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Showing papers in "Electromagnetics in 2017"


Journal ArticleDOI
TL;DR: In this article, a shared-aperture dual circularly-polarized Spidron fractal slot antenna is presented, which is fed by two individual excitation ports.
Abstract: A shared-aperture dual circularly-polarized Spidron fractal slot antenna is presented. The proposed antenna, which includes a Spidron fractal slot with an L-shaped slit and a cutting corner, is fed by two individual excitation ports. The left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) at the same operating frequency band are simultaneously achieved using the even and odd modes in a coplanar waveguide transmission line. The measured –10 dB reflection and 3 dB axial ratio (AR) bandwidths are 20.24% and 8.0% for LHCP and 10.09% and 9.15% for RHCP. An average isolation of about –19.84 dB is obtained between the two ports within the overlapped bandwidth (–10 dB reflection and 3 dB AR bandwidths). The measured peak gains of the proposed antenna for LHCP and RHCP are 5.41 dBic and 3.39 dBic, respectively.

11 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the use of mode-free electromagnetic bandgap materials, a novel bandgap-antenna structure, to eliminate scan blindness from two-dimensional infinite microstrip phased arrays.
Abstract: This article discusses the investigation of the use of mode-free electromagnetic bandgap materials, a novel bandgap-antenna structure, to eliminate scan blindness from two-dimensional infinite microstrip phased arrays. This electromagnetic bandgap material is multi-functional; in addition to suppressing both surface and leaky waves, it also radiates to broadside direction as an antenna element within the mode-free bandgap region. A strip line impedance matching network is used to match the bandgap-antenna element’s input impedance to 50 Ω, so that the actual bandgap behavior of the structure on the array can be obtained since the strip line does not allow couplings within the matching network. In addition, internal couplings within the unit element of the bandgap-antenna structure, which is composed of four metallic layers, are analyzed in detail; these internal couplings vary with array element’s excitation phase or scan angles, therefore, an optimum structure must consider scan behavior as well.

10 citations


Journal ArticleDOI
TL;DR: In this paper, a hybrid iterative solver for modeling composite rough surface electromagnetic scattering is proposed, based on a kind of divisional rough surface with the shape of a round water zone embedding.
Abstract: This article proposes a hybrid iterative solver for modeling composite rough surface electromagnetic scattering. First, a kind of divisional rough surface with the shape of a round water zone embed...

10 citations


Journal ArticleDOI
TL;DR: In this article, a closed-form approach to compute the attenuation of electromagnetic waves propagating in lossy circular and rectangular waveguides is presented, which describes a set of characteristic equations, which describe the wave attenuation.
Abstract: A closed-form approach to compute the attenuation of electromagnetic waves propagating in lossy circular and rectangular waveguides is presented. A set of characteristic equations, which describes ...

10 citations


Journal ArticleDOI
TL;DR: In this paper, a compact wideband Bi-Cone shaped Dielectric Resonator Antenna (BCDRA) is proposed, which is formed by joining two conical sections from base to base.
Abstract: A compact wideband Bi-Cone shaped Dielectric Resonator Antenna (BCDRA) is proposed. The Bi-Cone geometry is formed by joining two conical sections from base to base. This aids to increase the Surface area to Volume ratio(S/V). Thus the impedance bandwidth of DRA is increased. To further miniaturize the Bi-Cone DRA triangular notches and edge grounding is incorporated. The proposed DRA prototype is fabricated and measured. The measured results shows an impedance bandwidth range from 2.8 to 7.38GHz (93.1%) for (<-10dB). Moreover, the miniaturized Bi-Cone DRA has a volume of 7.58, which is 74% less than the volume of the base structure.

8 citations


Journal ArticleDOI
TL;DR: In this article, an ultra wideband (UWB) bandpass filter for the rejection of wireless local area network and satellite communication signals is proposed, which is composed of an open stubs loaded ring resonator.
Abstract: As the ultra-wideband system is easy to be interfered by narrow-band signals, an Ultra-wideband (UWB) bandpass filter for the rejection of wireless local area network and satellite communication signals is proposed. The main resonant structure was composed of an open stubs loaded ring resonator. The cascaded open stubs increased a resonant frequency and improved the selectivity of the filter. Two notch bands were realized by coupling W-shaped short stub loaded resonators and etching complementary split rings resonators. The notch frequencies could be obtained by adjusting the size of two band-stop resonators. The UWB bandpass filter was then simulated, fabricated, and tested. Simulation results are in sound agreement with measured results. Both show that the filter has a compact size with a wide upper stopband, and dual notch bands are centered at 5.8 and 8.0 GHz, respectively, which suppressed the interference from a wireless local area network and satellite communication signals in the UWB passband.

