Welcome to WIFI Antennas
Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.
clanon
Members-
Content count
768 -
Joined
-
Last visited
Everything posted by clanon
-
Efficiency of Polystyrene foam ...is unbeatable... More losses on metal than dielectric...
-
Brass 0.2 mm (patches and Central Feed) , Copper Tape (0.0254 mm) feed branches
-
REFLECTOR SIZE ! (and SHAPE) that's where the 17 dbi come from...
-
-
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...
-
-
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
-
almost NO GAIN
-
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
-
-
over 100 us$ FOR NOTHING...fucktards buy stuff for their LOOKS! lmao
-
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...
-
under 1000 mhz that is...3 4 dbi They get gain over 1ghz
-
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...
-
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...
-
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..,.
-
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
-
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...
-
Insulators , supports should be on the middle of ANY half wave dipole (ti minimize losses and mismatches)
-
-
Interesting design , don't know about performance... Polyurethane aluminum PATCHES Manufacturer
-
Jomy , NEED HELP this SUCKER doesn't take energy , Z is wrong (Too LOW) S11 (too LOW) almost 0 Vswr HIGH as HELL (PS: tried everything can't make it "dance")
-
manufacturer site
-
Originally designed for 5.8 (with HIGH LOSSES and low gain) Inverse engineered to 2,4 ghz wjith High GAIN and Better Efficiency s on FR4 ...modelling right now...almost there...Close to 20dbi
-
I'd never found a good feed for DEEP DISHES ( i have a 1,26 m , 0.31 m deep dish F/d 0.25 ) THIS IS IT This brasilian colleague designed an small patch for 432 MHZ satélite double polarization (i only needed ONE) What's most important to me are the 180 degrees of illumination at about -6 db of gain... -6dB beamwidth of around 180 deg (good for f/D ratios 0.25 (focal plane dishes) to 0.3) -6dB in beamwidth corresponds to a -10dB edge illumination (max gain) since there is an additional -4dB spreading loss to the edge at these low f/D ratios. the coax is running inside a graphite tube (all i have at hand from a broken arrow) center of patch and coming back from behind