Patch Antenna Cavity Cooling for High-Power Frequency Stability
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Solution Overview
Problem
Conventional patch antennas face issues with high temperatures during high-power operation, leading to degradation of dielectric materials, shifts in resonant frequency, efficiency loss, and thermal expansion, which can cause warping and affect performance.
Innovation Solution
Incorporating a thermally conductive cavity as a heat sink to dissipate thermal energy from the patch, either as a single component or mechanically connected components, allowing the antenna to operate at high power levels while maintaining low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If patch antenna operates at high power levels, then transmission power is improved, but temperature increases causing dielectric degradation and frequency shift
Solution Approach 1:
A thermally conductive cavity is introduced as an intermediary heat dissipation structure between the patch antenna and the environment. The cavity acts as a thermal mediator that conducts heat away from the patch antenna, enabling high power operation without excessive temperature rise. The cavity is mechanically connected to the patch antenna through a thermally conductive support structure, creating an efficient thermal pathway.
Solution Approach 2:
The cavity structure serves multiple functions simultaneously: it acts as a ground plane for electromagnetic shielding, provides mechanical support for the patch antenna, and functions as a heat sink for thermal management. This multi-functionality allows the system to achieve high power operation while maintaining structural integrity and thermal stability.
2Power
If patch antenna operates at high power levels, then transmission power is improved, but dielectric material degrades leading to frequency shift
Solution Approach 1:
The thermally conductive cavity serves as a thermal intermediary that protects the dielectric material from excessive heat. By conducting heat away from the patch and dielectric substrate, the cavity prevents thermal degradation of the dielectric properties, thereby maintaining frequency stability during high power operation.
Solution Approach 2:
The invention changes the thermal parameter (temperature) of the dielectric material by introducing active heat dissipation through the cavity. By controlling the temperature parameter through thermal conduction, the dielectric material's electrical properties remain stable, preventing frequency drift even at high power levels.
3Power
If patch antenna operates at high power levels, then transmission power is improved, but thermal expansion causes warping
Solution Approach 1:
The thermally conductive cavity acts as a thermal mediator that prevents excessive temperature rise in the substrate. By efficiently conducting heat away from the patch antenna and substrate, the cavity minimizes thermal expansion and prevents warping, maintaining the substrate's flat shape during high power operation.
4Temperature
If conventional cooling methods are used, then temperature is reduced, but device complexity increases
Solution Approach 1:
The cavity structure provides passive self-service cooling through its inherent thermal conductivity. The cavity naturally conducts heat away from the patch antenna without requiring external active cooling systems such as fans, pumps, or controlled thermal environments. The mechanical support structure itself serves as the thermal conduction pathway, eliminating the need for separate cooling components.
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 enables high-power operation with minimal thermal damage, mechanical resilience, and consistent electromagnetic behavior by maintaining low operating temperatures, thus enhancing performance and reliability.
Implementation Method 1
a thermally conductive cavity, wherein the first patch is located within and mechanically connected to the cavity, the cavity being configured to dissipate thermal energy from the first patch
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A patch antenna includes a thermally conductive first patch, an RF feed and a thermally conductive cavity. The thermally conductive first patch is configured to transmit a radio frequency (RF) signal. The RF feed is configured to feed the RF signal to the first patch. The first patch is located within and mechanically connected to the thermally conductive cavity. The thermally conductive cavity is configured to dissipate thermal energy from the first patch.