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.


  • Content count

  • Joined

  • Last visited

Community Reputation

42 Excellent

1 Follower

About swarg_eu

  • Rank
    Advanced Member

Recent Profile Visitors

681 profile views
  1. There are 2:1 4:1 combiner, filer, LNA separately and the 4:1 filer and LNA on single board
  2. Your cable (connectors) seems to be badly assembled (happens to the best, there is usually a QC to avoid this), the central pin has 191,8 ohm !!!!! It should tend like the other conductor to 0 ohm!! and check that additionally, you don't have a problem with SMA to RP-SMA
  3. 1. it depends on the cable, for example, the cable has a loss of 0,5 dB/m multiplied with the 10m gives 5dB of signal loss the 7dBi antenna acts now as a 2dBi antenna 2. no TV and WIFI are at different frequencies and a TV antenna is not optimized for 2,4 GHz 3. no it can't, the power of the USB dongle is not high enough to cause any damage due to a mismatch 4. depends on the cable (check the cable specification, the type is usually written on the cable or post a picture of the cable). 2,4 GHz is not that sensitive to small mistakes, make sure that you don't have a short circuit 5. no you don't need a shielding on the USB modem, 21 dBi make sure that the antenna is for 2,4 GHz
  4. 1. the ground of the antenna needs to be at the defined position to get a proper radiation pattern and impedance matching (mount it on a separate horizontal arm) 2. the parabolic grid antenna is made for a dipole (you don't use the full reflection area of the grid), you reflect only one part of the polarised wave (-3dB for TX and RX, MIMO is not gonna work in this particular case) an offset satellite dish is a much better choice for a reflector, kip in mind that there is a polarisation change after a reflection (SISO system limitation)
  5. If your goal is to get to 15GHz and more you are using the wrong connector. You need an SMT edge connector (I would prefer a 2.92mm connector), lowers the problem with ground Why did you cut open all metal layers? There is no need for that it only introduces unwanted effects.
  6. Expanded Polystyrene er 1,02-1,04 (99% air, water-resistant...) https://www.epsindustry.org/sites/default/files/-Properties%2C Performance and Design Fundamentals of Expanded Polystyrene Packaging.pdf end of page 4
  7. that not a problem, but depending on the frequency a 90 deg hybrid or a ratrace is a better solution
  8. it depends on how you look on the splitter/combiner - splitter, 2 output ports with a 3dB "loose" compared to the input - combiner the output has a 3dB "gain" compared to the 2 input ports (assuming the phase and amplitude match) the question is actually what you do with the splitted/combined signal in the case of an antenna, the feeding network for the patches splits the power while TX and combines the power while RX the TX antenna gain and the radiation pattern is a result of the superposition (amplitude and phase) of the patches radiation the RX antenna gain and pattern are the results of the combined patch (pattern) signals (amplitude and phase) in the case of a passive antenna, the feeding network is the same for TX & RX resulting in the same pattern for TX & RX and doubling the patch count increases the antenna gain by 3dB (combiner/slpitter)
  9. for what?
  10. for this type of antenna, a simple power splitter is not a solution (no phase shift between ports) the patches need to be driven with a 180 deg phase shift, otherwise, there will be no main lobe in the radiation pattern (in its place will be a zero) Therefore it uses a transformer (wire loop) that transforms the single-ended (asymmetric) to differential (symmetric, 180 deg phase shift) port the rest of the PCB traces (GND below) ensures a proper impedance match
  11. everything else is 50 ohm
  12. that is a power splitter (impedance matching) 2x H pol. on one splitter 2x V pol. on the other splitter
  13. there is a problem: your antenna is used to RX and TX (TDD, FDD...), and putting a PA or LNA can benefit only TX or RX the other one gets attenuated the devices have usually an RF front end IC that switches between PA and LNA mode based on control pin voltage ................. (pain in the ass to manipulate) checkup list: check that the KIP9-1700/2700 antenna is in the focus of the parabolic dish the dish is correctly oriented (not a side lobe) measure the cable & antenna (if you have some equipment), there's maybe water inside the cable... Easy improvement: get the router as close to the antenna as possible (5 meters more of ethernet cable has a lower impact on the connection than 5 meters of coax) Spend money: get a router that is integrated with the irradiator for example Kroks Rt-Pot sHw DS get a bigger parabolic dish
  14. draw me a basic schematic of what you are planig antenna impedance, source impedance ...