In the process of mobile network construction, RF loss is one of the most common and overlooked factors affecting signal quality. From base stations to antennas, every connection, cable, and passive device introduces varying degrees of attenuation. For operators aiming to improve coverage efficiency and maintain network stability, understanding and minimizing these losses is crucial. 1. Types of R...

In 5G and large-scale DAS deployments, engineers often focus on radios, baseband units, and antenna patterns. These are visible, measurable, and easy to discuss in meetings. However, in real-world projects, performance limitations are far more often caused by something less obvious: passive RF loss. After working with operators, system integrators, and public safety networks for many years, one th...

In RF system design and deployment, one common question often arises: Can a power divider be used in reverse as a power combiner? From a theoretical standpoint, the answer is yes. However, in real-world engineering applications, this practice comes with several hidden risks. If not handled properly, it can degrade system performance or even damage critical components. In this article, we’ll break ...

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 ...

Combiner and duplexer are not the same thing. A combiner is a device that merges two or more RF signals into a single output path, with all signals flowing in the same direction — primarily used for power combining on the transmit side. A duplexer is a three‑port device that isolates transmit and receive signals, allowing them to share a single antenna, with the two signal paths flowing in opposit...

These three concepts do not sit on the same logical plane. Cable is a material‑level generic term — any coaxial cable that carries RF signals, whether semi‑rigid, semi‑flexible, or braided, is called a cable. Feeder and jumper are functional‑level classifications — both are specific application forms of cable, distinguished by the role they play in the system. In one sentence: a feeder is the high...

In DAS indoor distribution systems and RF link designs, the 10dB directional coupler is one of the most frequently used passive components. The two specifications engineers care about most are insertion loss and passive intermodulation (PIM) — the former directly eats into the link budget, the latter determines whether the uplink noise floor can be kept down. There are three main manufacturing tec...

Why Is the Link Budget Always Off? The most frustrating part of DAS design isn't drawing the system diagram. It's calculating the antenna port power, thinking it's sufficient, and then measuring it on site to find it's off by 5 or 6 dB. Coverage shrinks, users complain, and when you trace it back you find — component insertion loss was undercalculated, feeder loss was estimated wrong, connector lo...