ANT-433-MHW-RPS-S【PDF 2/3 页】ANTENNA 433MHZ CENTR FED 79" SMA

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Sheet目录50

1页 [2页]3页

SWR

Reflected Power

3:1

2:1

1:1

25%

11%

433MHz

498MHz

368MHz

1.18

VSWR Graph

What is VSWR?

The Voltage Standing Wave Ratio (VSWR) is a measurement of how well

an antenna is matched to a source impedance, typically 50-ohms. It is

calculated by measuring the voltage wave that is headed toward the load

versus the voltage wave that is re ected back from the load. A perfect

match will have a VSWR of 1:1. The higher the rst number, the worse the

match, and the more inef cient the system. Since a perfect match cannot

ever be obtained, some benchmark for performance needs to be set. In

the case of antenna VSWR, this is usually 2:1. At this point, 88.9% of the

energy sent to the antenna by the transmitter is radiated into free space

and 11.1% is either re ected back into the source or lost as heat on

the structure of the antenna. In the other direction, 88.9% of the energy

recovered by the antenna is transferred into the receiver. As a side note,

since the :1 is always implied, many data sheets will remove it and just

display the rst number.

How to Read a VSWR Graph

VSWR is usually displayed graphically versus frequency. The lowest point

on the graph is the antennas operational center frequency. In most cases,

this will be different than the designed center frequency due to fabrication

tolerances. The VSWR at that point denotes how close to 50-ohms the

antenna gets. Linx speci es the recommended bandwidth as the range

where the typical antenna VSWR is less than 2:1.

Data Sheet ANT-433-MHW-xxx-x

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