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Sorry for replying so late.
I am working again on this problem so thought update you.
Problem is my client has an existing cavity which as WR340 opening to mount WR340 waveguides, now they want to excite this cavity with 433MHz using antenna that should be fed into these holes which have...
Thank you so much for your reply.
I am not exciting cavity by using WR340 waveguide at 433MHz but feeding an antenna through that port that should be compatible with 433MHz. But need to help to design such an antenna.
regards,
Hi all
I need to excite an existing cavity with a monopole antenna at 433MHz, feed point will be Din 7/16 coaxial connector but I am completely new to this technology so need some help. I am using COMSOL for simulations. Cavity dimensions cover the free space wavelength of the 433MHz, just for...
Dear all,
I am assigned a task to develop a PDK for GaN process and really do'nt know wherer to start, since my background is from amplifier design not device technology design. I will greatly appreciate if any you fellow comrade can help me to start this process.
Any help is apprecaited?
Thanks for your reply, I understand the concept of crossover frequency but I am lost after that.. if the bandwidth is wide does it mean it will respond slowly and if bandwidth is narrow then it will repond quickly, am I correct by saying that?
Dear all,
I am trying to understand envelop tracking system and not grasping the concept of power supply bandwidth. my power amplifier will be working between 8GHz and 10GHz but instantanious channel bandwitdh is 100MHz. so how does my oprating bandwidth relate to power supply bandwidth, since...
Thank you all, I think I will go with a higher power device and as SLK001 said try with in steps. I have designed the PA from 20 to 1000MHz before but protection was not a concern but for this new product it is.
Hi all,
I have read few threads here on the subject but still didn't get the answer that i needed, so starting my own.
Please check out my thinking process and then answer or suggest the solution.
I am designing 20-1000MHz 30W SSPA which should be able to withstand open/short conditions on...
Ok, one thing is clear that what i was thinking is correct, and proven by realised hardware as well.
second question: now that i have made the board and based on just the non-EM simulated circuit and finding that FET gets blown out straight away i.e. its GaN FET @ 28V. when i am biasing is i am...
Hi all,
I have designed an amplifier and stabilised the FET unconditionally and checked the K factor across wide band using AWR microwave office and PA was stable across the band. However, when I extracted the EM structures of the matching networks and checked the K factor again, I found out...
I agree with Biff44, you transistor is getting into oscillation and blowing itself off. did you consider unconditional stability at the start of the design across a wide bandwidth?
Hi, Sorry for too late reply but not been on forum for some time. However, answer to your question is that if your design is micro-strip based, which it seems like it is then top ground plane is there just to confine the emitted EM and you keep the top ground plane at least 2 times the trace...
Real loss means resistive loss that are not frequency dependent as long as you can compensate for the parasitics of the resistor, there is plenty of material available on this subject. try reading about stabilizing RF FETs by using resistive networks etc.
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