{"id":6592,"date":"2026-03-19T17:28:55","date_gmt":"2026-03-19T16:28:55","guid":{"rendered":"https:\/\/wavebyagc.com\/?p=6592"},"modified":"2026-03-20T06:16:46","modified_gmt":"2026-03-20T05:16:46","slug":"what-is-an-electromagnetic-wave-em-wave","status":"publish","type":"post","link":"https:\/\/wavebyagc.com\/en\/blog\/what-is-an-electromagnetic-wave-em-wave\/","title":{"rendered":"What is an electromagnetic wave (EM wave)?"},"content":{"rendered":"\n<p>An <strong>electromagnetic wave<\/strong> is energy traveling through space as <strong>linked electric and magnetic fields<\/strong>. Unlike sound, which needs air (or another medium) to travel, electromagnetic waves can travel through a vacuum\u2014this is how sunlight reaches Earth.<\/p>\n\n\n\n<p>In everyday life, we often call EM waves \u201csignals\u201d or \u201cradio waves,\u201d but the electromagnetic spectrum is much broader. What changes from one EM wave to another is mainly its <strong>frequency<\/strong>\u2014how fast the wave oscillates\u2014measured in <strong>hertz (Hz)<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-1024x576.jpg\" alt=\"Electromagnetic wave frequency spectrum with examples (Wi-Fi, GPS, 4G\/5G, MRI) and shielding glass attenuation concept.\u201d\" class=\"wp-image-185\" srcset=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-1024x576.jpg 1024w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-300x169.jpg 300w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-768x432.jpg 768w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-1536x864.jpg 1536w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1-650x366.jpg 650w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2020\/01\/miysis_3d_AGC_WaveAttoch_champ_final02-1.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-blue-color\">Frequency: the \u201cchannel selector\u201d of EM waves<\/mark><\/h2>\n\n\n\n<p>Frequency is the first key concept because <strong>different frequency ranges behave differently<\/strong> and correspond to different technologies. A simple way to think about it: <strong>frequency is like a channel selector<\/strong>. It tells you which part of the EM world you are dealing with, and what devices are using it.<\/p>\n\n\n\n<p>Here are three practical ranges, with common examples you\u2019ll recognize:<\/p>\n\n\n\n<p>1. <strong>Lower frequencies (kHz to low MHz \u2014 and nearby)<\/strong><br>These frequencies can travel far and penetrate well, but they carry limited data compared to higher bands.<br>Examples include some broadcast and long-range communication systems.<br><\/p>\n\n\n\n<p>2. <strong>Radio frequencies (RF: hundreds of MHz to a few GHz)<\/strong><br>This is where most day-to-day connectivity lives\u2014especially inside buildings.<br>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wi-Fi \/ Wi-Fi 6<\/strong> (2.4 GHz and 5 GHz)<\/li>\n\n\n\n<li><strong>Bluetooth<\/strong><\/li>\n\n\n\n<li><strong>GPS<\/strong> (around 1.5 GHz)<\/li>\n\n\n\n<li><strong>Microwave Oven (<\/strong>2,4 GHz)<\/li>\n\n\n\n<li><strong>Professional radio systems<\/strong> (e.g., TETRA)<\/li>\n\n\n\n<li><strong>Mobile networks<\/strong> (2G\/3G\/4G and 5G \u201csub-6\u201d)<\/li>\n<\/ul>\n\n\n\n<p>3. <strong>Higher frequencies ( mmWave: above ~10 GHz)<\/strong><br>These frequencies can carry a lot of data, but they tend to be more \u201cline-of-sight\u201d and more sensitive to obstacles.<br>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>5G mmWave<\/strong> (commonly around 28\u201339 GHz in some regions)<\/li>\n\n\n\n<li><strong>Satellite communications<\/strong> in higher bands<\/li>\n\n\n\n<li>Certain <strong>radar<\/strong> and specialized links<\/li>\n<\/ul>\n\n\n\n<p>So when someone says \u201cwe need shielding,\u201d the first question is always: <strong>shielding against which frequencies?<\/strong><br><br><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"776\" src=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-1024x776.jpg\" alt=\"Electromagnetic wave frequency spectrum with examples (Wi-Fi, GPS, 4G\/5G, MRI) and shielding glass attenuation concept.\u201d\" class=\"wp-image-6594\" srcset=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-1024x776.jpg 1024w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-300x227.jpg 300w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-768x582.jpg 768w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-1536x1164.jpg 1536w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration-650x493.jpg 650w, https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-cfb41152-606d-44d5-9c69-011eb867be8a\" href=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration.png\">WAVETRAP radio waves illustration<\/a><a href=\"https:\/\/wavebyagc.com\/wp-content\/uploads\/2026\/03\/WAVETRAP-radio-waves-illustration.png\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-cfb41152-606d-44d5-9c69-011eb867be8a\">Download<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-blue-color\"><strong>Why attenuate electromagnetic waves?<\/strong><\/mark> <\/h2>\n\n\n\n<p>EM waves are not \u201cgood\u201d or \u201cbad\u201d by default\u2014they are tools. But in some environments, it becomes useful (or critical) to <strong>reduce<\/strong> them, for example:<\/p>\n\n\n\n<p>1. <strong>To avoid interference<\/strong><br>In hospitals, laboratories, data centers, or technical rooms, unwanted signals can disturb sensitive equipment, create measurement noise, or reduce system stability.<\/p>\n\n\n\n<p>2. <strong>To improve security<\/strong><br>In high-security settings, controlling EM waves can reduce unwanted connectivity and lower the risk of information leakage (proximity attack, EM Pulse,&nbsp; Eavesdropping). If signals freely pass through windows, the building envelope can become a weak point.