Biquad Antenna

[Admin 2627]

Where did you get it from?...give some more clarifications...!!

[clanon 268]

double post

Edited December 1, 2023 by clanon

[clanon 268]

On 29/11/2023 at 7:15 PM, eco32 said:

No one did it with biquad

 

nope...BUT those complex feed networks steal gain (several db)

[Admin 2627]

,,,"clanon","eco32",,,,,,,the place of these antennas is not here, possibly open a new topic...!!!!

[eco32 42]

a)New aproach, converting biquad to biloop, not tested yet
quick and careless soldering

b)Four biqads for array, eventually there will be six (I have 1:6 powe combiner, thats why six)

[Admin 2627]

gooood,,,for what frequencies were the antennas made...??? the biloop antenna needs a diameter of 40.5mm for the frequency of 2.442 GHz

[eco32 42]

1296MHz, previous tests have shown that the antenna also works on the higher bands. I will take two on the VNA and do an S12 between them, then we will know what it looks like.

 

6xbiqod project has name "MATHYLDE"

Edited March 28, 2024 by eco32

[eco32 42]

A very old design from the time when there was no access to VNA or simulation programs. I'm not sure if this design makes sense, but it looks cruel
(purpose TV broadcast)

[gabiromaniadeva 2]

On 11/20/2023 at 11:19 PM, eco32 said:

 

Thats the biqaod, is there an chance to achive circular polarisation with two biqoad or biloop antenas using only phase shifter?

(two biquads oriented at 90 degrees to each other)

 

 

 

[eco32 42]

what a biquad?
It look like a "mother" of all biquads,  wild dualband antena , from the propostion il look like it is for ~ 106MHz  500Mhz.

(this design may be suitable for LTE420, LTE450  + Tetra and other trunkng systems VHF+UHF)

Edited February 10 by eco32

[eco32 42]

"From R-409, on a common reflector there are two antennas, one larger 120-240 MHz gain 9 dB, four smaller 240-480 MHz gain 13 dB."

 

 

[eco32 42]

biquad  or "double square" is also called "антенна Харченко" and searching for this name in google opens the gates of hell!

[clanon 268]

http://www.radioamatoripeligni.it/i6ibe/turnhard/turnhard.htm

Edited February 10 by clanon

[eco32 42]

23 hours ago, eco32 said:

 

"Two-element in-phase antenna array, zigzag radiators with a reflector (DB-11). Frequencies 120-240 and 390-429.8. Were on the R-415, R-419.
Army VHF antenna DB-12 from the R-415 radio set. It is a broadband dipole. The dipole arms are 20 cm each. Operating frequencies from 390 to 430 MHz."

VHF 120-20MHz in VHF 9dBi
UHF 390-429.8Mhz  in UHF 13dBi

Gain of those version with grid is unknown
 

[Admin 2627]

,,,,eco32, it would be good if you could give some dimensions...!!!

[eco32 42]

12 minutes ago, Admin said:

,,,,eco32, it would be good if you could give some dimensions...!!!

It exist in R-415, R-419 manual, it is out of the google searchnig, i did not check Yandex.ru yet. It exist in paper version, some hams from my area has it, it is not eassy to get.

It may comes from Radio Factory Omsk

[eco32 42]

@Admin
"From R-409, on a common reflector two antennas, one larger 120-240 MHz gain 9 dB, four smaller 240-480 MHz gain 13 dB."

"Two-element in-phase antenna array, zigzag emitters with a reflector (DB-11). Frequencies 120-240 and 390-429.8. Stood on R-415, R-419.
Army VHF antenna DB-12 from the R-415 radio kit. Represents a broadband dipole. Dipole arms are 20 cm. Operating frequencies from 390 to 430 MHz."