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Admin
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Everything posted by Admin
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I'm not so sure of that...!!
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,,,the gain which can be obtained with a parabolic reflector is proportional to the square of the frequency. If this mirror to 2400 MHz can give such as 21 dBi,for 800 MHz,the gain 9 times (9.5 dB) lower than, i.e. about 11.5 dBi ,,,the strengthening of the parabola is G=e * 4 * pi * S / lambda^2, where S is the area of the aperture in m2, lambda is the wavelength in meters, e is the coefficient of the use(e- efficiency aperture reaches 55-65%) ,,,for e=77% => F/D=0,75 where F=focus of parabola : D=diameter of parabola
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,,,study the parabolic(offset) antenna calculation...!!!!
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,,,, wrong, MikroTik SXT RB LTE 3-7 antenna is not in the offset disk focus
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the antenna geometry must be chosen with vswr <1.5
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Made something like this, but the features are not very impressive,... The reflective hyperbole should be adjustable and its diameter must be d = 0,1317 * D ...!!!!
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ns2 and ns5-antennas...
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GELLAN FULLBAND-18M Support MIMO technology. The data transfer speed of up to 299 Mbps. Specifications Support cellular standards.........................3G/4G Operating frequency range, MHz...................................1700-2700 Gain, dB.......................................................18 Input impedance, Ohm................................................................50 The CWS in the operating range.................................................... < 1,5 Antenna polarization.........vertical/horizontal Connector type.................................................................. 2xN-Female Weight and dimensions Weight, kg.........................................................................................2,8 Overall dimensions, mm.......................................450х450х40
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A file for practice execution... wifi_board_0.pdf
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No, it's still working on the impedance. Your drawing on CAD is on PCB...??
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there is no big difference..!!!
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Aomway Tripple Feed FPV Antenna Good radiation efficiency. Most FR4-based patches have terrible efficiency because FR4 is very lossy at 5.8 GHz. Good axial ratio, not just directly perpendicular to the patch but also off-center. Specifications Center frequency: 5.8 GHz Bandwidth: 700 MHz (5.3– 6 GHz) Matching: S11 < -20 dB, VSWR < 1.5 (at center frequency) Axial ratio: < 1.3 Antenna gain: 8 dBi Half power beam width: 55° (horizontal and vertical) Radiation efficiency: 83.5% weight :15g size: 60*60*22mm Connector: SMA (Blue) / RP-SMA (Red)
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why not 4x4..???
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,,,meaning that..?
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Yes, it looks like this antenna is good ... !!! MiMo Circular Polarization
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It can also be horizontal...!!
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,,,something like that(with Cu Wire), it's easier to build....!!!!
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,,,from where did you get it..???
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"No one, both of them are chinese lies...!!!!
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,,,a simplified constructive solution with Cu-wire transmission lines...
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My old variants of the antenna sector...
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And there's also an 8-patches antenna sector with circular polarization...
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,,,the zinc sheet does not oxidize quickly....!!!!
