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Join Date: Feb 2016
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RF Continuous Wave Signal Source at the ISM Frequency of 13.56MHz

02/22/2016 12:29 PM

hello all I'm needing help with a project I was assigned and here it is:Design a engineered continuous wave signal source at the ISM frequency of 13.56Mhz. This will be for a closed (non-signal radiating) application. Power level of at least 10 watts into a 50 ohm non reactive load , an appropriate RF WATTMETER and dummy load for testing the power level should be used. I not sure how to approach this project, meaning like designing it, components, what type of power source to use, etc. Would greatly appreciate comments

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Guru
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#1

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 12:44 PM

Miss a fair amount of class time did you?

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Participant

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#2
In reply to #1

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 12:52 PM

not just need a some help understanding this project a little new to the RF world

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Guru

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#3

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 12:54 PM

I'm thinking this is for bench testing rfid tags in livestock management....

http://www.sciencedirect.com/science/article/pii/S0168169915000459

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#4
In reply to #3

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 12:58 PM

what? this is just a project I need to do for school so I just looking to be put in the right direction and I'm what you mentioned is not it

thanks though

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#5
In reply to #4

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 1:11 PM

What you are describing is a bench testing rig for RFID tags generally used in livestock management....so this info is intended as a starting place for you to look for methods of construction to meet your requirements...

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#6
In reply to #5

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 1:53 PM

How is he suppose to turn something in to his school if you keep giving him educational material to read?

If he wanted to learn he would have done it himself!

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#8
In reply to #6

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 2:15 PM

Trade school not looking so bad now?

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#7

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 2:01 PM

What you need first is to design a RF 10-15 Watts transmitter, or just buy one.

Connect this to your load/antenna/dump and put your RF watt meter in the circuit.

Depending on the shape of the desired signal, you could work with an oscillator or generate your RF digitally.

I just don't get the "closed" nature of it, because all your used components will be radiating something, unless you encase it all properly.

In that case however, one can argue what is the purpose of your exercise.

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Guru

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#9

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 2:20 PM

How will you handle this assignment in real life?

You are not off to a good start.

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#10
In reply to #9

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 10:17 PM

This is a tough technical job interview question "How will you handle your assignment in real life". Worth a GA, nope, GQ - "Good Question"

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Guru

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#11
In reply to #10

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/22/2016 10:49 PM

This question must be answered before OP ever applies for a job.

I've hired all manner of engineers in the last 35 years.

Even entry level engineers had better know how to find answers. Especially in today's IT rich world.

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Power-User

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#13
In reply to #11

Re: RF Continouous Wave Signal Source at the ISM frequency of 13.56Mhz

02/23/2016 2:39 AM

I agree, Lyn.

I've seen a job worth $500, using continuous wave analysis on an application instead of Fourier's on a freelance site. I bet OP's just fishing.

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#12

Re: RF Continuous Wave Signal Source at the ISM Frequency of 13.56MHz

02/23/2016 1:06 AM

Try the part of the circuit inside the box posted by lyn to generate the signal

You will need an amplifier to get it up to 10W

A 30V supply of at least 1A should do you

Good Luck!

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Guru
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#14

Re: RF Continuous Wave Signal Source at the ISM Frequency of 13.56MHz

02/23/2016 7:19 AM

10W 13.56 MHz into 50 ohms requires about 25V signal with 500mA drive capacity. You can easily get 10-15W 50-ohms resistance as dummy load. Look at Mini Circuits for it.

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Anonymous Poster (1); dvmdsc (1); lyn (2); Mr. small (2); musclemania05 (2); North of 60 (1); Shyam (1); SolarEagle (3); zzorb (1)

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