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Slotted waveguide array antenna with no grating lobes is designed and performance is evaluated by simulation. Grating lobes are suppressed by shortening the slot spacing or the effective guided wavelength in the waveguide by using metamaterial technique. Effect to suppress the grating lobe is confirmed by simulation of radiation pattern.
In this paper, we adopted the EBG structure for the antenna substrate to achieve low profile antennas. The thin mushroom-like EBG substrates with narrow gaps were fabricated to limit the area size of the substrate to apply small equipments. The impedance and radiation pattern of a dipole antenna were measured when the antenna was closely located above the EBG substrate. It was confirmed that a dipole...
A proposed compact PIFA antenna with small dimension suitable for 4G handsets is presented. Overall volume of this antenna is significantly small with 0.741cm3 that makes it attractive for recent modern slim personal communication handhelds. This proposed antenna is attached with a varactor diode to archive tuning frequency property that makes antenna able to covering most popular frequency bands...
A printed reflectarray antenna consists of a feed and a planar array of microstrip patches. The performances of whole antenna system obviously depend on the radiation pattern of the feed. In order to enhance the aperture efficiency, a saddle-shaped pattern of the feed is required. In this paper, a one-dimensional (1-D) pattern synthesis for feed is performed by employing a coupled tapered slot-line...
In this paper, we proposed a Folded type Rectangular Loop Antenna (FRLA) for one-seg. The measurement and simulation results indicated that the characteristics of the radiation patterns are similar to a rectangular loop antenna with full wavelength wire and resonates in the lower UHF band. The measured gain of the FRLA is -2.8dBi and the simulated gain is -2.2dBi. In the future, we will study configurations...
The radiation pattern of an optimized Yagi-Uda antenna does not suffer from the minor radius alteration (such as 1/2: 50% reduction or 1/4: 75 % reduction) of elements even if the alteration is uniform for entire elements. The minor step-tapered design alteration in radius of radiating elements greatly affects the radiation characteristics of the Yagi-Uda antenna, which is originally designed with...
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