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We demonstrated the diaphragm type PZT oscillator performance through simulation experiments. To achieve the desired frequency, firstly, the size of a diaphragm and a thickness of PZT and Si layers are optimized. Then, we select three different PZT/Si models. Finally, we analyze the models transmission efficiency, receiving sensitivity (piezoelectric voltage / electric charge) and frequency bandwidth...
For CNSS applications, this letter presents a square patch antenna loaded with a pair of wrench-shaped tuning rings on the diagonal position. The loaded tuning ring, which can apparently enhance the bandwidth and gain of the proposed antenna by adjusting orthogonal radiation arrays, consists of a triangle corner cut, a rectangular arm slot and a C-shaped groove. The simulation of the designed antenna...
In this paper microstrip antenna with different defected ground structures are compared on the basis of their bandwidth, gain and radiation properties. It is observed that these antennas can operate in ultra wide band frequency range with different notches. Comparison of these antenna structures reveals that these antennas show multiple band operation with different number of pass bands and bandwidths...
This paper is about new class of band-pass Frequency Selective Surface (FSS) that works at X-band. For this purpose, two structures are presented. First structure same as traditional FSS uses aperture element and can control bandwidth with changing lengths. For single layer resonant frequency is located at 9.86GHz and the range of −3dB bandwidth is between 7.44 to 12.42GHz (4.98GHz). In order to made...
Equivalent systems method was implemented for designing the resonator slow-wave structures in plasma-beam devices, and non-impact plasma was used for the filling of the transit channel. The collation of the calculation results demonstrates the adequacy of the developed model in comparison with the real devices and structures. The analysis of the slow-wave structure dispersion characteristics was carried...
The natural frequencies of the multimode microstrip resonator «hairpin with stub» were investigated from its constructive data. Application in the resonator of the stub allows not only to observe on amplitude-frequency characteristic the poles of power attenuation, and also to considerably reduce frequencies of all its even modes of oscillations. At the same time frequencies of odd modes don't change...
In this paper, a multilayer conical dielectric resonator antenna (DRA) excited by two coaxial cables has been investigated. The phase shift of the two coaxial cables with 90° creates a circular polarization of the radiated electromagnetic wave. The proposed structure provides a bandwidth of about 41% with a gain ranging from 4.8 dB to 8.7 dB in the bandwidth. The simulation study of the proposed antenna...
We demonstrate an ultra-short cavity 1.5-μm single-mode directly-modulated VCSELs with record modulation bandwidth of 22 GHz at room temperature operation.
This paper studies how deforming the shape of a patch antenna affects its characteristic modes by applying the characteristic modes theory to analyze EM fields in antenna designs. The resonant frequencies of the lowest modes are in special focus in order to excite several modes in as small a space as possible.
The radiation characteristics of a dipole antenna when immersed in both fresh and seawater are assessed through simulation and experimental work. Simulations show that the antenna's bandwidth and radiation pattern change with the properties of the medium where it is placed, namely the conductivity of the medium. Two dipoles antennas with current baluns were built and tested experimentally in freshwater...
This manuscript represents the two half circular gap coupled disk patch antenna stacked with D.G.S. (Defected Ground Structure) for dual-wideband application. The antenna has an overall size of 40.0×40.0×1.6mm3 and gives the results of dual band performance. The proposed antenna can be used in military communication, wideband global satellite communication systems (WGS) (9.43–10.08 GHz) and in Airport...
The present work investigates a novel cylindrical dielectric resonator antenna (CDRA) excited by a coaxial feed monopole, which is mounted on a circular substrate with a deformed ground plane. A vertical electric monopole is placed in the center of the DR. The wideband characteristic is achieved by the deformed ground plane. The features of the proposed antenna meet the essential requirements of X-band...
This paper presents the design of tri-band planar dipole antenna for PCS and WLAN services. A modification is made in the previously presented dipole antenna design [1]. The configuration of the proposed dipole antenna is given in Figure 1(a). The antenna design consists of a printed dipole and two parasitic elements which are behaving as resonators by coupling from the driving element. The proposed...
This paper presents the effect of dimensions, spacing, periodicity and shapes of Reactive Impedance Surface (RIS) elements on resonating frequency of a suspended 2 × 2 MSA antenna array designed on a RIS loaded FR4 substrate. RIS consists of 13 × 13 square patch array with each patch of side 4mm and 1mm inter-element spacing. Elements of MSA array are fed through a feed line network which is fed by...
In this work, a novel bi-layered metamaterial structure composed of a ring-chain structure and metal sheet-backed is proposed, which can realize ultra-broadband reflected polarization conversion in the near-infrared spectral region. Numerical results reveal that the structure possesses the ability to convert x-polarized and y-polarized waves to their orthogonal direction in frequency range from 109...
In this paper, sierpinski-shaped dipoles are introduced in a printed log-periodic dipole antenna design. A Log Periodic Sierpinski Antenna (LPSA) is developed and the characteristics studied. Antenna size is considerably reduced, still maintaining the overall performance characteristics. The results are compared with that of a standard printed LPDA. A set of shapes of LPSA are studied and the observations...
In this paper, a novel analogue tunable bandpass filter with constant absolute bandwidth is presented. The filter is designed based on full wavelength microstrip open ring resonators loaded with varactors. Magnetic dominated mixed coupling is designed to make the coupling coefficient meet the requirement of constant absolute bandwidth response. The filter is designed, fabricated and measured. The...
We propose the design and simulation of a dual-band reflective polarization converter in the microwave region based on multiple resonances. An ultra-thin broadband polarization conversion composing of arrays of electric-field-coupled (ELC) resonator, a dielectric layer and a continuous metallic layer is further demonstrated numerically. The proposed converter can rotate the linearly polarized (LP)...
The defected-ground-structure (DGS) resonator is an important topic of design of the front-end circuit in the wireless communication systems. By etching a patterned slot in the ground plane, it can excite band-stop frequency performance [1, 2]. Generally, the conventional DGS resonator with two shorted ends and its resonated path in its fundamental mode is half a wavelength long at the operated frequency...
Electromagnetic band gap (EBG) is widely used to suppress the transportation of simultaneous switching noise (SSN) in circuit. But the periodic High impedance planes of EBG destroy the return path of signal line. That phenomenon leads serious problem of signal integrity, which makes the research of EBG more important. In this paper, a new structure of EBG with multi-via and double-layer structure...
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