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
831 -
Joined
-
Last visited
Everything posted by clanon
-
you gonna need tubing (aluminum old TV antennas) 10 mm or more...MOST Array aren't omni , metasurfaces are a LIE...VERTICAL FRANKLIN Collineal is the way...BUT MOST I see are folded dipoles with facing on the coax...SO a SIMULATION is NEEDED for ONE DIPOLE and then multiply by at least 6-8 or 10 units and facing COAX should be calculated...for 340 MHZ and 50 mhz bandwith...
-
12 dbi omni is doable...what wideband arround 340 mhz...? (Narrow = Wire , Wide = Tube) but you gonna end up close to 5 meters having 44 cm each dipole... a big Tower...for omni...
-
OMNIdirectional and high gain are MUTUALLY EXCLUSIVE can not have BOTH...at 340 mhz omni Vertical colineal VEEERY LOOONG could get you 15 dbi...using several meters of wire...
-
it would be GREAT to put a VNA there on ALL 5 and check HOW they behave ...tho
-
what standard (speed) and frequencies ?...2.4 5.8 A B G N ...AC 2.4ghz b/g/n High sensitivity (- 96 dbm at 1mbps) anything with AR9271 (Tplink tl-wn 722n Version 1) 150 mbps max
-
VNA measurements
-
FR4 have lots of disadvantages (efficiency at RX lost , losses at TX a lot ! , never know the Tangent loss and dielectric constant for each material , fr wouldn't be on POINT ever ) you'll need an antenna analyzer or vna to be on frequency PS: only "advantage" size is smaller than metal on air
-
https://www.lan23.ru/forum/node/318855
-
yeah , it's easy with the model....pretty sure you are gonna end close to 1 meter by 60 cm or more GRILL...
-
Wire grill (big 80 cms at least) OR parabolic dish EVEN BIGGER 1.2 1.5 meters
-
Easier ,for me, if YOU choose ANY 2-3 patches design (10dbi) ( need a frontal picture) and then we'll make it work at 725mhz...
-
Easily 12 dbi at 725 mhz
-
-
Could be made to ANY frequency , Circular pol (could be made lineal easy) efficiency could be better NOT using FR...
-
4:1 balun (50 ohms to 200 ohms , 75 ohm to 300 ohms , etc)
-
Correct adaptation from 50 ohms to 300 ohms antenna (Quarter wave long should take velocity factor of Coax in length ) 0.66 PET , etc
-
a Ratio between antenna Impedance and radio impedance the bigger the difference bigger the losses...let's sat 300 ohm antena/ 75 ohm radio 4:1 VSWR = close to 40% reflected power on TX...on RX it's gonna be WORSE...(small signal)
-
0.2 0.3 BRASS paper...? and a sharp cutter...several tries (using a printed PAPER taped on top) cut through the printed lines...? solder the vertical strips... PS: 0.2 is pretty RIGID...
-
Yagis hit a WALL at 15 dbi most of the times (with 15 elements and a BIG reflector)...you need 2 for 18 dbi , 4 for 21 , etc
-
-
-
nope...BUT those complex feed networks steal gain (several db)
-
double post
-
Water absorption should be adressed in PES foam...Changes ALL. PVC pipe has THIS weirdness...
-
LOOP should be CLOSED at feeding Points... then , EACH Loop should be feed with 90 degrees phase difference