Combiner Divider Circuit With Ferrite Sleeve For Microwave Parasitic Reduction
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Solution Overview
Problem
High power broadband communication systems require well-balanced circuits to minimize signal coupling and noise, but achieving balanced signals is challenging, especially at microwave frequencies where parasitic elements can easily unbalance the signals.
Innovation Solution
A combiner/divider circuit design using coaxial transmission lines with balanced terminals and a ferrite sleeve to reduce parasitic capacitance and enhance high-frequency performance, allowing for higher power applications with reduced losses and increased bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coaxial transmission lines are used for broadband communication at microwave frequencies, then bandwidth and power handling capability are improved, but parasitic capacitance and signal unbalance increase
Solution Approach 1:
A ferrite sleeve is introduced as an intermediary component surrounding the coaxial transmission lines in the connection region. The ferrite material provides magnetic shielding and reduces parasitic capacitance effects between adjacent conductors, allowing broadband operation at microwave frequencies while minimizing signal unbalance and interference.
Solution Approach 2:
The patent employs composite construction by combining ferrite magnetic material with the metallic coaxial transmission line structure. This composite approach leverages the high permeability of ferrite to control electromagnetic fields and reduce parasitic effects, enabling the system to achieve both wide bandwidth and low parasitic capacitance.
2Reliability
If balanced circuits are used to minimize signal coupling and noise, then signal integrity is improved, but circuit complexity and fabrication difficulty increase
Solution Approach 1:
The circuit is divided into distinct balanced and unbalanced sections using separate coaxial transmission lines for each signal path. Each transmission line maintains its own signal and return conductors, allowing independent control and termination of balanced signals while simplifying the overall circuit layout and fabrication.
Solution Approach 2:
The patent implements balanced signal paths where both signal conductors are maintained at equal impedance levels and symmetrical geometric configurations. This equipotential approach ensures that both sides of the balanced circuit experience identical electromagnetic environments, minimizing differential mode noise and maintaining signal integrity without requiring complex active balancing circuits.
3Ease of operation
If ground plane return path is used to simplify circuit wiring, then wiring simplicity is improved, but signal coupling and noise increase
Solution Approach 1:
The patent extracts the return current path from the common ground plane and assigns it to dedicated signal-return conductors in each coaxial transmission line. This separation removes the return currents from the ground plane, eliminating the coupling and noise problems associated with ground plane returns while maintaining wiring simplicity through the self-contained coaxial structure.
Solution Approach 2:
The coaxial transmission line structure acts as an intermediary between the signal source and load, providing a controlled impedance path with the return conductor closely coupled to the signal conductor. This intermediary structure confines electromagnetic fields within the coaxial geometry, preventing interference with surrounding circuits while simplifying connections at the terminals.
Data Source
AI summary
A combiner/divider circuit may include first, second, third, fourth and fifth transmission lines each including a signal conductor and a signal-return conductor. The signal conductors at a first end of the first transmission line may form a first unbalanced sum signal terminal and the signal conductors at first ends of the second, third, fourth, and fifth transmission lines may form pairs of balanced signal terminals. The signal conductor at a second end of the first transmission line may be connected to the signal conductors at second ends of the fourth and fifth transmission lines. The signal conductors at second ends of the second and third transmission lines may be connected to the signal-return conductors at second ends of the fourth and fifth transmission lines, respectively. The second ends of the transmission lines may extend into the connection region along a common line.