Continuous Current Rod Antenna with Dielectric Mediator
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Solution Overview
Problem
Collinear antenna arrays face a tradeoff between being compact and wideband, with existing designs often compromising on either bandwidth or efficiency, particularly in UHF and VHF frequencies, where space constraints are a challenge, especially in aerodynamic applications like aircraft.
Innovation Solution
A Continuous Current Rod Antenna design featuring tightly packed collinear antenna elements coupled with a conductive backplane and a high dielectric sleeve, allowing for dense T/R module packaging and higher gain over larger bandwidths without the need for baluns, enabling efficient power sharing among multiple transmitter modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If collinear antenna array is placed in close proximity to support structures to reduce size, then compactness is improved, but bandwidth and efficiency deteriorate
Solution Approach 1:
A dielectric member is introduced as an intermediary component between the collinear antenna elements and the support structure. This dielectric member has a relative permittivity between 2.0 and 4.0, which transforms the support structure from a reflective surface into an absorptive surface, thereby reducing harmful reflections and improving antenna efficiency and bandwidth while maintaining compact proximity mounting
2Area of stationary object
If antenna elements are densely packed to reduce footprint, then compactness is improved, but radiation impedance stability deteriorates
Solution Approach 1:
The dielectric member serves as a mediator that stabilizes the electromagnetic environment between densely packed antenna elements and the support structure. By reducing reflections from the support structure, the dielectric member maintains consistent radiation impedance even when elements are closely spaced, enabling dense packing without compromising impedance stability
3Length of stationary object
If parallel fed elements are used with Yagi directors to achieve low profile installation, then profile height is improved, but bandwidth deteriorates
Solution Approach 1:
The dielectric member replaces the traditional Yagi director configuration by transforming the support structure into an absorptive surface. This eliminates the need for parasitic directors while achieving low profile installation, and simultaneously improves bandwidth by reducing reflections that would otherwise limit operational frequency range
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 design achieves lower profile packaging with significantly higher gain and wider bandwidths than previous collinear array techniques, allowing for efficient radiation over several octaves while minimizing backplane interference and supporting frequency scanning.
Implementation Method 1
a dielectric member having a relative permittivity between 2.0 and 4.0 positioned between the array of collinear antenna elements and the support structure
Implementation Method 2
transforming the support structure from a reflective surface into an absorptive surface, thereby reducing harmful reflections from the support structure
Data Source
AI summary
A Continuous Current Rod Antenna that may be positioned in close proximity to a conductive backplane and has extremely tight lattices which stabilize the radiation impedance and allows dense T/R modules packaging. The Continuous Current Rod Antenna offers lower profile packaging, with higher gain over larger bandwidths than other collinear array techniques.