i.e., the field is zero at the center and is maximum at theedge; the fields are oppositely directed at he @ = 0 and'#J = 180' locations on the edge, where '#J = 0 is identifiedwith the feed point. By contrast, the static mode has a fieldwhich is uniform throughout the patch. In order to rejectthis mode and other higher order modes, and to retain theabove TMlo mode, a shorting pin is usually placed at thecenter of the circular patch. If a match to 50 a is desired,(51) can be used in conjunction with Fig. 25 to calculatethe location of the feed point.
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