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  1. buding

    industrial length for the microstrip transmission line

    Well, the only advantages of FR-4 is that it is cheap and it is good enpugh for RF circuits. Disadvantages are changing RF properties depending on vendor. Problem is that every vendor prepare the whole material itself. Compared with for example ROGERS materials, which are very stable despite...
  2. buding

    industrial length for the microstrip transmission line

    It is OK to manufacutre such a width. The only think you have to consider before you will order your PCB is what type of software did you use for optimization. If it wasn't any real 3D or at least 2.5D simulator so You have to expect that measured results compared with simulations will be more...
  3. buding

    dielectric antenna

    The efficiency of your antenna will be very dependant on dielectric material. As You probably know most of dielectric materials are much more lossy then air. Also they are trying to keep electric field inside. So, if You want minimize the size of antenna with dielectric load, be carefull. You...
  4. buding

    Day/evening coverage

    Hi! I would like to add one more point of view. Antenna used i such a device is always pointed, in some way, towards the ground. And, as everybody knows, it gathers the thermal noise from the ground. During the night situation is much better. To avoid such a problems You have to make good...
  5. buding

    How to increase bandwidth in dual-band antenna??

    What kind of feed system do You use? Maybe it is possible to improve bandwidth by making better feed circuit.
  6. buding

    Sonnet Suite EM simulation software: EMC and Antennas...

    Hi! I used SONNET software for microstrip antennas. Results were very good. I designed 2x2 patch array for 12 GHz feeded by coupling thru aperture. Whole design was very complicated and I was very suprised when my measurements were almost the same with simulation. I reccomend this software...
  7. buding

    How to measure antenna bandwidth???Pls Help??

    As I know it is enough if You know VSWR. Bandwidth of the antenna will be the bandwith were VSWR is < 2. Buding
  8. buding

    Thin substrates

    Hi! Just check with different producers (ROGERS, ARLON, MATSUSHITA etc). They have core materials with thickness even 0.1 mm. They use also prepreg materials with thickness about 0.05 mm. Contact them. Good luck. Buding.
  9. buding

    Electrical

    Hi! You can find a lot of basic theory in very good form on: http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html Good luck! Buding.
  10. buding

    Effective permittivity

    Your resonance frequency is changing because closing Your hand to the antenna, You are changing the load impedance. In perfect conditions You should supply open space without any reflections to measure right resonance frequency. The same is with putting some dielectric on Your antenna. I don't...
  11. buding

    Setup for radiation pattern measurement

    1. The best case would be if You had anechoic chamber to isolate all noise from outside. Otherwise I wouldn't count on good results. Especially on frequencies like 2.4 GHz. Reference antenna is a good idea to calibrate all measurement equipements. Normally horn antennas are used as source...

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