8 citations


Journal ArticleDOI
Wei Hu1, Jianjun Wu1, Zhaoyang Tang1, Peng Fei, Yingzeng Yin1 
TL;DR: In this article, a single-feed crossed dipole antenna with bent-slot loading is proposed for broadband and unidirectional circular polarization operations, which is composed of two orthogonal dipoles with kite-shaped arms.
Abstract: A novel single-feed crossed dipole antenna with bent-slot loading is proposed for broadband and unidirectional circular polarization operations. This antenna, with a simple structure, is composed of two orthogonal dipoles with kite-shaped arms. To achieve broadband circularly polarized characteristic, two capacitive bent slots are loaded into one pair of crossed dipole arms to realize a 90° phase difference between the dipoles. Moreover, a modified coupling feeding technique is employed to increase the impedance bandwidth. Experimental results show the proposed antenna has a 10-dB impedance bandwidth of 62.6% (1.47–2.81 GHz) and a 3-dB axial ratio bandwidth of 37.0% (1.85–2.69 GHz). Besides symmetrical radiation patterns, desirable antenna gains around 9 dBic over the wide operating bandwidth are also demonstrated.

7 citations


Journal ArticleDOI
TL;DR: In this article, every space component is modeled by a small number of electric dipoles based on the measurement of the magnitude of the electric field at novel set of near-field positions.
Abstract: Prediction of the electric emissions in space missions is critical due to the sensitivity of their payload. A reliable method to predict such emissions is the accurate electric source identification. In this work, every space component is modeled by a small number of electric dipoles based on the measurement of the magnitude of the electric field at novel set of near-field positions. The location and electric moment are accurately predicted via stochastic algorithms resulting in the correct reconstruction of the source’s electric field both at measurement and extrapolation points.

5 citations


Journal ArticleDOI
TL;DR: In this article, a two-dimensional dielectric loss model with an unsteady temperature distribution inside the asphalt mixtures to obtain the temperature field when the asphalt mixture is heated by a horn antenna is established.
Abstract: The proposed functional equation is established using a two-dimensional dielectric loss model with an unsteady temperature distribution inside the asphalt mixtures to obtain the temperature field when the asphalt mixture is heated by a horn antenna. Furthermore, the boundary conditions are built. The stiffness matrix of overall temperatures is obtained by the discretization of the solution region. The temperature value of each node can be obtained by solving the stiffness matrix. The temperature distribution is achieved in the direction of the electric and magnetic fields by using the -spline function to fit each node temperature. Results show that the temperature gradient in the direction of the electric field is smaller than that in the direction of the magnetic field. The maximum temperature occurs near the center of the horn surface. The simulation and experiment results are consistent, which are significant in solving the stiffness matrix of the overall asphalt mixture temperature.

5 citations


Journal ArticleDOI
TL;DR: In this paper, a compact broadband composite right/left handed transmission line (CRLH-TL) bandstop filter based on a triple path signal interference mechanism is presented, where the slotline is etched on the ground plane below the interdigital capacitor to improve both the in-band and out-of-band performance.
Abstract: A compact broadband composite right/left handed transmission line (CRLH-TL) bandstop filter based on a triple path signal interference mechanism is presented. The filter incorporates CRLH-TLs, conventional transmission line, and the slotline to implement a compact design. The CRLH-TL is used to realize negative phase shift. The meandered slotline is etched on the ground plane below the interdigital capacitor, which can improve both the in-band and out-of-band performance. The proposed filter avoids the 270/360 degree transmission line in conventional signal interference designs. The equivalent-circuit method is employed to analyze the presented bandstop filter. A broadband bandstop filter centered at 2.45 GHz is designed and fabricated. Good performance is obtained in the stopband as well as in the passband. Calculated, simulated, and measured results show good agreements with each other. The total size of the fabricated bandstop filter is 0.21λg × 0.11λg.

