Inset Feed Calculator [portable] Instant
<div id="errorMsg" class="error" style="display: none;"></div>
<button onclick="calculateInset()">Calculate Inset Depth (y₀)</button> inset feed calculator
<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> div id="errorMsg" class="error" style="display: none
// If user entered in mm (common) but L is large > 0.1 and < 1000, assume mm if (L > 10 && L < 1000) // L in mm already displayUnit = "mm"; displayVal = y0; else if (L < 0.1) // L in meters, convert to mm for readability displayVal = y0 * 1000; displayUnit = "mm"; else displayUnit = (L > 1000) ? "m" : "m"; Calculate Inset Depth (y₀)<
<div id="resultArea" class="result" style="display: none;"> <div style="font-weight: 600;">📌 Inset from edge</div> <div class="result-value" id="insetValue">—</div> <div id="insetUnit"></div> </div>
For a rectangular patch antenna with an inset feed:
