Bridging Coupled Divider for Signal Isolation
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Solution Overview
Problem
Existing divider/combiner circuits face challenges in achieving optimal signal distribution and isolation across multiple nodes, particularly in high-frequency applications, where inductive coupling between transmission lines can lead to inefficiencies and limited bandwidth.
Innovation Solution
The design incorporates a first and second divider section with associated transmission lines and a bridging assembly, where specific conductors are closely inductively coupled or uncoupled to manage signal flow and impedance, ensuring equal output signals and optimal impedance matching with externally connected loads, and includes grounded terminations for thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transmission lines are spaced closely together to achieve compact design, then device area is reduced, but inductive coupling between lines increases causing signal interference and reduced isolation
Solution Approach 1:
The patent introduces a ground plane as an intermediary between closely spaced transmission lines. This ground plane acts as a shield that prevents inductive coupling between adjacent lines while maintaining compact spacing. The ground plane is positioned between the lines and connected to ground, creating an electromagnetic barrier that isolates signals without requiring large separation distances.
Solution Approach 2:
The patent moves the isolation mechanism from the horizontal plane (lateral spacing between lines) to the vertical dimension by introducing a ground plane between layers. This allows transmission lines to be closely spaced in the horizontal plane while maintaining isolation through vertical separation via the ground plane, effectively utilizing the third dimension to resolve the contradiction.
2Reliability
If multiple cascaded sections are added to improve VSWR, isolation, and bandwidth, then performance is improved, but device complexity and size increase
Solution Approach 1:
The patent achieves improved VSWR and isolation performance by optimizing the parameters of a single divider section rather than cascading multiple sections. Key parameters including line impedance values, ground plane dimensions, and spacing are carefully tuned to achieve the desired performance metrics, eliminating the need for complex multi-section designs.
Solution Approach 2:
The patent extracts and eliminates unnecessary cascaded sections from the divider design. By focusing on optimizing a single well-designed section with proper ground plane integration, the patent removes the complexity of multiple cascaded sections while maintaining or improving performance through parameter optimization.
3Ease of manufacture
If transmission lines are spaced far apart to reduce inductive coupling, then signal isolation is improved, but device area increases
Solution Approach 1:
The ground plane serves as an intermediary that enables strong signal isolation without requiring large spacing between transmission lines. The ground plane is positioned between the lines and provides electromagnetic shielding, allowing the lines to be closely spaced while maintaining isolation comparable to or better than designs with larger spacing.
Solution Approach 2:
The patent resolves the spacing-isolation tradeoff by moving the isolation function to the vertical dimension through the ground plane. This allows horizontal spacing to be minimized for compact design while vertical separation via the ground plane maintains excellent signal isolation.
4Area of stationary object
If inductively coupled sections are used to reduce device size, then area is reduced, but bandwidth is limited and insertion loss increases
Solution Approach 1:
The ground plane acts as an intermediary that enables compact spacing without the harmful inductive coupling that limits bandwidth. By providing electromagnetic shielding, the ground plane allows the transmission lines to be closely spaced for compact design while preventing the inductive coupling that would otherwise cause bandwidth limitations and increased insertion loss.
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 configuration achieves a three-to-one bandwidth at high frequencies (1.0-3.0 GHz or 2.0-6.0 GHz) with improved signal isolation and thermal conductivity, reducing insertion loss and reflection coefficients, while maintaining high output power and efficiency.
Implementation Method 1
The third and fifth conductors may be closely inductively mutually coupled
Implementation Method 2
the fourth and sixth conductors may be closely inductively mutually coupled
Implementation Method 3
grounded terminators for thermal management
Data Source
AI summary
A divider may include a first node, a second node, a third node, at least a first divider section, and a first bridging assembly. The first divider section may include associated first and second transmission lines that respectively include first and second conductors that couple the first node to the second and third nodes. The first bridging assembly may include first and second resistors, and third, fourth, fifth, and sixth conductors. First ends of the third and fourth conductors may be respectively connected to the first and second conductors. Second ends of the third and fourth conductors may be grounded. The fifth and sixth conductors may be connected together and their opposite ends may be respectively terminated to ground by the first and second resistors. The third and fifth conductors may be closely inductively mutually coupled, and the fourth and sixth conductors may be closely inductively mutually coupled.