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Only narrow band filters? No. A properly designed resonator filter can give a BW of 15 - 20%, just like "regular" filters. Most microwave filters only use resonators. Resonators are used for the high Q, which will lead to lower insertion loss, since there is less loss in the resonator...
What you're missing is that you don't seem to understand decibels. If you take a 100watt amplifier and combine it with another 100watt amplifier, you get 200watts out (assuming all losses), or you have DOUBLED YOUR POWER!!. If you double your power, the power gain is 3dB. The output power...
Re: HFSS - 50 Ohm Coaxial line terminated with 50 Ohm impedance boundary. |S11| too l
Why is your center conductor hollow?
Where is your energyzing port?
I'm not sure that the impedance boundary is designed to be used like that.
You might want to specify your own resistive material for your...
My philosophy of grounding is to flood every possible mm² with ground copper and then connect all the grounds with many thru-hole vias. This makes the impedance of the grounds as low as possible. If you have high current areas, isolate the ground return path with "herding" cuts in all the...
You don't state the impedance of your stripline, but assuming it is 50 ohms, make the power line as high impedance as is practical, ie, make it thick enough to carry the proper current, but thin enough to be higher impedance. Strive to make this impedance at least 200 ohms at 390MHz. Where the...
Select an output device that has a breakdown voltage as high as possible. It's not overheating that usually kills the device, but instead is the breakdown voltage being exceeded during high VSWR situations. Your idea of using a much higher power device has merit. I would start at 2X, build...
It depends on what is creating the harmonics. A Class C amplifier has harmonics that are non-linear, so sometimes they go up and sometimes they go down.
You start by dumping the DOS program and get something from at least the early 2000's. The difference between RS-274-D and RS-274-X, is that the -D version requires an aperature table that must be manually input by the vendor. The -X version has the aperatures embedded in the encoding. It is...
I use to hire RF engineers. If all they came in with was "I was in an amateur radio club" they wouldn't have gotten in the door. Nowadays, you almost have to have an advanced degree (MSEE) to even be considered.
I'm with biff44 in that a Drive Tester is simply a field strength surveyor, driving around town with equipment set up by an RF engineer doing all the work.
But the airport job is also not likely to give you RF engineering creds either. These you get only with advanced electromagnetic studies...
The red dye test tests your processes. If there are no failures, then your processes are in line with your production goals. It is when your failures exceed a stated goal do you need to test your processes. X-ray is generally useless in determining solder joints under a BGA, as is optical...
The ones that are able to be seen look good enough - there is wetting on both sides of the joint. The standard test for determining what you want is called a "red dye" test. Red dye is flooded under the part and left to dry, then a one pound or so weight is mechanically attached to the top of...
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