Reconfigurable Leaky Wave Antenna Beam Steering
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Solution Overview
Problem
Leaky wave antennas are unable to dynamically control the direction of their main beam at fixed frequencies, limiting their application beyond frequency scanning capabilities.
Innovation Solution
A microstrip leaky wave antenna system with a control module and switches that selectively connect impedance components to a ground plane, allowing for dynamic adjustment of the main beam direction by changing the phase constant of the propagating wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating frequency is changed to control the main beam direction, then the beam direction can be adjusted, but the frequency must be changed which limits applications requiring fixed frequency operation
Solution Approach 1:
The patent changes the impedance parameter along the microstrip line by selectively connecting impedance components to the ground plane through switches. This modifies the propagation constant's real part, thereby controlling the beam direction without changing the operating frequency, resolving the contradiction between beam control and fixed frequency operation
Solution Approach 2:
The patent introduces dynamically controllable switches that can selectively connect or disconnect impedance components along the microstrip line. This dynamic reconfiguration allows the antenna to adapt its beam direction in real-time while maintaining fixed frequency operation, enhancing both operability and versatility
2Ease of operation
If impedance components are added to control beam direction, then beam direction control is achieved, but device complexity increases
Solution Approach 1:
The patent divides the continuous microstrip line into segments by placing discrete impedance components at specific locations along the line. Each segment can be independently controlled by switches, allowing beam direction control through selective activation of segments rather than modifying the entire structure
Solution Approach 2:
The patent introduces switches as intermediary elements between the impedance components and the ground plane. These switches act as mediators that selectively connect or disconnect impedance components, enabling beam control without permanently altering the antenna structure and reducing overall system complexity
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
Enables the antenna to produce main beams at user-selectable angles while maintaining a fixed frequency, enhancing its applicability by improving gain, suppressing backlobes, and optimizing impedance matching.
Implementation Method 1
A microstrip leaky wave antenna radiates energy from a microstrip line on top of a dielectric substrate. The principle of this antenna is that a wave guided by the microstrip will 'leak' or produce a radiated field within a certain frequency range.
Implementation Method 2
A switch is electrically connected between each one of the plurality of impedance components and the ground plane. A control module coupled to the plurality of switches operates to specify a direction of a main beam radiating from the microstrip by selectively connecting one or more of the plurality of impedance components to the ground plane.
Data Source
AI summary
A leaky wave antenna system is set forth. The antenna comprises: a microstrip fabricated on a top surface of a substrate; a ground plane formed on a bottom surface of the substrate; and a plurality of impedance components, each impedance component having one terminal electrically coupled to a lengthwise edge of the microstrip abutting the top surface of the substrate. A switch is electrically connected between each one of the plurality of impedance components and the ground plane. A control module coupled to the plurality of switches operates to specify a direction of a main beam radiating from the microstrip by selectively connecting one or more of the plurality of impedance components to the ground plane.