Engineering Tool · closed-form · advisory
Bandwidth
BW = (f / Q) · (SWR − 1) / √SWR
2.0:1 SWR bandwidth
389kHz
Lower edge
6.956MHz
Upper edge
7.344MHz
Fractional
5.44%
Accuracy note
Single-resonance (lumped RLC) approximation. A real antenna's bandwidth depends on its exact geometry and environment; use this as a first estimate, not a spec. Half-power (−3 dB) BW = f/Q = 550 kHz.
Single-resonance (lumped RLC) approximation. A real antenna's bandwidth depends on its exact geometry and environment; use this as a first estimate, not a spec. Half-power (−3 dB) BW = f/Q = 550 kHz.
Method closed-form Cite ARRL Antenna Book