Switchable Patch Antenna Impedance Control for Mutual Coupling
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Solution Overview
Problem
Patch antennas in close proximity experience mutual coupling issues, affecting their performance and increasing costs, especially in high-gain array and holographic metasurface antenna applications.
Innovation Solution
A switchable patch antenna design with variable impedance components allows for controlled radiation of sinusoidal signals by comparing impedance values, enabling or disabling radiation based on the impedance levels of two coupled components, and using switches to adjust impedance values to achieve desired radiation patterns and phase shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple patch antennas are located closely together to shape and steer beams, then beam shaping and steering capability is improved, but mutual coupling between antennas increases
Solution Approach 1:
The patent applies dynamics by making the antenna impedance state switchable between radiating and non-radiating modes. The switchable patch antenna uses electronically controllable switches to dynamically adjust the impedance of patch elements, allowing the array to adapt its radiation characteristics while maintaining close spacing for beam shaping and steering without suffering from mutual coupling interference.
Solution Approach 2:
The patent changes the impedance parameter of the patch antenna elements to control radiation. By switching the impedance state of individual patch elements between matched and mismatched conditions, the antenna array can shape and steer beams while preventing mutual coupling between closely spaced elements, thus resolving the technical contradiction.
2Device complexity
If patch antennas are placed in close proximity, then device complexity is reduced, but performance deteriorates due to mutual coupling
Solution Approach 1:
The switchable impedance mechanism allows the antenna array to dynamically control which elements are active or inactive. This dynamic control enables the system to maintain simple close-spaced geometry while preventing mutual coupling interference by selectively deactivating elements, thus preserving performance without increasing complexity.
Solution Approach 2:
The impedance switching mechanism acts as an intermediary between the closely spaced antenna elements. By controlling the impedance state of individual elements, it mediates the interaction between neighboring antennas, preventing harmful mutual coupling while maintaining the simple physical layout.
3Measurement precision
If switches are used to adjust impedance values, then radiation control precision is improved, but device complexity increases
Solution Approach 1:
The patent uses switches to change the impedance parameter of patch antenna elements between two distinct states: a first impedance value that enables radiation and a second impedance value that prevents radiation. This binary parameter change provides precise radiation control with relatively simple switching components, achieving high control precision without excessive complexity.
Data Source
AI summary
A switchable patch antenna comprises a planar conductor having an aperture (hole) formed in the middle of the planar conductor. Radiation of a sinusoidal signal is controlled by comparison of separate impedance values for two components that have separate impedance values. Each of the two components have one end coupled together at the terminal positioned at a center of the aperture and their other ends separately coupled to opposing edges of the aperture. A sinusoidal signal source is also coupled to the terminal positioned at the aperture's center. Further, when the impedance values of both components are substantially equivalent, radiation by the antenna of the provided signal and/or mutual coupling of other signals is disabled. Also, when an impedance value of one of the two components is substantially greater than the other impedance value of the other component, the provided signal is radiated and/or mutual coupling is enabled.