OMNI ANTENNA

[tharun 0]

Hi all,
I am currently working on a project where i have to transfer video signals to a distance of 10km. i want to know that can i use a omni antenna on one side and a directional antenna on the other side. reason for using omni antenna is that side is a rotating fixture .so we need 360 degree coverage. i want to know whether this will work and also if there is any omni antenna which can transfer video signals you can share the datasheet\part no.

[Admin 2578]

,,, maybe it would be interesting to see these...

https://www.lan23.ru/forum/node/340

https://deracahyono.wordpress.com/2011/02/26/isi-omni-built-up-hyperlink-15-dbi-review/

https://www.lan23.ru/forum/node/462?t=978

[Jayakumaran S 0]

On 3/23/2022 at 6:53 PM, Admin said:

,,, maybe it would be interesting to see these...

https://www.lan23.ru/forum/node/340

https://deracahyono.wordpress.com/2011/02/26/isi-omni-built-up-hyperlink-15-dbi-review/

https://www.lan23.ru/forum/node/462?t=978

sir i want to improve the omnidirectional antenna at 340MHz with gain of 25-30dBi, is it possible? , can you send any design images or design files that match with my spec, please help me sir.

[Admin 2578]

,,, with gain of 25-30 dBi,I think is not possible...!!!

[Jayakumaran S 0]

34 minutes ago, Admin said:

,,, with gain of 25-30 dBi,I think is not possible...!!!

thank you for your reply sir, please send any omni directional antenna source img or dwg files for improving the gain atleast 12-15dbi. 

[clanon 258]

On 5/27/2024 at 2:00 AM, Jayakumaran S said:

sir i want to improve the omnidirectional antenna at 340MHz with gain of 25-30dBi, is it possible? 

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...

[Jayakumaran S 0]

On 5/28/2024 at 9:57 PM, clanon said:

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...

sir i need omni within 500mm length and having the gain of 12dbi what can i do sir, i did array and metasurface , is there any other option to improve the gain sir. Thank you sir for your consideration. 

On 5/27/2024 at 10:36 AM, Admin said:

,,, with gain of 25-30 dBi,I think is not possible...!!!

thank you for your reply sir, please send any omni directional antenna source img or dwg files for improving the gain atleast 12-15dbi. 

[clanon 258]

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...

[Jayakumaran S 0]

9 hours ago, clanon said:

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...

sir i want slighty wider band(50MHz band width), i did array and metasurface , is there any other option to improve the gain sir.

[clanon 258]

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...

Edited May 31 by clanon