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Hi, can anyone please help me with this question? Thanks in advance. For a dual band antenna, why does a shunt inductor or serial capacitor shift impedance more in a lower band than in a higher band? Why does a serial inductor or shunt capacitor shift impedance more in a higher band than in a...

Hi, can anyone please explain to me why is there a need to have IF/RF or IF/LO isolation in mixer designs? Also, is 20dB isolation a standard limit? Many thanks.

Hi, I need to find the farfield radius of a lens antenna. Can someone please tell me what is the maximum dimension of a lens antenna? Do I need to take into account the lens maximum dimension or just the planar antenna maximum dimension. Please help. Thank you.

For plane wave excitation in FDTD simulation, Can the field strength (E) be large say 10000V/m or more when the cell size is small? E.g.: With an area of 10^-5m^2, the power would be P=1/(2x377)x(10000)^2x(10^-5)=13.2W. This value is too large to be practically true. Maybe the way of the...

For a wave travelling from a denser medium (e1=11.7) into air (e2=1), the reflection (R) and transmission (T) coefficients seems to be a positive value for R and thus T is bigger than 1 for both parallel and perpendicular polarization. How can this be? Do I need to change the formulas...

How to calculate the absorption loss for an extended-hemispherical Si lens? (permitivity=11.7,resistivity=2000 ohm-cm,lens diameter=12.7mm, lens volume=828x10^-9(m^3),f=90GHz)

I have TRL standards (2-port calibration) on my wafer but my DUT is a 1-port device. How do I overcome the calibration problem?