Antenna Array Directivity Optimization via Modal Control
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Solution Overview
Problem
Existing antenna arrays face limitations in achieving high directivity while maintaining compactness, as conventional methods increase size and are constrained by the directivity of ideal Huygens sources.
Innovation Solution
A method involving a matrix calculation-based approach to determine an antenna array's excitation vector and load parameters, using spherical modes and loads with distinct components like resistance and capacitance or inductance, to optimize electromagnetic wave generation and radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflectors such as parabolas are used to increase directivity, then directivity is improved, but the size of the antenna array greatly increases
Solution Approach 1:
The patent changes the fundamental operating parameters by jointly exciting both TE and TM radiation modes within the same antenna array structure, enabling directivity enhancement through modal control rather than physical size expansion. This parameter-based approach allows achieving high directivity in a compact configuration.
Solution Approach 2:
The antenna array is designed to perform multiple functions simultaneously: it supports both TE and TM mode excitations, enabling it to achieve high directivity while maintaining compact dimensions. This multi-functional capability replaces the need for separate reflector structures.
2Illumination intensity
If the directivity of an antenna array is increased using conventional methods, then directivity is improved, but the complexity of the antenna structure increases
Solution Approach 1:
The patent merges the TE and TM mode excitations within a single antenna array structure, eliminating the need for separate antenna systems or complex reflector networks. This consolidation reduces structural complexity while achieving enhanced directivity through coordinated modal operation.
3Area of stationary object
If an ideal Huygens source structure is used, then the antenna size is reduced, but the maximum directivity is limited to 4.7 dBi
Solution Approach 1:
The patent introduces dynamic control over the radiation characteristics by independently adjusting the excitation levels of TE and TM modes. This dynamic modal control enables the antenna to adapt its radiation pattern and achieve directivity beyond the static 4.7 dBi limit of ideal Huygens sources, while maintaining compact size.
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 method enables the creation of an antenna array with improved directivity and compactness, allowing for directional radiation patterns and flexible impedance adjustments, enhancing performance in various applications such as cellular telephony and radiocommunications.
Implementation Method 1
Each circuit antenna of the array antenna is capable of generating an electromagnetic wave
Data Source
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Figure 4
AI summary
The invention relates to a method for determining an antenna array (10) suitable for generating an electromagnetic wave comprising: - at least one antenna (14, 16, 18), - at least one circuit (19) having parameters (Z) influencing the electromagnetic wave generated by the antenna array (10) and connected to at least one antenna (16, 18), the method comprising the steps of: - choosing a criterion to be verified, - determining desired decomposition coefficients of a wave in a basis allowing the chosen criterion to be met, - calculating the parameters (Z) for each circuit (19) of the antenna array (10) so that the difference between the decomposition coefficients on the basis of the wave generated by the antenna array (10) and the desired decomposition coefficients is minimal.