Array Antenna Substrate Layout for Wider Bandwidth Return Loss
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Solution Overview
Problem
In array antennas, the limited size of separate substrates due to interference constraints narrows the frequency bandwidth with favorable return loss when a single antenna element is placed on each substrate, making it difficult to secure sufficient area and bandwidth.
Innovation Solution
A configuration where multiple antenna elements are arranged along the polarization directions on each dielectric substrate mounted on a ground substrate, increasing the substrate area and widening the frequency bandwidth with favorable return loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single antenna element is arranged on each of a plurality of separate substrates, then the distance between adjacent antenna elements can be controlled, but the area of each separate substrate is limited and the frequency bandwidth is narrowed
Solution Approach 1:
The antenna device divides the antenna elements into multiple groups, with each group arranged on a separate substrate. This segmentation allows each substrate to be smaller while collectively providing sufficient total area, resolving the contradiction between controlling inter-element distance and securing substrate area.
Solution Approach 2:
The patent transitions from a two-dimensional arrangement (single layer of substrates) to a three-dimensional arrangement (multiple layers of substrates stacked vertically). This dimensional change enables closer spacing of antenna elements while maintaining adequate substrate area through vertical stacking, thereby expanding frequency bandwidth.
2Device complexity
If a single antenna element is arranged on each of a plurality of separate substrates, then the structure is simplified, but the frequency bandwidth with favorable return loss is narrowed
Solution Approach 1:
The antenna device segments antenna elements into multiple groups across separate substrates, maintaining structural simplicity while enabling frequency bandwidth expansion through multi-group arrangement and vertical stacking.
Solution Approach 2:
By stacking substrates vertically in the third dimension, the patent achieves broader frequency bandwidth without increasing the horizontal footprint or complicating the overall structure, thus maintaining simplicity while enhancing adaptability.
3Area of stationary object
If multiple antenna elements are arranged on each separate substrate, then the substrate area is increased and frequency bandwidth is widened, but the distance between adjacent substrates may be reduced
Solution Approach 1:
The patent segments antenna elements into multiple groups distributed across separate substrates, allowing each substrate to have adequate area for its elements while maintaining appropriate spacing between substrates through the segmented arrangement.
Solution Approach 2:
Vertical stacking of substrates in the third dimension enables increased substrate area without necessarily reducing inter-substrate distance, as the stacking configuration allows for optimized spacing in the vertical direction while maintaining horizontal separation.
Data Source
AI summary
An antenna device includes a ground substrate including a ground electrode, and a plurality of separate substrates that are mounted on the ground substrate. Each of the plurality of separate substrates includes a dielectric substrate, and a plurality of antenna elements each of which radiates a radio wave whose polarization direction is an X-axis direction and a radio wave whose polarization direction is a Y-axis direction. The plurality of antenna elements are arranged along the X-axis direction and the Y-axis direction on the dielectric substrate on each of the plurality of separate substrates.