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Abu Maria.
Antenna Theory Regular

Joined: 22 Jan 2011
Posts: 39

 Posted: Tue Apr 10, 2012 10:23 am    Post subject: I found this in Balanis... hello... Balanis said"... If W (larger) >L (longer) >h, the dominant mode is the TMx 001 whose resonant frequency is given by (V0/2W*sqrt( ع_r)) ..." chapter 14 /cavity model page 831. V0:is the speed of light infree-space ع_r:permitivity when i choose L=lambda/2 , and W>L , so resonant frequency of the dominant mode will be a function of the length L , because L=lambda/2 , and not fucntion of W (larger) ...What do you think? thank u very much
Abu Maria.
Antenna Theory Regular

Joined: 22 Jan 2011
Posts: 39

 Posted: Wed Apr 11, 2012 9:38 am    Post subject: I have done my best to forward the issue well, my English is a little weak...if there is something incomprehensible then let me know thank you
Abu Maria.
Antenna Theory Regular

Joined: 22 Jan 2011
Posts: 39

 Posted: Sun Apr 15, 2012 5:13 pm    Post subject: really, it escapes me!!! (exuse my english) in balanis chapter 14 , page 820 , and in example (14.1) he propose a patch antenna with (h=1,588 mm , ep_r=2,2 and fr=10GHz) he calcule the parameter of this antenna he found W(width) > L (longer) but he calcule L (longer) with forumulas (lambda/2) and no with width (W) !! can you explain me ? thank u
bigSteve
Antenna Wizard

Joined: 14 Mar 2009
Posts: 265

 Posted: Mon Apr 16, 2012 3:20 am    Post subject: Balanis uses the cavity model to understand the patch antenna radiation. I don't think it is very intuitive. Hence, I'm not interested in what Balanis' book says. If you can't explain something intuitively, you don't understand it. Think about it until you have your own explanation or read a different book.
Abu Maria.
Antenna Theory Regular

Joined: 22 Jan 2011
Posts: 39

 Posted: Tue Apr 17, 2012 8:03 am    Post subject: ok thank you very for this advice... f someone else can explain what was said Balanis because I begin to admit what big said about this book
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