Base Station Power Divider Decoupling Window for Trace Coupling
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Solution Overview
Problem
Power dividers in base station antennas experience strong coupling between adjacent transmission line traces, leading to inconsistent signal energy ratios and degraded performance parameters such as return loss, which affects the power division ratio and phase difference of output signals.
Innovation Solution
A power divider design incorporating a dielectric substrate with a transmission line circuit and a reference potential layer featuring a decoupling window that reduces coupling between traces, allowing for improved signal splitting without altering the trace distribution on the substrate surface, thereby enhancing the power divider's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If adjacent transmission line traces are placed close together to reduce space occupation, then the area of the power divider is reduced, but the coupling between traces increases causing inconsistent signal energy ratios
Solution Approach 1:
A decoupling structure is introduced as an intermediary element between adjacent transmission line traces. This decoupling structure includes a first decoupling trace connected to the first transmission line trace and a second decoupling trace connected to the second transmission line trace, with a decoupling capacitor connecting these two decoupling traces. This intermediary structure reduces the direct coupling between adjacent traces while maintaining compact spacing, thereby resolving the contradiction between small area and consistent signal energy ratio.
2Area of moving object
If transmission line traces are placed close together to minimize device size, then the power divider becomes more compact, but return loss performance deteriorates due to increased coupling
Solution Approach 1:
The decoupling structure acts as an intermediary that isolates adjacent transmission line traces electrically. By connecting decoupling traces to the main transmission lines through decoupling capacitors, the structure reduces unwanted coupling effects while maintaining compact trace spacing, thus improving return loss performance without increasing device size.
Solution Approach 2:
The decoupling capacitor introduces a reactive parameter that changes the electrical characteristics of the transmission line circuit. By carefully selecting the capacitance value, the coupling between adjacent traces can be optimized to achieve better return loss performance while maintaining compact dimensions.
3Object-affected harmful factors
If the trace distribution is altered to reduce coupling, then coupling between traces decreases, but the original layout design and trace positions must be changed
Solution Approach 1:
Rather than changing the original trace layout, the decoupling structure is added as an intermediary element that connects to existing traces. This approach reduces coupling between adjacent traces while preserving the original trace distribution and positions, minimizing the need for layout redesign.
Solution Approach 2:
The coupling reduction is achieved by segmenting the interaction between adjacent traces through the introduction of decoupling traces and capacitors. This segmentation allows each original trace to maintain its position while the decoupling elements manage the electromagnetic coupling between them, avoiding the need to redistribute the main signal traces.
Data Source
AI summary
A power divider includes: a dielectric substrate; a transmission line circuit on a first surface of the dielectric substrate, the transmission line circuit including an input trace, a first output trace and a second output trace. The transmission line circuit is configured to split a signal received at the input trace into a first sub-component that is output on the first output trace and a second sub-component that is output on the second output trace; and a reference potential layer, set on a second surface opposite the first surface of the dielectric substrate, where the reference potential layer is provided with a decoupling window that exposes a part of the dielectric substrate to reduce coupling in the transmission line circuit.