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Sounds like you need to set the output load lower using resisters so your mixer loading won't affect the LNA performance. By doing this, you'll also increase your bandwidth somewhat by lowering the Q of the tank. However, you'll probably need to use more current now to increase the LNA gain to...
stacked lc filter
Is your PCB material FR4? FR4 material is extremely inconsistent in its dielectric constant. Also, it's stacked layer thickness varies from different vendors.
looks like a triplexer. Looks like each individual filter uses a coaxial line for non-adjacent coupling to increase rejection.
Added after 15 seconds:
looks like a triplexer. Looks like each individual filter uses a coaxial line for non-adjacent coupling to increase rejection.
Here is a free software you can download from the pcb fab house.
www.pcb123.com
If you want to do printed filters or antennas, you'll have a hard time.
Re: in 100Mhz out 500Mhz
You should already have your 500MHz sinwave if you have a 100MHz square wave since 500MHz sine is a component of 100MHz square wave(review fourier series). If you would like to filter out the other harmonics, pass the the 100MHz square wave though a bandpass filter...
Re: What is shim
They Are probably refering to a thin, flexible piece of metal. You can cut them into smaller pieces an solder them to your printed circuit board for adjusting the L's and the C's of your printed traces. They can also form walls to block radiation and decouple nearby circuits.
You can try polypropylene (PP). It will not be as durable as polycarbonate (PC) or ABS, but it has better electrical properties such as lower loss tangent and lower dielectric constant. Sonoco is a major supplier of various PP. The best thing to do is to redesign your antenna for a specific...
how to measure inductance of coil
1. Make a series shunt resonator of your coil with a known capacitor.
2. connect one end to the source and the other to the oscope.
3. find frequency where signal has the least loss.
4. with known resonant frequency and capacitor, you can now calculate your...
The way you've drawn the circuit already suggests coupling between the end resonators. If the center conductor of the end resonators are moved closer to the top and the center conductor of the middle resonator is moved closer to the bottom, then the end resonators will 'see' each other better...
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