Showing papers by "Jayanta Mukherjee published in 2013"

A Novel Cup-Shaped Inverted Hemispherical Dielectric Resonator Antenna for Wideband Applications

Abstract: A novel cup-shaped dielectric resonator antenna (DRA) geometry based on inverted hemispherical dielectric resonator antenna (HDRA) is proposed and investigated. The material used for investigation is Rogers TMM10, which is a ceramic thermoset polymer composite material having a dielectric constant of er = 9.2. The cup-shaped geometry offers a wideband of 83% impedance bandwidth for dB at 2.3 GHz. Two modes have also been investigated which show the presence of TM101-like mode and TM01δ-like mode of the cylindrical DRA. The peak gain observed is 4.5 dBi at around 2.3 GHz. The measured results show that the efficiency is above 90% for the bandwidth of operation.

A Novel Half Hemispherical Dielectric Resonator Antenna with Array of Slots for Wideband Applications

Abstract: A novel half Hemispherical Dielectric Resonator Antenna (HDRA) with an array of slots has been designed. The dielectric material used is Rogers TMM10, which is a ceramic thermoset polymer composite material having a dielectric constant of "r = 9:2. Periodic holes lower down the Q factor of the antenna and hence enhance the impedance bandwidth. The measured value of the 10dB bandwidth is close to 1GHz (»17.74%). The mode investigated is a TM101 like mode. Further, the efiect of increasing the probe length on the resonance and the radiation pattern is also studied. As the probe length is increased, a shift in the resonant frequency is observed and the Dielectric Resonator Antenna (DRA) behaves as a monopole antenna loaded with the DRA. The experimental results conflrm that a wide bandwidth of 1.3GHz (»29%) with a high gain of 7.2dBi can be obtained. The radiation pattern of such an antenna is directive in nature.

Selection and placement of decoupling capacitors in high speed systems

Abstract: The Power Integrity problem for high speed systems is discussed in context of selection and placement of decoupling capacitors. Power Integrity is maintained by damping the cavity mode peaks at resonant frequencies using decoupling capacitors. This article focuses on damping cavity mode effects in power delivery networks by the particle swarm optimization technique. The s-parameter data of power plane geometry and capacitors are used for the accurate analysis including bulk capacitors and VRM, for a real world problem. The optimal capacitors and their locations on the board are found using the presented methodology, which can be used for similar power delivery networks in high speed systems.

BLUETOOTH/UWB DUAL-BAND PLANAR DIVERSITY ANTENNA WITH WiMAX AND WLAN BAND-NOTCH CHARACTERISTICS

Abstract: In this paper, a stage wise realization of compact Bluetooth | UWB dual-band diversity antenna with WiMAX and WLAN band-notch characteristics is presented. The proposed structure consists of two co-planar semicircular dual band-notch monopole antennas, mounted with planar spiral. Individual antenna conflguration provides an impedance bandwidth (VSWR < 2) for dual- band i.e., both Bluetooth and UWB bands. For dual band-notch characteristic, two sets of spirals are capacitively coupled with the feed line of antenna. This conflguration provides band-notch (VSWR < 2) for WiMAX i.e., (3.3{3.6GHz) and WLAN (5.13{5.85GHz) bands. For enhancing reception capabilities of the proposed structure, twin coplanar antennas are used to fulflll diversity requirements. However, due to coplanar and close proximity to each other, there is high possibility of mutual coupling between coplanar antenna elements. To address the mutual coupling between elements, cross-strip variable- sized frequency selective structures are used. Antenna diversity of the proposed structure is validated by measuring radiation pattern characteristic and envelop co-relation factor (ECC). A good agreement between measured and simulated responses ensures that the proposed diversity antenna can be used for interference free Bluetooth/UWB dual-band applications.

