What is the type of antenna?

[Shabra 23]

For curiously,what is the type of this feedhorn antenna?

[clanon 246]

Backfiring circular patch (CHINISHIT) 

NOBODY ever got more than 27 -28 dbi at those frequencies (800 mhz to 2700 mhz )

you'll need more than 2 meters diameter to get over 30 dbi ...

ALL lies and good looks

Edited September 15, 2021 by clanon

[Shabra 23]

That makes sense.

[Harry36 140]

Version3

[clanon 246]

MagnetoElectric Dipole (MED) more bandwidth , less gain and low efficiency on Dielectric  ( ALL metal should be better)

PS : and the TUBE DIAMETER doesn't help...either

Edited September 16, 2021 by clanon

[Harry36 140]

On 16.09.2021 at 4:58 PM, clanon said:

MagnetoElectric Dipole (MED) more bandwidth , less gain and low efficiency on Dielectric  ( ALL metal should be better)

PS : and the TUBE DIAMETER doesn't help...either

I don't know the design of the patch so that it can cover the 1700-2700 range in MIMO mode with simple powering. With the help of dipoles, this is done easily. IMHO, to expand the strip, you will need another structural element, it is either not shown in the photo, or the dishonest manufacturer did not install it, but PCB racks are used for a reason. For f / D ratios 0.25 to 0.3, you don't need a lot of directivity, 6-8 dBi is enough. the design is quite technologically advanced in production. If you look closely at the photo, you will see the TJD-1727 marking, but the frequencies are different. 1700-2100 and 1700-2700. This is China, only the sticker may differ at what frequency this design is actually designed without dimensions, it is difficult to say.

[clanon 246]

1 hour ago, Harry36 said:

I don't know the design of the patch so that it can cover the 1700-2700 range in MIMO mode with simple powering. 

 

Petra BB the best (i'll try two of those at 90 and see) 

[Harry36 140]

31 minutes ago, clanon said:

Petra BB the best (i'll try two of those at 90 and see) 

this is not Petra BB, this is Petra 9. this is not a patch, but a slot. it's not mimo. how to place two of these in an 80mm reflector?
if you place two Slot on top of each other, everything will deteriorate and there will be a problem of balancing and branching cables towards the parabola. neither slot nor patch is suitable for direct focus parabolas feed options, except for large mirrors with three arms (1.8-2m).

[clanon 246]

Yeah , you're RIGHT...

maybe ANGLED slots in a little box (cube or sphere) 

Edited September 18, 2021 by clanon

[clanon 246]

https://www.mdpi.com/2079-9292/9/10/1574/htm

 

 

[Admin 2545]

,,, by the way, maybe something like that could be used as crossed dipole...

[clanon 246]

On 16/9/2021 at 9:20 AM, Harry36 said:

Version3

 

 

 

 

[Harry36 140]

40 minutes ago, clanon said:

 

different feeding. in the first variant - direct feed (you need a balun), in the second case - Y probe. the second option is the overlap in terms of 1700-2900. but the dimensions must be multiplied by 2+

[clanon 246]

the green PCB seems DOUBLE SIDED with lots of THROUGH HOLES...

[Harry36 140]

version6

Edited October 8, 2021 by Harry36

[Shabra 23]

[clanon 246]

is it the same on the back of the PCB...(the leaf shapes)

[Shabra 23]

[Shabra 23]

[Shabra 23]

[Harry36 140]

https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=8672061

1700-3800. fr4.

 

Edited October 11, 2021 by Harry36

[Harry36 140]

2 hours ago, Shabra said:

 

balun to a neighboring dipole?

[Admin 2545]

[Shabra 23]

[clanon 246]

14 hours ago, Harry36 said:

balun to a neighboring dipole?

1:1 Pawsey stub...?

Edited October 12, 2021 by clanon