Dual-Polarized FILE Antenna Arrays With Common-Mode Resonance Suppression
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Solution Overview
Problem
Current ultra-wideband (UWB) antenna arrays face scalability challenges, particularly in high millimeter wave bands, due to manufacturing tolerances and intricate handling of dual-polarized tiles, limiting their performance and cost-effectiveness.
Innovation Solution
The use of fully inverted-L elements in dual-polarized UWB antennas and arrays, which tightly couple to a common shorted via to suppress common mode resonance, along with optimal unit cell spacing and a dual-layer superstrate, enables efficient operation from 34 GHz to 94 GHz with reduced element number and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-planar architectures with vertically assembled PCBs or 3D manufacturing techniques are used, then dual-polarized antenna performance is achieved, but scalability is limited by manual assembly procedures and manufacturing tolerances
Solution Approach 1:
The antenna array is divided into multiple planar PCB tiles that can be independently manufactured and then assembled. Each tile contains complete antenna elements with dual polarization capability, allowing parallel manufacturing and reducing manual assembly complexity while maintaining performance.
Solution Approach 2:
The design transitions from non-planar 3D structures to planar 2D PCB tiles stacked in layers. This dimensional change enables standard PCB manufacturing techniques to be used instead of complex 3D manufacturing, significantly improving scalability and reducing manual assembly requirements.
2Ease of manufacture
If planar architectures with stacked PCB tiles are used, then manufacturing scalability is improved, but manufacturing tolerances become challenging in the high mmWave regime
Solution Approach 1:
The antenna elements are designed to be self-adjusting through their geometric configuration. The fully inverted-L elements with specific dimensions and spacing automatically compensate for typical PCB manufacturing variations, reducing the impact of tolerances on high mmWave performance without requiring tighter manufacturing controls.
Solution Approach 2:
The antenna design uses specific parameter choices such as element lengths, widths, and spacing that are optimized to be less sensitive to manufacturing variations. By carefully selecting these parameters, the antenna maintains stable performance across the expected tolerance range of standard PCB manufacturing processes.
3Adaptability or versatility
If dual-polarized tiles with intricate intersection points are used, then dual-polarization capability is achieved, but handling and assembly complexity increases
Solution Approach 1:
Both orthogonal polarization elements are integrated onto a single planar PCB tile rather than using separate tiles. The fully inverted-L elements share common ground references and feeding structures, simplifying the assembly process while maintaining dual-polarization functionality. This merging eliminates the need to handle and align multiple separate polarized tiles.
4Ease of manufacture
If standard PCB manufacturing techniques are used, then cost-effectiveness is improved, but operating bandwidth and frequency ratio are limited
Solution Approach 1:
The antenna elements are designed with dynamic current distribution characteristics through their inverted-L geometry. This allows the same physical structure to efficiently operate across a wide frequency range by adapting the current paths, enabling standard PCB-manufactured antennas to achieve ultra-wideband performance from 34 GHz to 94 GHz with a 2.75:1 frequency ratio.
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 solution provides dual-polarized UWB arrays with a high cutoff frequency, wide scanning capabilities, and low VSWR, supporting next-generation communication systems while adhering to standard PCB tolerances, with simulated results demonstrating a 2.75:1 bandwidth ratio and orthogonal port coupling below -10 dB.
Implementation Method 1
The same shorted via can be utilized to suppress the well-known common mode resonance
Implementation Method 2
Fully inverted-L elements (FILEs) can be used as the radiating elements in a unit cell antenna
Data Source
AI summary
Dual-polarized ultrawideband antennas and antenna arrays are provided. Fully inverted-L elements (FILEs) can be used as the radiating element in a unit cell antenna, which can be repeated to form an array. The dual-polarized FILE unit cell can include two L-bent elements, which tightly couple to a common shorted via as well as to each other. The same shorted via can be utilized to suppress the well-known common mode resonance.