-
DAS vs IBS: What's the Difference? | In-Building Coverage Explained
Jun , 09 2026
1. The real problem: indoor signal is broken Over 80% of mobile traffic happens indoors — yet most buildings kill signal in seconds. Concrete walls, steel frames, low-E glass, underground parking: all block RF. From 2G to 4G, outdoor macro towers could still punch through building walls. That changed with 5G. Higher spectrum (3.5GHz to mmWave) barely penetrates. Even with boosted power, 5G signals...
View more
-
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...
View more
-
4G Internal Antenna vs External Antenna: How to Choose the Right LTE Antenna
Jul , 21 2026
During the design of 4G LTE communication equipment, antenna selection is often one of the most critical decisions affecting wireless performance. For equipment manufacturers, system integrators, and wireless solution providers, a common question keeps coming up: Should I choose a 4G internal antenna or a 4G external antenna? Many engineers fall into a simple trap early in a project: “External ant...
View more
