Antenna Circuit Board Ground Layout for Bezel Interference Isolation
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Solution Overview
Problem
Existing antennas in image display devices experience radiation property disturbances and electrical interference due to proximity to bezel areas, especially in high or ultra-high frequency bands, leading to signal loss and frequency disturbances.
Innovation Solution
A circuit board design featuring a co-planar ground with partial cut grounds and a vertical ground structure, which includes a co-planar ground separated by recesses and a vertical ground that does not overlap certain portions, reducing electrical interference and enhancing feeding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radiator is disposed within the display area and the transmission line is shortened, then sensitivity and gain are improved and signal loss is reduced, but electrical interference from the bezel area disturbs antenna radiation properties
Solution Approach 1:
A ground isolation structure is introduced as an intermediary element between the signal wiring and the bezel area. This ground isolation structure acts as a mediator that blocks electrical interference from the bezel area while allowing the shortened transmission line to maintain low signal loss. The ground isolation structure includes a ground wiring connected to ground potential that physically and electrically separates the signal path from interfering electromagnetic fields in the bezel region.
Solution Approach 2:
The ground isolation structure is selectively positioned only in specific regions where electrical interference from the bezel area affects the antenna radiation properties. Rather than applying uniform grounding throughout, the ground isolation structure is locally applied near the radiator and transmission line connections to the bezel area, providing targeted interference protection while maintaining overall signal integrity.
2Speed
If the antenna operates in high frequency or ultra-high frequency band (20 GHz or more), then communication capability is enhanced, but signal/frequency disturbance occurs even by small electrical interference
Solution Approach 1:
The ground isolation structure serves as a protective intermediary that shields high-frequency signals (20 GHz or more) from electrical interference in the bezel area. At these ultra-high frequencies, even minor interference causes significant signal disturbance, but the ground isolation structure creates an electromagnetic barrier that protects the signal path, enabling reliable high-frequency operation.
Solution Approach 2:
The ground isolation structure is designed in advance to counteract electrical interference before it can affect the high-frequency signals. By pre-positioning the ground isolation structure with appropriate grounding, the system proactively prevents interference from coupling into the signal path, rather than attempting to correct interference after it occurs.
3Object-affected harmful factors
If a continuous ground is used in the bezel area, then electrical shielding is improved, but coupling and electric field interference increase with metal layers
Solution Approach 1:
The ground structure is segmented into distinct regions: a continuous ground in areas requiring shielding, and a ground isolation structure with ground wirings in areas where coupling interference occurs. This segmentation allows the ground to provide electrical shielding where needed while creating isolation barriers in regions where continuous grounding would cause harmful coupling between metal layers.
Solution Approach 2:
Different ground configurations are applied to different locations based on local requirements. In regions where electrical shielding is the priority, continuous ground is used. In regions where coupling interference is the concern, particularly near signal wirings and antenna connections, the ground isolation structure with separated ground wirings is applied to minimize electric field interference.
Data Source
AI summary
A circuit board for an antenna according to an embodiment includes a core layer having a first surface and second surface that face each other, a second conductive layer disposed on the second surface of the core layer, and a first conductive layer disposed on the first surface of the core layer. The first conductive layer includes signal wirings, and a co-planar ground spaced apart from the signal wirings in a horizontal direction. The co-planar ground includes a first recess formed between end portions of neighboring signal wirings of the signal wirings.