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
Learn Signal Integrity Online
Signal-integrity evangelist Eric Bogatin's classes are now available through an...
eetimes.com
25G Ethernet on Tap at IEEE
In the wake of a June launch for an industry...
eetimes.com
NAND Suit: Toshiba Seeks $1.1B From SK Hynix
South Korea's SK Hynix Inc. disclosed in a regulatory filing...
eetimes.com
Cloud-Based Chip Design Research & Education
Semiconductor Research and Silicon Cloud give chip designers global reach....
eetimes.com
Is Your Processor IP ISO 26262-Compliant?
With the growth in ADAS and the growing demand for...
eetimes.com
NI's System-on-Module Technology Aims to Reshape Embedded Market
National Instruments has just released a complete middleware solution for...
eetimes.com
XMOS Sees Key $26M Investment
UK chip designer XMOS has raised $26.2m from three global...
eetimes.com
VC Investments Spike in Q2
US companies posted double-digit increases in second-quarter investments from a...
eetimes.com
5G Calling: US Answers, Sorta
In the third and final part of our series on...
eetimes.com
Engineers Should Study Finance: 5 Reasons Why
Engineers make design decisions that affect the company bottom line,...
eetimes.com
EEVblog #642 – TI Connected Launchpad
Dave checks out the $20 TI EK-TM4C1294XL Tiva C Series...
eevblog.com
MIT Wrist-Robot Adds Extra Fingers
The Massachusetts Institute of Technology (MIT) has created a wrist-worn...
eetimes.com
OCZ Updates SQL Flash Accelerator
Toshiba-owned company makes flash acceleration simple for SQ L DBAs...
eetimes.com
Micro Python Preps for Mass Production
Micro Python is priming the presses. After smashing its Kickstarter...
eetimes.com
Do You Really Need 4 GB of RAM to Type a Letter?
The recent decision by the German parliament to consider a...
eetimes.com
Smart Grid Lessons From a Utility
A smart grid project in Sacramento provided many lessons, especially...
eetimes.com
Friday Quiz: Temperature Measurement
Try your hand at these questions about using temperature sensors...
eetimes.com
MSGEQ7-Based DIY Audio Spectrum Analyzer: Testing
Here's a step-by-step guide for testing a simple 14-band (2...
eetimes.com
17 More NASA Images of Beautiful Engineering
NASA is all about engineering. Here are 17 photos that...
eetimes.com
Telemedicine Guidelines Leave Plenty of Questions
Federation of State Medical Boards and American Medical Association telemedicine...
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 +