Martin Belgica CODE

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When discussing the “depth” of penetration for 5G compared to 4G frequencies, we are primarily looking at how deeply the radiofrequency (RF) signals penetrate biological tissue, such as the human body. Penetration Depth in Biological TissueThe depth to which electromagnetic radiation penetrates any material, including the human body, is inversely proportional to its frequency. Higher frequencies have shorter wavelengths and tend to be absorbed more readily at the surface, resulting in a shallower penetration depth.4G (Long-Term Evolution): Standard 4G networks typically operate in lower frequency bands, generally ranging from around 600 MHz to 2.6 GHz. These frequencies have relatively long wavelengths, which allows them to penetrate more deeply into buildings and, consequently, further into biological tissue compared to higher 5G frequencies.5G (Fifth Generation): 5G networks operate across three main frequency bands:Low-band (below 1 GHz): These frequencies are similar to 4G and offer deeper penetration into buildings and tissue.

Mid-band (1 GHz – 6 GHz): This range is often considered the “sweet spot” for 5G, providing a balance of coverage and speed. Its penetration depth is shallower than low-band but deeper than high-band.

High-band (millimeter wave, or mmWave, above 24 GHz): This is the highest frequency band used by 5G and offers the fastest speeds but has the shortest range. Due to their extremely short wavelengths, mmWave signals are absorbed much more readily by skin, clothing, and other materials, resulting in a significantly shallower penetration depth compared to both lower 5G bands and standard 4G frequencies.Skin Depth ComparisonScientists use a metric called “skin depth” to quantify how quickly an electromagnetic wave decays as it enters a material. The skin depth is the distance at which the signal strength drops to approximately 37% of its value at the surface.At 4G frequencies (e.g., 900 MHz): The skin depth in human tissue is approximately 2 to 3 centimeters. This means the radiation can penetrate to varying depths within muscles, fat, and other underlying tissues.At low 5G frequencies (e.g., 3.5 GHz): The skin depth decreases slightly, to roughly 1 centimeter.At mmWave 5G frequencies (e.g., 28 GHz): The skin depth is significantly shallower, typically less than 1 millimeter. In this range, the majority of the RF energy is absorbed in the outer layers of the skin, including the epidermis and dermis, with very little energy reaching underlying organs or tissues.

conclusion, higher 5G frequencies, particularly mmWave, have a substantially shallower penetration depth than 4G frequencies. The main reason for this difference is that higher frequency waves are more readily absorbed by water and other molecules within the body, which effectively shields deeper tissues from the radiation.