TEM Array Antenna Modular Fabrication
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Solution Overview
Problem
The fabrication of high-performance antennas with wide bandwidth and dual polarization at millimeter wave frequencies is challenging due to difficulties in forming precise structures and maintaining electrical continuity, such as the 'egg crate' structure and precise alignment of components in existing designs like TEM flare antennas.
Innovation Solution
A modular system using standard printed wiring board techniques to form base blocks with a ground plane, metallization layers, and cage posts, allowing for the precise placement and connection of pyramids to create a TEM array antenna, enabling efficient signal radiation and dual polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If egg crate structure with conductive joints is used for dual polarization, then dual polarization capability is achieved, but manufacturing precision and assembly tolerance requirements increase significantly
Solution Approach 1:
The antenna array is divided into modular unit cells, each independently fabricated with dual-polarized elements. These standardized modules are then assembled into larger arrays, reducing overall manufacturing complexity and tolerance accumulation while maintaining dual polarization capability at each module level.
Solution Approach 2:
The unit cell design integrates both vertical and horizontal polarized elements within a single standardized structure that can support multiple polarization modes. This universal module design eliminates the need for separate structures for different polarizations, reducing assembly complexity and tolerance requirements.
2Duration of action of moving object
If flared dipole or notch structures are used for wideband operation, then wide bandwidth is achieved, but structural complexity and manufacturing difficulty increase
Solution Approach 1:
The unit cell employs localized geometric variations (flared notches or dipoles) only at specific regions where bandwidth enhancement is needed, while maintaining simpler structures in other areas. This selective application of complex geometry achieves wide bandwidth without uniformly increasing overall structural complexity.
Solution Approach 2:
The flared dipole or notch structures are integrated within the compact unit cell framework, with the bandwidth-enhancing elements nested within the overall module boundaries. This nesting approach achieves wideband performance while maintaining a compact, manufacturable form factor.
3Adaptability or versatility
If current sheet array with suspended dipoles is used, then dual polarization and wide bandwidth are achieved, but alignment precision requirements increase
Solution Approach 1:
The dipole elements, feed structures, and support mechanisms are merged into a single integrated unit cell module. This consolidation eliminates the need for separate alignment of multiple components during assembly, reducing alignment precision requirements while maintaining dual polarization capability.
Solution Approach 2:
All alignment-critical features are pre-positioned and fixed during unit cell fabrication before assembly. The feed structures and dipole elements are permanently attached in their correct relative positions during module manufacturing, eliminating the need for precise alignment during final array assembly.
4Duration of action of moving object
If TEM flare antenna with tapered pyramid structure is used, then ultra-wide bandwidth is achieved, but mechanical tolerance requirements for gap consistency increase
Solution Approach 1:
The tapered pyramid flare structure is divided into discrete, standardized segments that form the unit cell. These segmented structures are fabricated with controlled gaps using standard PCB tolerances, eliminating the need for tight mechanical tolerances on gap consistency while maintaining ultra-wide bandwidth through the cumulative flare effect.
Solution Approach 2:
The flare taper ratio and segment dimensions are optimized to achieve ultra-wide bandwidth while being compatible with standard manufacturing tolerances. By adjusting geometric parameters within acceptable ranges, the design achieves wideband performance without requiring tight mechanical tolerances on gap consistency.
Data Source
AI summary
A base block of a flare antenna may be made by: forming a ground plane on a base insulating layer; forming an intermediate insulating layer over the ground plane; patterning radiating and shorting traces on the intermediate insulating layer; forming a top insulating layer over the radiating and shorting traces; forming a top metallization layer; connecting the top metallization layer to the ground plane with vias passing through the intermediate insulating layer; and forming a via that contacts the radiating trace and passes through the ground plane and is not in electrical contact with the top metallization layer or the ground plane.