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On the reflectarray using ring-type resonator elements, a high efficiency design method was adopted and its results were confirmed at the design frequency. In this paper, in addition to the conventional high efficiency design method, a reflectarray was designed and measured by considering the broadband conditions. As a result, the aperture efficiency of the fabricated reflectarray was more than 65%...
The two elements array antenna composed of inverted L antennas printed on the two-layer dielectric substrate and excited by the microstrip line through the slot is proposed and numerically analyzed. The size of the antenna is 0.24 λ by 1.25 λ by 0.0352 λ. The S 11 less than −10 dB is satisfied from 23.96 GHz to 24.06 GHz, and gain is 3.63 dB at frequency of 24 GHz. In the numerical analysis, the electromagnetic...
Authors have proposed a printed inverted-F antenna (PIFA) for circular polarization. In this paper, an approach to improve the bandwidth is investigated. It is shown that the bandwidth can be widened by designing the rectangular element loaded at the feeding line as short as possible. The redesigned PIFA in this paper has approximately twice (210MHz) the bandwidth of the 3dB-axial ratio with a 10dB-return...
In this paper, the bandwidth enhancement of monopole printed antenna backed with metasurface is presented. The proposed antenna which is intended to work at frequency of 2.3MHz consists of a rectangular patch on the top side and a metasurface on the other side. It is designed on an FR4 Epoxy dielectric substrate with the thickness of 0.8mm. To demonstrate the feature of bandwidth enhancement, a conventional...
This paper deals with the development of compact square-loop-resonator (SLR) bandpass filter (BPF) with cross-shaped input/output (I/O) coupling. The proposed filter is designed for X-band frequency application with the center frequency of 9GHz and the −3dB fractional bandwidth larger than 4%. It is deployed on a 1.9mm thick high permittivity RT/duroid® 6010.2LM dielectric substrate with the dimension...
In this paper, A novel stable gain printed log-periodic dipole antenna (PLPDA) with two slotted dielectric substrates, based on the substrate integrated waveguide (SIW) technologies is proposed. This antenna consists of a traditional PLPDA fed by SIW, which reduces dielectric loss and conductor loss and two pieces of Rodgers5880 substrates with periodic slots, two pieces of Rodgers5880 substrates...
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