Kalyan Sundar Kola

You can follow the link https://www.researchgate.net/post/What_are_the_ways_to_achieve_circular_polarization_in_antenna

Thanks,

Ardhendu

Dear Kalyan Sundar Kola

The answer of Ardhendu Kundu is helpful also the topic is a little bit different because it discusses how to create circular polarization (single not dual).

For dual circularly polarized in CST, you should have two ports and then you will find all analysis numbered by [1] or [2] and you can change the axes of the fields plots to circular and plot Right-hand CP and Left-hand CP. Also to be sure that you have a good circular polarization (not elliptical one) you need to see the Axial Ratio (AR) and it should be below 3dB for both polarizations at the required frequency band.

Dear Kerlos Atia Abdalmalak Sir,

Thank you so much for your attention and helpful reply.

I have an another query.

Is it possible to get LHCP and RHCP from an array at single frequency using a single Port of excitation in CST and the amplitude of LHCP and RHCP gain is almost same?

Is it so called Dual-circular polarized or Linear polarized or Simple LHCP or Simple RHCP?

Please draw you kind attention sir.

If at one freq the amplitude of LHCP and RHCP is almost the same, this is means that you have a pure linear polarized antenna.

To have circular polarization, one CP component (either RHCP or LHCP) need to be more 15.34dB higher than the other one else you have either elliptical polarization or linear one.

You can know that from CST by looking to AR value also to have a rough estimation in your mind without simulations you can use the attached small MATLAB code where you can put the difference value between the RHCP and LHCP (which called XPD) and estimate the AR in dB, if it is below 3dB so you have a CP if you have very high for example more than 20 or 30dB so this means linear polarization

Hi, you would better to define a plane without assigning material in front of your antenna in CST and then check the variation of E_field vector versus phase variation. If E-field vector rotates circularly then you have CP. the direction of E_field rotation, determines the LHCP or RHCP.

The question is little bit confusing. Are you asking for dual polarization or circular polarization. A CP always consist of LHCP and RHCP. Hence the term dual CP may not be correct in true sense. Dual Polarization (DP) is different and Circular Polarization (CP) is different. Please, give more information of your query.

Sudipta Maity Sir,

Kindly refer some papers regarding Dual-polarization and the circular polarization in current issues.

Thanks for you kind attention.