substrate, reflecting radio waves and preventing leakage, thereby maintaining antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a no-arrange region is provided outside the main plate on the substrate, then ease of manufacture is improved, but antenna characteristics deteriorate due to radio wave leakage
Solution Approach 1:
A ground connection structure is introduced as an intermediary element between the no-arrange region and the main plate. This structure includes a ground connection electrode that extends from the rear surface of the substrate through the no-arrange region to connect with the main plate, effectively blocking radio wave leakage paths while maintaining the manufacturing advantages of the no-arrange region configuration.
Solution Approach 2:
The solution transitions from a two-dimensional planar configuration to a three-dimensional structure by extending the ground connection electrode vertically through the substrate thickness. This vertical extension allows the electrode to bridge the no-arrange region and establish electrical connection with the main plate, creating additional leakage prevention paths without complicating the planar layout.
2Reliability
If the main plate is extended to the edge of the substrate, then antenna characteristics are improved by preventing leakage, but device complexity increases
Solution Approach 1:
The ground connection structure is segmented into distinct functional parts: a ground connection electrode extending through the substrate, a connection portion linking to the main plate, and a grounding portion connected to the ground. This segmentation allows each part to be optimized independently while collectively achieving leakage prevention without requiring the entire main plate to extend to the substrate edge.
3Reliability
If a ground connection structure is added to prevent leakage, then antenna characteristics are improved, but manufacturing precision requirements increase
Solution Approach 1:
The ground connection structure is merged with existing substrate and main plate components rather than being a completely separate element. The ground connection electrode is integrated into the substrate structure, and its connection portion is formed as part of the overall antenna assembly, allowing standard manufacturing processes to be used without requiring additional high-precision alignment steps.
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
This configuration effectively suppresses radio wave leakage, improving antenna gain and directivity by ensuring that radio waves are reflected back into the intended direction, thus enhancing overall antenna characteristics.
Implementation Method 1
The metal member reflects radio waves radiated from the patch portion
Data Source
AI summary
An antenna is disposed, as a part of a conductor, on a substrate. The antenna includes a main plate providing a ground potential; and a patch portion arranged to face the main plate in Z direction. The substrate has a no-arrange region in which no conductor is arranged as a region between a periphery and the main plate in a plan view. A metal support portion of a case is in contact with the no-arrange region on a bottom surface of the substrate. The metal member is in contact with the no-arrange region on a top surface or on a bottom surface opposite to the top surface in the plate thickness direction of the substrate.