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参数资料
| 型号： | ANT-2.4-JJB-ST |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 2/2页 |
| 文件大小： | 342K |
| 描述： | ANTENNA 2.45GHZ 7MM STRAIGHT |
| 产品目录绘图： | ANT-xxx-JJB-ST |
| 标准包装： | 200 |
| 系列： | JJB - Antenna Factor |
| 天线类型： | 鞭状：1/4 波，固定式 |
| 频带数目： | 1 |
| 频率： | 2.45GHz（2.425GHz ~ 2.475GHz） |
| VSWR： | 3 |
| 端子： | 直接焊接 |
| 安装类型： | 底座安装 |
| 高度（最大）： | 0.69"（17.6mm） |
| 包装： | 散装 |
2
Counterpoise
Quarter-wave or monopole antennas require an associated ground plane
counterpoise for proper operation. The size and location of the ground
plane relative to the antenna will affect the overall performance of the
antenna in the final design. When used in conjunction with a ground
plane smaller than that used to tune the antenna, the center frequency
typically will shift higher in frequency and the bandwidth will decrease.
The proximity of other circuit elements and packaging near the antenna
will also affect the final performance. For further discussion and guidance
on the importance of the ground plane counterpoise, please refer to Linx
Application Note AN-00501: Understanding Antenna Specifications and
Operation.
by
Data Sheet ANT-2.4-JJB-xx
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 reflected back from the load. A perfect
match will have a VSWR of 1:1. The higher the first number, the worse the
match, and the more inefficient 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 reflected 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 first 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 specifies the recommended bandwidth as the range
where the typical antenna VSWR is less than 2:1.
VSWR
Reflected Power
3:1
2:1
1:1
25%
11%
0%
1.403
CENTER 2.450GHz ST
CENTER 2.450GHz RA
SPAN 200.000MHz
1.307
相关PDF资料 |
PDF描述 |
|---|---|
| ANT-2.4-OM-CM-01-N | 2.45GHZ GAIN ANT N-TYPE |
| ANT-2.4-PW-QW | ANTENNA 2.4GHZ 1/2 WAVE DIPOLE |
| ANT-2.4-WRT-UFL | ANTENNA U.FL 2.45GHZ CENTER |
| ANT-2.4-YG12-N | ANTENNA YAGI 2.4GHZ 12-ELEMENT |
| ANT-2.4-YG6-N | ANTENNA YAGI 2.4GHZ 6-ELEMENT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ANT25 | 制造商:CIT 制造商全称:CIT Relay & Switch 功能描述:CIT SWITCH |
| ANT2525B00BT1516A | 功能描述:天线 1575-1602MHz 50 Ohm PATCH ANTENNA,GPS 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 |
| ANT2525B00BT1516S | 功能描述:1.6GHz GLONASS, GPS Ceramic Patch RF Antenna 1.575GHz ~ 1.606GHz 3.5dBic, 4.1dBic Solder Surface Mount 制造商:yageo 系列:- 包装:托盘 零件状态:有效 频率组:UHF（1 GHz ~ 2 GHz） 频率（中心/带）:1.6GHz 频率范围:1.575GHz ~ 1.606GHz 天线类型:陶瓷贴片 频带数:1 VSWR:2 回波损耗:- 增益:3.5dBic，4.1dBic 功率 - 最大值:- 特性:- 端接:焊接 侵入防护:- 安装类型:表面贴装 高度（最大值）:0.157"（4.00mm） 应用:GLONASS，GPS 标准包装:40 |
| ANT2525B00BT1575A | 功能描述:天线 1.575MHz 50 Ohm PATCH ANTENNA,GPS 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 |
| ANT2525B00BT1575S | 功能描述:1.6GHz Ceramic Patch RF Antenna 1.57GHz ~ 1.59GHz 5.5dBic Solder Surface Mount 制造商:yageo 系列:- 包装:托盘 零件状态:有效 频率组:UHF（1 GHz ~ 2 GHz） 频率（中心/带）:1.6GHz 频率范围:1.57GHz ~ 1.59GHz 天线类型:陶瓷贴片 频带数:1 VSWR:2 回波损耗:-39dB 增益:5.5dBic 功率 - 最大值:- 特性:- 端接:焊接 侵入防护:- 安装类型:表面贴装 高度（最大值）:0.157"（4.00mm） 应用:- 标准包装:40 |
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