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  1. K

    network anayzer calibration set

    Hello, I would like to create a calibration set (open, short, load, through) using a network analyzer and an existing calibration set. The idea is to calibrate the VNA with the existing calibration set. Then, measure my "home made" calibration set with the VNA. The measured data should be...
  2. K

    dipole antenna: induced EMF method

    printed induced emf method Hello, The induced EMF method is being treated in Antenna theory written by Balanis and applied to dipoles and mutual coupling between dipoles. Does anyone know if and how this method can be applied to a plate dipole? Does anyone have a good reference? Thank you...
  3. K

    CAD of microstrip antennas software problem

    Hello, Regarding: CAD of microstrip antennas for wireless applications, Robert A Sainati, Artech House. The book is not for sale anymore at Artech House The programs are compiled in some basic version 16 bit and do not run on a 64 bit computer. Does anyone Know how to run them on a 64 bit...
  4. K

    diffraction specular vs. diffuse

    Hello, Is there a distinction between specular and diffuse diffraction as is the case for reflections? How is it quantified mathematically? Thanks. Best regards.
  5. K

    multipath reflection fresnel zone

    Hello, In https://adt.library.qut.edu.au/adt-qut/uploads/approved/adt-QUT20020326.160949/public/02whole.pdf at pp.49-53 the author talks about fresnel zones. Especially the fresnel zone due to reflections interest me. The author gives 2 equations 2.24 and 2.25 which are a bit foggy to me...
  6. K

    measuring circular polarized antenna problem

    understanding and measuring circular polarization Hello, I have a few doubts about measuring circular polarized antennas. One method is measuring the antenna under test (AUT) with a linear polarized reference antenna (RA) in 2 orthogonal planes. That is the RA is rotated 90° and the AUT's...
  7. K

    Component reference plane in microwave office

    Hello, When using lumped elements in a microstrip circuit simulation in microwave office, what is the reference plane of the connection? Is it the end of the component or does it have to do anything with the component footprint? Best regards.
  8. K

    Looking for 3 way splitter sequential 120°

    Hello, I am looking for a broadband (30%) 3-way splitter design with 120° sequential phase output (0°/120°/240°) in equal power. Preferably a microstrip implementation with or without lumped elements or any other off the shelve components. Thank you very much. Best regards.
  9. K

    How to run CST in batch mode?

    Re: cst in batch mode hello, why don't you use the "job control" provided with your cst installation? this works fine for me and it's a lot easier than batch mode. best regards
  10. K

    phd or job after masters engineering

    hello, you can work towards the phd degree while working in the industry. it only takes a university promoter, and something to kill the pain :D of working long hours :cry:. beer works just fine. greetz
  11. K

    electrical properties of several materials at L-band

    Hello, I am in search for the electrical properties (permittivity and permeability) at L-band of several materials such as, but not limited to: -various soil constitutions and humidity -construction materials (glass, concrete, reinforced concrete...) -natural obstacles such as trees Does...
  12. K

    basics about microstrip antennas

    This article " The basics of patch antennas" on rfglobalnet outlines the basics. It should get you started. http://www.rfglobalnet.com/content/news/article.asp?docid={75e3bff5-2b87-479f-8d32-964f1fd04715} Best regards
  13. K

    [CST MWS] ""farfield is inaccurate!!" means .

    Re: [CST MWS] ""farfield is inaccurate!!" mea that's because the simulation boundary is to close to the dipole with respect to the wavelength. it is better to use the open + add space boundary when simulating antennas in free space. cst will set a proper simulation boundary for you best regards
  14. K

    Final Year Project: Dual-Frequency Microstrip Patch Antenna

    Re: Final Year Project: Dual-Frequency Microstrip Patch Ante any decent book about microstrip antennas should give a few examples more specific books are: broadband microstrip antennas, Girish Kumar et al., artech house Compact and Broadband Microstrip Antennas, Kin-lu Wong, Wiley best regards
  15. K

    Final Year Project: Dual-Frequency Microstrip Patch Antenna

    Re: Final Year Project: Dual-Frequency Microstrip Patch Ante hello it's a lot easier to design small band antennas than broadband antennas. 200 MHz at 10 GHz would be 2 % bandwidth, that's small band. dual band structures are usually built by exciting 2 modes. the natural modes are usually at...
  16. K

    Final Year Project: Dual-Frequency Microstrip Patch Antenna

    Re: Final Year Project: Dual-Frequency Microstrip Patch Ante hello using fr4 at these frequencies is not a good idea, the substrate is way too lossy. the result will be an antenna with very low efficiency, the bandwidth will increase though :D . It is better to use ro4003 or another microwave...
  17. K

    I need Matlab codes for Antenna design

    antenna design in matlab hello I am not sure it's the same material covered in the book. it seems they're working on a new related em analysis with matlab project, see: https://ece.wpi.edu/mom/ best regards
  18. K

    green's function question

    hello, the green's function in free space is very well known (exp(j*k*R)/(4*pi*R)). however, for very small distances (R) the result becomes infinite. how can these problems be solved? is there a specific green's function for small distances (e.g. 1e-6*lambda)? best regards.
  19. K

    antenna phase center question

    hello, for calculation of the phase center of an antenna an elevation range is specified. what is the most common range for commercial gps antennas? is a different range used for chip based antennas, rover antennas, geodetic antennas (choke ring)? can anyone give some real life examples...
  20. K

    CST EM Studio: Symmetrical geometry but asymmetrical results

    Re: CST EM Studio: Symmetrical geometry but asymmetrical res hello, I have had similar problems in cst mws. the results became better (=more symmetrical) when a denser mesh was used. best regards

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