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N15X12E470X PDF预览

N15X12E470X

更新时间: 2024-11-25 23:53:07
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其他 - ETC 射频
页数 文件大小 规格书
16页 729K
描述
RF Coaxial Lightning & EMP Protection

N15X12E470X 数据手册

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1307062  
RF Coaxial Lightning & EMP  
Protection  
In-line RF Coaxial Protection Against Lightning & EMP  
Ideal Protection for Cellular Infrastructure Equipment  
Available in ␭ր4 Stub Tuner or Gas Discharge Tube  
Formats  
Maintains Protection after Initial Strike or Pulse  
M/A-COM offers a complete series of RF Coaxial Lightning &  
EMP Protection Devices for use in cellular infrastructure appli-  
cations. EMP (electro-magnetic pulse) occurs primarily as a  
result of direct lightning strikes to infrastructure equipment  
which can produce fast rising electric fields within micro  
seconds. These electric fields induce high voltage pulses  
through unprotected antennas and coaxial transmission cables  
which can ultimately lead directly to the primary communica-  
tion equipment. The EMP threat, generated from unpredictable  
lightning strikes is a serious concern for cellular operators  
around the world. Damage from a lightning strike can result in  
costly repair of equipment as well as significant loss of airtime  
service to subscribers.  
/4 Stub Tuners  
l/4 stub tuners are three port coaxial devices. The third port,  
extending from the main electrical path, serves as a terminated  
short circuit element at a predetermined distance from the RF  
transmission path. This distance is designed to be exactly one  
quarter wavelength at the desired centering frequency (Fo). l/4  
stub tuners offer very low VSWR and feature very high attenu-  
ation of incoming pulses but must be applied across relatively  
narrow bandwidths (± 70 MHz). M/A-COM offers standard  
designs for the most popular cellular frequency bands to  
facilitate usage without the need for a custom design. Stub  
tuners offer the greatest protection for sensitive electronic  
components as they have neither the sparkover or residual  
voltage characteristics of GDT devices. Stub tuners are  
extremely reliable and maintenance free since they incorpor-  
ate no active components. Standard stub tuner designs exist  
for GSM, PCS 1900 and DCS 1800 frequencies with a wide  
variety of connector interfaces such as Type N and 7-16  
available. Cable assemblies, including low loss cable options,  
are also available to provide complete in-line solutions for base  
station design.  
M/A-COM RF coaxial lightning protection (LP) devices have  
been designed for use in commonly deployed cellular infra-  
structure including GSM, NAMPS, PCS 1900 and DCS 1800  
operating formats. The use of coaxial lightning protection has  
two primary benefits for cellular applications. First, RF coaxial  
lightning protection can easily be inserted into existing infra-  
structure architecture either as a cable assembly or as an  
in-line adapter. This facilitates cell site design and retrofit  
capabilities. Secondly, the RF coaxial protection has been  
designed to facilitate and not degrade RF performance during  
normal operation of the system.  
Surge Protectors  
These devices incorporate internal gas discharge tube (GDT)  
technology to provide a low impedance path to discharge the  
EMP to ground. The GDT is hermetically sealed with an inert  
gas which is not radioactive and requires no special handling.  
GDT devices are broadband due to their inherently small  
capacitance and cover frequencies up to 2.5 GHz. Once a  
GDT device has been activated with an impulse and the  
voltage level dissipated, the device becomes inactive and will  
require subsequent maintenance or replacement. Surge  
protectors are available in convenient bulkhead mounting  
configurations with a wide variety of standard interface choices  
including Type N, 7-16 and SMA.  
Call your local M/A-COM sales office or global Applications  
Engineering group for more information on our RF coaxial  
lightning protection. M/A-COM is an ISO-9001 globally  
certified manufacturer.  
V5.00  
M/A-COM Division of AMP Incorporated North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel. +85 2 2111 8088, Fax +85 2 2111 8087  
Europe: Tel. +44 (1344) 869 595, Fax +44 (1344) 300 020  
www.macom.com  
AMP and Connecting at a Higher Level are trademarks.  
Specifications subject to change without notice.  

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