This article consists of the design of single band bandpass filter, multiband bandpass filter, and multiband bandstop filter based on a substrate integrated waveguide technique. First, proposed structure of single band bandpass filter has been designed with the combination of inductive and capacitive metallic posts at 14.8 GHz center frequency of Ku band application. Moreover, the tuning scheme for frequency has been also demonstrated for the same band. Similar concept has been applied for the design of multiband bandpass filter keeping distance between posts as a function of guided wavelength. In addition to above, multiband bandstop filter has been proposed by providing E‐plane discontinuities with the use of the metallic edge (by putting multiple cylinder posts). The effect of position of the metallic edge on the performance has been observed and analyzed. All the proposed structures have been simulated by Ansoft High frequency structural simulator and its equivalent models by Ansoft system designer (which compared and shows its performance parameters are equal and they are sensitive to parameter variations). © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1409–1417, 2015

This article represents microstrip low-pass filter using defected ground structure (DGS) for the wireless communication application. DGS is used as the basic building block for the realisation of a low-pass filter. A low-Pass filter with a 23 dB cutoff frequency of 3.5 GHz has been designed and simulated using high frequency structure simulator. Tuning of frequency is carried out by changing the dimension of DGS. An equivalent LC circuit of proposed structure is derived and simulated it with advanced design system software. Proposed low-pass filter has been fabricated and provides better performance with compact size; it can be used in wireless communication application such as PCS-1900, UMTS, Bluetooth, WLAN, Wi-max, IMS, and RFID etc. V C 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:993-996, 2017; View this article online at wileyonlinelibrary.com.ABSTRACT: The aim of this work is to design a low-profile Circularly Polarized Dielectric Resonator Antenna for the X-band frequency applications. With optimized design the proposed Cylindrical DRA (CDRA) fed by off-centered L shaped slot is showing characteristics of Circular Polarization in the proposed band. Two orthogonal arms of off-centered L shaped slot having different dimension excite the two TM 01d modes at 9.5 and 10.5 GHz, in addition both slots itself produce resonances nearly at 8.6 GHz. Combination of all these resonances is generating the nature of circular polarization near 9.5 GHz. Parametric study on designed antenna has been done in order to determine the effect of design parameters on the circular polarization. Axial Ratio bandwidth of 10.5% (1 GHz) and impedance bandwidth of 25% (2.3 GHz) at 9.5 GHz has been shown for single and simple feed low-profile CDRA. Prototype of optimized design has been fabricated for the validation and measured results have shown good agreement with simulated ones.

Scaffolds for tissue engineering are support structures that help cells grow and multiply after being implanted into a patient. To allow cellular adhesion, proliferation, and differentiation, the optimal scaffolds should have the right surface chemistry and microstructures. Furthermore, the scaffolds must have sufficient mechanical strength and a low rate of biodegradation with no unwanted by-products. Regenerative medicine efforts currently rely on the transplantation of cells in combination with supporting scaffolds and macromolecules to restore pathologically damaged tissue architectures. Biologically active scaffolds, which are based on analogues of the extracellular matrix that have spurred tissue and organ creation, have attracted a lot of attention in recent years. A scaffold is required to restore function or regenerate tissue, as it will serve as a temporary matrix for cell proliferation and extracellular matrix deposition, with further ingrowth until the tissues are completely restored or regenerated. Different technologies have been employed for fabrication of scaffolds for regeneration of different organs and tissues like skin, cartilage, bone, heart, lungs, liver and kidney. This review focuses on the different strategies used to construct the scaffold for the above-mentioned tissues and organs along with their commercial applications. Keywords: Tissue Engineering, Scaffold, Electrospinning, Nanofiber, Heart valve, Kidney Decellularization

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This paper represents design of Substrate integrated waveguide (SIW) based bandpass filters for the centre frequency of 22.5 GHz and 23.5 GHz for communication between two satellites. A proposed filter has been designed for the transceiver used in communication linking and ranging between two satellites. However, the allotted band for satellites communication is 22.5-23.5GHz so that we have to design very narrowband bandpass filter which isolated two frequencies having bandwidth less than 170 MHz and quality factor is more than 100. Simulation of the proposed structures have been carried out by Ansoft high frequency structural simulator (HFSS) and it shows that the proposed structures having bandwidth is 1l0MHz and quality factor is 203 which reasonable for isolation. An equivalent LC circuit has been derived of the proposed structure and it is verified by the advanced designing system (ADS)