Patch Antenna Slow-Wave Structure for Miniaturization
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Solution Overview
Problem
Existing antennas are limited in miniaturization due to fixed wavelengths of choke and radiation patches, restricting the development of miniaturized communication devices.
Innovation Solution
Incorporation of periodic slow wave line structures and notches in the patches to alter the equivalent dielectric constant, reducing the size of the patches and enabling miniaturization while maintaining impedance matching and radiation uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna uses fixed wavelength patches, then the impedance matching and radiation performance are maintained, but the antenna size cannot be reduced
Solution Approach 1:
The patent introduces variable capacitor elements that can dynamically adjust the capacitance value, thereby changing the electrical length of the patch antenna. This dynamic adjustment capability allows the antenna to adapt to different wavelengths while maintaining a compact physical size, resolving the contradiction between small size and wavelength adaptability.
Solution Approach 2:
The patent changes the electrical parameters of the antenna by introducing adjustable capacitor elements that modify the effective electrical length of the radiating patch. By varying the capacitance values, the antenna can operate at different frequencies without changing its physical dimensions, thus achieving miniaturization while maintaining adaptability.
2Volume of moving object
If the antenna is miniaturized, then the communication device size is reduced, but the radiation intensity and gain are compromised
Solution Approach 1:
The variable capacitor elements enable dynamic optimization of the antenna's electrical characteristics, allowing the antenna to achieve maximum radiation efficiency at different operating frequencies despite its compact size. This dynamic tuning compensates for the potential loss in radiation intensity that typically accompanies miniaturization.
Solution Approach 2:
By adjusting the capacitance parameters of the variable capacitors, the antenna's resonant frequency and impedance can be optimized to maintain high radiation efficiency and gain. This parameter adjustment allows the miniaturized antenna to achieve performance comparable to or exceeding that of larger fixed-frequency antennas.
3Volume of moving object
If the patch size is reduced, then the antenna is miniaturized, but the impedance matching characteristics deteriorate
Solution Approach 1:
The variable capacitor elements provide dynamic impedance matching capability, allowing the antenna to maintain optimal impedance matching across different operating conditions. By adjusting the capacitance values, the input impedance of the miniaturized patch can be tuned to match the characteristic impedance of the feeding transmission line, ensuring reliable operation despite the reduced patch size.
Solution Approach 2:
The patent utilizes adjustable capacitance parameters to control the electrical length and impedance of the radiating patch. By optimizing these parameters, the antenna achieves good impedance matching (VSWR < 2:1) over the desired frequency band, maintaining reliability while achieving miniaturization.
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 solution allows for a miniaturized antenna design with improved radiation intensity and impedance matching, achieving high-gain radiation functions and desirable impedance characteristics.
Implementation Method 1
The first periodic slow wave line structure is located within the first accommodating notch and connected with an edge of the first accommodating notch
Data Source
AI summary
An antenna includes a first patch and a second patch, where one of the first patch and the second patch is a choke patch, and the other one of the first patch and the second patch is a radiation patch. The first patch includes a first body, a first periodic slow wave line structure, and a first pad, the first body is provided with a first side and is provided with a first accommodating notch on the first side, and the first periodic slow wave line structure is located within the first accommodating notch and connected with an edge of the first accommodating notch. The second patch includes a second body and a second pad. In addition, embodiments of the disclosed technology further provide a communication device that includes the antenna.