Dual-Band Phased Antenna Array Behind Dielectric Cover
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Solution Overview
Problem
Electronic devices face challenges in supporting millimeter and centimeter wave communications due to substantial attenuation and distortion of signals during propagation, necessitating improved wireless communications circuitry that can efficiently handle these high-frequency bands.
Innovation Solution
The implementation of a phased antenna array with dual-band capabilities, where antennas are arranged on a dielectric substrate and mounted behind a dielectric cover layer, utilizing patch elements and parasitic elements to radiate signals in both millimeter and centimeter wave frequency bands with enhanced efficiency and polarization diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antennas are mounted behind a dielectric cover layer to support millimeter and centimeter wave communications, then wireless communication capabilities in high-frequency bands are enabled, but signal attenuation and distortion increase during signal propagation
Solution Approach 1:
A dedicated dielectric layer is introduced between the antenna and the housing cover, serving as an intermediary component optimized for millimeter wave signal transmission. This layer has controlled dielectric properties that minimize signal attenuation while enabling the antenna to operate effectively behind the housing cover, thus resolving the contradiction between enabling wireless communication and reducing signal loss.
Solution Approach 2:
The dielectric layer's properties (dielectric constant, thickness) are specifically optimized for millimeter wave frequencies. By changing and controlling these parameters, the layer enables efficient signal transmission at high frequencies while minimizing attenuation, allowing the antenna system to achieve both communication capability and acceptable signal loss performance.
2Reliability
If a dielectric cover layer is placed over the antenna, then the antenna can be protected and integrated into the housing, but antenna efficiency decreases due to signal interaction with the dielectric material
Solution Approach 1:
The dielectric layer acts as a specialized intermediary between the antenna and the protective housing structure. Rather than using a generic protective cover, this intermediate layer is engineered with specific electromagnetic properties that allow it to provide mechanical protection while maintaining high antenna efficiency through optimized signal transmission characteristics.
Solution Approach 2:
The dielectric layer is positioned specifically in the region where the antenna operates, providing localized optimization. Its properties are tailored for the specific location and operating conditions of the antenna, enabling both protection and maintained efficiency in the critical radiation zone while the rest of the housing can provide general structural protection.
3Adaptability or versatility
If dual-band antenna elements are designed to operate in both millimeter and centimeter wave bands, then communication versatility is improved, but antenna design complexity increases
Solution Approach 1:
The antenna system is designed with elements that serve multiple frequency bands simultaneously. The same antenna structure and dielectric layer configuration work for both millimeter wave and centimeter wave communications, eliminating the need for separate antenna systems for each band and reducing overall design complexity despite the dual-band requirement.
Solution Approach 2:
The antenna system is divided into distinct elements (first patch element for millimeter wave, second patch element for centimeter wave) that can be independently optimized yet work together through the common dielectric layer. This segmentation allows each element to be designed for its specific band while sharing the same protective and functional infrastructure, reducing complexity compared to a fully integrated dual-band element.
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 configuration allows for satisfactory antenna efficiency and polarization diversity across multiple frequency bands, minimizing signal attenuation and distortion, and optimizing performance despite the presence of dielectric cover layers, thereby enhancing wireless communication capabilities in electronic devices.
Implementation Method 1
The first patch element may radiate first radio-frequency signals in a first frequency band through the dielectric cover layer
Implementation Method 2
The slot element may radiate second radio-frequency signals in a second frequency band that is higher than the first frequency band through the dialectic layer
Implementation Method 3
millimeter wave communications signals generated by antennas can be characterized by substantial attenuation and/or distortion during signal propagation through various mediums
Data Source
AI summary
An electronic device may be provided with a cover layer and a phased antenna array mounted against the cover layer. Each antenna in the array may include a first patch element that is directly fed using first and second feeds and a second patch element that is directly fed using third and fourth feeds. A slot element may be formed in the first patch element. The first patch element may radiate in a first frequency band through the cover layer. The slot element may radiate in a second frequency band that is higher than the first frequency band through the cover layer. The second patch element may indirectly feed the slot element. Locating the radiating elements for each frequency band in the same plane may allow the antenna to radiate through the cover layer in both frequency bands with satisfactory antenna efficiency.