5 citations


Journal ArticleDOI
TL;DR: In this paper, a simple single-layer substrate integrated waveguide diplexer is proposed in which a dual mode cavity is used as a junction, and a square substrate integrated cavity with cor...
Abstract: In this article, a simple single-layer substrate integrated waveguide diplexer is proposed in which a dual mode cavity is used as a junction. A square substrate integrated waveguide cavity with cor...

Journal ArticleDOI
TL;DR: Two novel compact quasi-planar four-way high isolation power dividers are presented and the power divider with compensating capacitance demonstrates a great improvement of isolation performance and output impedance matching.
Abstract: Two novel compact quasi-planar four-way high isolation power dividers are presented in this paper. The two-layer coplanar waveguide–microstrip transition structure is used to imply the isolation circuit. The equivalent circuit is given to analyze the proposed power divider. To further improve the isolation performance and output impedance matching, the capacitance compensation technology is analyzed and used to design the power divider. The measured results of the two four-way power dividers (without and with the compensating capacitance) agree with the simulated ones closely. The measured results indicate that the proposed power dividers have a low insertion loss, excellent impedance matching at all ports, good amplitude and phase balance at the output ports, and high isolation among the output ports. Moreover, the power divider with compensating capacitance demonstrates a great improvement of isolation performance and output impedance matching.

Journal ArticleDOI
TL;DR: In this paper, a multilayer T-septum structure and its application to a substrate integrated waveguide filter is presented, where the coupling mechanisms in a T-SEPTum structure, including stacking vertical layer and adjacent common sidewall, are discussed in detail.
Abstract: A multilayer T-septum structure and its application to a substrate integrated waveguide filter are presented. Coupling mechanisms in a T-septum structure, including stacking vertical layer and adjacent common sidewall, are discussed in detail. The T-septum resonance cavity exhibits not only excellent parasitic response characteristics, but also features of a miniature structure. The proposed filter with fourth-order T-septum resonators has two transmission zeros, which can be adjusted flexibly by controlling the coupling strength and manner. With the assistance of the low temperature co-fired ceramic multilayer structure and refined coupling structure, the proposed filter has a more compact size while maintaining high selectivity. A demonstration filter is designed, fabricated, and measured to validate the proposed structure. Measured results are provided showing good performance and agreement with the simulated examples.

Journal ArticleDOI
TL;DR: In this article, a dual-segment 4-element linear broadside rectangular dielectric resonator antenna array with copper sheet on one side is introduced to excite the antenna array to achieve high gain and appreciable bandwidth together with low cross polarization.
Abstract: In this article, the theoretical, simulation, and experimental study of high gain dual segment 4-element linear broadside rectangular dielectric resonator antenna array shaping the -field components with copper sheet on one side, has been carried out. Copper strip connected to microstripline is introduced to excite the proposed dielectric resonator antenna array to achieve the coupling for dielectric resonator material with lower dielectric constant (≤10). Proposed antenna array with copper strip excitation has been successfully fabricated and tested. The voltage standing wave ratio, gain, and radiation characteristics of the proposed array have been explored using Ansoft HFSS 15.0 simulation software. Antenna array is also investigated using the finite-difference time-domain numerical technique. Good agreement between the simulated, calculated, and measured results is obtained. High gain and appreciable bandwidth together with low cross polarization is always defiance for researchers. The gain of...

Journal ArticleDOI
TL;DR: In this paper, a wideband near-zero-index metamaterial (NZIM) unit cell, for gain improvement of a broadband microstrip fractal patch antenna is proposed and designed.
Abstract: In this article, a wideband near-zero-index metamaterial (NZIM) unit cell, for gain improvement of a broadband microstrip fractal patch antenna is proposed and designed. The near-zero refractive index characteristics of metamaterial superstrate is used, which gathers the radiated waves from the source antenna and collimates them toward the normal direction. The reference fractal patch antenna operates at a relatively wide frequency range covering from 2.38 to 3.61 GHz, corresponding to a 40% fractional bandwidth. In order to effectively enhance the broadside gain of the antenna, a proposed unit cell is optimized using invasive weed optimization (IWO) algorithm to have the widest bandwidth at the required frequency band, in which the refractive index is less than unity (approaches zero). A prototype of the antenna was fabricated and tested. Measured results are in good agreement with the simulation. The measured −10 dB relative impedance bandwidth for the loaded antenna with NZIM is found to be 31%...

