Stacked Microstrip Antenna Air Cavity Separator
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Solution Overview
Problem
Existing stacked microstrip antennas face complex and costly manufacturing processes due to temperature and pressure sensitivity of HF foam materials used for weak electromagnetic coupling, which is essential for wide impedance bandwidth, and require specialized materials and designs.
Innovation Solution
Introducing air cavities into a separator between the patch elements, made from conventional high dielectric constant materials like RO 4003, reduces the effective dielectric constant and electromagnetic coupling, allowing for cost-effective standard PCB processes and robust broadband antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HF foam materials are used as separator to achieve weak electromagnetic coupling and wide impedance bandwidth, then the electromagnetic coupling between patch elements is reduced, but the manufacturing process becomes complicated and expensive due to temperature and pressure sensitivity
Solution Approach 1:
The patent introduces air cavities (porous structure) into the separator material to reduce its effective dielectric constant. This allows the use of standard PCB materials instead of sensitive HF foams, achieving weak electromagnetic coupling through the porous structure while maintaining manufacturing simplicity and cost-effectiveness.
Solution Approach 2:
The patent changes the dielectric parameter of the separator by introducing air cavities, which significantly reduces the effective dielectric constant from typically high values (e.g., 3.38 for RO4003) to lower values suitable for wide bandwidth operation. This parameter modification enables the use of standard materials with otherwise suboptimal dielectric properties.
2Ease of manufacture
If conventional HF printed circuit board materials with high dielectric constant are used for the separator, then manufacturing becomes simpler and more cost-effective, but electromagnetic coupling between patch elements increases, reducing impedance bandwidth
Solution Approach 1:
The patent applies porous materials (separator with air cavities) to reduce the effective dielectric constant of conventional PCB materials. This allows standard materials to achieve the low dielectric constant needed for wide bandwidth while maintaining the manufacturing simplicity and cost-effectiveness of standard PCB processes.
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 approach enables the production of cost-effective, broadband antennas with increased impedance bandwidth using standard materials and processes, suitable for various applications including 3D T/R modules and circularly polarized antennas across a wide frequency range.
Implementation Method 1
the electromagnetic coupling of the two superimposed microstrip antenna elements must be weak so that a wide impedance bandwidth can be achieved
Implementation Method 2
such foams have a low dielectric constant εr... the necessary adjustment is made by the cavities introduced into the separator, which significantly reduce the effective dielectric constant between the patch elements
Data Source
AI summary
The invention relates to a stacked microstrip antenna, comprising two microstrip antenna elements (1, 10) arranged one above the other and a dielectric separator (5) between the two microstrip antenna elements (1, 10), wherein the dielectric separator (5) has one or more cavities (20).