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How to increase bandwidth in dual-band antenna??

How to increase bandwidth in dual-band antenna??

How to increase bandwidth in dual-band antenna??

(OP)
Hi all,


   I design dual-band microstrip antenna using the formula of Freq=light speed / 4( length+width) for both lower and higher operating freq. There is a U-shaped slot on the radiating element........

   However, it seems that the higher freq one always has a narrower bandwidth.......narrower than the lower freq one. So I want to find out what method can do improvement on its bandwidth for the higher operating freq?????

RE: How to increase bandwidth in dual-band antenna??

What kind of feed system do You use? Maybe it is possible to improve bandwidth by making better feed circuit.

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