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About swarg_eu

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  1. 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
  2. everything else is 50 ohm
  3. that is a power splitter (impedance matching) 2x H pol. on one splitter 2x V pol. on the other splitter
  4. 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
  5. draw me a basic schematic of what you are planig antenna impedance, source impedance ...
  6. Something that you can build by your self
  7. the important thing isn't RSSI but SNR by rotating the antenna for 45 deg, you RSSI dropped bay 3dB but you SNR increased you seem to be a victim of CSMA/CD & CSMA/CA there are maximum 14 (Japan2) channels on 2,45 GHz WIFI and there is someone on the same channel Get a directional antenna ~18 dBi, with some luck the interfering signal is not in the direct line between you and the AP. If needed with the 18dBi antenna, you have some space to get rid of the negative effects of the CSMA by putting a 5~10 m long cable to attenuate the interference to a level where the CSMA won't react (it won't stop the transmitting, package drop)
  8. on the 75 ohm line, the radius is 7 mm, 3 mm from the end of the PCB 6 mm long line with a cut in the middle of 0,4 mm to solder the 150 Ohm resistors All 3 splitters have the same dimensions: the radius on the transformer lines is 2,5 mm and the axial distance before the bending (from 75 Ohm line) is also 2,5 mm the axial distance in the Wilkins splitter is 11,28 mm between the centers of the two radius bends the axial distance of the transformer lines is 2,88 mm (near the 150 Ohm resistor) The horizontal distance between the two spitters is 25 mm 75 Omh line 1,2 mm transformer line 0,48 mm
  9. finally got the time 4-way_TOP_75.dxf
  10. that no problem waths the frequency range?
  11. yes, I would choose v2
  12. finally got the time for the splitter version 1 - a combination of Wilkinson and impedance transformer isolation >10 dB between the 4-antenna ports version 2 - Wilkinson (the 50 Ohm line between the splitters is long and introduces some side effects in S33) isolation > 20dB between the 4-antenna ports for both versions, the GND VIA connection is modeled as a solid in the substrate (faster simulation), port 1 antenna input port 3 combiner output 4-way_v1_TOP.dxf 4-way_v1_VIA.dxf 4-way_v2_TOP.dxf 4-way_v2_VIA.dxf
  13. 75 or 50 ohm system? 2 or 4 way splitter? Is FR4 1.6 mm ok?
  14. Yes the length of the transmission line needs to adjusted https://www.microwaves101.com/encyclopedias/wilkinson-power-splitters The simulation results for the DVB-T2 splitter