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swarg_eu

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About swarg_eu

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  1. 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.
  2. 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
  3. that not a problem, but depending on the frequency a 90 deg hybrid or a ratrace is a better solution
  4. 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)
  5. for what?
  6. 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
  7. everything else is 50 ohm
  8. that is a power splitter (impedance matching) 2x H pol. on one splitter 2x V pol. on the other splitter
  9. 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
  10. draw me a basic schematic of what you are planig antenna impedance, source impedance ...
  11. Something that you can build by your self
  12. 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)
  13. 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
  14. finally got the time 4-way_TOP_75.dxf