Journal ArticleDOI
TL;DR: A planar microstrip circuit to design a dual-band balanced-to-unbalanced out-of-phase power divider with inherent impedance transformation with excellent conversion inhibition between the differential-mode signals and the common-mode noise.
Abstract: A planar microstrip circuit is proposed in this article to design a dual-band balanced-to-unbalanced out-of-phase power divider with inherent impedance transformation. This balanced-to-unbalanced power divider, which essentially consists of two pairs of cascaded coupled lines, two dual-band 90° phase shifters, and a grounded resistor, features the dual-band application with inherent impedance transformation, the equal power division with out of phase, high isolation between two outputs, good ports (A, 3, and 4) matching, and high common-mode noise suppression as well as the excellent conversion inhibition between the differential-mode signals and the common-mode noise. The closed-form solutions are obtained by using the traditional odd- and even-mode analytical methods. Finally, a practical microstrip balanced-to-unbalanced power divider, which operates at 0.9 GHz and 1.8 GHz, is designed and fabricated. The simulated and measured results verify the correctness of the circuit and the design theory.

Journal ArticleDOI
TL;DR: In this paper, a generalized hybrid scheme combining finite element method (FEM) and the method of moments (MOM) is presented to investigate scattering from a 3-D dielectric object above a 2-D rough surface.
Abstract: ABSTRACT A generalized hybrid scheme combining finite element method (FEM) and the method of moments (MOM) is first presented to investigate scattering from a 3-D dielectric object above a 2-D dielectric rough surface. The hybrid FEM/MOM scheme is divided into the FEM region for the object based on Helmholtz’s equation and the MOM region for the rough surface based on coupled integral function, which can greatly reduce the computed region. With the rough surface getting larger, the unknowns of the rough surface get more. So MLFMA is employed to reduce computation complexity of MOM region itself and coupling interaction matrices between MOM region and FEM region. Consequently, the iterative process can be greatly accelerated. This generalized hybrid FEM/MOM is very suitable for investigating scattering from composite model of a complex material object and electrically large dielectric rough surface. Some examples verify this generalized hybrid FEM/MOM in high efficiency, low storage requirement, high precision and generality.

Journal ArticleDOI
TL;DR: In this article, the authors present the implementation of the rigorous method of analytical regularization for the scattering of an H-polarized plane wave by the classical airfoil described by the Zhukovski tranform.
Abstract: This article presents the implementation of the rigorous method of analytical regularization for the scattering of an H-polarized plane wave by the classical airfoil described by the Zhukovski tran...

Journal ArticleDOI
TL;DR: In this article, a compact power divider integrated filtering response with high isolation and high frequency selectivity is presented, which can be viewed as an integration of a second-order dual-mode bandpass filter and the quasi-Wilkinson power dividers.
Abstract: A compact power divider integrated filtering response with high isolation and high frequency selectivity is presented in this article. The four short-circuited-loaded quarter-wavelength resonators are employed to construct the presented compact power divider. The presented divider can be viewed as an integration of a second-order dual-mode bandpass filter and the quasi-Wilkinson power divider. In order to improve the frequency selectivity of passband, the cross-coupling circuits between input port and output ports are used. A power divider with bandpass-filtering response is designed, fabricated, and measured. The operating central frequency of the fabricated power divider is at 2.43 GHz. The measured 3-dB insertion loss bandwidth is about 180 MHz and the measured minimum insertion loss is about 0.85 dB. The measured isolation between the output ports is around 30 dB.

Journal ArticleDOI
TL;DR: In this article, a dual-band rejection filter using multilayered stepped impedance loaded-resonator (SILR) is proposed, which is composed of two circuits patterned on three layers using two substrates.
Abstract: A new compact dual-band rejection filter using multilayered stepped impedance loaded-resonator (SILR) is proposed in this article. The stepped impedance loaded-resonator is a dual-mode resonator. The filter structure is compose of two circuits patterned on three layers using two substrates. On the bottom double layer substrate, two SILRs are designed and coupled to generate and control the bandwidths of the first and second bandstops. To achieve the frequency response of the desired filter, a signal path transmission line is realized on a top single layer substrate and vertically coupled to the bottom substrate circuit. To validate the developed approach, a dual-band rejection filter is designed and fabricated to reject the frequencies of 2.4 GHz WLAN and 3.5 GHz WiMax systems. The simulated and measured responses are in good agreement. The resulted filter offers small size, good isolation passband and high selectivity performance with favourite transmission poles around the desired rejection bands.

