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Hi everybody,
I am designing a SIW which propagates TE10 at 10GHz and TE20 at 14GHz in CST.
The cut-off frequency for TE20 is already 12GHz in my SIW, which is feed by a microstrip tappered transition.
I though that one excitations would be enough and TE20 would be transmitted inmediatly, but...
To feed properly a slot, the outer face must be weld to one side of the slot and the inner face to the another side. My question is: If in the side where outer face is weld, the inner is touching that surface too, what happens? In the another side of slot just inner face is weld of course.
Hi everyone,
I designed a slot in a cylindrical wall in HFSS and manufactured it. To be in the desired frequency, the feeding point was not exactly the same as HFSS computed, but it does not matter. I have to feed the slot, theorically I have to weld the coaxial inner face to on side of slot...
Thanks, so a bigger antenna can be self-resonant. Anyway, if I place a variable inductance before the RF feeding, tunning the antenna should be easy, doesn't?
Is there anyway to make a normal-mode helix to be resonant? I mean, modifiying its diameter or length can be macthed to 50 Ohms without matching networks?
A mistake, I wanted to say 2:1.
There is no tracks on PCB, it is just a piece of methacrylate with a hole for the helix, and the helix is weld to an SMA and the SMA connected directly to VNA. No matching networks, only dielectric placed parallel close to antenna.
Hi,
I have acquired a small helix antenna for 433Mhz. According to its datasheet, it is matched to 50Ohms with a very good VSWR 1:2. Of course, it has been tested on a PCB with an specific groundplane and matching networks to achieve this VSWR, but there was not information about that.
I have...
Good evening.
I am simulating a MIMO channel, but I have a doubt about adding noise. I am measuring the BER vs EbNo, but Matlab function AWGN requests SNR. I already know that SNR = EbNo + 10log(spectral efficiency), but I don't know what spectral efficiency is while transmiting 4x4 mode with...
If I renormalize to this impedance instead of seting it as lumped port impedance it doesn't converge... Perhaps HFSS cannot simulate in the right way this complex port impedances. I gonna try a serie RLC in the small loop to remove the reactance, can I use a RLC 3d boundary? Any suggestion to...
Another question... If I just wanna know the coupled power through S21 params, and i do not care the radiation pattern, can I set a small air box to make simulation faster?
Thank you.
I didn't check port renormalization. Furthermore, when I simulate that with a 50ohms port the simulation is fast and returns reliable results, but with the new impedance it is longer and strange S larger than 0dB. The port impedance is 5+j1000 Ohms to match the short dipole, 3m long at 10MHz. I...
Good evening.
I am simulating in HFSS a short dipole, as well as a small loop antenna. The purpose is calculating the coupling between two short dipoles or two short loops. To match these antennas I use as excitation a lumped port with the same resistance and opposite reactance than the...
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