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Recent content by DenVo

  1. DenVo

    Optimizing Cx Polarization Pattern for Patch Antennas

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  2. DenVo

    Optimizing Cx Polarization Pattern for Patch Antennas

    Hi Higgler, how would you feed the patch with 4 feeds for one polarization? At present I use 2 feeds (180° out of phase)for the V-polarization, like that: ________________ - 0 - - - - - - - - - _______0_________ 0= Feeds...
  3. DenVo

    Optimizing Cx Polarization Pattern for Patch Antennas

    Dear All, does anybody know ways to increase the cross polarization supression of a single microstrip patch antenna? The following technics are known: 1. Feeding the patch with two feeds. One feed has 180° phaseshift. 2. Bending the corner of the patch. Regards DenVo
  4. DenVo

    Limited field of View Array

    All of you know, that the scan angle of the phased array antenna is depending on the element pattern of a single element. By building a subarray we would get a new element pattern, with a main lobe and sidelobes.As a general rule , the beamwidth is very narrow. But if I design now a subarray...
  5. DenVo

    Temperature Stabilization of Up-converter

    Dear Everybody, does anyone know how to stablize a 7 GHz up-converter output signal? The up-conversion works in two steps. 180MHz is first IF and 570 MHz is the second IF. Now we noticed a level imbalance of around +- 1.5 dB on a temperature range of +-30K. Design is in MMIC. The goal is...
  6. DenVo

    Limited field of View Array

    Hey everybody, has somebody of you experience in building LFOV (Limited Field of View) arrays? My design has a 4x8 patch matrix with lambda/2 spacing. The patch element has a 3dB beamwidth of around 105°. Which field of view you would expect by assuming a very clever amplitude and phase...
  7. DenVo

    Truncated corner patch antenna

    the following sentence is not true: if circular polarization is desired by using a truncated patch, please also take care of the field vector strength from h and v. If both are not exactly the same you will generate elliptical polarisation. so its right: if circular polarization is desired by...
  8. DenVo

    Truncated corner patch antenna

    within a truncated patch the horizontal and vertical edge will be excited. The horizonal electromagnetic field vector and the vertical em- field vector are 90° out of phase, which produce the circular polarization. by the way the 90° phase shift between h- and v- vector or vice versa defines...
  9. DenVo

    Patch Antenna Design and it's challanges (low cx-pol, robust design)

    Hey Higgler, nice that you are open for discussion. Indeed I simulate/optimize the design by using CST. The single patch is part of an array with arround 32 patches in one subarray. What should I do with the backwards energy? I optimized the design for low back radiation and good cx-pol...
  10. DenVo

    Patch Antenna Design and it's challanges (low cx-pol, robust design)

    Hey Higgler, thank you for your response. I try to give you a better picture of the design. This X-Band antenna is a multilayer structure with around 4 substrates. On the separate substrates are the radiating patches which are pin coupled for V-Polarisation and EM- coupled for the...
  11. DenVo

    Patch Antenna Design and it's challanges (low cx-pol, robust design)

    Dear Experts, I am designing a patch antenna in X-Band. This patch is a multilayer aperture coupled (H-polarization) and pin coupled (V-polarization) patch antenna which uses distances between the patches and the reflector plane. The patch is designed for good cx-pol suppression in both...
  12. DenVo

    Electromagnetic field Sensors

    Dear funnygril, the microwave oven is usually working in cw (continious wave) mode using an rotating dipol antenna at the top. Frequency is S-Band (~2.3GHz). You could implement a small receiving antenna probe on the side wall to measure the energy. The antenna structure should be robust...
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