Compact printed monopole UWB antenna loaded with non — Concentric open — Ended rings for triple band — Notch characteristic

Abstract: A compact, ultra-wideband monopole antenna with triple band-notch characteristic is presented. Proposed antenna consists of an elliptical radiator for achieving UWB bandwidth. For rejecting WiMAX (3.3-3.6 GHz) and WLAN (5.15-5.3 GHz, 5.7-5.825 GHz) bands, antenna is loaded with Non-concentric open ended rings. The effective lengths for these non-concentric rings are approximately half wavelength for the respective notch frequencies. Overall surface dimension of the fabricated antenna is 25×18 mm2. The proposed antenna is simulated, fabricated and tested experimentally for its performance. A good agreement between simulated and experimental results ensures the suitability of the proposed antenna for various UWB applications.

A novel Hemispherical Dielectric Resonator Antenna with rectangular slot and Defected Ground Structure for low cross polar and wideband applications

Abstract: In this paper, a novel Hemispherical Dielectric Resonator Antenna (HDRA) with a rectangular slot and rectangular shaped Defected Ground Structure (DGS) is proposed and investigated. A total of three slots are etched as DGS. The central slot is a pierce through slot, protruding from the ground plane to the HDRA. In doing so, the bandwidth of operation increases from 10.4% to 23% (S11 <; -10 dB) with a gain of 5.85 dBi at the fundamental resonant frequency. The fundamental frequency of resonance is 2 GHz which excites the TE111 mode in the HDRA. Further, the effect of DGS modifies the current distribution on the ground which leads to very low cross polar power levels in the radiation pattern.

Multi-band notch uwb band pass filter with novel contiguous split rings embedded in symmetrically tapered elliptic rings

Abstract: A compact multiple band-notch ultra-wide band (UWB) band-pass fllter (BPF) with surface area of 18£12mm 2 is introduced in this article. The proposed fllter is a combination of novel symmetrically tapered elliptic rings (STER) and contiguous split ring resonators (SRR), with stepped impedance resonator (SIR) structure to realize the multi-band notch UWB pass band characteristics. In the proposed structure, band-notches are generated for interfering microwave bands such as, WiMAX, WLAN and X-band applications. These notches are achieved by optimizing structural parameters of SRR sections. The proposed fllter is fabricated on RT/Duroid 5880 substrate with "r = 2:2 and thickness of 0.787mm. The fabricated prototype is measured and a good agreement between simulated and measured results ensures suitability of the proposed fllter for UWB applications.

A novel EBG structure with super-wideband suppression of simultaneous switching noise in high speed circuits

Abstract: A novel uniplanar electromagnetic band-gap structure to maintain power integrity by suppressing simultaneous switching noise (SSN) is presented. The EBG structure with stopband from 750 MHz to 5.10 GHz is designed, fabricated and validated using network analyzer. Simulation results are verified by measurements and compared with the earlier published structures. Suppression of resonant cavity modes of power plane by EBG structure is also shown. The adoption of EBG structure in power deliver network is recommended to reduce the high frequency noise coupling between neighboring devices. These structures further help in better EMI/EMC compliance of the product by attenuating the propagation of high frequency noise between devices. The EBG structure usage can be on board, package or at die level.

Power Integrity analysis and discrete optimization of decoupling capacitors on high speed power planes by particle swarm optimization

Abstract: Power Integrity problem for a high speed power plane is discussed in context of selection and placement of decoupling capacitors. The s-parameters data of power plane geometry and capacitors are used for the accurate analysis including bulk capacitors and VRM, for a real world problem. The optimal capacitors and their optimum locations on the board are found using particle swarm optimization. A novel and accurate methodology is presented which can be used for any high speed Power delivery Network.

A novel compact comb shaped EBG structure for coupling reduction in WIMAX band

Abstract: A novel dual band compact near to edge located via-comb shape EBG (NELV-CEBG) has been proposed and its compactness has been studied. A good reduction level of 8–21 dB has been observed when 7×3 matrix of the proposed structure has been applied to enhance the isolation between the patch antenna arrays operating over WIMAX band.

