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Most compact FD-FD stencils for discretizing 3-D homogeneous Helmholtz equation suffers from so-called numerical dispersion due to inadequate spatial sampling of the EM field. To verify the effectiveness of newly-derived compact local spherical Fourier-Bessel series (LSFBS) -based formulae, including local field expansion (LFE) face-centered LFE-FC-7, edge-centered LFE-EC-13, corner-point LFE-CR-9,...
In this paper, a reconfigurable filter based on quarter-mode substrate integrated waveguide (QMSIW) resonator is proposed. QMSIW is employed to reduce the size of the filter, and the filter can be tuned with the varactors loaded on the QMSIW. QMSIW resonator with a single varator loaded is studied and a two order filter is designed and simulated. The simulated results show that the work frequency...
Composite electromagnetic scattering from a three-dimensional (3-D) perfectly electrically conducting (PEC) target partially buried in a two-dimensional (2-D) random rough surface is investigated in this paper. The random rough surface is represented using Gaussian correlation function, and generated by the spectral method. An accurate composite geometry modeling method is used, which is based on...
In this paper, we proposed a novel miniaturized waveguide bandpass filter, which filled with anisotropic uniaxial meta-material with transversal negative effective permeability. The theoretical analysis is presented. A sample using the W-band standard waveguide to operate at Ka-band is simulated. From the simulation, it can be concluded that the filter has large band rejection and high selectivity...
Through the test of field intensity, power and the S21 of reverberation chamber, the Q value and the independent sampling points with absorbing material loaded in different positions are calculated in this paper, and the result show that as the loading position varies the parameters of reverberation chamber mentioned above differ. And this paper presents the method of using network analyzer and electro-optical...
A Bi-iteration model is proposed to accurately solve the composite electromagnetic (EM) scattering problem of a three-dimensional (3-D) geometrically arbitrary object above a two-dimensional (2-D) rough surface. Two iteration processes are involved in this model. Iterative physical optics (IPO) which calculates the EM scattering from the rough surface is named as inner iteration. While for the EM...
Conformal finite-difference time-domain (CFDTD) is used for solving frequency selective surface in this paper. This approach is easy to implement and is numerically stable. Some models are simulated to demonstrate the accuracy and fast computation time of CFDTD. Two common FSS structures are calculated, one is a cut-wire on the dielectric layer while another is a cross on the dielectric layer. The...
A miniaturized branch-line coupler is achieved by using the unit cells of novel center-symmetrical spiral-interdigital resonator (CSSIR) in this article. Due to its intrinsic convoluted structure, CSSIR can be completely embedded in the microstrip line, and a compact transversal dimension is realized. The electromagnetic characteristics of CSSIR are analyzed by Ansoft Designer and equivalent circuit...
Electromagnetic topology method is used to compute the inner electromagnetic field. In the first, it is established the topological interaction sequence diagram between external excitation source and internal electronic system through multiapertures. Then, the corresponding multistep iterative algorithm of apertures coupling is obtained. Finally, the CRIPTE software is used to calculate the electromagnetic...
For the first time, a broadband differential phase shifter with harmonic suppression is proposed. The proposed structure is not only used to provide a constant differential phase shift over the desired wide bandwidth, but also have a significant harmonic band rejection at the same time. Design formulas for the structure are derived using a systematic analytic technique. The optimal design parameters...
A passive self-interference cancellation network (SICN) is proposed in this paper. The network is composed of three directional couplers and microstrip delay lines. By adjusting the coupling factor of the two parallel coupled line directional couplers and the length of the delay lines, the proposed SICN is able to produce an optimized reference signal with approximate equal amplitude and 180° phase...
Laser technology becomes the preferred way in the fabrication of grounding holes of interdigital bandpass filter on the Al2O3 substrates. The relative position errors of grounding holes are unavoidable because of serial processing of drilling holes. The performances of interdigital bandpass filters with grounding holes of 0.25mm diameter and relative position errors of 0.02mm in the longitudinal or...
An improved W-band four-way power divider/combiner using turnstile coupling waveguide has been proposed in this paper. This divider/ combiner possess properties of low loss, high power capacity, compact structure, good return loss, and good heat dissipation. The 3D EM simulation results show that, from 85GHz to 100GHz, the return loss is better than 22dB and the transmission coefficient is about −6dB,...
According to the filtering characteristic of the grounded middle stub E-shape microstrip structure, a compact fourth-order UWB bandpass filter working within 2–8GHz is developed. Using an equivalent for this structure, the filter is designed by cascading three E-shape microstrip structures using short sections of the microstrip line in order to achieve more easily simulation. The filter is compact...
A new method to design multi-band filters is proposed by inserting electric and magnetic resonances to increase the selectivity of the lower and upper edge of the passband. A dual-band filter composed of regular hexagon cascaded complementary split rings resonator pairs (RH-CCSRRP) and regular hexagon cascaded complementary ring resonator (RH-CRR) are designed. Simultaneously, the proposed filter...
In this paper, a wide-band power divider utilized stripline to slotline transition is presented. The power divider uses two different transmission lines— stripline and slotline. The slotline was etched on the ground plane at an angle of 90 degree with the stripline. An improved open/ short end structures were employed to achieve the wide-band performance. The simulated results show that the proposed...
A novel X-band substrate integrated waveguide (SIW) differential bandpass filter (BPF) is proposed in this paper. The major design concept is by making an aperture etched in the middle common ground of vertically stacked cavities so that the common-mode signals can be suppressed. Oversized SIW cavities are implemented to achieve a finite transmission zero by utilizing the interaction between the fundamental...
This paper introduces a novel wide stopband microstrip bandpass filter working at 2 GHz. Stepped-impedance quarter-wavelength resonators are used here to reduce the size of the filter. Mixed electric and magnetic coupling between the resonators are adopted to introduce two transmission zeros on each side of the passband. Thus, the selectivity of the filter is improved. Also, due to the cancellation...
In the paper, the distributed voltage and current on the transmission lines are calculated first by the maxwell's equations combining with HFSS. Then the distributed capacitances and inductances are extracted by substituting the distributed voltage and current into traditional transmission line equations. Finally, the differences of voltage, current and circuit parameters of the three kinds of chamfered...
For miniaturization and multi-band application in modern microwave and wireless communication system, this article proposed a miniaturized triple-band quarter-wave open-circuit stub based on the simplified dual-composite right/left-handed transmission line (S-D-CRLH-TL) for the first time. The proposed S-D-CRLH-TL has been analyzed by the full wave simulator, and the simulated results prove that there...
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