# Lesson 27 — RAM, Polarization, and EMCON

<p class="block-synopsis">Shaping bought the orders of magnitude; this lesson buys the stubborn last decibels. Radar-absorbing material attacks the reflectivity knob, polarization betrays the edges and wires that shaping left behind, and emission control answers the one asymmetry no coating can absorb — the wave you chose to transmit.</p>

<div class="block-toc">
  <a class="bt-card bt-reading" href="L27_RAMPolarizationEMCON_Reading.html">
    <span class="bt-kind">Reading</span>
    <h4>RAM, Polarization, and EMCON</h4>
    <p>Quarter-wave cancellation and the narrowband promise, why polarization tells on edges and wires, and the intercept asymmetry that makes emitting dangerous.</p>
  </a>
  <a class="bt-card bt-flashcards" href="L27_Flashcards.html">
    <span class="bt-kind">Flashcards</span>
    <h4>Review deck</h4>
    <p>Key terms and relations from the lesson, in a self-test deck.</p>
  </a>
  <a class="bt-card bt-preflight" href="L27_Preflight.html">
    <span class="bt-kind">Pre-flight</span>
    <h4>Pre-flight quiz</h4>
    <p>Five questions to work before class — anyone can be called to the board.</p>
  </a>
  <a class="bt-card bt-slides" href="../_static/slides/ECE%20495%20-%20EW%20and%20Survivability%20-%20B3L27%20-%20Fall%202026.pdf" target="_blank" rel="noopener">
    <span class="bt-kind">Slides</span>
    <h4>Lesson slides</h4>
    <p>The deck we work through in class, as a PDF you can annotate.</p>
  </a>
  <a class="bt-card bt-demo" href="L27_QuarterWaveRAM_Demo.html">
    <span class="bt-kind">Demo</span>
    <h4>Quarter-Wave RAM</h4>
    <p>Size a Salisbury screen and watch its −10 dB notch snap to one band — then double the spacer and hand X-band right back.</p>
  </a>
</div>