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XuQing
Joined: 19 Feb 2004
Posts: 50
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 15 Sep 2004 10:41 can share your experiences in basestation antenna design |
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Hi ALL,
I design a 5-elements dipole antenna array for basestationantenna use. But the VSWR is not as good as simulation results from HFSS. Can anyone share your experiences in BSA design ?
Best Regard,
XuQing[/b]
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15 Sep 2004 10:41 Ads |
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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15 Sep 2004 11:03 can share your experiences in basestation antenna design |
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| Maybe I can help. Can you provide more info on what you are doing?
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XuQing
Joined: 19 Feb 2004
Posts: 50
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20 Sep 2004 2:58 Re: can share your experiences in basestation antenna design |
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djalli,
I use air-filled microstrip-line to feed signal and coupling to diple with a gap. Results from HFSS9.0 as follows.
Simulation: VSWR <1.3
Test: VSWR(max) =1.65
I'm not sure what's the most reasons.
1) due to HFSS errors
2) due to machining
3) due to design method
4) else
How do you think about this problem?
thank you!
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flatulent
Joined: 19 Jul 2002
Posts: 4877
Helped: 324
Location: Middle Earth
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20 Sep 2004 3:03 Re: can share your experiences in basestation antenna design |
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| It could be your air filled transmission line. Is the method of supporting the conductor above the ground plane included in your simulation? Another thing to do is get the input impedance real and imaginary part in both simulation and measurements. This will give you more clues than a single number (SWR) parameter.
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XuQing
Joined: 19 Feb 2004
Posts: 50
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20 Sep 2004 10:38 Re: can share your experiences in basestation antenna design |
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flatulent,
Yes, I included the dielectric supporting in my simulation. But test is not in an anechoic chamber. Is that important in SWR testing?
Another case is I must enlarge the arm of dipole 20mm long than simulation data to get a tradeoff return-loss response.
Some wrong happens in simulation?
thank you!
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