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,,,,aaaaaa, that's what you want..???

,,,4 sides,not 5 sides...???

,,,what do you understand "surrounded by steel on 5 sides"...????

,,,maybe only with more directors...!!!

,,,hi buddy...!!! I don't think I have this file anymore, but I will resume the simulation, if you want...!!!

,,,can someone be interested in something like this///...???

,,, the antenna is not well designed, it needs a stub...

,,,these would be the results... to see the axial ratio in CST, you should look at "Farfields" section in the simulated results... there should be a drop down list after simulating the design. if you click on that drop down list you should be able to see the axial ratio plot... The default plot is in 3D format, if you want to plot it on polar form, you need to right click on a farfield result and select "Far field plot properties", In the "General" tab select "polar" for the "plot type" and choose the values for "Theta" & "Phi" according to the orientation of your design. Then select "apply" to see the results

Hi buddy...!!!! ,,,what version of CST do you have...??? ,,,can you post the CST file..??

,,, yes, increase the diameter of the reflector (not too much) and increase the number of directors..!!!! ,,after a certain number of directors, the gain does not increase so much..!!!

,,, these would be the dimensions... ,,,and this is the CST file....!!! vivaldi rus.cst

I don't think this so-called Vivaldi dipole is very good...

,,,something like this... 2021213791.pdf

,,,hi buddy...!!! ,,,from where did you get this Vivaldi antenna( you simulated something like that...???)..??? ,,,maybe this will help you...!!! https://www.changpuak.ch/electronics/Antipodal_Vivaldi_Antenna_Designer.php

,,,yes, both the central connector and the Teflon insulation can be shortened...!!! ,,,this is CST-file... N-P245 mufa.cst

,,,I considered it sensible to resume Aurel's idea from the beginning and to present a version of the Batwing wire antenna...

Here is another DIY antenna, this time for GSM/3G/4G usage. The design was calculated for 800-2100MHz and works well in this range. The antenna has a very broad bandwidth with a low gain and can be used for any application within the frequency range. Since the results are very good even up to 3GHz the antenna is also useful for WiFi. As well as ADS-B (flight radar) because 1090MHz is covered too. In general an excellent antenna for rtl-sdr operations. Based on this calculator.

By the addition of directors rings at a cantenna, can get better directivity...

V-shaped antenna in the air, without dielectric support...

,,,yes, it is better that way ,than putting a single antenna with two ports (MiMo)

,,yes,ZTE MF920VS, Frequency 2.4 GHz, Supports Bluetooth 802.11b, 2.4 GHz Radio Frequency ,,,but where does this modem have the connectors for the external antenna...???

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

,,,maybe you want something like this...

,,welcome,,,!!! ,,,so, for which frequency do I want the antenna panel..??? ,,,and MiMo to be...??? ,,,your antenna from the pdf file is not working well...!!!

,,,this tube diameter is not critical(20-30mm)...!! I will also give the dimensions of the Batwing antenna.