2*1 patch array - how to design the feed network ?

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

01 Jul 2009 10:36 Re: 2*1 patch array

i am simulating a 2*1 patch array but in my results i am seeing a lot of harmonics the patch's are designed to resonate at 10 GHz can anyone plz look into this design and help me solve my problam

Added after 50 seconds:

here the hfss file

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

01 Jul 2009 22:59 Re: 2*1 patch array

i have designed the feed network seprately can any one please guide me how to design the feed network effectly on hfss and what paramters to improve and optimum vlaues urgently

shameemkabir

Joined: 31 Oct 2007
Posts: 389
Helped: 113
Location: Germany

02 Jul 2009 12:48 Re: 2*1 patch array

does your single patch antenna work as expected?

leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

02 Jul 2009 18:08 Re: 2*1 patch array

yes it does i have s11 at -21db and vswr 1.12

shameemkabir

Joined: 31 Oct 2007
Posts: 389
Helped: 113
Location: Germany

03 Jul 2009 10:57 Re: 2*1 patch array

I simulated one patch from your uploaded file. However, it does not have the characteristics you told (10 GHz resonance, S11 at -21db and vswr 1.12).

would you please upload your single patch?

leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

03 Jul 2009 18:18 Re: 2*1 patch array

sory i just checked my uploaded file again it had been changed since i was chaing parameters to fru to figure out where i was going wrong in this attachment i have uploaded both array and single patch

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

05 Jul 2009 14:33 Re: 2*1 patch array

can anyone please sugest anything on patch array :S

shameemkabir

Joined: 31 Oct 2007
Posts: 389
Helped: 113
Location: Germany

06 Jul 2009 9:51 Re: 2*1 patch array

The single patch simulation does not give a useable design at 10 GHz. this is the return loss what I have found. Is it the same what you have got?

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

06 Jul 2009 11:58 Re: 2*1 patch array

these are my simulation results

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

09 Jul 2009 13:50 Re: 2*1 patch array

what should be the distance between the patches i have read it should be 0.5*lamda to 0.8 lamda also i read it should be no greater than 8* substrate height how can i find optimum distance