2
by
Data Sheet ANT-418-MHW-xxx-x
SWR
Reflected Power
3:1
2:1
1:1
25%
11%
0%
418MHz
473MHz
353MHz
1.687
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.
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相关PDF资料
ANT-418-PW-LP
ANTEN 418MHZ PRMNT 1/4 WAVE WHIP
ANT-418-PW-QW
ANTEN 418MHZ PRMNT 1/4 WAVE WHIP
ANT-418-PW-RA
ANT 418MHZ PRMNT SA 1/4 WAV WHIP
ANT-418-YG5-N
ANTENNA YAGI 418MHZ 5-ELEMENT
ANT-433-CW-HD
ANTENNA 433MHZ 1/4 WAVE WHIP
ANT-433-CW-HWR-SMA
ANTENNA 433MHZ 1/4 WAVE SMA
ANT-433-CW-HW
ANTENNA 433MHZ 1/4WAV WHIP RPSMA
ANT-433-CW-QW
ANTENNA 433MHZ 1/4 WAVE WHIP
相关代理商/技术参数
ANT-418-MHW-SMA-S
功能描述:天线 418MHz MHW Dipole SMA, 79’’ Cable
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W
ANT-418-PW-LP
功能描述:天线 Perm Mnt Reducd Ht 1/4 Wave Whip 418MHz
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W
ANT-418-PW-QW
功能描述:天线 Permanent Mount 1/4 Wave Whip 418MHz
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W
ANT-418-PW-QW-UFL
功能描述:418MHz Whip, Straight RF Antenna 380MHz ~ 450MHz 2.9dBi Connector, U.FL Panel Mount 制造商:linx technologies inc. 系列:PW 包装:托盘 零件状态:有效 频率组:UHF（300 MHz ~ 1 GHz） 频率（中心/带）:418MHz 频率范围:380MHz ~ 450MHz 天线类型:鞭状，直形 频带数:1 VSWR:1.9 回波损耗:- 增益:2.9dBi 功率 - 最大值:- 特性:- 端接:连接器，U.FL 侵入防护:- 安装类型:面板安装 高度（最大值）:7.008"（178.00mm） 应用:- 标准包装:24
ANT-418-PW-RA
功能描述:天线 Perm Mnt Swvl Angle 1/4 Wave Whip 418MHz
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W
ANT-418-SP
功能描述:天线 SMD Planar Ant. 418MHz
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W
ANT-418-SP_
功能描述:ANTENNA 418MHZ PLANAR (SMT) RoHS:是 类别:RF/IF 和 RFID >> RF 天线 系列:SP - Antenna Factor 标准包装:1 系列:*
ANT-418-USP
功能描述:天线 MicroSplatch Planar Antenna 418MHz, SMD
RoHS:否 制造商:Molex 技术类型:Cellular Antenna 频率: 带宽: 尺寸:106.7 mm L x 13 mm W