Ruggedized Parallel-Plate Spindle With RF Choke Isolation
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Solution Overview
Problem
Parallel-plate transmission-line structures are susceptible to mechanical shock and vibration, which alters RF properties such as resonant frequency and propagation speed, and existing solutions like dielectric support or conductive posts introduce undesired RF reflections or weight increases.
Innovation Solution
A support member with RF choke structures, such as coaxial or radial chokes, is used to electrically isolate mechanical connections between parallel plates, minimizing RF interactions and allowing for rotational stability while maintaining mechanical rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If discrete conductive or dielectric posts are employed to mechanically interconnect opposing parallel-plate surfaces, then mechanical support is provided, but internal RF short-circuit boundary conditions are created which cause undesired RF reflections and modify internal fields
Solution Approach 1:
A dielectric coating layer is introduced as an intermediary between the conductive support post and the parallel-plate surfaces. This dielectric layer electrically isolates the conductive post from the RF fields while maintaining mechanical support, thereby preventing RF short-circuit boundary conditions and reducing RF reflections.
Solution Approach 2:
The support structure employs a composite configuration combining conductive material (for mechanical strength) and dielectric material (for RF isolation). This composite approach allows the support post to provide mechanical support while the dielectric coating prevents harmful RF interactions.
2Strength
If fixed solid or porous low-loss dielectric is employed between the plates to provide internal mechanical support, then mechanical support is provided, but internal RF fields are perturbed and microwave characteristics are modified resulting in decreased wavelength and increased weight
Solution Approach 1:
Instead of filling the entire space between parallel plates with dielectric material for mechanical support, the patent extracts the support function to discrete localized support posts. This reduces the overall volume of dielectric material required, thereby reducing weight while still providing necessary mechanical support.
Solution Approach 2:
Mechanical support is provided locally at specific points through discrete support posts rather than uniformly throughout the entire structure. This localized approach minimizes the amount of dielectric material needed while maintaining structural integrity.
3Strength
If discrete conductive or dielectric posts are employed to mechanically interconnect opposing parallel-plate surfaces, then mechanical support is provided, but the structure creates undesired RF reflections
Solution Approach 1:
A dielectric coating layer is introduced as an intermediary between the conductive support post and the parallel-plate surfaces. This dielectric layer electrically isolates the conductive post from the RF fields while maintaining mechanical support, thereby preventing RF short-circuit boundary conditions and reducing RF reflections.
4Stability of the object's composition
If the individual parallel-plate surfaces are thickened and reinforced to minimize flexure, then mechanical stability is improved, but weight and thickness increase and RF functionality may be compromised
Solution Approach 1:
The mechanical support function is segmented from the parallel-plate surfaces themselves and transferred to discrete support posts. This allows the plates to remain thin and lightweight while the separate support posts provide the necessary mechanical stability, preventing flexure without adding weight to the plates.
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 effectively isolates RF interactions with the support member, maintaining desired RF properties and mechanical stability, reducing reflections and weight, and enabling rotation of plates for enhanced antenna performance.
Implementation Method 1
the at least one feature comprises a choke structure formed by a portion of the support member, the choke structure configured to inhibit longitudinal RF currents along a surface of the support member bridging the first and second conducting plates
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3C
AI summary
A radio frequency (RF) transmission-line structure includes a parallel-plate transmission line formed from a first conducting plate and a second conducting plate. The second conducting plate is spaced apart from the first conducting plate and substantially parallel to the first conducting plate. A support member is attached to the first and second plates and is operative to maintain a fixed mechanical spacing between the first conducting plate and the second conducting plate. The transmission-line structure further includes at least one feature configured to isolate or suppress RF interaction of the support member with RF fields within the parallel-plate transmission line.