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.
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].
The main objective of this study is to optimize an optical component considered as an essential building block in wavelength division multiplexing applications. The work presented here focuses on the design of an optimum 1 × 8 compact splitter based on a two-dimensional (2-D) photonic crystal (PhC) in triangular unit cells exhibiting high transmission. It generates a contribution to the 2-D planar PhCs in the integrated optics field. These new materials may prohibit the propagation of light in certain directions and energies. We also optimize the splitter topologies in order to integrate them in optoelectronic systems as division components. To do so, the 2-D finite-difference time-domain method is employed to characterize the transmission properties. Simulation results show that total transmissions of about 86%, 78%, and 86% for the 1 × 2, 1 × 4, and 1 × 8 Y splitters, respectively, at output ports are obtained around the wavelength 1.55 μm widely used in optical telecommunications. It is demonstrated numerically that the corresponding total insertion losses for the three splitters are, respectively, about 0.65, 1.08, and 0.65 dB. The simulation results are presented and discussed. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/18/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 067104-2 June 2015 • Vol. 54(6) Badaoui and Abri: Optimized 1 × 8 compact splitter based on photonic crystal. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/18/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 067104-4 June 2015 • Vol. 54(6) Badaoui and Abri: Optimized 1 × 8 compact splitter based on photonic crystal. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/18/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 067104-6 June 2015 • Vol. 54(6) Badaoui and Abri: Optimized 1 × 8 compact splitter based on photonic crystal. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/18/2015 Terms of Use: http://spiedl.org/terms
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.
Abstract-During the last decade, selective photonic crystal filters have received much research interest in the fields of nanotechnology and optical interconnection network. The main focus of this paper consists of an analysis and a synthesis of one-dimensional photonic crystal selective filters. The optimization is performed by employing the simulated annealing algorithm. The filters synthesis is obtained by acting on the Bragg grating layer widths. Simulated annealing is applied to solve the PhC-1D filters synthesis problem in order to reduce the quadratic error and to obtain a desired transmission according to a Gaussian function defined in advance by the user. Starting from the Maxwell's equations for dielectric nonmagnetic structure, we show the derivation of the Helmholtz equation and find its solution for 1D layered structure. In addition, the boundary conditions and equation transformation to set of linear equations which are solved using Cramer's method are described thoroughly. This mathematical technique is then applied for computation of the transmission spectra of 1D perfectly periodic structure and structures with different defects. These results can be easily applied for design of selective filters.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.