Published in Engineering Research Express
In this paper, we propose dual-band phase shifters based on the Inverted-E topology, which can be configured for independent phase shift values at the two design frequencies. The simple structure comprises of a 50 Ω Main Transmission Line (MTL), whose electrical length is proportional to the frequency, loaded with three equally spaced open circuite...
This paper presents a design of a superdirective array of 3 monopoles antennas with radiation pattern reconfigurable for Wi-Fi box in ISM band. It is principally based on Uzkov's theory, who define the possibility to obtain a high directivity in order of N 2 in a desired direction by linearly associating a large number of N radiators closely spaced...
Published in Semiconductor Science and Technology
We investigated the effect of inserting a compositionally graded layer at the GaAsBi/GaAs interface on the photovoltaic and light-emission properties of GaAs/GaAsBi pin diodes. When the pin diode is operated as a solar cell, inserting a graded layer improves the open-circuit bandgap–voltage offset (W oc) to 0.51 V. This is comparable to or better t...
In this paper, we present a method to design a switchable polarizer using p-in diodes. An antenna-filterantenna architecture with four metal layers (receiving and transmitting radiating elements, ground plane, and bias lines) is implemented to convert an impinging linearly-polarized electromagnetic wave to a circularly-polarized one. Furthermore, b...
The different effect of displacement damage produced by neutron irradiation on the static characteristics of 4.5-kV silicon and 4H silicon carbide (SiC) p-i-n power diodes is explained using deep level transient spectroscopy (DLTS), C–V profiling, and open-circuit voltage decay (OCVD) measurements. The number of introduced defects in SiC is higher,...
A novel single-feed ultrawideband cavity-backed slot antenna with a reconfigurable polarization capability is demonstrated in substrate-independent air-filled substrate integrated waveguide (AFSIW) technology for Internet-of-Things applications in the [5.15-5.85] GHz frequency band of the unlicensed national information infrastructure. The antenna ...
The effect of radiation damage on the minority carrier lifetime in the 4 H-SiC epilayers forming the n-base of the power p-i-n diodes is presented. Irradiation with fast neutrons and MeV protons is used for uniform and local lifetime reduction. Deep-level transient spectroscopy in combination with open-circuit voltage decay measurement shows that t...
In this paper, an optimization driven method for the synthesis of pattern reconfigurable parasitic antenna arrays is presented. The proposed approach allows the design of antennas fulfilling different performance requirements. Two test cases, aimed at optimizing the antenna directivity and front-to-back ratio, respectively, are presented.
In this paper, a technique to maximize the directivity of an antenna array is presented. It consists of a fed monopole and a loaded parasitic one. The nature and value of the load are obtained using the Uzkov equations that calculate the current weighting coefficients in the case of two separately fed antennas to maximize the gain and the directivi...
This letter presents an electronically reconfigurable, linearly polarized unit cell for transmitarray applications in Ka-band. A 1-bit phase resolution (namely with two phase states 0 ° and 180 °) is obtained using two p-i-n diodes mounted on a slot-loaded patch antenna. The design, realization, and experimental characterization in a standard waveg...
