# Lesson 26 — Aircraft RF Signature

<p class="block-synopsis">An aircraft's radar signature is not one number but a budget of contributors — cavities, apertures, speculars, edges, and seams. This lesson assigns each one a design verdict and prices the fix with the fourth-root law.</p>

<div class="block-toc">
  <a class="bt-card bt-reading" href="L26_AircraftRFSignature_Reading.html">
    <span class="bt-kind">Reading</span>
    <h4>Aircraft RF Signature</h4>
    <p>The signature contributors, the shape/mask/treat/manage verdicts, planform alignment, and the loudest-first RCS budget.</p>
  </a>
  <a class="bt-card bt-flashcards" href="L26_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="L26_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-%20B3L26%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="L26_PlanformAlignment_Demo.html">
    <span class="bt-kind">Demo</span>
    <h4>Planform Alignment</h4>
    <p>Collapse six scattered edge normals into two and watch the loud fraction of the compass fall while the surviving lobes grow taller.</p>
  </a>
</div>
