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Admin
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Everything posted by Admin
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,,, so the antenna sector with patches for 5,8GHz....????
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S11, S22 must be greater than -15dB S12, S21 must be greater than -26dB
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" with what kind of vibrators to be ...???
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"Well, but this antenna does not have good isolation between the ports, see S11.S21(S21,S22) in the diagram above...!!!! The antenna needs to be improved....!!!
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"what do you understand through closed / open circuit...??? "this is a monopole antenna placed in a truncated polyhedron reflector...!!!!
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Well, but D.Dobricic has done these simulations for a long time....http://www.qsl.net/yu1aw/ANT_VHF/obelisk_antenna.htm
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A simpler solution for getting a wide band panel antenna is this ... With some very good results...
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And yet, an ideal form would be this... ,,,or this...
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,,,,yes,this is a combination of corrugated horn-antenna and short backfire antenna...!!! ,,,this it"s corrugated horn...
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Antenna Beamwidth : Horizontal: 60° Vertical: 30°
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okay and these are the results of my simulation with approximate dimensions...
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"Thanks Pragata, but some dimensions are needed at the adaptation lines...!!!! and the distance between the patches...!!!
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,,,and here is a model sector antenna, made by the user Pragata...
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,,, it is advisable to round off the corners of the patches...
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,,,,these are the results of a first simulation, impedance adjustment for 50 ohm has to be done... MEDA is powered by 50 ohm SMA connectors
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In recent years, dual-polarized antenna has become one of the favourite choices of antenna designers due to its attractive features, such as doubled capacity of communication systems by frequency reuse, reduced multipath fading of received signals by polarization diversity, and improved transmit-receive isolation. The prototype antenna can achieve a bandwidth of 25.7% (0.78 GHz–1.01 GHz) with a stable gain of 7.8 ± 0.7dBi for the lower band, and a bandwidth of 45.7% (1.69 GHz–2.69 GHz) with a gain of 9.5±1.1dBi for the upper band. Input isolation exceeding 30 dB has been obtained in the wide bandwidth. Thus, it can be potentially used as a base station antenna for 2G/3G/LTE networks. Basically, the proposed antenna consists of two pairs of double-layer U-shaped electric dipoles with apertures, two pairs of shorted walls, a pair of biorthogonal dual-layer -shaped feeding structures and a horned reflector. The dimensions of the antenna are 206×166×88mm3. Besides, the thickness of the copper patches is selected for 0.3 mm after taking the versatility and cost into consideration. ,,, according to ...Hindawi Publishing Corporation International Journal of Antennas and Propagation Volume 2014, Article ID 480268, 10 pages
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Винни, пожалуйста, разместите более подробную картину с этой конструкцией ... !!!! «и особенно для этих монстров ...
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,,,otherwise constructive solutions... ,,, with round patches and box reflector... ,,, with rectangular patches and box reflector...
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,,,another Russian model....
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,,, another form of patches feeding...
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a sector antenna variant with curved dipoles... ,,in ABS tube(110mm diameter)...
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,,,a simpler method by using a winged reflector...
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"""depends on the position of the feed point and transmission lines ......!!!!
