Switchable Antenna Mode Control via Parasitic Element Reconfiguration
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Solution Overview
Problem
Existing antennas lack the ability to efficiently switch between omnidirectional and directional modes, leading to interference and dead zones in radio-frequency signal transmission and reception.
Innovation Solution
A switchable antenna design featuring a substrate with radiating portions and switch elements that allow the antenna elements to switch between reflector and parasitic radiating modes, enabling operation in both omnidirectional and directional modes by controlling the switch elements to adjust directivity and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an antenna is designed with fixed directivity, then the antenna structure is simple, but the antenna cannot switch between omnidirectional and directional modes
Solution Approach 1:
The patent implements dynamic reconfigurability by using switching elements (such as PIN diodes or FETs) to dynamically change the electrical state of parasitic radiating elements between conducting and non-conducting states. This allows the antenna to switch between omnidirectional and directional modes without physical movement, resolving the contradiction between adaptability and structural complexity.
Solution Approach 2:
The patent changes the electrical parameters (impedance, conductivity, resonant frequency) of parasitic radiating elements through voltage-controlled switching elements. By altering the electrical state of these elements between conducting and non-conducting, the antenna radiation pattern can be switched between omnidirectional and directional modes, achieving mode switching without mechanical movement.
2Productivity
If an antenna operates in omnidirectional mode, then coverage is provided in all directions, but transmission efficiency to specific areas is reduced
Solution Approach 1:
The antenna system dynamically reconfigures its radiation pattern by controlling the switching state of parasitic elements. When high transmission efficiency to a specific direction is needed, the system switches to directional mode by activating specific parasitic elements. When omnidirectional coverage is required, the system switches to omnidirectional mode by deactivating these elements, thus dynamically optimizing performance for different operational requirements.
Solution Approach 2:
The antenna system can periodically or on-demand switch between omnidirectional and directional modes based on communication requirements. This periodic reconfiguration allows the system to optimize transmission efficiency for specific directions during data transmission phases while maintaining omnidirectional coverage during scanning or initial connection phases.
3Productivity
If directional antennas are used to increase transmission efficiency, then coverage in specific areas is improved, but dead zones and interference are created
Solution Approach 1:
The system dynamically adjusts the antenna radiation pattern by reconfiguring parasitic elements in real-time. When directional mode is active, specific parasitic elements are activated to focus energy in a particular direction for high transmission efficiency. When omnidirectional mode is activated, these same elements are deactivated to provide uniform coverage and eliminate dead zones, thus dynamically reducing interference patterns.
Solution Approach 2:
By changing the electrical parameters (conductivity, impedance) of parasitic radiating elements through switching elements, the antenna system can transform between omnidirectional and directional radiation patterns. This parameter change allows the system to optimize transmission efficiency for specific directions while minimizing interference and eliminating dead zones by switching to omnidirectional mode when needed.
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 switchable antenna effectively reduces interference and eliminates dead zones by allowing seamless switching between modes, enhancing transmission efficiency and bandwidth while maintaining stable annular current patterns for improved signal quality.
Implementation Method 1
a first switch element electrically connected to the first antenna element and configured to switch the first antenna element between a reflector and a parasitic radiating element
Implementation Method 2
a first switch element electrically connected to the first antenna element and configured to switch the first antenna element between a reflector and a parasitic radiating element
Data Source
AI summary
A switchable antenna includes a substrate, a first antenna element, a second antenna element, a first switch element, a second switch element, a first radiating portion on an upper surface of the substrate including a first center, a first bend section and a second bend section, and a second radiating portion on an lower surface of the substrate including a second center, a third bend section and a fourth bend section. The third and the fourth bend sections extending from the second center are respectively disposed corresponding to the first and the second bend sections extending from the first center. The first and the second antenna elements on the upper surface are disposed corresponding to the first and the second bend sections. The first and the second switch elements are respectively configured to switch the first and the second antenna elements between a reflector and a parasitic radiating element.