Accurately measure flammable gases by Holkom B.

By Holkom B.

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In this structure a coupling slot is cut in the cylindrical ground plane and placed under the patch. This slot-coupling feed mechanism thus involves two substrates separated by a ground plane, one for the microstrip patch and another for the feed line. One can choose a low-permittivity substrate for the microstrip patch to increase its radiation efficiency, and on the other hand, select a high-permittivity substrate for the microstrip feed line to reduce its feed-energy loss. The electromagnetic energy is then coupled from the feed line to the microstrip patch through the coupling slot.

3. (a) Real part of complex resonant frequency; (b) imaginary part of complex resonant frequency. (From Ref. 019 z! 3. (a) Real part of complex resonant frequency; (b) imaginary part of complex resonant frequency. The planar results are obtained from 121. (From Ref. ) CYLINDRICAL RECTANGULAR MICROSTRIP PATCH WITH A SUPERSTRATE 29 where c is the speed of light. It is observed that both the real and imaginary resonant frequencies can reach convergent solutions for both the sinusoidal basis functions with N 12 and M 12.

Since the microstrip patch is a resonant structure, the inverse of the quality factor also represents the half-power operating bandwidth for the microstrip patch as a radiator. 3 Complex Resonant Frequency Results To obtain full-wave solutions of complex resonant frequencies of the superstrateloaded cylindrical rectangular microstrip patch, numerical convergence of the moment-method calculation incorporating the sinusoidal basis functions with and without edge singularity is first studied. The fundamental mode TM,, (to the p direction) is considered; that is, the patch is excited in the direction along with the cylinder axis.

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