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Spring 2011

ECE 6345. Spring 2011. Prof. David R. Jackson ECE Dept. Notes 14. Overview. In this set of notes we derive a CAD formula for the space-wave Q factor ( Q sp ) of the rectangular patch, using the previously-derived formula for the space-wave radiated power. CAD Formula for Q sp.

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Spring 2011

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  1. ECE 6345 Spring 2011 Prof. David R. Jackson ECE Dept. Notes 14

  2. Overview In this set of notes we derive a CAD formula for the space-wave Q factor (Qsp) of the rectangular patch, using the previously-derived formula for the space-wave radiated power.

  3. CAD Formula for Qsp Recall We have, from Notes 12, (The origin is at the center of the patch.) Where it is assumed that

  4. CAD Formula for Qsp (cont.) To calculate the stored magnetic energy, use The stored magnetic energy is then

  5. CAD Formula for Qsp (cont.) Hence Simplify, using or so

  6. CAD Formula for Qsp (cont.) and This eliminates k0 and 0 and leaves only the patch dimensions. The result is or

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