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SWR at resonance
1.398:1
Resonance
913.84 MHz
Bandwidth below 2:1
25.92 MHz
Return loss
15.59 dB
Measurements
1
Record
Published
This measurement
Published
Smith chart, 700 MHz to 1.024 GHzReflection coefficient across 101 measured points, referred to 50 ohms. The centre is a perfect match and the outer circle is total reflection; points above the horizontal line are inductive and points below it are capacitive. Closest approach to the centre at 913.84 MHz, where the impedance is 56.069 ohms minus j16.778 ohms.
Reflection coefficient referred to 50 ohms. Inductive above the horizontal line, capacitive below.

Provenance

  • random-duck: measured by Peter Grace

    Feedline de-embedded: the sweep is referred to the antenna itself.

Frequency response

Standing wave ratio, 700 MHz to 1.024 GHzStanding wave ratio across 101 measured points. Best match 1.398:1 at 913.84 MHz. The shaded region marks 2:1 and below. Some points exceed 5:1 and are drawn clamped to the top of the axis.700 MHz800 MHz900 MHz1 GHz12345FREQUENCYSWR (n:1)

Clipped above 5:1

Return loss, 700 MHz to 1.024 GHzReturn loss in decibels across 101 measured points, drawn with zero at the top so a deeper null is lower. Deepest null -15.59 dB at 913.84 MHz.700 MHz800 MHz900 MHz1 GHz-40-30-20-100FREQUENCYRETURN LOSS (dB)
Impedance, 700 MHz to 1.024 GHzResistance and reactance in ohms across 101 measured points, referred to 50 ohms. Reactance crosses the zero line at resonance. At 913.84 MHz, the point of least reflection, resistance is 56.069 ohms and reactance -16.778 ohms. Some points fall outside the -150 to 150 ohm axis and are drawn clamped to its edges.700 MHz800 MHz900 MHz1 GHz-150-100-50050100150FREQUENCYIMPEDANCE (OHMS)

Clipped beyond 150 ohms

Resistance (solid) and reactance (dashed), referred to 50 ohms.

Measurements

Photographs

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