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Hi All,
in FCC regulations the Poawer spectral density is defined in dBm/MHz. how could i transform this in UWB/GHz?
is this true:
0dbm/MHz = 1mW/MHz=(1mw*10^3)/GHz =(0+30)dBm/GHz=30dBm/GHz?
Thank you
Hi aLL
i want to simulte S11 of an antenna in diffrent product (DUT) with CST microwave. is it possible to make a sweep of well dfined prodct to become the S11's?
Thnk you
Thank you for ur answer!
When you want to design for exemple a horn antenna, which will be used in free space, the matching (S11) should be good in free space for the wanted frequency band. My goal is to design an antenna which should show a good matching in water. So it do es not matter how...
Hi All,
I am designing an antenna, wich will be used in water. I tried to optimze the matching of the antennas(transmitter and receiver antennas), but with no success (S11=-3db) . I am just interested in S21. S21 is good enough for me to do the measurement.
Is it bad to devolop this antenna...
Hi all ,
I want to design a microstrip antenna for an application where the temperature changes between 10°C and 70°C. I assume that the Temperature has an effect on the matching (SWR) of the antenna , and on the dielectric constant of the substrate. is it advisable to use microstrip in this...
thanks for ur reply. I wonder why in the literature the most discussed topic for calculating the amp and phase from an IF signal is the calculation of I and Q. Do u know any literature discussing this topic with DFT for heterodyne (or homodyne) receiver?
thank u
Hello all,
when i have an IFsignal, i know the method to calculate the Amplitude and the phase. First the I and Q componenent should be calculated,this is achieved with downconverting the IF signal digitaly DDC.
Amplitude=sqrt(I^2+Q^2). phase=atan2(Q/I).
my quuestion is: is it possible to...
Hi All,
I designed a microstrip Antenna in Cst. I want to print it now for further Developemnt(etching....). How should i Print it ideally?
should i print it, like printing a document?
Thank you
Hi,
it is great to have all this answers.
I need the antenna for a transmission application. i will need two of such antennas connected to VNA. from the S-parameters i want to calculate the permittivity of some materials. the goal is a linear polarized antenna with a matching of (<-10 dB)...
hi all,
did someone know if it is possible to buy a wideband horn antenna (~ 200 MHz to 9 GHz) with Linear Polarization?
what is better: to use a very wideband antenna or to use diffrent antenna for diffrant frequency ranges. For exemple: to use three antenna (200MHz to 2 GHz, 2GHz to 5GHz...
Hi all,
i want to send power with two antennas (same frequencies) in two diffrent locations. i have also two antenna as receiver. i want to work with the vector networ analyzer. i s there any rf switcher to buy, to be able to feed both sender successively, and also to receive successively. the...
a power of 0dbm is fed to a coaxial cable . this coaxial cable is connected to an antenna. so the power will be sent through the antenna. i know that in RF we could not speak about the voltage. But could someone tell me what is the Voltage and current in the coaxial cable?
Hi all
i am designing antenna imerged in water. The fequency is 2.5 GHz. the size of the water-Box is 120*120*160 mm3. Which mesh should be assigned to the water box?
thank you for help
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