Quantcast CHARACTERISTIC IMPEDANCE OF A TRANSMISSION LINE

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
3-14 CHARACTERISTIC IMPEDANCE OF A TRANSMISSION LINE You learned earlier that the maximum (and most efficient) transfer of electrical energy takes place when the source impedance is matched to the load impedance. This fact is very important in the study of transmission lines and antennas. If the characteristic impedance of the transmission line and the load impedance are equal, energy from the transmitter will travel down the transmission line to the antenna with no power loss caused by reflection. Definition and Symbols Every transmission line possesses a certain CHARACTERISTIC IMPEDANCE, usually designated as Z0. Z0 is the ratio of E to I at every point along the line. If a load equal to the characteristic impedance is placed at the output end of any length of line, the same impedance will appear at the input terminals of the line. The characteristic impedance is the only value of impedance for any given type and size of line that acts in this way. The characteristic impedance determines the amount of current that can flow when a given voltage is applied to an infinitely long line. Characteristic impedance is comparable to the resistance that determines the amount of current that flows in a dc circuit. In a previous discussion, lumped and distributed constants were explained. Figure 3-15, view A, shows the properties of resistance, inductance, capacitance, and conductance combined in a short section of two-wire transmission line. The illustration shows the evenly distributed capacitance as a single lumped capacitor and the distributed conductance as a lumped leakage path. Lumped values may be used for transmission line calculations if the physical length of the line is very short compared to the wavelength of energy being transmitted. Figure 3-15, view B, shows all four properties lumped together and represented by their conventional symbols. Figure 3-15.—Short section of two-wire transmission line and equivalent circuit. Q19.   Describe the leakage current in a transmission line and in what unit it is expressed.


Electrical News
ESC Boston 2015 Sneak Peek! Embedded Systems That Glow in the Dark
At ESC Boston 2015, Max Maxfield will be giving a...
eetimes.com
Know Your Open Source License
If you think open source means unrestricted use, you need...
eetimes.com
Delphi Selected to Build Audi's Autopilot Computer
Automated driving is ante portas - but how will the...
eetimes.com
10 Greatest Hoaxes in the History of Engineering
From faux innovations, to fake artificial intelligence, to an Internet-ready...
eetimes.com
Analog EDA Finally Automated
Reutlingen University has created automated techniques for designing analog circuits,...
eetimes.com
IoT Snags $25M in Europe
EuropeCPS aims to spend $25 million over three years helping...
eetimes.com
Festival Redesigns San Francisco
The Market Street Prototyping Festival will transform downtown San Francisco's...
eetimes.com
Mixed-Signal Oscilloscopes to Invade ESC Boston
Designers of embedded systems need to test and troubleshoot designs...
eetimes.com
Net-Zero Homes: Powered By Dreams?
A home that generates more power than it uses sounds...
eetimes.com
KIT, Schaeffler Optimize Power Steering for Electric Cars
A joint research project from mechatronics company Schaeffler AG and...
eetimes.com
Medical Chip Market on 12% CAGR
Moves to smaller and portable medical equipment for use away...
eetimes.com
Philips Offloads LED Lighting Components Unit for $2.8 Billion
Philips has agreed to sell an 80.1 percent stake in...
eetimes.com
Toshiba Ups Ante in 3D NAND Fray
Toshiba's 48-layer BiCS technology will be a stepping stone for...
eetimes.com
3D Qualcomm SoCs by 2016
Qualcomm is doing extensive research into how to build 3D...
eetimes.com
Juggling Data Connectivity Protocols for Industrial IoT
With much legacy equipment existing with older protocols and requiring...
eetimes.com
IoT Sensor Networks Seek Routes
Sensor networks for the Internet of Things present some unique...
eetimes.com
eevBLAB #8 – New Tektronix AGO3000 Oscilloscope
Dave talks about Tektronix’s new unreleased AGO3000 Gravity Compensated Oscilloscope...
eevblog.com
Graphene's First Commercial Success: Energy-Saving Light Bulbs?
The first commercially viable consumer product to use graphene will...
eetimes.com
Samsung Galaxy S6 Edge: Night At The Museum
We took our review model for a whirl at the...
eetimes.com
Power & Signal Over A Single Wire Do More With Less
If power together with signal is your goal, there are...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +