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clanon
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Everything posted by clanon
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I would give it a go ...BUT with circular patches...we'll see...(you had one like that YEARS ago... mimo...remember...
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yup...5.84 cm by 5.4 cm...(these are HIGHLY related to the Dielectric Factor , change from 0,4 to 0,5 would change several millimeters these dimensions)
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it would be interesting...could be Laser cut or stamped...Wires have more REACTIVITY (Imaginary Z) Inductive reactance...impedance curve is always smaller...2mm copper ...maybe... Copper tape is easy to cut with cutter under print drawing taped on top...perfect you get more losses in the metal distances should stay the same and sizes... to keep a good Impedance and low 2 mm or LESS from reflector the Feed network Patches 4 mm or more from reflector (there is a step of 2 mm)
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Styrofoam (lowest density better) cut with resistance wire (nichrome) at 2 mm flat
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i have A model (my ssd failed with the original but i had the dimensions on paper) could put the dxf of the feed and patches are ALL the same 42 by 44 cm reflector Model should be customized to Dielectric used in each case branches.dxf Centerfeedline.dxf patches.dxf
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Feed network is at 2 mm from Aluminum Reflector , Patches are at 4 mm from Reflector... There's a "tendency" these days to believe that Laser cutting-3D printing and AESTHETICS are a key factor...FALLACY Energy doesn't care about aesthetics it only Flows were possible , mm or single degrees error don' make much of a difference BUT dielectric Constant MUST BE KNOWN...to get to the ballpark.
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Efficiency of Polystyrene foam ...is unbeatable... More losses on metal than dielectric...
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Brass 0.2 mm (patches and Central Feed) , Copper Tape (0.0254 mm) feed branches
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REFLECTOR SIZE ! (and SHAPE) that's where the 17 dbi come from...
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Polarization of slots is 90 degrees OPPOSITE of that of Lineal Dipoles-Monopoles , etc... Vertical slots = Horizontal (lineal) Polarization Horizontal slots = Vertical (lineal) polarization PS: equivalent to a Magnetic dipole due to Electric field energy on slot's borders...
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IT only WORKS witha 4:1 BALUN (200 ohms at feed point BALANCED) it is a GREAT antenna (i build it and i am USING it right now) over 18 dbi Balun design
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almost NO GAIN
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http://www.prc68.com/I/AgilentE4404B.shtml and ALL of them LIE on the GRAPHs... under 5 dbi GAIN mostly check it out: EX03B_RFSpace-UWB1_Excel-Summary.xlsx
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over 100 us$ FOR NOTHING...fucktards buy stuff for their LOOKS! lmao
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https://antennatestlab.com/antenna-examples/example-3-vivaldi-antennas-rfspace this is the MOST EXPENSIVE vivaldi out there...and it SUCKS under 1000MHZ... I was tryin to change that...did my research...Build some antennas after MONTHS of simulations...still do... LPDA is the BEST for uwb with a DIRECTIVITY (7 dbi without reflector 12-15 with reflector) CAN't beat that BUT it's hard to build...
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under 1000 mhz that is...3 4 dbi They get gain over 1ghz
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YES it is complicated...but the results are REALLY GOOD The Vivaldis have NO GAIN...(THIS have 7dbi or more over the WHOLE BAND) Thinking in cutting copper tape by hand ... after printing the dwg dxf 1:1 blueprints... CAN NOT be made in PCB board (distance between HALFs are changing gradually from back to balun) making it on pcb board would get you HUGE variations on Impedance over the whole band...
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Make some modifications, distance parallelism has been CURVED to allow for a soft Impidance curve... 6-7 dbi gain from 300 Mhz to 6000 mhz best response is between 1 ghz and 4 ghz... looks good to me SDR is the intended use...
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12.3 inch long x 1.02 inch diameter ferrite rod core for maximum reception 31 cms x 2.6 cms OLD AM radio variable cap i'll try in the next days and post if GOOD..,.
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Loop antenna (antena de Lazo) should be straight away design in CST... Lots of WIRE wounds and a Port at the ends... 10-30khz...i'll give it a TRY in CST LOTS of wire for that LOW... Alonso para que uso la vas a usar...(What use you're planning for this...?) https://stormwise.com/page28-VLF.htm
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Without a reflector (Omnidirectional) you'll need 1 meter and some to get close to 15dbi (15-20 half waves) With reflector you could have 15dbi at under One meter...