# Lesson 31 — Antennas

<p class="block-synopsis">Wavelength and antenna size, gain, dipoles and monopoles, dishes, and phased arrays.</p>

**Objectives covered**

- **3.3** — I can calculate the signal wavelength, antenna size, max antenna gain, and basic gain pattern for dipole, monopole, and parabolic dish antennas.

<div class="block-toc">
  <a class="bt-card bt-reading" href="../Block3Reading/Obj03/ECE215_B3_Obj03_Reading.html">
    <span class="bt-kind">Reading</span>
    <h4>Antennas</h4>
    <p>The course reading for Objective 3.3.</p>
  </a>
  <a class="bt-card bt-flashcards" href="L31_Flashcards.html">
    <span class="bt-kind">Flashcards</span>
    <h4>Review deck</h4>
    <p>Key terms, equations, and ideas from this lesson, in a self-test deck.</p>
  </a>
  <a class="bt-card bt-slides" href="../_static/slides/ECE_215_Lesson31.pdf">
    <span class="bt-kind">Slides</span>
    <h4>Lesson 31 deck</h4>
    <p>The slides used in class, as a PDF.</p>
  </a>
  <a class="bt-card bt-practice" href="../downloads.html">
    <span class="bt-kind">Practice Problems</span>
    <h4>Work these before the quiz</h4>
    <p>Ungraded problems with answers, on the downloads page.</p>
  </a>
  <a class="bt-card bt-demo" href="https://usafa-ece.org/apps/antenna-demo/" target="_blank" rel="noopener">
    <span class="bt-kind">Demo ↗</span>
    <h4>Antenna Demo</h4>
    <p>See how dipoles, monopoles, dishes, and arrays radiate.</p>
  </a>
</div>