Chinmoy Saha

Compact SRR Loaded UWB Circular Monopole Antenna With Frequency Notch Characteristics

This paper presents the design of a compact split ring resonator (SRR) loaded coplanar waveguide (CPW) fed ultrawideband circular monopole antenna having frequency notch characteristics. The electromagnetic coupling of the SRR with the CPW yields the frequency notch. Fabricated prototypes were measured and compared with simulations and good agreement was obtained. The impedance and radiation plots confirm the suppression of the desired notch frequency. A theoretical formulation to calculate the notch frequency is also proposed and validated.

Compact Dual-SRR-Loaded UWB Monopole Antenna With Dual Frequency and Wideband Notch Characteristics

This letter presents the design of a compact dual-split-ring-resonator (SRR)-loaded coplanar waveguide (CPW)- fed ultrawideband circular monopole antenna exhibiting dual frequency notch and wideband notch characteristics. The SRR pairs are inductively coupled to the radiator and loaded on the back side of the CPW line. Fabricated prototypes were measured and compared to simulations, and good agreement was obtained.

Square split ring resonator backed coplanar waveguide for filter applications

In this paper, we present a design of a coplanar waveguide loaded with square split ring resonators for filter applications. A theoretical formulation to estimate the resonant frequency of the square split ring resonator is also proposed. Experimental verification of the proposed theory is reported and the computed data are also compared with

Theoretical Model for Estimation of Resonance Frequency of Rotational Circular Split-Ring Resonators

Absract In this article, a split-ring resonator with a rotated inner ring is analyzed for frequency tuning of the magnetic resonance of the split-ring resonator. Simulated results reveal an increase in the resonance frequency with an increasing angle between the splits. A simple theoretical model is proposed for accurate estimation of this resonance frequency for angular separation between the splits using simplified analytical formulations. The computed results using the proposed model are verified with simulated results. A close comparison between the present formulation and previously measured results for conventional circular split-ring resonators is also revealed.

Estimation of the resonance frequency of conventional and rotational circular split ring resonators

In this paper, we propose a theoretical model to estimate the accurate resonance frequency of a circular split ring resonator (SRR). Moreover, the model also predicts the shift in the resonance frequency for rotational SRR. The computed results are compared with available measured results and simulated results obtained using an electromagnetic simulator.

Square Split Ring Resonators: Modelling of resonant frequency and polarizability

In this paper, we propose a theoretical model to estimate the resonance frequency and the magnetic polarizability of the square split ring resonators (S-SRR) having varying gap width within the rings. The model also predicts the quantitative change in polarizability depending on the geometrical orientation of the S-SRR. The computed results are verified with results obtained using an electromagnetic simulator.

Estimation of the resonant frequency and magnetic polarizability of an edge coupled circular split ring resonator with rotated outer ring

In this paper, a theoretical model is proposed to estimate the resonant frequency of a circular split ring resonator (C-SRR) in which the outer ring is rotated. The variation in the resonant frequency with angle of rotation of the SRR is theoretically calculated. The computed values are then compared with the simulated results using an electromagnetic simulator. Also, the magnetic polarizability for different angle of rotation is extracted from the simulated data.

Ultra-Wideband Antipodal Tapered Slot Antenna With Integrated Frequency-Notch Characteristics

This communication presents the design of an ultra-wideband antipodal tapered slot antenna (ATSA) with frequency notch characteristics. Subwavelength resonators in the form of square split-ring resonators are placed on the aperture as well as on the feed section of the ATSA to invoke the frequency notches. The electromagnetic coupling of the SRRs with the radiating aperture and with the magnetic fields due to the fringing at the microstrip line feed yields the frequency notches. The invoked notches are sharp in comparison with previously reported designs. The fabricated prototypes were experimentally verified through measurements, and a good agreement with simulations was obtained. The impedance and radiation plots confirm the suppression of the desired notch frequency. A theoretical formulation to calculate the notch frequency is also proposed and validated.

Resistively loaded slotted microstrip patch antenna with controllable bandwidth

This article demonstrates an alternative way of controllable resistive loading in microstrip patch antenna in order to increase its bandwidth. As microstrip patch antenna is a high Q structure, thereby narrow bandwidth, resistive loading (introducing lossy lumped element inside the antenna structure) is considered as potential technique for improving bandwidth. Instead of conventional resistive loading i.e placing resistance of desired value across the substrate an alternative technique of resistive loading is proposed. Here resistances are connected across the slots of microstrip patch antenna. This method of resistive loading is easy and controllable. Resistive loading is performed on a dual slot rectangular microstrip patch antenna. Behavior of the loaded structure for different resistance values and different slot positions has been studied. A significant improvement in the bandwidth of slotted microstrip patch antenna has been achieved at the expense of gain. This antenna is designed to operate in the frequency range of (2.4/2.5GHz) which partially covers WiFi and WiMax frequency range.

Design of a reconfigurable dual state planar filter using SRRs and MEMS on a coplanar waveguide

Design of a reconfigurable dual state planar filter configured using MEMS switch is proposed in this paper. The design consists of a coplanar waveguide loaded with SRRs and integrated with MEMS switch. The SRR loaded coplanar waveguide yield a notch in the transmission coefficient. However, with the actuation of the MEMS switch the filter yields a narrowband response. Su8 cantilever beam is used as a micro-switch and design guidelines are provided for the required pull in voltage for deflection of beam.