High-Density RF PCB Connections for Full-Duplex ESA Isolation
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Solution Overview
Problem
Conventional radio frequency (RF) antenna arrays for space-deployed satellites face challenges such as increased size, weight, and complexity due to separate Tx and Rx arrays, coaxial interconnects leading to phase and amplitude tracking errors, and cumbersome assembly processes.
Innovation Solution
Implementing a full duplex ESA design with a single shared Tx/Rx assembly using high-speed, high-density digital connectors and stripline links to replace coaxial cables, enabling simultaneous Tx and Rx operations with reduced size, mass, and improved signal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate Tx and Rx antenna arrays are employed, then full duplex functionality is achieved, but size, weight, and complexity increase significantly
Solution Approach 1:
The patent combines transmit and receive antenna arrays into a single shared aperture structure, eliminating the need for physically separate Tx and Rx arrays. This merging reduces system mass, volume, and complexity while maintaining full duplex capability through polarization separation and RF shielding.
Solution Approach 2:
The shared antenna array structure serves dual purposes as both transmit and receive aperture, with each element capable of both functions. This multi-functionality is achieved through polarization orthogonality and time-division or frequency-division multiplexing, reducing the overall system footprint.
2Reliability
If coaxial interconnects are used to connect RF components, then signal transmission is achieved, but phase and amplitude tracking errors increase
Solution Approach 1:
The patent replaces mechanical coaxial cable interconnects with printed circuit board (PCB) trace interconnects. This substitution eliminates the phase and amplitude tracking errors associated with coaxial cables by providing a rigid, precision-manufactured transmission path that is immune to temperature-induced variations and connection inconsistencies.
Solution Approach 2:
The invention changes the transmission medium from flexible coaxial cable to rigid PCB traces, fundamentally altering the electrical characteristics. PCB traces provide stable impedance control and consistent electrical length, eliminating the parameter variations that cause tracking errors in coaxial systems.
3Ease of operation
If numerous coaxial connectors and cables are used, then RF signal distribution is achieved, but assembly time and manufacturing complexity increase
Solution Approach 1:
The patent replaces numerous individual coaxial connectors and cables with integrated PCB trace routing. This substitution reduces assembly time by eliminating manual cable installation, connector mating, and routing operations, while providing inherent signal distribution through the PCB's circuit layout.
Solution Approach 2:
The invention merges multiple discrete coaxial connection functions into a single integrated PCB assembly. The PCB simultaneously provides mechanical support, electrical connection, signal routing, and shielding, consolidating what would otherwise require dozens of separate components and assembly steps.
4Adaptability or versatility
If coaxial cables are bent or angled to route signals, then flexible routing is achieved, but phase tracking errors increase
Solution Approach 1:
The patent replaces flexible coaxial cable routing with rigid PCB trace routing. The PCB's layered structure and via connections provide the necessary routing flexibility without requiring cable bends or angles, maintaining consistent electrical characteristics throughout the signal path.
Solution Approach 2:
The invention moves the routing problem from three-dimensional cable manipulation to two-dimensional PCB plane routing. This dimensional change allows signals to be routed around obstacles and to different locations using trace geometry and layer transitions, eliminating the need for cable bends while maintaining electrical performance.
Data Source
AI summary
Provided herein are various enhancements for coupling radio frequency signals among components of aperture antenna arrays and electronically steered arrays (ESAs). An apparatus is provided having a first printed circuit board comprising stripline links arranged to carry radio frequency signals routed to a connector configured to couple to a mating connector on a second printed circuit board. Connections of the connector are arranged to carry the radio frequency signals to the second printed circuit board using at least a connection arrangement having a perimeter of radio frequency ground connections surrounding a set of radio frequency connections configured to carry the radio frequency signals, with each of the radio frequency connections of the set spaced apart within the perimeter by additional instances of the radio frequency ground connections such that a target signal isolation among individual ones of the radio frequency signals is established.