yes
it is my second question
when diode is on all of my power should pass from diode and nothing from antenna should be propagated port 2 is GND and all of my power go to ground
when diode is off i work in high power (200W) and when it is on i work in small signal (1mw)
It should be SPDT but I cant find any diode with this Spec so I looking for new idea
When I work in large signal all of my signal from port 1 should go to port 3 (300w 9G)
But when I work in small signal (1 mw) all of my signal should go from port 1 to 2(short circuit)
I cant find any diode from MACOM or Skyworks or Microsemi that they can work in that area
What do you mean with "short circuit"? A short (reflection factor = -1) would reflect the wave back to the input. An absorber port should have 50 ohm impedance.
Hello
I like to build a mismatching in some times for output a circuit (to Antenna)
It works in two area
First it should be match with antenna in 300W in 9GHz (diode off)
Then it should be mismatch in 1mW in 9GHz (diode on)
I build a circuit with a diode in SPST structure (undoubtedly I should have SPDT and it will work better than SPST but I can’t find any diode for put in power line so I have to use SPST)
1- After input I put a line with lambda/2 length
2- I put diode circuit here
3- Here I put radial stubs lambda/4 lines and etc.
4- I put instead diode a Resistor that I change the amount in forward bias in 1 ohm and in reverse bias in 100000ohms it goes to ground
5- I put in other way Antenna
6- It works not correct
What is(are) my mistake(S) here?
result aren't good
thank you
but i cannot understand why i add electrical length with factor of lambda/2 some notch appear for example (900 and 540) near 8.1GHz but when i change to 180 they disappear
how can i calculate them?
Now your TL2/MRSTRUB is an open circuit (hopefully) and you line can "see" the 540° long TL6 plus 900° (ninehundred degree) long line TL7, which transforms the 1mOhm at port 3 around the Smith chart. Strange design.
BTW, using that port impedance at port 3 makes no sende to me. It is difficult to realize that short in hardware, and mixed impedances in S-parameters are difficult to interpret.
As you know I like to build mismatch circuit in some conditions
I put instead of diode a resistor (R1)
In 54.7dBm 9.2 GHz all of my power should receive to antenna Port1 to Port2 and diode is off
i couldn’t find diode with good Rs
( in https://www.richardsonrfpd.com/Products/Search?endCategory=RF PIN Diode#) and a lot of my power will be dissipated for ex MA4P404
How can I improve it? (I don’t like put some diodes in series it will be expensive an may be sth unexpected happen)