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desin of patch antenna

 
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mona111
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PostPosted: Sat Mar 06, 2010 11:53 pm    Post subject: desin of patch antenna Reply with quote

how can I calculate the width of the transmission line (wf) for the line feeding of the microstrip patch antenna ; I mean what its design equation.
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admin
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PostPosted: Mon Mar 08, 2010 8:29 am    Post subject: Reply with quote

You can try using the calculator on this page as an approximation:
http://chemandy.com/calculators/microstrip_transmission_line_calculator_Hartley27.htm

In general it is a function of t, the width of the line, the dielectric constant....

For a circuit board, t and the dielectric are fixed, so you can get the result you want by changing the width of the line (W). Increasing W lowers the characteristic impedance Z0.

Typically receivers have an impedance of 50 Ohms, and so if the antenna is designed to be 50 Ohms, the characteristic impedance you should be trying to obtain is 50 Ohms.
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mona111
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PostPosted: Tue Mar 16, 2010 11:39 pm    Post subject: Reply with quote

thanks alot for ur replay and the important links
but i ask about the width of the line feeding(wf)?is this what u named (W) at ur design sketch and the equation ? or this is the width of the patch antenna itself ?
thanks alot
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PostPosted: Wed Mar 17, 2010 4:29 am    Post subject: Reply with quote

In the reply I was talking about the width of the transmission line. If you increase the width, the impedance decreases.

The impedance of the patch antenna also decreases with width.
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