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clanon

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Posts posted by clanon

  11. Posted · Edited by clanon

    Adding parasitic patches (close by) would make a new s11 dip (higher or lower than the original) if those TWO dips are close by you'll widen the bandwidth ...(at some s11 expense , s11 goes up , less energy absorbed ) if you stay under -10 and efficiency is good...you are good to go...PS: efficiency is ALWAYS GOOD for me , cause i use STYROFOAM as dielectric...

    1 person likes this

  13. Posted · Edited by clanon

    3.5 ghz (from 3.4 to 3.6 ghz bandwidth) mimo (more than 20db isolation between ports) at least 12-15 dbi gain...imho (gonna have to put the modem with the antenna close by...short cables...) Opening and soldering NEW cables (low losses) would be better...

    images.jpg

  14. Posted

    On 8/6/2024 at 7:37 AM, zetka said:

    Has anybody tried to measure the real made antenna samples upon those design on some VNA (NanoVNA) and compare the simulations to the real results?

    on this ALL METAL structures (if no mistakes have been made) results should be close to simulations(5% 7%) BUT if DIELECTRICS have been used...THINGS GO HAYWIRE FAST and BAD...in MY experience (change in dielectric constant from 1.1 to 1.075 HUGE dimensions and results difference at 2.4 ghz and PATCH ARRAY)

  18. Posted

    On 6/8/2020 at 11:55 AM, marsbar said:

    If you look at amplifiers, these are placed inside a milled solid aluminium block, there must be a reason for that.

    That's the COMPLICATED EXPENSIVE approach...BUT it achieves MODULAR SHIELDING of different sections (LNA , RECEIVERS , Local OSCILLATORS , Power supplies , Filters , Switches  etc)

    1 person likes this

  21. Posted · Edited by clanon

    4 hours ago, eco32 said:

    Thats stubm balun, it may be directed downward or upward, I have no idea what the difference in operation is. Only klow that is to phase shift. (My version in previous page was tunable)

    Base[1].jpg

    Open side pointing up (the direction of the Energy you DON'T want coming through the Shield of Coaxial) imho The confussion comes from the rubber duckie pointing DOWN (open end) cause it is ACTING as a Quarter wave and ground plane to obtain a HALF WAVE dipole...