Combiner Divider Circuit With Inductive Coupling
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Solution Overview
Problem
High power broadband communication systems face impedance mismatch issues between antennas and transmitters/receivers, leading to undesired coupling and noise in unbalanced circuits, which traditional baluns do not adequately address, especially in high bandwidth applications.
Innovation Solution
A combiner/divider circuit design utilizing multiple transmission lines with inductively coupled signal-return conductors to form balanced and unbalanced ports, incorporating ferrite sleeves to minimize spurious signals and ferrite loss, allowing for efficient signal distribution and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional baluns are used to transform impedance between antennas and transmitters/receivers, then impedance matching is achieved, but undesired coupling and noise occur in unbalanced circuits
Solution Approach 1:
The circuit is divided into multiple transmission lines (first, second, third, fourth, and fifth transmission lines) with distinct signal paths. Each transmission line carries specific signals (sum, difference, or component signals) separately, preventing unwanted coupling between signals while maintaining impedance matching through the structured segmentation of signal paths
Solution Approach 2:
Ferrite sleeves are introduced as intermediary components wrapped around the transmission lines. These ferrite sleeves act as mediators that reduce extraneous noise and spurious signals generated by the transmission lines themselves, without interfering with the primary signal transmission or impedance matching function
2Object-affected harmful factors
If balanced circuits with two conductors are used to reduce coupling, then coupling to other circuits is minimized, but perfectly balanced currents are difficult to achieve in practice
Solution Approach 1:
The transmission lines are designed to handle multiple signal types (balanced and unbalanced signals) within a single unified structure. The circuit can process sum signals, difference signals, and component signals through the same transmission line infrastructure, maintaining balanced current flow while accommodating various signal configurations without requiring separate dedicated paths for each signal type
Solution Approach 2:
The circuit creates balanced signal paths by establishing symmetrical transmission line configurations where fourth and fifth transmission lines are positioned and coupled in a mirrored fashion. This copying of the transmission line structure ensures that balanced currents are achieved through geometric symmetry and inductive coupling, making the balanced state more attainable in practice
3Object-affected harmful factors
If ferrite sleeves are added to minimize spurious signals and ferrite loss, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
Multiple transmission lines (fourth and fifth transmission lines) are positioned in close proximity and inductively coupled together, effectively merging their electromagnetic fields. This merging allows the lines to function as a coupled pair that reduces spurious signals through field cancellation effects, while the ferrite sleeves further enhance this by confining and controlling the magnetic fields, thereby reducing ferrite loss without proportionally increasing complexity
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 circuit effectively reduces noise and coupling by ensuring balanced signal currents, minimizing ferrite loss, and enabling the use of high power broadband antennas with reduced oscillations and extraneous noise, thus enhancing the performance of high gain operational amplifiers.
Implementation Method 1
At least a portion of the signal-return conductor of the fourth transmission line may be inductively coupled to at least a portion of the signal-return conductor of the fifth transmission line
Implementation Method 2
incorporating ferrite sleeves to minimize spurious signals and ferrite loss
Data Source
AI summary
A combiner/divider circuit may include a plurality of transmission lines forming a junction, a sum port, a first component port, a second component port, and a difference port. A transmission line may be associated with the difference port and may be formed by inductively coupling a portion of each of two other transmission lines. The difference port may be terminated by a terminating impedance element at a location spaced apart from the junction, with the inductively coupled portions being between the junction and the terminating impedance element.