WiFi/LTE antenna BDM-2

[prevalrey 3]

On 23/10/2025 at 3:02, Admin said:

Si, pero tendrás que esperar...!!!

Buenas noches maestro recuerda cuando tengas un tiempo hacerme el favor de plano que te sugerí de la antena de disco para una de 2100mhz y otra de 1800mhz hoy cambie la antena del repetidor tribanda de posición y logre tener señal de la frecuencia 2100mhz pero es muy inestable por eso quiero probar con una solo para 2100mhz y si no me trabaja bien entonces solo priorizar la de 1800mhz que es la que mas se mantiene

[prevalrey 3]

On 23/10/2025 at 3:02, Admin said:

Si, pero tendrás que esperar...!!!

Buenas noches hermano disculpa, la molestia pero era para saber si le habías dedicado tiempo al plano que te pedi de 2100mhz y 1800mhz de 10 discos. Perdona que te escriba pero era para saber si me guío por tu plano o hago otro 

[DavidER 5]

On 18.05.2025 at 19:13, Admin said:

Было бы лучше, если бы версия была поменьше...

What kind of connector is this if the distance is 16mm?

[Admin 2862]

DavidER,the central pin can be extended...!!!!

[clanon 332]

4 hours ago, Admin said:

DavidER,the central pin can be extended...!!!!

copper wire same diameter...i dunno if the dielectric is needed...

[DavidER 5]

On 28.10.2025 at 17:24, Admin said:

DavidER,центральный штифт можно удлинить...!!!!

How to lengthen?

[Admin 2862]

5 hours ago, DavidER said:

How to lengthen?

,,,it could be something like this...

[clanon 332]

On 11/1/2025 at 9:16 AM, Admin said:

,,,it could be something like this...

the coax BRAIDS wires have to be FIXXED by soldering , creating a solder washer and then you can add screws and a washer to FIX IT to the main reflector (it shouldn't MOVE !)

[Havana 0]

Buenas tardes , soy del oriente de Cuba, el ciclón, me llevo la antena y quisiera hacer una nueva para los 1800 mhz con el maximo de ganancia, tengo montañas de por medio y la señal llega muy debil, gracias de antemano 

[Ilya01 0]

I ask for help in calculating and modeling an antenna (Disk-Yagi or BDM-2) with a frequency of 2.45GHz, a bandwidth of 200 MHz, a SWR of no more than 2, and a gain of at least 20dB, a resistance of 50 ohms.I would be grateful for your help.

Edited November 28, 2025 by Ilya01

[Admin 2862]

 I think such an antenna with such characteristics, besides the fact that it is very long, is even more difficult to obtain.

Anyway ,I will try to satisfy your request...!!!

[clanon 332]

17 hours ago, Ilya01 said:

 and a gain of at least 20dB,

good luck with THAT (Yagis hit a wall around 16dbi) more  than 20 is a LOOOONG YAGI...and 200mhz bandwidth conflicts with gain...(A different antenna or a PARABOLIC DISH would get the gain , not the bandwidth)

[Admin 2862]

LOOOONG TZAR YAGI...950 mm

[Ilya01 0]

that is, for a frequency of 2.45GHz, it is not possible to obtain a gain of 20db?

[Ilya01 0]

1 hour ago, Admin said:

ДЛИ-И-И-И-И-И-И-И-И-И-И-И-И-И... 950 мм

that is, for a frequency of 2.45GHz, it is not possible to obtain a gain of 20db?(and would it be difficult for you to share the model file, it will help me with my study assignment)

[Admin 2862]

length=1370mm 

[Ilya01 0]

On 11/29/2025 at 9:22 PM, Admin said:

длина = 1370 мм

and as I see on the model, the emitters are not discs but crosses, can I ask you for an explanation about this? I would be very grateful.

 can I find out the dimensions of this antenna?

[clanon 332]

26 minutes ago, Ilya01 said:

and as I see on the model, the emitters are not discs but crosses, can I ask you for an explanation about this? I would be very grateful.

is built for bandwidth (i think)...discs won't get the same bandwidth...

[Ilya01 0]

Can I please size the antenna if it's not difficult?

On 11/29/2025 at 9:22 PM, Admin said:

длина = 1370 мм

On 11/29/2025 at 9:22 PM, Admin said:

 

[mitiche 15]

On 21/12/2020 at 8:05 AM, Admin said:

,,, for the 1.8 GHz band, other dimensions are needed...!!!

hello sir thank you for your kindness im working this one for 1800 mhz my question is can i use 2 feed ? 

and about the isolation in Dv is it better with isolation or without 

Edited December 31, 2025 by mitiche

[Admin 2862]

,,,hi buddy...!!!

The isolation between the two ports in this case is not very good....

[mitiche 15]

okay thanks i will post the outcome once i finish 

ps im working next 2 days so i will finish in 3 days thanks again 

[mitiche 15]

[mitiche 15]

[mitiche 15]

finished most of the work i need my toolstik to solder properly maby ill finish tomorrow