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  1. FriendlyBen

    Small PCB antenna

    Cgorney, I don't know about your experience in RF but there is many ways to trace an antenna on a PCB, all depend on you space constraint, desired gain, range, etc. If you don't have RF equipment like a network analyzer you should consider buying a SMD antenna like www.linxtechnologies.com...
  2. FriendlyBen

    Small PCB antenna

    This is a paper that help me understand F antenna http://www.loe.ee.upatras.gr/EM/Journals/Analysis%20and%20Design%20of%20an%20Inverted%20F%20Antenna%20Printed%20on%20a%20PCMCIA%20Card%20for%20the%202.4%20GHz%20ISM%20band.pdf Hope this may help ! Thanks ! FriendlyBen [elf]
  3. FriendlyBen

    Small PCB antenna

    VE1BLL, I agree with you ! Actually for me I have a fair good radiation pattern and I already reach my electric 1/4 Lambda lenght by layout strategy (Printed inverted F folded monopole). I think that the corporate already found that using the same pcb for both 433MHz and 868MHz for printed...
  4. FriendlyBen

    Small PCB antenna

    Hi FrankTCS, At 433MHz I got a working design, meaning in production. At 868MHz the solder mask make me face a big self oscillation problem. The answer to your question is subject to interpretation: "Did I get a good gain" for a personnal point of view I would say, not enough now ! But for the...
  5. FriendlyBen

    C- band interference

    Hi saintjohn, the apostle :-)))? At the place I worked before, one of our customer, a local TV station was facing a kind of interference at 4 GHz, The downlink feed from the mother station was freezing from time to time. We finally found out that the parking lot light was defect and located...
  6. FriendlyBen

    Small PCB antenna

    HI RFtweaker, I am an RF technician, the way I use to do it is trial and error. I moved my ground and feed point until i get 50 ohms on the network analyser. Also I cut the length of the antenna until I get the max power out. It's an almost blind process and time consumming also. Right now I try...
  7. FriendlyBen

    Small PCB antenna

    Just try the 868 MHz, already 17 dB higher just by tuning and with the same PCB layout ! More than expected ! So great ! Thanks ! FriendlyBen [elf]
  8. FriendlyBen

    Small PCB antenna

    Hi everyone Right now I got 7 dB improve with a PIFA/meanderline like antenna at 433 MHz. DOUBLE THE RANGE ! great ! let's try 868 MHz for the next weeks...to be continue... Thank's to everybody ideas! Thanks ! FriendlyBen [elf]
  9. FriendlyBen

    Small PCB antenna

    Lot of material to chew on, great ! Thanks ! FriendlyBen [elf]
  10. FriendlyBen

    Small PCB antenna

    Hi Comcokid, I am doing both frequencies on the same antenna (I must use the same pcb layout), both have a matching circuit and both shown about the same attenuation. Thank you to remember me Linx tech. I already try somes samples, it's very good for the size. They play with the feed point...
  11. FriendlyBen

    Small PCB antenna

    Hi everybody, I want to radiate out of a 1" X 1½" board at 434 and 868 MHz ISM band. I am now 27 dB lower with that small loop around the board pcb antenna in both frequencies than a bigger board which have an helical wire antenna. Both project have the same short range transmitter...

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