Metasurface Aperture Antenna Isolation Using EBG Structures
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Solution Overview
Problem
The effective control of electromagnetic energy leakage between adjacent cells in large metasurface phased arrays is a key challenge that degrades system performance and efficiency.
Innovation Solution
Strategically placing two vias in the middle of each slot within a metasurface-PCB to reduce electromagnetic energy leakage, combined with electromagnetic bandgap structures between RF radiating antenna elements and using a superstrate for enhanced radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If adjacent RF radiating antenna elements are placed close together in a metasurface array, then the array size is reduced and beam steering capability is improved, but electromagnetic energy leakage between adjacent cells increases degrading system performance
Solution Approach 1:
Electromagnetic bandgap (EBG) structures are introduced as intermediary elements positioned between adjacent RF radiating antenna elements. These EBG structures act as mediators that block electromagnetic energy leakage while allowing the antenna elements to be closely spaced for compact array design and effective beam steering operation
Solution Approach 2:
The patent applies local quality by making each antenna element unique through selective loading with EBG structures. Not all elements have identical configurations - some elements have EBG structures on one side, others on different sides, creating local variations that suppress leakage in specific directions while maintaining overall array functionality for beam steering
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
This approach effectively minimizes leakage, improves isolation, and enhances the performance of metasurface phased arrays, making them more accessible, affordable, and scalable for advanced beam steering capabilities.
Implementation Method 1
The metasurface includes a plurality of electromagnetic bandgap (EBG) structures, with a least one of the plurality of EBG structures being located between each pair of RF radiating antenna elements of the plurality of RF radiating antenna elements
Implementation Method 2
Metasurface antennas may comprise metamaterial antenna elements that can selectively couple energy from a feed wave to produce beams that may be controlled for use in communication
Implementation Method 3
Each of the RF antenna elements includes at least one tunable iris formed in a first metal layer, at least one substrate layer coupled a first side of the first metal layer, a superstrate coupled to a second side of the first metal layer, and a tuning element coupled to the first metal layer through the superstrate
Data Source
AI summary
An antenna having a plurality of RF radiating antenna elements (e.g., resonators) that include a double layer iris and methods of using the same are disclosed. In some embodiments, an antenna includes: a metasurface having a plurality of RF radiating antenna elements; and a plurality of electromagnetic bandgap (EBG) structures, with a least one of the plurality of EBG structures being located between each pair of RF radiating antenna elements of the plurality of RF radiating antenna elements. In some other embodiments, the antenna includes a metasurface structure having a plurality of RF radiating antenna elements. Each of the RF antenna elements includes at least one tunable iris formed in a first metal layer, at least one substrate layer coupled a first side of the first metal layer, a superstrate coupled to a second side of the first metal layer, and a tuning element coupled to the first metal layer through the superstrate.