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An efficient surface integral equation solution is presented to the problem of electromagnetic scattering from chiral material coated conducting object above a lossy half space. By using the surface equivalence principle and the Bohren decomposition scheme, the electric-magnetic current combined-field integral equation (JMCFIE) combined with the combined-field integral equation (CFIE) is developed...
A marching-on-in-degree (MOD) solution of the time-domain combined field integral equation (TD-CFIE) with Nystrom scheme is proposed to analyze transient electromagnetic scattering from arbitrarily shaped perfect electrically conducting (PEC) objects. In this scheme, the Lagrange interpolation polynomials and weighted Laguerre polynomials are used to represent the spatial and temporal basis functions,...
In this paper, a novel substrate integrated waveguide (SIW) horn antenna with detached broad-walls is designed and analyzed. The detachment of the broad walls makes the field transition from TE10 mode in the SIW to surface wave mode in the substrate without metal walls and thus significantly improves the impedance matching. Moreover, the substrate with graded dielectric constants is realized through...
An analytical approach for the synthesis of an asymmetric dual-band bandpass filter with a frequency-invariant arbitrary load is proposed. Based on numerical approximation technique and exchange-Remez algorithm, one can design a symmetric or asymmetric frequency response beside two passband. Different equiripple characteristic and orders can be achieved in each passband. Under the definition of power...
A compact wideband bandpass filter is presented in this paper. By loading the short-ended parallel-coupled-line-stub (PCLS) at the center of the uniform-impedance half-wavelength line, the tri-mode resonator is realized. Two transmission zeros, due to the PCLS, are generated at the lower and upper cut-off frequencies and sharp selectivity can be obtained. The short-ended PCLS resonator is theoretically...
A kind of wideband differential bandpass filters on the multimode slotline resonator has been proposed. In virtue of the hybrid microstrip/slotline structures, the common mode (CM) signals can be intrinsically rejected in the topology. Multiple modes of the slotline resonator are excited to construct the wideband passband in differential-mode (DM). Further, a novel design method has been deduced based...
Some emerging applications of R-ASP require the radio systems to adapt to dynamic environments. This cannot be achieved using phasers with fixed group delay profiles. Therefore, we introduce here a gain-loss loaded C-section phaser featuring real-time tunability, or reconfigurability, in group delay. This phaser exhibits an all-pass response all the way across its tuning range thanks to a paired and...
It is known that nonlinear inversion algorithms have good accuracy in inverting electromagnetic data. However, their applications are still limited by their computational complexity. In this paper, we study an acceleration scheme for the two-dimensional multiplicative regularized contrast source inversion (MR-CSI) algorithm using compute unified device architecture (CUDA) and NVIDIA general purpose...
In this paper, a compact bandpass cross-coupled substrate integrated waveguide (SIW) filter with transmission zero is proposed. Using three triangular cavities as basic elements, a bandpass filter is designed and fabricated on a single-layer substrate with the standard printed circuit boards (PCB) process. This structure gives full expression to the advantages of compact SIW triangular cavity. Not...
Monte Carlo Methods are non-deterministic simulation methods. In this paper, a Markov Chain Monte Carlo method (MCMC) is presented to solve the Helmholtz equation. Different from other types of Monte Carlo methods, the MCMC method can give the whole field distribution after one matrix operation. The method is investigated and applied to solve one- and two-dimensional electromagnetic wave problems.
This paper proposes a novel dual-band dual linear-polarization reflectarray design. The reflectarray consists of two different types of elements: cross-dipole element for Ka band, and modified phoenix square loop for W band operation. An advantage of the antenna is that both types of elements are aligned and printed on a single layer of substrate. And a group strategy for unit choice is presented...
Efficient and accurate behavioral modeling of nonlinear memory effects are, nowadays, an integral part of the design process of modern communication systems. Notably, the nonlinear long-term memory effects occurring in solid state devices downgrade considerably system performances in presence of modulation signals. This paper presents an improved behavioral model for Solid State Power Amplifiers (SSPAs)...
The tapered line theory in circuit can be applied to the design of the special-shaped monopole antenna in order to obtain better electrical characteristics. So the circular disc monopole antenna is optimum designed and a novel Klopfenstein taper monopole antenna is proposed. The impedance matching characteristic of the Klopfenstein tapered line is the best, and the Klopfenstein taper monopole antenna...
As a spatial filter, frequency selective surface (FSS) has been intensively investigated for many years. The applications of FSS are always needed to be conformal. So modeling and analysis conformal FSS (CFSS) is particularly important. In this paper, three projection methods for modeling the doubly-curved frequency selective surfaces (DCFSS) are investigated. We compare the different effects of these...
In this contribution, we explore the application of the recently proposed nested equivalence source approximation method to the MFIE operator. We find the radial direction of the equivalence source should be removed to obtain better precision. The impedance matrix approximation precision is tested in detail. Error-controllable approximation of the MFIE operator is the key to extend the NESA to homogenous...
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