Discrete Antenna Module Via Wall Ground Isolation
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Solution Overview
Problem
Current wireless devices face challenges in efficiently supporting multiple millimeter-wave (MMW) frequency bands with phased array antennas, leading to increased module size and cost, as well as reduced antenna gain and cross-polarization levels, which are critical for MIMO operations.
Innovation Solution
The implementation of via wall structures in antenna modules to strengthen the ground condition, isolate individual modules, and improve coupling between ports, thereby enhancing antenna gain and cross-polarization levels for multi-band MMW operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via wall structures are added to strengthen ground condition and isolate modules, then antenna gain and cross-polarization levels are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The ground plane is segmented into multiple isolated ground regions by the via wall structures, which divide the continuous ground into discrete sections. This segmentation creates electromagnetic isolation between adjacent antenna elements while maintaining proper ground references, thereby improving cross-polarization levels and antenna gain without requiring a complete redesign of the entire ground structure.
Solution Approach 2:
The via wall structures serve as intermediary elements between the ground plane and the antenna radiating elements. These vertical via structures act as electromagnetic barriers that mediate the interaction between adjacent antenna elements, providing isolation and improving cross-polarization performance while maintaining a relatively simple overall module architecture.
2Adaptability or versatility
If multiple millimeter-wave frequency bands are supported with phased array antennas, then multi-band performance is achieved, but module size and cost increase
Solution Approach 1:
The via wall structures provide multiple functions simultaneously: they serve as ground references for antenna elements, act as electromagnetic isolation barriers between adjacent elements, and function as part of the phased array feeding network. This multi-functionality enables support for multiple millimeter-wave frequency bands without proportionally increasing module size, as the same structural elements serve multiple purposes across different frequency ranges.
Solution Approach 2:
The antenna module employs a nested configuration where multiple patches operating at different frequency bands are stacked vertically and horizontally within the same module footprint. The via wall structures are integrated into this nested arrangement, providing isolation and ground references for all nested elements, thereby achieving multi-band support without linearly increasing the overall module area.
3Reliability
If via spacing is optimized for different frequency ranges, then antenna performance across bands is improved, but manufacturing precision requirements increase
Solution Approach 1:
The via wall structures utilize controlled parameter variations, specifically adjusting via spacing and via diameter based on the target frequency range. For lower millimeter-wave frequencies, larger via spacing is employed, while higher frequencies use tighter spacing. This parameter optimization improves antenna performance across different bands while the via wall structure provides a forgiving geometry that tolerates moderate manufacturing variations better than more complex ground structures would.
Data Source
AI summary
Techniques are provided for improving the performance of a multi-band antenna in a wireless device. An example wireless device includes at least one radio frequency integrated circuit, and at least one patch antenna operably coupled to the at least one radio frequency integrated circuit, including a first patch operably coupled to the at least one radio frequency integrated circuit, a ground plane disposed below the first patch, and a plurality of via wall structures disposed around the first patch, wherein each of the plurality of via wall structures is electrically coupled to the ground plane.