Journal ArticleDOI
TL;DR: In this paper, a novel broadband end-fire circularly polarized antenna is presented, which comprises a diamond-shaped shorted parallel-plate cavity (DSPC) and planar symmetrical conductor arms (PSCA).
Abstract: In this article, a novel broadband end-fire circularly polarized antenna is presented. It comprises a diamond-shaped shorted parallel-plate cavity (DSPC) and planar symmetrical conductor arms (PSCA). The DSPC and PSCA serve as the electric and magnetic dipole, respectively. By adjusting the aperture of DSPC and bending angle of PSCA, the impedance bandwidth and the axial-ratio bandwidth are greatly improved. Meanwhile, the end-fire circles are employed to improve the gain of an antenna. The overall size of the antenna is 35.5 mm × 38.2 mm × 2 mm, equal to 0.98 λ0 × 1.05 λ0 × 0.055 λ0. The measured results show that the realized impedance bandwidth for S11 ≤ –10 dB is 14.1% (7.63–8.79 GHz) and 3-dB AR bandwidth is 16.4% (7.57–8.92 GHz). A good agreement between the simulated and measured results is obtained.

Journal ArticleDOI
TL;DR: In this article, a controlled reception pattern antenna (CRPA) array with a single-layer coupled feed structure is proposed to improve the radiation gain and a matching bandwidth, where each array element consists of a feeding patch and an outer radiating loop printed on a thick ceramic substrate with a high dielectric constant.
Abstract: This article proposes the design of a controlled reception pattern antenna (CRPA) array with a single-layer coupled feed structure to improve the radiation gain and a matching bandwidth. Each array element consists of a feeding patch and an outer radiating loop printed on a thick ceramic substrate with a high dielectric constant. The loop is capacitively coupled to the patch and the coupling strength is adjusted by varying the gap distance. Antenna characteristics are measured in a full anechoic chamber, and an equivalent circuit is built to verify the operating principle. The results demonstrate that the proposed structure is more suitable to enhance the gain and bandwidth compared to a conventional patch antenna in small CRPA arrays.

Journal ArticleDOI
TL;DR: In this article, a sub ANN-based model is proposed to capture the frequency-dependent effect of the resistance, inductance, conductance, and capacitance (RLGC) model up to sub-THz region, promising a compact and wideband modeling approach.
Abstract: Microstrip line, coplanar waveguide, ground coplanar waveguide, and two kinds of slow-wave transmission lines (T-Line) are designed and realized based on a 0.13 μm Complementary Metal-Oxide-Semiconductor (CMOS) process. The radiation loss in the sub-THz region is evaluated by E-field distribution and attenuation coefficient versus the dimensions. Characterizations of these T-Lines up to sub-THz region is performed by sub artificial neural network (ANN) based on T-Line models and measurement results. The sub ANN-based model is capable of capturing the frequency-dependent effect of the resistance, inductance, conductance, and capacitance (RLGC) model up to sub-THz region, promising a compact and wideband modeling approach. The effect of dummy-filling on degrade of T-Lines performance in sub-THz region is also analyzed and evaluated by measurement and simulation results. Good agreement is obtained between the simulation, modeling, and measurement results.

Journal ArticleDOI
TL;DR: In this article, a complex source point can generate a beam field, which is employed to expand an arbitrary source via a complex extension of the surface equivalence principle, and then the complex source beam expansion method is applied to analyze the field of large reflector antennas via physical optics method.
Abstract: The physical optics method is a widely used radiation and scattering estimation for electrically large-scaled objects, and it is finally reduced to the calculation of highly oscillatory integrals. In this article, the physical optics integrals over the reflecting surface for an incident complex source point is evaluated here in closed form. A complex source point can generate a beam field, which is employed to expand an arbitrary source via a complex extension of the surface equivalence principle. Then the complex source beam expansion method is applied to analyze the field of large reflector antennas via physical optics method. Numerical examples are presented to illustrate the accuracy and efficiency of this complex source beam-physical optics hybrid method for analyzing general parabolic reflectors.

