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    • Inset Feed Calculator [2021] May 2026

    [ y_0 = \fracL\pi \cdot \cos^-1\left( \sqrt \fracZ_feedR_edge \right) ]

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

    For a rectangular patch antenna with an inset feed: Calculate Inset Depth (y₀)&lt

    <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> ⚡ Edge resistance

    [ R_in(y=y_0) = R_in(y=0) \cdot \cos^2\left(\frac\pi y_0L\right) ]

    <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>