Recent content by yefj

Hello , I have resimulated the structure in another way and got a result much better to realistic DC value s-parameters . I made again IFFT to the S2p file and got the attached plots. given my situation few questions: 1.given my 40GHz BW what kind of sizes I can use TDR TRT effectively 2.given...

Hello ,I have simulated a basic VIA (shown in the photo) in CST EM simulator from 0 to 40GHz and extracted its attached S2P. using the code below I resampled it and made IFFT with multiplied the normalised hamming window. I got the following plots in MATLAB. Is there a way to interpret the VIA...

Hello , I am having trouble to visualise your words.so basickally you say to replace the connector instead of adding an absorber ,Could you please reccomend me a connector to use. What kind of excitation connector has isolating third layer? in the photo below I have regular SMA which has two...

" I am not seeing any "chassis ground" connections on the back of most signal generators" I connected the box to the outer coating of the coax cables as shown below. Also I put an absorber that made the situation much better. However as you could see my mode is only -10dB. what do you...

Hello , I have built a resonator as described in the photos and the link in the video below. Basickly each coax cable excites a mode in the dielectric saphire cube shown below. However I need to confine the whole system in a metal box where both exitation connector so outer coax coating...

Hello,I am looking for articles about dielectric resonators where we excite separtly orthogonal modes. each excutation responsible to excite a mode. maybe its like shown below. if you understand my idea could you mentiongood articles about that?

Hello,I have built an anapole resonator described below. It work almost great but I get a very hard decline in magnetic field from the surface to the height of 0.1mm. from 2000A/m to 300A/m in just 0.1mm height increase. is there a way to increase the magnetic field? Video is attached in the...

Hello tech99,I made a video for you explaining the situation. I just can find a good way to increase frequency all methods are barely increasing the frequency . Thanks. 2025-08-27 08-15-49.mkv

Hello , I have designed an anapole resonator which works great at 10GHZ,With the mode shown below. However when I try to increase the frequency of this mode by decreasing the inner circle it didnt went so well. Video is attached ,could you please help me understand how to increase the frequency...

Hello, I am building an anapole resonator as shown below.for wide 50uX25u bridge we have a current going into two separated streams on the sides of the bridge. but as the bridge gets thinner the current is much more homogeneos(and so is the magnetic field) over this bridge as shown below How...

Hello, could you please draw in general, its hard to imagine your the exact location of the screw? Thanks. "1. Metallic Tuning Screw Place a brass or copper screw near (but not touching) the sapphire. Adjust its distance to perturb the evanescent field, shifting frequency (~100–500 MHz/mm)."

Hello, I have a wispering gallery mode at 10.24GHz, the resonator is a saphire cilinder which sits on a teflon. I want to shift that mode to 14.5Ghz after that I need to do some tuning of the mode frequency. I cannot change the saphire outer diameter as a way to do fine tuning for the modes...

Hello,Could you please draw what you mean in general? How down it helpes with achieving good coupling?

Hello,I have built a resonator which needs to produce whispering gallery mode and coupled threw coaxial cables . I got a mode at 9.87z and at 11.29Ghz. But its coupling is very low . How can I increase the coupling to this mode? Thanks. 2025-05-21 12-38-37.mkv

Hello,I want to created th following system.From the articles I see that we input noise to the amplifier then the noise gets amplified and we compare thefeedback from the output(s11) to the noise. few questions: 1. where is the comparation of the feedback in the topology below. I cant see here...