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A kind of low sidelobe and high gain microstrip antenna array with 32×8 units operating in the X-band is designed, which achieves the gain of 28 dBi and the sidelobe level of −25 dB at 9.37 GHz. The Chebeshev distribution is used in designing the current distribution on the surface of this antenna, which achieves a width of main lobe of 5° in E-plane and a main lobe width of 10° in H-plane. The amplitude...
A reconfigurable Yagi-Uda with the liquid metal is proposed in this article. By a new electrochemical method for reversible, we control the length of liquid eutectic gallium indium (EGaIn) in the capillary. Electrochemical deposition (or explode) of a surface-oxide on the EGaIn significantly lowers (or increases) its tension to induce the liquid metal up (or down) of the capillary. The three-element...
In order to achieve a ultra-wideband operating characteristics. A low profile dual-band absorbing structure is proposed, the two-dimensional periodic array double ring printed on a dielectric substrate, and insert the chip resistors in four symmetrical positions on the circumference of the ring. The RCS of the two-dimensional array of finite element simulation, the influence of the various parameters...
A printed parabolic antenna is proposed in this paper. The antenna is loaded with a parabolic cylinder reflector which is composed of a series of metal-via arrays in order to improve the gain of H-plane horn antenna based on substrate integrated waveguide (SIW). The final simulation results by CST Microwave Studio indicate that this antenna has the effect of high gain, the reflection coefficient of...
A kind of broadband and high gain printed Yagi antenna with complex parabolic boundary reflector is proposed. This kind of antenna has low profile, wide bandwidth and high gain, as well as simple feeding and so on. The commercial simulation software, CST Microwave Studio® has been used to analyze the surface current on the metal radiator of antenna. The model of dipole array, which is equal with the...
High peak power lasers are of great importance for a wide number of applications like material processing, remote sensing and etc. The most impressive, and still record, result has been demonstrated with using of photonics crystal fibers (PCFs), where amplification to more than 1 MW peak power directly from amplifier was demonstrated [1, 2]. However such fiber are difficult in production, handling...
Mobile communication between two moving objects is interesting because of its application in military and navigation. Cassegrain antenna, which is high gain and narrow beam, is the most common construction in mobile communication. To reduce the difficulty of position due to narrow beam, an FSS is proposed to obtain wide beam at some frequencies. The disk sub-reflector is used to decrease the axial...
A novel balanced antipodal Vivaldi antenna (BAVA) with asymmetric substrate cut-out and tapered slot edge (TSE) is designed to be used as a sensor for a MMW imaging system. Research on these novel features is demonstrated to enhance the gain by an average of 2dB over a band of 10–40GHz and greatly reduce the beam-tilting at E plane, which is considered to be the major defect of conventional BAVA....
In this paper, a low-profile vertical polarized omnidirectional radiated and broadband printed antenna was proposed. This antenna forms a transmission lines structure similar with parallel lines by using metal vias and coaxial feed inner conductor. Then the distributed inductances and capacitances of transmission lines are used to yield resonance with loaded capacitance of antenna itself. Therefore,...
The simplicity and intuitive design of traditional planar printed quasi-Yagi antennas has led to its widespread popularity for its good directivity. In this paper, a planar printed Quasi-Yagi antenna with 3 directors and 1 concave parabolic reflector, operating in S-band, is proposed. The impedance and radiation characteristic are simulated with CST-Microwave Studio, and the antenna is fabricated...
Cassegrain antenna operating at millimeter-wave band is an attractive and low-cost choice for communication in moving and mono-pulse tracking system. In this paper, the design method of Cassegrain antenna, geometrical optics, is introduced. To miniaturize the axial dimension of the Cassegrain antenna, a disk which is low cost and easily produced, is proposed to replace the sub-reflector with the shape...
This paper presented the design of a linear polarized antenna module for bioradar sensors using microstrip arrays. This antenna module was designed operating at 77GHz for remote contactless evaluation of human vial signals. This antenna module consisted of a series of vertically aligned linear arrays. Each of the linear array was formed by 10 micro patches connected by quarter-wave impedance transformers...
In this paper, a new millimeter-wave transmitting/receiving antenna module for bioradar sensors was proposed. This antenna was designed operating at 24 GHz for remote contactless evaluation of the human organism adaptation to physical and mental stress. This module was divided into two parts, both of which were implemented by a microstrip array antenna sub-module. The feed networks were also optimized...
The paper describes an approach of indoor multiple moving target detection and tracking using Ultra Wide-band(UWB) signals. The approach utilizes estimating the time of arrival(TOA) of the UWB pulses through a linear antenna array, providing a real-time computation of moving targets position in X-Y plane. The results of the proposed approach show a reliable and responsive performance in monitoring...
One of the critical technologies is the combination of superconductivity and semiconductor technologies on the one substrate. The use of the JJ in self-pumping mode regime as one of the heterodyne detection method can design a new modern self-pumped THz receiver with tunable frequency at all THz band. Theoretical analysis and simulation for the terahertz tunable self-pumped receiver based on RSJ model...
One of the critical technologies is combining both of superconductive and semiconductor technologies on a single substrate, including creating Josephson junction (JJ) near the gate of a semiconductor transistor. The use of JJ in self-pumping mode regime as one of the heterodyne detection methods can provide a new trend for designing modern passive terahertz imaging system. Further development will...
On the basis of previous theoretical and experimental investigation, here we propose the design of a super wide panoramic receiver-frequencymeter (PRF) based on the Josephson junctions (JJ). This solution is particularly suitable for experimental purposes rearding new generation structures for which radiative power is small and operating frequency is not accurately known. In particular, we present...
A Josephson junction (JJ) can be conveniently used in modern passive terahertz imaging system. JJ can be presented and described as the noise heterodyne in pixels based on the receiver consisting of JJ mixer in self-pumping regime connected with intermediate frequency amplifier. This study presents the theoretical basis and calculations of the possible sensitivity in the radiometric regime. Further...
Based on previous theoretical and experimental investigations, possibilities of using Josephson junctions (JJs) to realize a new type of wideband frequency meter integrated with panoramic receiver (PRF) in terahertz band in a single unit were described in this paper. The suggested device can be particularly valuable for experimental purposes in terahertz band, where available equipment for frequency-domain...
In this paper, a new millimeter-wave transmit/receive antenna module for radar sensors was proposed. This antenna was designed operating at 24 GHz and intended for obstacle detection and short-range automotive applications. The transmitting part was implemented by a microstrip array antenna with 48-elements and improved with the concern of nonhomogeneous weights for amplitudes excitation. The receiving...
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