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Not sure if this helps anyone, but I recently came up with a pretty clean highpass design that I haven't found out in the wild.
Requirements:
1) Printed filter (on 13.3 mil 4350 in this case)
2) Octave wide passband (~13-22 GHz)
3) Close in stop band(~11 GHz)
4) Good match (this goes in the...
To follow up:
As noted K>1 says stability but give no hint at how far outside the smith chart the stability circles are. Similarly if you get K<1 it doesn't give you much insight as to what to do, or where to do it.
On the other hand Mu and Muprime have direct relation and give great insight...
SOS!
As a followup:
A 1964 paper I ran across discusses really broadening the match similar to what I empirically came up with:
https://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1125812
I found that by using 1 or 2 roughly quarter wave sections of slightly wider waveguide at the launch...
Not sure about an article, but for any differential amplifier it is important to look at the stability circles in both differential and common mode (i.e. tie your inputs together and drive it with Port 1, and tie your outputs together and connect it to Port 2).
Make sure to look at all your...
How are you achieving the stripline? Is it clamped, or are you using a pre-preg layer to make the sandwich?
The 3.38 and 3.55 numbers are very confusing. Rogers does the same thing with 4350 (the flame retardent bearing version of 4003), listing 3.48 and 3.66. The lower value number is what...
Impedance matching = Minimizing reflections and maximizing gain
Power Matching = Optimizing the load line your power amp sees
Consider a common transistor amplifier with the output taken off the drain (or collector). The IV curves are very flat. Matching these to 50 Ohms would require...
Also, get it under a proper measuring microscope and see if it is actually etched per your design. Without proper callouts (and often even with them) board houses can be off by +/- 2-3 mils in line and space. Overetching would lead to higher center frequency and lower BW.
Lastly, models are...
Research microstrip to SIW (substrate integrated waveguide) launches. All literature I can find concentrates entirely on the microstrip side. None have solved the very ugly changes in Z0 near cutoff, leaving ~15% above cutoff with a pretty poor match. Investigate using flared sections of...
Most dividers output insufficent power to drive the LO of say a diode based mixer. many frequency dividers will output say 1 Vpp, while a burly mixer may require anywhere from 7-20 dBm of LO drive. The reverse isolation can keep your IF and RF signals from getting back into your system as...
OK, broad subject, but here goes...
Let's start with a simple mixer. If you apply a low frequency input to the IF you can at best get AM modulation of the carrier. The output spectrum is symmetrical, and you'll also likely get some LO leakage (aka carrier feedthrough, aka carrier leakage, aka...
Other thoughts to add:
1. Output match to get maximum power is not going to be where you get a good match. You probably know this, but it wasn't clear in your question. I just want to make sure that you understand the difference.
2. Quarter wave sections will be big, but give good...
What do you want to know? I've done work on instrumentation grade IQ modulators a couple jobs ago, though a few decades higher in frequency than you are looking for.
Diplex can be accomplished in this sort of situation by using a T to two separate filters located half wave away.
For example, start by designing two filters at 2.2 and 2.3 GHz that are ~30-40 MHz wide. Use a microstrip T with half wave at 2.3 GHz to the 2.2 GHz filter, and visa versa. For...
Re: SOS!
Couple tips from my meager work on printed waveguide:
1. Microstrip -> Dielectric Loaded WG (SIW is a BS name for a prehistoric concept) tends to be pretty inductive, I've yet to stumble across a decent model for this transition.
2. If using HFSS to model your transition and/or...
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