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| 型号： | RXM-869-ES_ |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | RECEIVER RF 869MHZ 16PIN SMD |
| 标准包装： | 25 |
| 频率： | 869MHz |
| 灵敏度： | -102dBm |
| 数据传输率 - 最大： | 56 kbps |
| 调制或协议： | FM，FSK |
| 电流 - 接收： | 6.5mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-SMD |
| 供应商设备封装： | 模块 |
| 包装： | 管件 |
| 其它名称： | RXM-869-ES RXM-869-ES_-ND |
GENERAL ANTENNA RULES
The following general rules should help in maximizing antenna performance.
1. Proximity to objects such as a user’s hand, body, or metal objects will cause an
antenna to detune. For this reason, the antenna shaft and tip should be
positioned as far away from such objects as possible.
2. Optimum performance will be obtained
from a 1/4- or 1/2-wave straight whip
mounted at a right angle to the ground
plane. In many cases, this isn’t desirable
for practical or ergonomic reasons, thus,
an alternative antenna style such as a
OPTIMUM
U S ABLE
NOT RECOMMENDED
helical, loop, or patch may be utilized
Figure 19: Ground Plane Orientation
and the corresponding sacrifice in performance accepted.
3. If an internal antenna is to be used, keep it away from other metal components,
particularly large items like transformers, batteries, PCB tracks, and ground
planes. In many cases, the space around the antenna is as important as the
antenna itself. Objects in close proximity to the antenna can cause direct
detuning, while those farther away will alter the antenna’s symmetry.
4. In many antenna designs, particularly 1/4-wave
whips, the ground plane acts as a counterpoise,
VERTICAL λ /4 GROUNDED
ANTENNA (MARCONI)
forming, in essence, a 1/2-wave dipole. For this
E
DIPOLE
ELEMENT
reason, adequate ground plane area is essential.
The ground plane can be a metal case or ground-fill
areas on a circuit board. Ideally, it should have a
surface area > the overall length of the 1/4-wave
I
GROUND
PLANE
λ /4
radiating element. This is often not practical due to
size and configuration constraints. In these
VIRTUAL λ /4
DIPOLE
λ /4
instances, a designer must make the best use of the
area available to create as much ground plane as
Figure 20: Dipole Antenna
possible in proximity to the base of the antenna. In cases where the antenna is
remotely located or the antenna is not in close proximity to a circuit board,
ground plane, or grounded metal case, a metal plate may be used to maximize
the antenna’s performance.
5. Remove the antenna as far as possible from potential interference sources. Any
frequency of sufficient amplitude to enter the receiver’s front end will reduce
system range and can even prevent reception entirely. Switching power
supplies, oscillators, or even relays can also be significant sources of potential
interference. The single best weapon against such problems is attention to
placement and layout. Filter the module’s power supply with a high-frequency
bypass capacitor. Place adequate ground plane under potential sources of noise
to shunt noise to ground and prevent it from coupling to the RF stage. Shield
noisy board areas whenever practical.
6. In some applications, it is advantageous to
place the module and antenna away from the
main equipment. This can avoid interference
CA S E
problems and allows the antenna to be
oriented for optimum performance. Always use
NUT
GROUND PLANE
(MAY BE NEEDED)
50 Ω coax, like RG-174, for the remote feed.
Figure 21: Remote Ground Plane
Page 15
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相关代理商/技术参数 |
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| RXM-869-ES_ | 功能描述:RECEIVER RF 869MHZ 16PIN SMD RoHS:是 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| RXM-900-HP3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:HP3 SERIES RECEIVER MODULE DATA |
| RXM-900-HP3-PPO | 功能描述:射频模块 RF Receiver 900MHz 8-CH SIP Pack RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| RXM-900-HP3-PPO_ | 功能描述:RECEIVER RF 900MHZ 8-CHANNEL RoHS:是 类别:RF/IF 和 RFID >> RF 接收器 系列:HP3 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| RXM-900-HP3-PPS | 功能描述:射频模块 RF Receiver 900MHz 8 & 100-CH SIP Pack RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
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