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A novel compact chipless RFID tag with multiple bit encoding using Stepped Impedance Resonator (SIR) is proposed. Unique code of the tag is encrypted in the frequency spectrum by incorporating variations in magnitude of the scattered field. Fundamental mode and first harmonics of the SIR is effectively utilized to represent the data. Two bit information can be represented by one SIR, therefore the...
A circularly polarized slot antenna for bluetooth applications is proposed in this paper. The rectangular slot is excited by a coplanar waveguide feed terminated on a hexagonal patch. The measured impedance bandwidth is from 1.6 GHz to 3.0 GHz while the measured axial ratio is from 2.00 GHz to 2.65 GHz. The antenna has a peak gain around 3–4 dBi in the operating band. The radiation patterns are omnidirectional...
In this paper, a new technique is proposed for obtaining two-dimensional microwave image of the illuminated medium in order to detect concealed objects. The required image is obtained by scanning the medium under test (MUT) in the two-dimensional plane under the assumption that the MUT is illuminated with a plane wave and the scattering parameters are measured at all sampling locations. The resultant...
A novel optoelectronic oscillator (OED) circuit using self-injection locked phase-locked loop (SILPLL) technique is reported for high frequency stable ultra-low phase noise signal source applications.
A novel microwave coplanar sensor system for detecting contamination in food products such as milk and oil etc., is designed and developed. The developed system is fully non-invasive and non-destructive, which requires the test liquid to be filled into a disposable container. The sensor placed above the liquid filled container is connected to the network analyzer through appropriate RF connectors...
In this paper, an optically controlled band gap reconfigurable structure using photo-induced periodic stubs along a microstrip line is presented. Photo-induced stubs are created by illuminating a microstrip line with small laser spots. Theoretical model of the photo-induced lossy stubs is developed and the frequency response of the periodic structure is computed.
A microstrip transmission line of half wavelength loaded with a radial stub operates as a dual mode resonator. By controlling the dimensions of the radial stub it is possible to control the nature of coupling between two modes. By controlling the coupling between the resonator and source/load, it is possible to realize transmission zero with a single dual mode resonator. It is also possible to locate...
In this paper we discuss the effects of domain patterned magnetic shielding, using Permalloy, on Spiral Inductors employed in CMOS RFICs. Ferromagnetic Resonance of the domain patterned Permalloy is not observed in the measured frequency range of 1 GHz to 5.5 GHz and an improvement in Inductance and Quality factor of Spiral Inductor is noticed.
In this paper two-dimensional microwave imaging of irregular shaped metal targets is reported and the focus is to obtain the full 2-D geometry of the target. The study includes full 2-D target scanning and the analysis of scattered signal received from the target (echo signal). The proper processing of the echo signal provides the exact target signature. The analysis is carried out in the X-band region...
The full waveform modelling of Ground Penetrating Radar (GPR) signal is a promising approach to implement GPR system. The complexity of inverting this model is very high. With suitable optimization scheme, it is possible to invert the model with reasonable efficiency and accuracy. This paper implements a full wave inversion method with Genetic Algorithm (GA) based optimization scheme to extract the...
A Pi-network topology using MIM-cap free digitally NMOS capacitors is demonstrated. Based on a 130 nm Bulk-CMOS process of Infineon Technologies, this circuit contains stacked transistors to vary the capacitance. It also features a direct through mode between ports to draw the minimum insertion losses of 0.36 dB at 824 MHz. The 3 capacitances can be modified from 0.2 pF to 3 pF and show a Maximum...
Custom designed untethered helmet mounted electronics and novel signal processing techniques are developed for early detection of hematoma caused by traumatic brain injury (TBI) using fNIR system. Modeling behavior of broadband (30–1000 MHz) frequency modulated near infrared (NIR) photons through a multi layer phantoms, representing human head with normal and abnormal brain optical parameters, are...
In this paper a new design of periodic structure has been proposed. These periodic structures are stepped impedance open circuited stubs loaded on a 50 ohm microstrip line. On the ground plane of microstrip periodic rectangular slots are made. These slots are responsible for the enhancement of insertion loss characteristics and give wider stop band characteristic. The period of the structures loaded...
Passively temperature stabilized opto-electronic oscillators (OEO) using composite Hollow Core — Photonic Crystal Fiber (HC-PCF) and Single Mode Fibers (SMF-28) are analyzed and reasons for a poor close in to carrier phase noise is justified due to a low effective quality factor. The reported phase noise performance is quantified and attributed to excessive loss of HC-PCF fibers. In addition analysis...
The design and development of a low noise amplifier that exhibits sub dB noise figures at X band, using a commercially available pHEMT process is presented here. Novelties in our design include the use of stabilizing networks that don't employ resistors and the use of transmission line based inductors that provide a higher Q alternative to spirals. These techniques serve to minimize the lowest achievable...
A three-dimensional Multiresolution Frequency Domain (MRFD) method is utilized to compute bistatic radar cross sections of arbitrarily shaped inhomogeneous chiral objects. The proposed formulation is successfully verified by computing the scattering of an inhomogeneous chiral cube. The advantages of the proposed method are demonstrated by comparing the results to those obtained from the Finite Difference...
Millimeter-wave switching power amplifiers are developed both in V-band and in W-band targeting successful line-up implementations in low-power transmitter applications using 45nm SOI CMOS process. The single power-stage V-band power amplifier is designed using mixed switching mode class-ElF topology and achieves 10dBm Psat, 20% peak PAE and >45% drain efficiency at 52GHz from 1.0V supply. This...
The article describes the application of Artificial Bees Colony algorithm for synthesis of broadside and scanned beam pattern using time modulated linear antenna array. The algorithm is used to obtain the optimum time pulses in order to generate the desired beam pattern at the central frequency while constraining the side band radiation bellow a fixed level. Two instances have been presented: first...
This paper investigates TiO2 loaded metal diagonal and square horn antennas and specific absorption rate (SAR) distributions in a phantom bio-medium due to these antennas through simulation. Diagonal horn is a multimode horn antenna whereas in conventional square horn only TE10 mode propagates. Both diagonal and square horns, which are terminated in a phantom bio-medium are designed and simulated...
In this paper, a non-uniform trace configuration to reduce crosstalk in printed circuit board (PCB) interconnects is investigated. The aim is to reduce crosstalk without incorporating additional PCB components in order to equalize propagation delays or modify inductive and capacitive couplings between the adjacent traces. This can be established by replacing a uniform victim trace on a PCB with a...
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