Journal ArticleDOI
TL;DR: In this paper, the authors developed a feasible hybrid electromagnetic scheme to evaluate the composite scattering and the Synthetic Aperture Radar (SAR) image characteristics of a low altitude perfect electr...
Abstract: This article has developed a feasible hybrid electromagnetic scheme to evaluate the composite scattering and the Synthetic Aperture Radar(SAR) image characteristics of a low altitude perfect electr...

Journal ArticleDOI
TL;DR: In this paper, a wideband corrugated conjugate matched feed horn was designed to cancel the high unwanted cross-polar components generated in offset reflector geometry having very low F/D and high offset angle.
Abstract: This article presents the design of a wideband corrugated conjugate matched feed horn to cancel the high unwanted cross-polar components generated in offset reflector geometry having very low F/D and high offset angle. A new kind of symmetrical cascaded discontinuities is used in circular waveguide at the throat section of the horn for wideband operation of corrugated conjugate matched feed. The feed horn is specifically designed to mitigate the cross-polarization generated in 90° offset reflector antenna system with F/D = 0.7 and 0.4. The secondary radiation patterns have been computed. Significant improvement in the cross polarization is achieved at 55–60 GHz frequency band.

Journal ArticleDOI
TL;DR: In this paper, a four-way X-band slotted-substrate integrated waveguide (SIW) power divider using an identical slot-coupling structure has been proposed.
Abstract: A novel four-way X-band slotted-substrate integrated waveguide (SIW) power divider using an identical slot-coupling structure has been proposed in this article. The proposed power divider was realized by using an identical transition between a resonant slotted SIW and output microstrip lines, and four identical rectangular coupling slots were employed to achieve good impedance matching and equal signal transmission. The proposed power divider is designed, fabricated, and measured. The measured results show a reasonable agreement with the simulated ones and the advantages of its low profile, efficient heat sinking, as well as its potential for high power-combining efficiency.

Journal ArticleDOI
TL;DR: In this article, a single-layer circular polarization antenna for flexible dual-frequency-band ratio adjustment is proposed, which consists of an inner circular patch and an outer ring patch that is electromagnetically coupled to the circular patch.
Abstract: This article proposes the design of a single-layer circular polarization antenna for flexible dual-frequency-band ratio adjustment. The antenna consists of an inner circular patch and an outer ring patch that is electromagnetically coupled to the circular patch. The circular patch is fed by two ports of a hybrid chip coupler, and the dual-frequency-band ratio is adjusted by varying the gap distance between the two patches. For verification, the proposed antenna was fabricated to measure its antenna characteristics in a full anechoic chamber, and the results demonstrated that the antenna is suitable for flexible adjustment of the dual-frequency-band ratio from 1.24 to 1.8, with an average axial ratio of 2.4 dB.

Journal ArticleDOI
TL;DR: In this article, a dual-band circularly polarized four-arm Spidron fractal antenna is proposed for Ku-band satellite communication, which is realized using two-crossed dipole antennas of different lengths.
Abstract: A dual-band circularly polarized four-arm Spidron fractal antenna is proposed for Ku-band satellite communication. The dual-band characteristic is realized using two-crossed dipole antennas of different lengths. Each dipole arm includes a Spidron fractal patch to generate circular polarization and a printed meander-line to reduce the size. The proposed antenna is fed by a 50- coaxial cable, and a conducting cavity is utilized to obtain a directional circularly polarized radiation pattern. The experiments demonstrate that the fabricated antenna exhibits −10 dB reflection bandwidths ranging from 10.75 GHz to 12.65 GHz and from 13.33 GHz to more than 15 GHz with a broad 3 dB axial ratio bandwidth covering a frequency range of 10.66–14.46 GHz. The measured peak gains are 8.76 dBic in the lower band and 7.43 dBic in the upper band.

Journal ArticleDOI
TL;DR: In this paper, a novel FDTD called R-SO-ADI FDTD is proposed, which is based on the shift operator technique and reduces the storage of the field components through combining the reduced formulation technique and the ADI scheme.
Abstract: ABSTRACT In order to analyze the electromagnetic characteristics of plasma more efficiently, a novel FDTD called R-SO-ADI FDTD is proposed. The proposed method which is based on the shift operator technique has clear conceptions and simple formulae, and it saves CPU time and reduces the storage of the field components through combining the reduced formulation technique and the ADI scheme. Calculation results of the RCS of a perfectly conducting cylinder coated by plasma confirm the validity of the proposed method.