Patch Antenna Array Resonators for Close-Spaced Isolation
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Solution Overview
Problem
Existing antenna arrays face challenges in achieving reduced size and maintaining adequate isolation and angular range for angle-of-arrival (AoA) measurements, particularly in devices with smaller form factors, such as IoT devices and RedCap devices, due to the need for half-wavelength spacing between elements.
Innovation Solution
Incorporating resonator elements, such as semi-closed loop structures formed by S-shaped conductors, between patch antenna elements to trap electromagnetic fields and reduce coupling, allowing for closer element spacing while maintaining isolation and operational performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna elements are spaced at half-wavelength distance to maintain isolation, then isolation between elements is preserved, but antenna array size increases
Solution Approach 1:
A resonator element is introduced as an intermediary component positioned between adjacent patch antenna elements. This resonator acts as a mediator that actively manages electromagnetic field interactions, trapping and containing fields within its structured geometry (comprising S-shaped conductors in orthogonal orientations). By placing this intermediary resonator structure between the antenna elements, the patent achieves enhanced isolation without requiring increased spacing, thus resolving the contradiction between maintaining isolation and minimizing array size
Solution Approach 2:
The resonator element modifies the electromagnetic parameters in the space between antenna elements by creating a resonant structure with specific geometric parameters (S-shaped conductor configurations). This changes the effective electromagnetic environment, creating field confinement that increases isolation. By altering the electromagnetic field distribution through the resonator's geometric parameters rather than changing physical spacing, the patent achieves improved isolation while maintaining compact array dimensions
2Area of stationary object
If antenna elements are placed closer together to reduce device size, then device form factor is reduced, but coupling between elements increases
Solution Approach 1:
The resonator element serves as a protective intermediary that blocks harmful electromagnetic coupling between closely spaced antenna elements. By positioning the resonator between adjacent elements, it creates an electromagnetic barrier that prevents field leakage and mutual coupling. This allows the antenna elements to be placed at reduced spacing (smaller than half-wavelength) while the resonator mediator prevents the harmful coupling effect from occurring
Solution Approach 2:
The resonator structure converts the potentially harmful electromagnetic fields that would cause coupling into a beneficial confined field pattern. By designing the resonator with specific resonant frequencies and geometric configurations (orthogonal S-shaped conductors), it traps and contains the electromagnetic energy that would otherwise couple between elements. The harmful field leakage is transformed into a controlled, confined field distribution that actually enhances isolation while enabling closer element spacing
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
The resonator elements enable a reduction in antenna array size while preserving isolation levels and angular range accuracy, facilitating smaller form factor devices with improved AoA measurement capabilities.
Implementation Method 1
The resonator elements may include non-closed (i.e., semi-closed) loop structures configured to resonate at the operational frequency of the antenna array.
Implementation Method 2
disposing, on or in the dielectric substrate and between each of the plurality of patch antenna elements, a plurality of resonator elements configured to form a plurality of semi-closed loops to trap electromagnetic fields and reduce coupling between the plurality of patch antenna elements
Data Source
AI summary
Techniques are provided for improving antenna isolation and angle-of-arrival (AoA) performance of an antenna array. An example antenna array includes a plurality of patch antenna elements disposed on a planar substrate, and one or more resonator elements disposed on the planar substrate and between each of the plurality of patch antenna elements, wherein each of the one or more resonator elements includes a first repeating S-shaped conductor in a first orientation, and a second repeating S-shaped conductor in a second orientation that is rotated 180 degrees relative to the first orientation.