Slot Array Antenna Phase Control via Aperiodic Waveguide Dents
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Solution Overview
Problem
Conventional slot array antennas face challenges in achieving proper radiation and efficient signal transmission at high frequencies due to dielectric loss in microstrip lines and the difficulty in densely packing antenna elements with hollow waveguides, while existing ridge waveguide structures struggle to adjust signal phase for desired antenna characteristics.
Innovation Solution
A slot array antenna design incorporating a ridge-type waveguide with artificial magnetic conductors, featuring aperiodic distributions of bumps and dents on the waveguide face to adjust capacitance and inductance, allowing for phase adjustments and improved radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microstrip line is used to feed antenna elements, then the structure is simple and easy to manufacture, but dielectric loss increases significantly at high frequencies (above 30 GHz)
Solution Approach 1:
The patent replaces the microstrip line feeding structure with a waveguide-based feeding structure. The waveguide uses electromagnetic wave propagation in a hollow metallic structure instead of guided waves on a dielectric substrate, eliminating dielectric loss while maintaining structural integrity and manufacturability through precision machining of metallic components.
Solution Approach 2:
The patent employs a hybrid feeding structure that combines waveguide sections for high-frequency signal transmission with metallic cavity structures. This composite approach uses the advantageous properties of metallic waveguides (low loss at high frequencies) while integrating them with antenna element structures to achieve both low loss and ease of assembly.
2Loss of energy
If a hollow waveguide is used to feed antenna elements, then dielectric loss is eliminated at high frequencies, but the spacing between antenna elements increases reducing array density
Solution Approach 1:
The patent integrates the feeding waveguide structure within or alongside the antenna element cavity structure. The waveguide for feeding one antenna element is nested within the same structural envelope that houses the radiating element, allowing the feed and radiate functions to occupy overlapping spatial volumes rather than requiring separate lateral space.
Solution Approach 2:
The patent transitions from a planar two-dimensional array layout to a three-dimensional configuration where feeding and radiating structures utilize the vertical dimension. By stacking waveguide feeds and antenna elements in multiple layers or levels, the system achieves high element density without increasing the lateral spacing between elements.
3Device complexity
If a conventional ridge waveguide is used, then the structure is simple, but the phase of electromagnetic waves cannot be adjusted for desired antenna characteristics
Solution Approach 1:
The patent introduces localized reactive loading elements (inductive posts or capacitive irises) at specific positions within the waveguide structure. These local modifications create controlled phase shifts at particular locations along the waveguide without requiring complex overall restructuring, allowing precise phase control for beamforming while maintaining structural simplicity.
Solution Approach 2:
The patent employs adjustable reactive loading elements whose electrical parameters (inductance or capacitance) can be varied to control the phase of electromagnetic waves. By changing these parameters, the phase shift introduced by each loading element can be tuned to achieve desired beam directions and antenna patterns without altering the physical geometry of the waveguide itself.
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 proper radiation and efficient signal transmission at high frequencies by adjusting the phase of electromagnetic waves, allowing for equiamplitude and equiphase excitation of antenna elements and improved antenna characteristics such as gain and directivity.
Implementation Method 1
In the interior of a hollow waveguide, an electromagnetic field mode which is adapted to the shape and size of the body is created. For this reason, an electromagnetic wave is able to propagate within the body in a certain electromagnetic field mode.
Implementation Method 2
At least one of the electrically conductive member and the waveguide member includes a plurality of bumps on the electrically conductive surface and/or the waveguide face, the plurality of bumps each serving to narrow a spacing between the electrically conductive surface and the waveguide face
Implementation Method 3
the plurality of bumps include a first bump, a second bump, and a third bump which are adjacent to one another and consecutively follow along the first direction. A distance between centers of the first bump and the second bump is different from a distance between centers of the second bump and the third bump
Data Source
AI summary
A slot array antenna includes: an electrically conductive member having an electrically conductive surface and slots therein, the slots being arrayed in a first direction which extends along the conductive surface; a waveguide member having an electrically conductive waveguide face which opposes the slots and extends along the first direction; and an artificial magnetic conductor extending on both sides of the waveguide member. At least one of the conductive member and the waveguide member includes dents on the conductive surface and/or the waveguide face, the dents each serving to broaden a spacing between the conductive surface and the waveguide face relative to any adjacent site. The dents include a first, second, and third dents which are adjacent to one another and consecutively follow along the first direction. A distance between centers of the first and second dents is different from a distance between centers of the second and third dents.