A novel cheeseholes type Hemispherical Dielectric Resonator antenna for wireless applications

Abstract: In this paper, a novel cheeseholes type Hemispherical Dielectric Resonator Antenna (HDRA) is proposed. The name has been coined due to the similarity it draws in appearance with a Swiss cheese cube. Here, array of slots are drilled periodically along the three Cartesian axis of the HDRA. In doing so, the bandwidth of operation increases from 10.4% to 25% with a gain of 6.2 dBi at the resonant frequency. The resonant frequency is 2.53 GHz and it excites the TE111 mode. The resonant frequency is most suitable for standard wireless communications with wide band applications.

Design Automation, Modeling, Optimization, and Testing of Analog/RF Circuits and Systems by Particle Swarm Optimization

Abstract: This chapter is an overview of the applications of particle swarm optimization for circuits and systems. The chapter is targeted for the Analog/RF circuits and systems designers. Design automation, modeling, optimization and testing of analog/RF circuits using particle swarm optimization is presented. Various applications of particle swarm optimization for circuits and systems are explained by examples.

Dual polarized reconfigurable dual band-notched UWB antenna with novel tunable EBG structure

Abstract: In this paper a dual band notched reconfigurable dual polarized UWB monopole antenna is proposed. The notch bands have been created with novel diagonally slotted tunable electromagnetic band gap structure.

Wideband rectangular dielectric resonator antenna with novel array of square shaped slots

Abstract: A wideband rectangular dielectric resonator antenna with novel array of square shaped slots has been designed and proposed. The number of symmetrical square shaped array is optimized to 5 × 5 elements. The dielectric material used is a Teflon based ceramic, Rogers RT/ Duroid 6010.2LM having dielectric constant of er = 10.2. Advantage of drilling square shaped slots from conventional rectangular dielectric resonator antennas is twofold; one reduction of the effective dielectric constant, second is antenna weight reduction. Light weight antennas are required in specific applications. The effect of reduction of the effective dielectric constant, results in lowering down of the quality factor. As a result improvement in impedance bandwidth from 9.3 % to 31 % is achieved. The proposed antenna operates in the frequency range of 2.6-3.5 GHz at the resonant frequency of 2.9 GHz. The peak gain of 6.5 dBi is obtained at 3.4 GHz. A good agreement between simulated and measured results predicts that the proposed antenna can be used for applications in wireless communications.

Compact UWB ring sectoral monopole antenna with dual polarization

Abstract: A novel, compact and dual polarized ring Sectoral Monopole Antenna (RSMA) with defected ground is presented for Ultra Wide Band (UWB) applications. Present structure has been derived from the circular monopole antenna to accomplish dual polarization characteristics without much change in the impedance band width, radiation pattern (quasi Omni-directional) and other antenna characteristics. Proposed RSMA with partial and defected ground design, UWB response (i.e. 3.1 GHz-10.6 GHz) with reference to VSWR<;2 is achieved. The antenna is fabricated on a RT/Duroid5880 (er =2.2) substrate having thickness of 0.785 mm with total real-estate of 20×28 mm2. Measurements are in close agreement with the simulated results. Dual polarization characteristics ensure that proposed antenna can be a promising candidate for the UWB applications.

Geometric variations of metal baffle in horn antenna for improved gain

Abstract: In present work we introduce simple metal baffles for improving the gain of horn antenna. The baffle dimensions and distance from the feed are optimized without loading the feed. Performance of baffles like hemisphere, shuttle and variants of ellipse has been studied. Simulation based analysis for 20-30 GHz reveals that gain >21 dB can be achieved with a tradeoff of poor input matching at the edge frequencies. In this work parametric study is done to achieve S11 20 dB with radiation pattern discussed. These proposed structures have shown good performance and are suitable for applications requiring compact and high gain horn antennas.

A novel EBG power plane structure for suppressing SSN in high speed systems

Abstract: A novel uniplanar electromagnetic band-gap structure to maintain power integrity by suppressing simultaneous switching noise is presented. The proposed EBG structure is having stop-band from 600 MHz to 5.3 GHz and can be used as power plane in high speed systems for minimizing the power noise. Suppression of resonant cavity modes of power plane by EBG structure is shown. Simulation results are verified by measurements and compared with the earlier published structures.