random-random

random-duck

Published

The sweep

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.
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.

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The context record

Record

Identifier
25f5e1dd-0e50-49e6-a106-5da70ededae6
Antenna
random-random
Title
random-duck
Submitted by
Peter Grace
Moderation
Published
Uploaded
2026-09-01 01:13:54.594017 UTC

Mounting

Ground plane
Not recorded
Ground plane size
Not recorded
Height above ground
Not recorded
Orientation
Not recorded
Mount method
Not recorded

Instrument

Analyser
Not recorded
Calibration
Short-open-load, one port
Reference plane
Not recorded
Sweep points
Not recorded
IF bandwidth
Not recorded

Feedline

Cable
Not recorded
Cable length
Not recorded
De-embedding
Feedline de-embedded: the sweep is referred to the antenna itself.

Conditions

Environment
Not recorded
Nearby structures
Not recorded
Temperature
Not recorded
Measured on
Not recorded

Figures

Resonance
913.84 MHz
Minimum SWR
1.398:1
Bandwidth below 2:1
25.92 MHz
Coverage from
700 MHz
Coverage to
1.024 GHz

In the submitter's words

Notes
Not recorded