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Hi thanks for response
I know that every antenna works at certain frequency
But my question is that why the length of the antenna is related to the wave frequency
I mean is that any relation that gives us sinusoid distribution along half wave dipole ?
Or how can we get how is the current...
Hi
Why the current distribution of a half wave dipole antenna is sinusoid ?
I mean how the length of the antenna is related to the wave period ?
Is there a formula for get this result ?
Hi all
I have a question about GSM modems
I have a avr micro and have a variable with some value
I want to send these values to my web host database table .
I'm not familiar with GSM modems
I know that need a gprs connection . but how can send a variable with sim900 and save it on DB ?
Also...
I can not get my answer
If I have fc1=100Mhz , fc2=200Mhz , fc3=300Mhz for example (cutoff frequencies)
so my dominant mode n=1 and I have fc1=100Mhz so for f<fc I have no propagation
if I have f=150Mhz I am on n=1 mode
if I have f=250 Mhz I have n=1,2 together right ?
So my frequency specify...
Hi all
As you know we have modes in wave guides
For example in parallel plate TM mode we have
h=nΠ/b , fc=n/2b(µε)^0.5
my question is that how do this modes change ?
We have n=1 , fc=1/2b(µε)^1/2
n=2 , fc=1/b(µε)^1/2 and so on
They change with my operation frequency ?
for example...
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