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Hello !!!
I have to make a project and one of my tasks is, to calculate the open voltage of the antenna ! If we can say that the equivalent circuit of an antenna in transmit mode is a Voltage source with a Zantenna in a given frequency, i undertand that if i have a Zload=0. this is the open...
Hello to everyone,
i am using IE3D to simulate an antenna. I will use for conductor Gold or Copper.
I am searching about relative constant and Loss tangent δ. Ιs anyone knows
these value in Microwave Band? Also, in optical frequencies is there any significant
deviation ?
Bests,
George
Okay i will do what you say! About the books... can i have the exact title of the books ?
ARRL HANDBOOK Experimental method in RF Design. this one?https://www.amazon.com/Experimental-Methods-Design-Wes-Hayward/dp/087259923X
i don't have a lot money.it worth for me ? i am a begginer...
Radcom...
Dear Dan you are very helpful. Are you academic- you have students?
Well, i understand the problem of mis-match at the output of mixers. He need to match with 50ohm, to work properly. In my case he don't. It is understood. I confused, because, at the audio system i know that the RLoad (in...
I undertand what you are telling to me..but. If i want to write down "the Total Gain of my Receiver".what can i do for this? Please, enter in google "Receiver Architectures - Springer" it is a pdf 44 pages with Title Chapter 2 Receiver Architectures. Go on chapter 2.6 page 37 to 39.
How i can...
Yes i understand what are you saying.But when you have a receiver chain you want to calculate the Power Gain of total chain. It is very practical. Please, take a loo here : enter in google "Receiver Architectures - Springer" it is a pdf 44 pages with Title Chapter 2 Receiver Architectures. Go on...
Yes exactly!
I am confused now. I want to do a cascade power gain... Lna (Zin=50,15dB,Zout=50) + filter(Zin=50,-3dB,Zout=50) +mixer (Zin=50,-8dB,Zou=50)+active filter(Zin=?,voltage gain 20dB,Zout=?)
to convert is to power gain is 20log(Vout/Vin)=20log(PoutZout/PinZin)^(1/2). that's why i want...
okay now i believe it is ok?
I do an exercise with a RF Receiver.
Before this filter there is a double balanced ring diode mixer that downconvert a signal of 30MHz to a baseband. The mixer's output (ideally) is 50ohm.
RF front....---Mixer-----Active Filter--Demodulator (DSP). I want to...
Yes the Sallen-key is a unity gain amp Voltage Gain=1. About the Amplifier Stage there is a jumper of 2 option. First option's Gain is =R11/R13=10K/3,3K=3 and Second OPTion's gain is VARIABLE ( i have a potensiometer). So, let's say that is Gain=3. Reject the potensiometer. Maybe i can use KCL...
Hi and many thanks for your reply! I will give more information about my question on the schematic.
So the frequency bandwidth is DC to 17khz (audio)! Before this filter there is a double balanced ring diode mixer that downconvert a signal of 30MHz to a baseband DC to 17khz. The mixer's output...
Hi again. Basically, i am almost sure that you are all wrong about why this problem came up. Except RCinFLA ! He was right. The problem was with the matching at the input and output ports.
This is the band pass that i use **broken link removed**
and this is the cavity filter i use **broken link removed**
So, you don't believe the problem is about group delay... it make sense, to be true, because indeed the bw of information is so "short"
The insertion loss of cavity is really greater but only 1 to 1.5dB. I don't think is so critical. I don't see any great difference with the specifications of the filter..
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As i understand the are reflected waves from the cavity. LNA gain is 15dB and NF=0.76dB , mixer...
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