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doubt in designing coaxialfeed in HFSS

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priyarajan

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I have designd an MIMO antenna with Co-axial feed .whether co-axial feed should be within the airbox or out of airbox .Here i have given equal height for airbox and feed.My design should generate frequency range for GSM, PCS and LTE .BY i am getting dip only aound 3 to 4 GHZ,that to around -2.25 db.my center frequency is 2.5 GHz.what changes can i make to bring the return loss below -10 db.i have attached my design.
 

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The excitation port should be inside the airbox if you are using a lumped port; if you are using a waveport, it should be on the edge of the airbox. It should never be outside the airbox.
 
PlanarMetamaterials said:
The excitation port should be inside the airbox if you are using a lumped port; if you are using a waveport, it should be on the edge of the airbox. It should never be outside the airbox.
Click to expand...

Thakyou sir .i am designing a cavity backed bowtie antenna .i am using lumped port.whether the feed should be within the cavity box or out of cavity box.or at the edge .
 

PlanarMetamaterials said:
The excitation port should be inside the airbox if you are using a lumped port; if you are using a waveport, it should be on the edge of the airbox. It should never be outside the airbox.
Click to expand...

hi, you mean both wave port and air box can overlap (i.e they can share the same plane)?
 

priyarajan said:
Thakyou sir .i am designing a cavity backed bowtie antenna .i am using lumped port.whether the feed should be within the cavity box or out of cavity box.or at the edge .
Click to expand...

Whichever is most realistic in your case.

- - - Updated - - -

sandeepkiranv said:
hi, you mean both wave port and air box can overlap (i.e they can share the same plane)?
Click to expand...


Yes, that is correct.
 

PlanarMetamaterials said:
Whichever is most realistic in your case.

- - - Updated - - -

i have a small doubt reg cpw feed, can u clarify in which direction the integration line should be taken in the case of cpw feed(standard), i believe it should be directed from central conductor strip to the one of the side conductors am i right ?
Click to expand...
 

sandeepkiranv said:
i have a small doubt reg cpw feed, can u clarify in which direction the integration line should be taken in the case of cpw feed(standard), i believe it should be directed from central conductor strip to the one of the side conductors am i right ?
Click to expand...

That should be correct.
 

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