Abstract
We have experimentally studied emission of microwave radiation from a monopole source embedded in a three-dimensional photonic crystal. We have demonstrated enhancement of microwave radiation at the band edge and cavity mode frequencies. Furthermore, we have shown that it is possible to obtain highly directive microwave radiation sources operating at the band edge of the three-dimensional photonic crystal. We have measured half power beam widths of 13 degrees for both E and H planes, corresponding to a maximum directivity of 245.
Highlights
We have studied emission of radiation from a monopole source embedded inside a 3 dimensional (3D) Photonic crystals (PCs) in order to get an enhancement of radiation and to confine emitted power to a narrow angular region in two planes (E and H planes)
Enhancement factor is defined as the ratio of the intensity of the EM waves emitted from a source located inside the PC to the intensity of the EM waves emitted from a source in free space
Our results show that 3D PCs can be used to enhance the emitted power from a monopole source
Summary
Group velocity is inversely proportional to the delay time. Enhancement factor is defined as the ratio of the intensity of the EM waves emitted from a source located inside the PC to the intensity of the EM waves emitted from a source in free space. We have measured the transmission properties and the delay time of the PC along the stacking direction. The experimental setup for the transmission measurements consisted of an HP 8510C network analyzer and two standard gain horn antennas to measure the transmission amplitude and phase. Electromagnetic radiation was incident upon the sample along the stacking direction from the source horn antenna. Both the source-to-PC distance and receiver-to-PC distance are 10 cm for the transmission measurements.
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