Dear Sunik Kiran,

E and H planes are basically the principal planes, E-plane means the plane containing the electric field while H-plane contains the magnetic field. Co-polar means when the polarization of both the transmitting (test antenna) and receiving antenna (reference horn antenna) is the same and cross polarization means when the polarization of both the antennas are different.  First, you have to find which plane of the coordinate system where your antenna is placed contains the E or H field. once this is know then you can easily check the co and cross polarization. Generally the Co polarization is very high as compare to Cross polarization.

In HFSS, first find the plane containing the E-field, e-g Y-Z plane contains the E-field, then go to results--> ceate far field report-->directivity or gain --> directivity phi or directivity theta and plot the result. this will give you the co and cross of the E-field.

Dear Sunik Kiran,

E and H planes are basically the principal planes, E-plane means the plane containing the electric field while H-plane contains the magnetic field. Co-polar means when the polarization of both the transmitting (test antenna) and receiving antenna (reference horn antenna) is the same and cross polarization means when the polarization of both the antennas are different.  First, you have to find which plane of the coordinate system where your antenna is placed contains the E or H field. once this is know then you can easily check the co and cross polarization. Generally the Co polarization is very high as compare to Cross polarization.

In HFSS, first find the plane containing the E-field, e-g Y-Z plane contains the E-field, then go to results--> ceate far field report-->directivity or gain --> directivity phi or directivity theta and plot the result. this will give you the co and cross of the E-field.

I do agree with Jamal Nasir. Co-polarization, when polarization of both transmitting antenna and receiving antenna is same, it may be E plane or H plane, depending upon the direction of electric field lines and magnetic field lines. As, from HFSS you can easily check by plotting the behavior of electric field and magnetic field as well as you can also easily get the types of polarization for antenna you have designed. by seeing the nature of radiation pattern in 2 D (polar plot), you can decide the plane of polarization and types of polarization.

Thanks

Yes, off course, Jamal Nasir explain it clearly , simply co-polarization are wanted radiation antenna in desired directions ,Where as cross-polarization are unwanted radiation .Or cross-polar are the dissipation in antenna radiation , in some areas like RCS ,cross-pol must be reduced.

To Jamal Nasir and Smrity Dwibedi,

Thank you. Could you please tell me how to get E-Plane Cross Pol and Co-Pol in HFSS. Please tell me the steps. (Means HFSS->Results->Create Far-Filed report->....?

Thanking You.

Sounik Kiran

HFSS-> Results->Create Far-Filed report->Radiation pattern(this is for polar plot)->go to familes tab and select phi=90 (for YZ Plane)-> select trace tab->directivity->directivityphi (CO)->dB ->newreport. repeat the same steps until directivity then directivitytheta (Cross)->dB->add trace. this will give u the co and cross components on the same polar plot. 

NOTE: i am taking YZ plane as E-pane because the antenna that i am using has E-field in the YZ-plane. You can also check the plane of your E-field by plotting the E-field plots.

To

Jamal Nasir

Thank you very much.

Thanks for your Help. I've little confusion. E-plane means the plane which contain maximum power of E-fields. H-plane means the plane which contain maximum power of H-fields. We calculate it from far-field patterns. How can we decide it from internal field patterns as you have suggested it.

First of all, when we talk about polarization we are concerned with the electric field vector, thus, Polarization is  the property of the EM waves describing direction and magnitude of the E-field vector.

Linear Polarization: The E field Vector changes only in magnitude which can be vertical or horizontal linear polarization.

Circular Polarization: The E field vector remain in constant magnitude but the direction changes and rotate toward the direction of the wave propagation eg  Right hand circular and left hand circular polarization.

Elliptical Polarization: The E field changes in both magnitude and direction. also can be Right hand or left hand elliptical polarization.

Co and Cross polarization

Cross polarization also known as X-polarization is the orthogonal radiation of the desired linear, circular and elliptical polarization for example if the desired is horizontal then the orthogonal will be vertical, also if the desired is Right hand polarized the orthogonal will be left hand polarized.

Co polarization on the other hand is the desired polarization of the radiated wave.

I am agree with Jamal. Nasir

Thanks all.

I am also having confusion. How can we decide in HFSS about the plane of polarization and types of polarization by looking fields?

Thanks for the kind reply by respected Prof. Musa. These information are accepted but we can't get the far field patterns i.e. co and cross pol from internal field patterns. If you have any reference, please share these to us.

In simple words, the co-polarization is the antenna's radiation in your desired directions. Where as the cross-polarization is the antenna's radiation in the unwanted directions, i.e the cross-polar is basically considered as a dissipation in antenna radiation.

Such a healthy discussion! My thanks to all fr your valuable answers.

A small doubt...during checking the Axial Ratio in HFSS, what should be the angle of Phi and Theta?

Sounik Kiran : We generally set it to broadside direction. If your CP is in tilted direction, then find the direction from the simulated data and plot the axial ratio (AR) at that direction. Measuring AR in one direction is not a good sign or research. For true CP, AR will satisfy the criteria at phi = 0, 45, 90 and 135 deg planes. Otherwise, it can be DP, we cant say anything.

All the best

Sudipta Maity Sir, for phi = 0, 45, 90 and 135 deg plane theta will be 0 degree or not

In most of the cases co-polarization is greater than cross polarization. It means more radiation in the desired direction and less radiation in the unwanted direction