Inset Feed Calculator <No Sign-up>

<div id="errorMsg" class="error" style="display: none;"></div>

<div class="input-group"> <label>🔌 Feed line impedance, Z_feed (Ω)</label> <input type="number" id="zfeed" placeholder="e.g., 50" value="50"> <div class="hint">Usually 50 Ω for standard systems</div> </div> inset feed calculator

<hr> <div class="note"> <strong>Formula:</strong> y₀ = (L/π) · arccos(√(Z_feed / R_edge))<br> Valid when Z_feed ≤ R_edge. Typical matching range: 50Ω feed to 150–250Ω edge. </div> </div> div id="errorMsg" class="error" style="display: none

function showError(msg) let errDiv = document.getElementById('errorMsg'); errDiv.innerHTML = msg; errDiv.style.display = 'block'; document.getElementById('resultArea').style.display = 'none'; 🔌 Feed line impedance

For a rectangular patch antenna with an inset feed:

<button onclick="calculateInset()">Calculate Inset Depth (y₀)</button>

<div class="input-group"> <label>⚡ Edge resistance, R_edge (Ω)</label> <input type="number" id="redge" placeholder="e.g., 200" value="200"> <div class="hint">Typical range: 150–250 Ω (depends on width & substrate)</div> </div>