Abstract-In this paper, a rigorous and accurate numerical two-dimensional modeling finite element method 2D-FEM is applied to the analysis and design of substrate integrated waveguide components. The finite element method represents an excellent tool for the analysis and design since it easily allows taking into account all details of each device. The advantages of this method have been proved with the successful design of two SIW waveguide topologies operating in [8][9][10][11][12] GHz and [10.7-12.75] GHz respectively for X-band and Ku-band applications employed in satellite communications. In order to validate the proposed method, a comparison is made between the FEM method implemented in Matlab and CST Microwave Studio

This paper presents the numerical and experimental results of a miniaturized half-mode substrate integrated waveguide HMSIW C-band pass filter with defected ground structure DGS, using two slots and dumbbell shape defected ground structure. These two slots which are etched on the upper plane of the SIW cavity are used to constitute a multiplemode resonator, and the dumbbell-shape fractal DGS etched on the bottom plane can considerably enhance the filter's performances. The manufactured band-pass filter in half mode based on SIW technology has a size nearly half of that of a normal filter. The measurements results obtained by CST in C-band show that the manufactured filter has a large transmitted bandwidth of about 1.53 GHz from 5.97 to 7.5 GHz. The higher measured insertion is about −2.6 dB and the lower return loss measured is about −34 dB. The size of filter design achieved is 7.48 × 38.12 mm 2 which make it the more compact in comparison with some published works at the C-band frequency.

We present new designs of waveguide components in photonic crystal structures used for routing light exhibiting high transmission. In particular, we focus on the design of a brick that will form the PhCs network, i.e., a double bends and Yshaped splitter. Photonic crystals are considered a good way for realizing compact optical bends and splitters. The PhC consists of a triangular array of holes etched into InP/GaInAsP/InP heterostructure. Propagation characteristics of the proposed devices are analyzed utilizing two-dimensional finite difference time domain (FDTD) method. The FDTD simulations confirm their unprecedented efficiency and robustness with respect to wavelength and structural perturbations. The PhCs transmission properties are then presented and discussed. Numerical results show that a total transmission of about 75% at output ports is obtained.

A new type of leaky-wave antenna (LWA) using half-mode substrate integrated waveguide (HMSIW) as the base structure is proposed in this paper. The structure consists of an array of slot, antenna designed to operate in X band applications from 8 to 12 GHz. HMSIW preserves nearly all the advantages of SIW whereas its size is nearly reduced by half. The antenna radiates one main beam that can be steered from the backward to the forward direction by changing frequency. Keyword:Leaky wave antenna Half Mode substrate integrated Waveguide X-Band CST Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved.Corresponding Author: INTRODUCTIONSubstrate Integrated Waveguides (SIW) is used for transmission of Electromagnetic waves. They are planar structures belonging to the family of Substrate Integrated Circuits. Because of their planar nature, they can be fabricated on planar circuits like Printed Circuit Boards (PCB) and can be integrated with other planar transmission lines like microstrips. They retain the low loss property of their conventional metallic waveguides and are widely used as interconnection in high speed circuits, filters, directional couplers, antennas.The SIW consists of two linear metallic connected via dielectric substrate with a height of h. The electromagnetic fields within the SIW are confined by these metallic via arrays [1].A more compact guided wave structure called half-mode substrate integrated waveguide (HMSIW) has recently been proposed [2], [3], which preserves nearly all the advantages of SIW whereas its size is nearly reduced by half. The transverse slotted rectangular waveguide is a simple structure that works as a leaky-wave antenna having frequency beam-scanning capability, with an orthogonal polarization from the conventional travelling-wave slotted antenna. Because of the polarization, the transverse slotted rectangular waveguide can scan from near broadside to end fire if the waveguide is filled with a dielectric material [4].Due to their superior frequency-scanning capability and ease of feeding, leaky-wave antennas (LWAs) possess certain advantages over conventional antenna arrays. A high-gain LWA can be achieved by simply extending its physical length, which can result in a compact size especially in millimeter-wave applications. Furthermore, LWAs can be designed to exhibit both forward and backward beam steering by incorporating metamaterials into their unit cells [5], [6]. Nevertheless, the frequency-scanning capability of metamaterial-based LWAs is not suitable for more common fixed-frequency applications. Thus, there has been considerable interest in tunable scan angle LWAs [7].

This paper presents the results of an investigation of a new version of a leaky wave antenna that is based on a substrate integrated waveguide (SIW). The structure of SIW is composed of two rows of cylinders between metal plates; it can be easily produced by the standard method PCB" circuit" or LTCC method, the antenna is designed so that it can radiate in C-band. The direction of the main lobe of the antenna radiation pattern can be steered by changing the frequency in the band from backward direction to forward direction; the effect of increasing the number of slot arrays has also been analyzed to study the effect on radiation patterns. The numerical simulations have been performed using a commercial CST Microwave studio. KEY WORDSLeaky wave antenna, substrate integrated waveguide, slots, C-band, CST, moment's method.

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In this article, a novel compact structure with a compact size and low insertion loss half‐mode substrate integrated waveguide/high pass‐filter dedicated for microwave signal guiding and high signal filtering that screen transmit‐IEEE C‐band signals is optimized, fabricated, and measured. The measurements results of the S parameters are compared with those provided by the commercial software CST Microwave Studio. Agreements between measurements data and the CST software results were achieved. It numerically compares how the transmission in C‐band can be successfully achieved with HMSIW. The Half‐Mode SIW Waveguide/High Pass‐Filter design size achieved is 7.5 × 35 mm2. A size reduction of about 50% in comparison with a similar SIW Waveguide/High Pass‐Filter has been achieved. The measured insertion loss is below −2 dB while the return loss is less than 10 dB. It is attractive which can be used for the radio communication system applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:414–418, 2016

In this paper, integrated 2D photonic crystal narrow band filter design is achieved based on transmission spectra shift. The presented effective technique for the design of narrow band resonant filters obtained by one-missing-row and by choosing proper radii of air holes of the waveguide is proposed. The 2D photonic crystals are designed by utilizing cascaded waveguides with different radii of air holes. The results are presented for normal incident wave with TE polarizations with a narrow spectral bandwidth centered at λ = 1.55 μm. We also discuss the filtering process and its necessary modifications to achieve efficient filtering. A final synthesized filter topology is presented and a band from 1.53 μm to 1.57 μm around 1.55 μm is transmitted with a maximum transmission of about 77% with better performances is achieved.