A conformal dielectric rod antenna array with operating frequency of 11.2 GHz is investigated, designed, and measured. This antenna array is combined with a single pole double throw radio frequency microelectromechanical systems (RF‐MEMS) switch to realize switched‐beam performance. Moreover, this antenna array exhibits uniform radiation performance for different scan angles with no grating lobes. The characterization and measurement of the antenna system have been performed. The measured radiation pattern of the antenna in the anechoic chamber is in good agreement with the simulated antenna pattern. The measured antenna with the RF‐MEMS switch has 13.5 dBi realized gain, −15 dB sidelobe level, 22° half‐power beamwidth, and 7.3% (fractional) bandwidth (or 800 MHz) at 11.2 GHz.
This paper studies the fundamental guided mode (HE11) in hollow core polymer fibers. The effect on the effective index of the inside radius, the outside radius and the frequency is studied. Two methods were used to verify this model. Firstly the effective wavelength is measured. The effective indices calculated from the measured effective wavelengths are compared with the model. Secondly the groupdelay is measured. This is then compared to the groupdelay derived from the model. Both approaches are in good agreement with the model.
An improved design of the patch antenna with the dielectric rod is proposed. The wideband branchline coupler and wideband patch antenna are designed and optimized to realize a high port-to-port isolation for the whole 60-GHz ISM frequency band. In this paper, the design of the improved dielectric rod antenna is explained. The achieved gain of the antenna system is around 13.5 dBi, and the antenna supports dual circular polarization for bi-directional communication while promotes rotational freedom. The achieved port-to-port isolation larger than 20 dB is obtained for the bandwidth of 7 GHz, which is a significant improvement from the author's previous design. The measured axial ratio in the bandwidth of interest is below 3 dB.
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