<\/p>\n\n\n\n<p>3. <strong>To manage exposure and comfort concerns<\/strong><br>Some projects aim to limit electromagnetic exposure for comfort or precautionary reasons\u2014especially in dense urban areas where multiple signals overlap.<\/p>\n\n\n\n<p>This reduction is called <strong>attenuation<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-blue-color\"><strong>Attenuation in dB: the \u201cvolume knob\u201d for EM waves<\/strong><\/mark><\/h2>\n\n\n\n<p>Attenuation is typically expressed in <strong>decibels (dB)<\/strong>\u2014just like sound insulation. The idea is similar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A higher dB value means <strong>more reduction<\/strong> of the wave passing through a material or system.<\/li>\n<\/ul>\n\n\n\n<p>You don\u2019t need to be an engineer to use dB correctly. Just remember:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>dB is a logarithmic scale<\/strong>, so a small increase can represent a significant performance step.<\/li>\n\n\n\n<li><strong>20\u201330 dB<\/strong> can already be meaningful in many everyday RF situations.<\/li>\n\n\n\n<li><strong>50-60 dB <\/strong>can mean no more Mobile, Bluetooth or Wifi signal in your environment<\/li>\n\n\n\n<li><strong>80\u2013100 dB<\/strong> corresponds to very high shielding levels used for demanding environments.<\/li>\n<\/ul>\n\n\n\n<p>So attenuation answers the second essential question: <strong>how much reduction do we need?<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-blue-color\"><strong>Frequencies + dB: the two criteria that define the right solution<\/strong><\/mark><\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-left\">When specifying an EM control solution, the decision is driven by two parameters:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Which frequency range(s) are we targeting?<\/strong><\/li>\n\n\n\n<li><strong>What attenuation level (dB) is required?<\/strong><\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>This is especially important for glazing, because glass is often the most challenging part of a protected space: it must remain transparent and architectural while controlling waves.<\/p>\n\n\n\n<p>Here is a practical comparison:<\/p>\n\n\n\n<p>In glazing, the right EM solution is defined by two parameters: <strong>the frequency range<\/strong> to address and the <strong>attenuation level (in dB)<\/strong> required.<\/p>\n\n\n\n<p><br>For example, a standard architectural insulating glass unit\u2014even with advanced coatings such as high-performance multi-silver low-E\u2014may provide around <strong>~30 dB attenuation<\/strong> for certain radio signals in typical conditions. That\u2019s <strong>quite helpful<\/strong> when you want to reduce RF penetration\u2026 but it can be <strong>a little frustrating<\/strong> when you\u2019re simply trying to keep a phone conversation flowing without repeating: <em>\u201cCan you hear me?\u201d<\/em><\/p>\n\n\n\n<p><br>An <strong>MRI (IRM) observation window<\/strong> is a completely different world. MRI systems operate using <strong>RF energy<\/strong> (often in <strong>lower RF ranges<\/strong>, typically in the <strong>MHz<\/strong> region depending on magnet strength) and must detect <strong>extremely weak return signals<\/strong> to form images. MRI rooms are therefore shielded to <strong>block outside RF that would degrade image quality<\/strong> and to <strong>contain the MRI\u2019s own RF emissions<\/strong>. As a result, required shielding levels are much higher\u2014often around <strong>~100 dB<\/strong> at the relevant frequencies, depending on the specification.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-pullquote has-lightgray-color has-blue-background-color has-text-color has-background has-link-color wp-elements-3d96a903543421b6aef5827e26642b09\" style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\"><blockquote><p><strong>Attenuation of 60 dB<br>=<br>signal divided by 1 000 000<\/strong><\/p><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-blue-color\">WAVETRAP: mastering electromagnetic performance while speaking \u201cglass\u201d<\/mark><\/strong><\/h2>\n\n\n\n<p>This is exactly where <strong>WAVETRAP<\/strong> comes in: bringing electromagnetic logic into architectural glazing in a way that matches real project needs.<\/p>\n\n\n\n<p>Instead of a generic \u201cshielding\u201d claim, the approach starts with the two questions that matter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Which frequencies are relevant<\/strong> for the building and the use case (security, medical, technical, institutional, etc.)?<\/li>\n\n\n\n<li><strong>What attenuation level (dB)<\/strong> is needed to manage interference, reduce risk, or improve control\u2014without losing daylight and transparency?<\/li>\n<\/ul>\n\n\n\n<p>Because in the end, the right solution is not one-size-fits-all. It is the right <strong>frequency coverage<\/strong> and the right <strong>dB performance<\/strong>, delivered in a glazing system designed for the built environment.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Is an Electromagnetic Wave? A Simple Guide to Frequency, dB Attenuation, and Shielding Glass <\/p>\n","protected":false},"author":9,"featured_media":1085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[72,68],"tags":[115,116,117,118,119,120,121,122,123,113,114],"class_list":["post-6592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-wavetrap","tag-frequency-ranges","tag-primary-keywords-electromagnetic-wave-definition","tag-attenuation-in-db","tag-emi-shielding","tag-em-wave","tag-electromagnetic-shielding-glazing","tag-rf-frequency","tag-rf-shielding-glass","tag-mri-rf-window","tag-electromagnetic-waves","tag-attenuation-db"],"acf":[],"yoast_head":"<title>WAVETRAP EM Shielding Glass in TACITA ROOM | WAVE by AGC<\/title>\n<meta name=\"description\" content=\"Discover TACITA ROOM featuring WAVETRAP electromagnetic shielding glass: transparent 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