dipole patch by hfss [60 point award]

[Marshal]

hi all;

i want to supply a microstrip antenna with a planar dipole patch in HFSS.
(as you see in this figure)
notes :
1- the feed must locate at center and suplly symetrically both arms
2- the feed must be wave or lumped port , because i need input impedance
i don't know which method is the best excitation for this structure ? and how should be supplied ?
wave port or lumped port ?

60 point award is for the best reply (i don't have more)

 

[jallem]

Re: dipole patch by hfss [44 point award]

there you go....

 

[Marshal]

Re: dipole patch by hfss [44 point award]

dear jallem:

thanks for your reply,
but
there is a basic different between your stracture and mine!!

your stracture does not have ground plane. i know what should i do for such stracture (with out ground plane)
but

in fact my problem is that : how should i define lumped port when the stracture has a ground plane ???
thanks again.

 

[savedadogs]

Re: dipole patch by hfss [50 point award]

I think you can draw a metal patch right between (maybe with a gap) the two dipole arm and connect a coax feed to that center metal patch.

Here is what I mean:

                     arm1                  patch            arm2
            -----------------------   ------   ------------------------
                                         |
                                         |   (coaxial feed)
-----------------------------------------------------------------------  (ground)
                                     |   |   |
                                     |   |   |

 

[Marshal]

Re: dipole fix by hfss [50 point award]

I think you can draw a metal fix right between (maybe with a gap) the two dipole arm and connect a coax feed to that center metal fix.

Here is what I mean:

                    arm1                 fix            arm2
            -----------------------   ------   ------------------------
                                         |
                                         |   (coaxial feed)
--------------------------------------------------------------------  (ground)
                                     |   |   |
                                     |   |   |

dear savedadogs,
thank you for your reply,
I'd wrote: "1- the feed must locate at center and suplly symetrically both arms"
but it means that, at center, the current must be enter to one arms and exit from another. infact i'm going to simulate an ordinary dipole antenna but in the form of patch and on a substrate with ground plane.

                  current---->                        current----->         
 (arm1)  -------------------------           -------------------------  (arm2)
                                         
                                   substrate
-----------------------------------------------------------------------------  (ground)
                   <---- current                        <---- current

 

[aboozar.hamidipoor]

Re: dipole patch by hfss [50 point award]

i think what you required exactly is the stracture below, but i don't know realy how should you simulate it in hfss.

 

[userdce]

as for ur circuit

for patch 1 there is direct microstrip feed as shown and for patch 2 , microstrip feed with 180 phase difference is applied

this phase shifting can be got by meandered line

hope it works

optimize the circuit so that feeding is having low loss