Aperture-Coupled Array Antenna Beam Steering
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Solution Overview
Problem
Series-fed phased array antennas face challenges in maintaining beam direction stability as frequency changes, leading to inefficiencies and increased manufacturing costs due to signal loss and complex feed network designs, especially in high-gain applications.
Innovation Solution
A series-fed phased array antenna design featuring three layers: a first substrate with radiating elements, a second substrate with a feedline, and a third layer with a ground plane and aperture slot, allowing for electronic beam steering by varying frequencies without phase shifters or mechanical devices, and reducing parasitic radiation through aperture coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a parallel feed network is used, then the beam direction is fixed, but the overall length of the feed network increases causing signal loss and reduced transmission efficiency
Solution Approach 1:
The antenna array is divided into multiple independently controllable antenna elements, each fed through separate transmission lines from a power divider network. This segmentation allows selective activation of elements to maintain beam direction while reducing the effective feed network length and signal loss.
Solution Approach 2:
The patent transitions from a planar parallel feed network to a three-dimensional hierarchical structure with vertical stacking of antenna elements and layered feed networks. This dimensional change reduces the horizontal feed network length while maintaining beam steering capability through phase control across layers.
2Loss of energy
If a parallel feed network with waveguide is used, then signal transmission is efficient, but the feed network becomes complicated increasing manufacturing difficulty and costs
Solution Approach 1:
The patent replaces complex mechanical waveguide structures with planar transmission lines implemented on PCB substrates. This substitution maintains electromagnetic signal transmission efficiency while dramatically simplifying manufacturing through standard PCB fabrication processes, eliminating the need for precision-machined metal waveguides.
Solution Approach 2:
The feed network design changes the physical state of signal transmission from three-dimensional waveguide modes to two-dimensional microstrip or stripline configurations. This parameter change in transmission geometry reduces manufacturing complexity while maintaining acceptable transmission efficiency through optimized line dimensions and substrate selection.
3Ease of manufacture
If a series feed network is used, then efficiency loss and manufacturing difficulty are reduced, but the phase of electromagnetic waves changes according to frequency change causing beam direction to change
Solution Approach 1:
The patent implements dynamic phase control through independent phase shifters for each antenna element, allowing real-time adjustment of phase relationships to compensate for frequency-induced beam direction changes. This dynamic adaptation maintains stable beam pointing across the operating frequency range while retaining series feed manufacturing simplicity.
Solution Approach 2:
The system changes the controllable parameter from fixed physical geometry to adjustable electrical phase parameters. By dynamically modifying phase parameters through electronic phase shifters, the beam direction remains stable despite frequency variations, while the series feed network maintains its manufacturing advantages.
4Ease of operation
If phase shifters or mechanical devices are used for beam steering, then beam direction can be controlled, but device complexity and cost increase
Solution Approach 1:
The patent integrates multiple functions into unified components: the power divider network simultaneously performs signal distribution and phase control, while the PCB substrate integrates transmission lines, grounding, and mechanical support. This multi-functionality reduces the number of discrete components and overall system complexity compared to dedicated mechanical steering devices.
Solution Approach 2:
The patent replaces mechanical beam steering devices (such as movable reflectors or rotating antennas) with electronic phase control implemented through PCB-based transmission line structures and electronic phase shifters. This substitution eliminates mechanical complexity while achieving precise beam steering through electrical parameter control.
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 design enables efficient beam steering over a wide frequency range, reduces signal loss, and enhances manufacturing simplicity while maintaining high-purity polarization characteristics, effectively addressing the challenges of beam direction stability and manufacturing complexity.
Implementation Method 1
a third layer formed between the first layer and the second layer and including a ground plane and an aperture slot formed through the ground plane
Data Source
AI summary
Disclosed herein is an array antenna in which a plurality of radiating elements is arranged. The array antenna includes: a first layer comprising a first substrate forming an upper portion of the array antenna and a plurality of radiating elements disposed on the first substrate; a second layer comprising a second substrate forming a lower portion of the array antenna and a feedline disposed on the second substrate to supply output power to the plurality of radiating elements; and a third layer formed between the first layer and the second layer and comprising a ground plane and an aperture slot formed through the ground plane.