Welcome to WIFI Antennas

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.

clanon

Members
  • Content count

    670
  • Joined

  • Last visited

Community Reputation

211 Excellent

1 Follower

About clanon

  • Rank
    Advanced Member

Recent Profile Visitors

2621 profile views
  1. 4:1 balun (50 ohms to 200 ohms , 75 ohm to 300 ohms , etc)
  2. Correct adaptation from 50 ohms to 300 ohms antenna (Quarter wave long should take velocity factor of Coax in length ) 0.66 PET , etc
  3. a Ratio between antenna Impedance and radio impedance the bigger the difference bigger the losses...let's sat 300 ohm antena/ 75 ohm radio 4:1 VSWR = close to 40% reflected power on TX...on RX it's gonna be WORSE...(small signal)
  4. 0.2 0.3 BRASS paper...? and a sharp cutter...several tries (using a printed PAPER taped on top) cut through the printed lines...? solder the vertical strips... PS: 0.2 is pretty RIGID...
  5. Yagi

    Yagis hit a WALL at 15 dbi most of the times (with 15 elements and a BIG reflector)...you need 2 for 18 dbi , 4 for 21 , etc
  6. nope...BUT those complex feed networks steal gain (several db)
  7. double post
  8. Water absorption should be adressed in PES foam...Changes ALL. PVC pipe has THIS weirdness...
  9. LOOP should be CLOSED at feeding Points... then , EACH Loop should be feed with 90 degrees phase difference
  10. Double lineal here , NOT circular "The polarization of the emitted signal depends on the spatial location of the antenna. Horizontal - horizontal, vertical - vertical polarization. [4] The horizontal position represents when both squares are next to each other, the vertical position is when both squares are placed one above the other." DoubleBiquadOmni-Antennafor2.4GHzWirelessLinkApplication.pdf
  11. YES you treat it like a simple dipole (but polarization is 180 degrees inverted for a double quad) Then to get Circular Polarization , you need to retard 90 degrees the wave at each quarter making a 0 90 180 270 rotation (for this the easiest approach is a Quarter wave length (dielectric in coax included) from One biquad to the other...
  12. it should be possible with a 90 degrees (velocity factor of coax x 1/4 wavelength) between both antennas (but interactions should be simulated)...
  13. one of the LOWEST in the world 0.0003 at 3000 mhz , only one better Polypropylene...at higher frequencies...5.8 ghz ideal...