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    Dual band antenna matching

    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...
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    Why is there a need for isolation in mixer design?

    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.
  3. 88888888

    Farfield Radius of a Lens Antenna

    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.
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    Field strength (Power)

    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...
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    Fresnel coefficients

    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...
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    Absorption loss

    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)
  7. 88888888

    1port calibration - TRL?

    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?

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