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Understanding Low PIM in RF Passive Components: Why It Matters
Jul , 17 2025
What is PIM and Why "Low" PIM is Critical? PIM stands for Passive Intermodulation, a form of signal distortion that occurs when two or more high-power RF signals mix within a passive component—such as connectors, cables, power splitters, couplers, or antennas—and create unwanted interference at new frequencies. These new frequencies can degrade system performance, reduce data throughput, and affec...
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How to Avoid PIM Interference in DAS Systems
Aug , 07 2025
In Distributed Antenna Systems (DAS), Passive Intermodulation (PIM) is one of the most common yet overlooked causes of performance degradation. While DAS networks are designed to enhance wireless coverage and capacity, PIM can severely compromise signal quality, leading to dropped calls, reduced data throughput, and costly troubleshooting. This article outlines the practical measures and engineeri...
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Design Tips for DAS Power Splitters, Couplers, and Combiners
Aug , 21 2025
In modern communication networks, DAS (Distributed Antenna System) plays a critical role in ensuring high-quality indoor and outdoor signal coverage. The performance of a DAS network not only depends on antenna placement but also heavily relies on core RF components such as power splitters, directional couplers, and combiners. Proper design, selection, and installation of these components directly...
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Mastering Power Splitter Design: From Principle to Engineering Practice
Oct , 11 2025
In RF and microwave systems, the power splitter is a core passive component responsible for dividing an input signal into multiple outputs with minimal loss and perfect impedance balance. From cellular base stations to satellite networks and RF test systems, the power splitter ensures signal integrity across transmission paths. 1. Basic Principle of Power Splitters A power splitter divides an inpu...
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What Does a Directional Coupler Do, and Why Is It Essential in DAS Projects?
Nov , 22 2025
When working on a Distributed Antenna System (DAS), many engineers encounter a familiar headache: the hardware looks fine — antennas, splitters, cables all seem correctly selected — yet the actual coverage still fluctuates. Some areas have excellent signal, while others stubbornly remain weak. Experienced engineers usually check one component first: the Directional Coupler. Although it’s not as in...
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What's the Difference Between a Combiner and a Hybrid?
Dec , 06 2025
In RF system design and engineering projects, "Combiner" and "Hybrid Coupler (or Hybrid Combiner)" are often mentioned, but they are not the same. Their applications and performance characteristics differ significantly. Basic Concepts and Technical Differences Hybrid Coupler (Hybrid Combiner) is typically a four-port device based on coupled lines, transmission line theory, or branch-line / ring st...
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