Looks like the doubler has a serious symmetry problem. The 2*f output is the strongest component, but just barely. And the level is also on the weak side.
That requires some serious microstrip filters. :-(
cheers, Gerhard
Sinewave purity isn't the norm at high frequencies. I've seen fancy HP rf sig gens with visible distortion too. They tend to proudly display low close-in spurs and ignore the stuff an octave up, or down in your case.
Can you use a coaxial ceramic resonator to clean it up?
Am 01.10.20 um 17:21 schrieb snipped-for-privacy@highlandsniptechnology.com:
That would be a dielectric resonator on 10 GHz. I have one in different oscillator in this box. I'm still struggling to get valid s-parameters from EM-simulations of the puck.
The synthesizer is there to provide a tuneable beat frequency. I've made a ring resonator to notch out the fundamental.
I've made a ring resonator that makes a nice trap for the fundamental. This one is scaled down to 3.5/7GHz since I'm VNA challenged.
<Board material is Rogers TMM6, 25mil. It has the consistency of cold wax, or of an eraser. Breaks when one looks hard at it.
The filter is self-etched. Laser-printed to foil and exposure on light-sensitive laquer. I have peeled away some copper on the top side so see if that has an effect. It had none.
Cheers, Gerhard
Looks like the surface-mount CCRs top out at about 10 GHz.
n 2535945536/ 2535945536/
Yep--and that is really pushing it. The upper limit used to be about 6 GHz not too long ago. This filter should be printed (planer). Gerhard already d id the fundamental trap as printed.
You can see elsewhere that IMC has stopped selling individual resonators (h ttps://
CTS does monoblock BPF, but they stop sub 8 GHz. CTS is for higher volume. I don't think muRata is even bothering with mono-block anymore. NTK used to have both monoblock and LTCC stuff, but seem to have dropped out of that b usiness altogether.
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