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From experience:
ok near transmitting antenna or LO output
not ok near receiving antenna or mixer input/output traces - everything is amplified by mixer's opamp
Important additional example: Upper edge of patch element is an open end. Reflection coefficient point is on the right side of Smith Chart (on the horizontal axis). This point travels one full circle as we move from top edge to the lower edge of patch antenna. Thus, according to transmission...
Check this article: https://www.analog.com/en/resources/technical-articles/converting-sparameters-from-50937-to-75937-impedance.html
My understanding is that measurement devices like VNA are dealing with signal voltage and phase. Firmware contains constants for input/output impedance (Zport=50...
In many sources, e.g.,
https://www.semanticscholar.org/paper/SIMPLE-MODEL-FOR-THE-INPUT-IMPEDANCE-OF-RECTANGULAR-Yildiz-Guney/56f1811ca913e7d480538acda1d7200fac090291
https://www.gunthard-kraus.de/Tutorial_Sonnet/pdf_English/Tutorial_Sonnet_e.pdf
patch input impedance point is placed on a real...
Question is not clear to me. Maybe you referring to beam steering? E.g., it is cheaper to make passive beam steering based on signal processing os waveforms from receiving antennas. Active beam steering is more robust, and only area of interest is illuminated by microwaves and there is no power...
Is there a resistor? I see a small rectangle near radial stub, not sure if it's defined as lumped element. If it's not there, then add a resistor.
Also, you need to reduce radial stub radius to something around 0.9-1.1mm You can find best radius from simulation, or use some analytical formula...
You can use radial stub or quarterwave stub.
Yes, there will be short on a Smith chart, and when you add 50 Ohm resistor in series it becomes a pretty good 50 Ohm termination.
1. For quarterwave stub it will behave like a 50 Ohm termination in narrow band.
2. For radial stub, it will behave like...
Maybe better term is microwave short. We replace via to ground with a radial stub.
Ground via works both at DC and Microwave
Radial stub works only in some range of microwave frequencies, but have advantage of eliminating via inductance. Also you can bias radial stub to a voltage different than...
I think that you can terminate this port with a classical resistor+radial stub combination. Resistor is 0402 size, and radial stub is designed to make virtual ground (radius is less than quarterwave). It worked up to 26GHz in my case, and yours is only 4Ghz higher. I haven't used any special...
I thought the same at first, but then I've realized that OP is more advanced and probably understands that. Most likely it is about... pass band ripple of this divider? Maybe there is a better term for microwaves.
Looks ok to me.. But if its unacceptable for your application, I have few ideas:
1) Single divider still has mismatch. Have you tried to simulate single divider? If there is some small mismatch, it will work as 4 impedance transformers (e.g., path from port 1 to port 2). Try to simulate single...
You can try another type of antenna. I have used FR4 at 20GHz+ for EBG antenna and AFSIW antenna (google on EBG mushroom structure using VIAs and Air Filled Substrate Integrated Waveguides). With AFSIW trick is that you don't use dielectric. To eliminate electrical contact problem for AFSIW...
I think that many esp8266 Arduino boards use different pins for UART (not 25 and 26).
E.g., if you download latest firmware from espressif's github, it will not work on tiny esp8266 module unless you change uart to work with pins 25/26...
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