Slotted Microstrip Antenna Ground Plane for Detuning Resistance
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Solution Overview
Problem
Microstrip antennas face challenges in maintaining performance and controlling radiation pattern characteristics as their size is reduced, leading to frequency de-tuning when placed on different ground planes, and there is a need for a design that can optimize front-to-back ratio without increasing overall size or cost.
Innovation Solution
The antenna assembly incorporates a ground plane with slots and a patch antenna arranged in parallel, where the slots on the ground plane and patch antenna help in reducing de-tuning and enhancing the front-to-back ratio, allowing the antenna to maintain performance across various ground planes without significant size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ground plane size is increased to improve front-to-back ratio, then the radiation pattern control is improved, but the overall antenna size and cost increase
Solution Approach 1:
The ground plane is segmented by introducing slots that divide the continuous conductive surface into separated regions. This segmentation allows the ground plane to maintain electrical effectiveness for radiation pattern control while reducing the physical area and material required, thereby improving front-to-back ratio without proportionally increasing size and cost
2Ease of manufacture
If the antenna size is reduced to decrease cost and improve integration, then the manufacturing cost is reduced, but frequency de-tuning occurs when placed on different ground planes
Solution Approach 1:
The slots are strategically positioned and dimensioned to locally modify the electromagnetic field distribution and coupling characteristics. This local modification compensates for variations in external ground plane conditions, allowing the compact antenna to maintain stable frequency response across different mounting configurations without requiring full-size ground planes
3Volume of moving object
If the ground plane is made electrically small to reduce overall antenna size, then the integration is improved, but the coupling with external ground planes causes frequency shift
Solution Approach 1:
The slots act as intermediary structures that mediate the coupling between the compact ground plane and external ground planes. By controlling the electromagnetic interaction through these slot structures, the antenna assembly achieves size reduction while the slots provide a buffering effect that stabilizes frequency response against external ground plane variations
Data Source
AI summary
An antenna assembly is disclosed including a ground plane having a first longitudinal edge and a second longitudinal edge. The first and second longitudinal edges may extend in a longitudinal direction and may be spaced apart in a lateral direction that is perpendicular to the longitudinal direction. The ground plane may define a first plurality of slots that are open to the first longitudinal edge and a second plurality of slots that are open to the second longitudinal edge. The antenna assembly may also include a patch antenna spaced apart from the ground plane and arranged in parallel with the ground plane. The patch antenna may have a pair of opposite edges and may define a first plurality of slots that are open to one of the pair of opposite edges of the patch antenna. In some embodiments, the antenna assembly may include one or more parasitic elements that also define a plurality of slots.