Inset Feed Calculator ^hot^ May 2026
Solving for inset depth (y_0) from the edge:
<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>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Inset Feed Calculator – Patch Antenna</title> <style> body font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; max-width: 650px; margin: 40px auto; background: #f5f7fa; color: #1e2a3e; padding: 20px; .calculator background: white; padding: 25px 30px; border-radius: 20px; box-shadow: 0 10px 25px rgba(0,0,0,0.05); h1 font-size: 1.8rem; margin-top: 0; border-left: 5px solid #2c7da0; padding-left: 18px; .input-group margin-bottom: 20px; label display: block; font-weight: 600; margin-bottom: 8px; input width: 100%; padding: 10px; font-size: 1rem; border: 1px solid #cbd5e1; border-radius: 12px; box-sizing: border-box; .hint font-size: 0.8rem; color: #2c7da0; margin-top: 5px; button background: #2c7da0; color: white; border: none; padding: 12px 20px; font-size: 1rem; border-radius: 30px; cursor: pointer; font-weight: bold; width: 100%; margin-top: 10px; button:hover background: #1f5e7a; .result background: #eef2f5; padding: 18px; border-radius: 16px; margin-top: 25px; text-align: center; .result-value font-size: 2rem; font-weight: 800; color: #1e4a6b; .note font-size: 0.75rem; text-align: center; margin-top: 25px; color: #4b5563; .error color: #b91c1c; background: #fee2e2; padding: 10px; border-radius: 12px; margin-top: 15px; hr margin: 20px 0; </style> </head> <body> <div class="calculator"> <h1>📡 Inset Feed Calculator</h1> <p style="margin-bottom: 25px;">For rectangular patch antenna — find feed inset depth from the edge.</p> <div class="input-group"> <label>📏 Patch length, L (mm or m)</label> <input type="number" id="length" placeholder="e.g., 60" value="60"> <div class="hint">Typical: 40–80 mm for 2.4 GHz</div> </div> inset feed calculator
[ y_0 = \fracL\pi \cdot \cos^-1\left( \sqrt \fracZ_feedR_edge \right) ]
For a rectangular patch antenna with an inset feed: Solving for inset depth (y_0) from the edge:
function showError(msg) let errDiv = document.getElementById('errorMsg'); errDiv.innerHTML = msg; errDiv.style.display = 'block'; document.getElementById('resultArea').style.display = 'none';
<button onclick="calculateInset()">Calculate Inset Depth (y₀)</button> ⚡ Edge resistance
<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>