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How to Choose the Right Coupling Value for Your DAS System
May , 09 2026
When people talk about DAS systems, most of the attention usually goes to antennas, splitters, or base station equipment. But in many real projects, one small component has a surprisingly big impact on coverage quality — the directional coupler. A poorly selected coupling value can create all kinds of problems: Strong signal in one area, weak signal in another Dead zones at the far end of the buil...
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Why Is My RF Signal Weak After Adding a Filter?
May , 16 2026
At first glance, adding an RF filter sounds like a simple upgrade. The goal is usually clear: Reduce interference Clean up the signal Improve network stability Protect sensitive RF equipment But in real projects, many engineers and installers run into the same frustrating problem: “The interference is gone, but now the signal is much weaker.” This happens more often than people expect, especially ...
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Low PIM Components: The Real Engineering Math From link budget to selection traps
Jun , 16 2026
Anyone who has worked on distributed antenna systems will eventually have a head‑on fight with PIM. This post skips the fluff and only shows the engineering math. 1. Where PIM comes from — the formula Two frequencies f1, f2 pass through a non‑linear node (loose connector, oxidized plating, magnetic material) and generate intermodulation products: 3rd order: 2f1－f2 , 2f2－f1 5th order: 3f1－2f2 , 3f2...
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