Shared-Aperture PCB Antenna Layout for Dual-Band Isolation
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Solution Overview
Problem
Dual-band shared aperture antennas face challenges such as mutual interference, non-compact design, and performance degradation due to wall proximity, making them cost-prohibitive for commercial applications.
Innovation Solution
A dual-band shared aperture antenna design that integrates a patch-antenna on the front side and a slot-antenna on the rear side of a PCB, with a metal cavity for electromagnetic coupling, hedges for isolation, and a compact metallic cavity for shielding, eliminating mutual interference and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-band shared aperture antenna is implemented, then two frequency bands can operate in the same aperture, but mutual interference between antennas occurs
Solution Approach 1:
The patent divides the single aperture into two separate radiating structures: a patch antenna for 2.4 GHz operation and a slot antenna for 915 MHz operation. These segmented antenna elements are positioned at different locations within the aperture structure, allowing dual-band functionality while reducing mutual interference through spatial separation.
Solution Approach 2:
The patent introduces a dielectric substrate as an intermediary layer between the patch antenna and slot antenna. This dielectric material acts as a mediator that isolates the two antenna types electromagnetically while maintaining their respective operating frequencies, thereby reducing mutual interference.
2Adaptability or versatility
If traditional dual-band antenna design is used, then frequency coverage is achieved, but the antenna dimensions become non-compact
Solution Approach 1:
The patent merges the 2.4 GHz patch antenna and 915 MHz slot antenna into a single integrated aperture structure mounted on a PCB. By combining both antenna types within one compact housing and utilizing the PCB as the mounting platform, the design achieves dual-band coverage without requiring separate antenna assemblies, thus maintaining compact dimensions.
Solution Approach 2:
The patent utilizes the third dimension (depth/z-axis) by positioning the patch antenna on the front side of the PCB and the slot antenna on the rear side. This dimensional arrangement allows both antennas to coexist in a compact footprint while maintaining their respective radiation patterns and frequency operations.
3Ease of manufacture
If wall-mounted installation is used, then commercial deployment is facilitated, but antenna performance degrades due to proximity to wall
Solution Approach 1:
The patent positions the patch antenna and slot antenna at specific locations within the aperture structure, optimized for wall-mounted installation. The antennas are arranged to maximize separation from the wall surface and from each other, with the patch antenna on the front face and slot antenna on the rear face, creating local quality variations in the radiation pattern that maintain performance despite proximity to the mounting surface.
4Ease of manufacture
If cost reduction is pursued, then commercial applicability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the PCB as a multi-functional platform that serves as the mounting structure for both antennas, the ground plane for RF signals, and the mechanical support for the entire aperture assembly. This universal use of the PCB reduces the need for additional components and assembly steps, lowering manufacturing costs while maintaining consistent electrical and mechanical properties.
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
Achieves efficient dual-frequency operation with reduced size and improved performance, eliminating interference and shielding from environmental disturbances, suitable for commercial applications.
Implementation Method 1
a metal cavity connected to the rear side of the PCB, wherein the metal cavity is electromagnetically coupled with the slot antenna
Implementation Method 2
the metal cavity facilitates shaping the antenna's radiation pattern direction, and providing shielding from disturbances behind the antenna
Implementation Method 3
the slot antenna comprises a meandered slot to increase the slots length and, consequently, reduce the overall antenna size
Data Source
AI summary
According to a first aspect of the present disclosed subject matter, a dual-band shared aperture antenna (2BSA Antenna) comprising: a patch-antenna disposed on a front side of a printed circuit board (PCB); a slot-antenna disposed on a rear side of the PCB; and a metal cavity connected to the rear side of the PCB, wherein the metal cavity is electromagnetically coupled with the slot antenna.