Instantly determine the crucial 3 dB bandwidth and cutoff frequencies (lower and upper) for your antenna designs using this precise online calculator. Optimize your RF system's performance and ensure accurate frequency response with ease, vital for antenna tuning and RF system design.
Formula:
The 3 dB Bandwidth (BW) and Cutoff Frequencies (flow, fhigh) are derived from an antenna's Resonance Frequency (f0) and Quality Factor (Q) using the following fundamental formulas:
- 3 dB Bandwidth (BW): BW = f0 / Q
- Lower Cutoff Frequency (flow): flow = f0 - (BW / 2)
- Upper Cutoff Frequency (fhigh): fhigh = f0 + (BW / 2)
Where:
- f0 = Resonance Frequency (in Hz, kHz, MHz, or GHz)
- Q = Quality Factor (a dimensionless measure of energy loss, indicating bandwidth)
- BW = 3 dB Bandwidth (the frequency range where power is at least half the peak)
- flow = Lower Cutoff Frequency (the frequency below f0 at -3 dB point)
- fhigh = Upper Cutoff Frequency (the frequency above f0 at -3 dB point)