Archita Banerjee

Bio: Archita Banerjee is an academic researcher from University of Calcutta. The author has contributed to research in topics: Dielectric resonator antenna & Microstrip antenna. The author has an hindex of 4, co-authored 8 publications receiving 173 citations.

Higher Order Mode Excitation for High-Gain Broadside Radiation From Cylindrical Dielectric Resonator Antennas

Abstract: A resonant mode (HEM12δ), other than those ( HEM11δ and TM01δ) conventionally excited and used in a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns. Excitation of the mode, being the most challenging aspect, has been discussed and resolved by employing an innovative technique. The proposed concept has been successfully verified and experimentally demonstrated for the first time. More than 8-dBi peak gain with excellent broadside radiation has been obtained from a prototype shaped from a commercially available low-loss dielectric material with relative permittivity 10.

New Technique to Excite Higher-Order Radiating Mode in a Cylindrical Dielectric Resonator Antenna

Abstract: Higher-order HEM12δ mode has been experimentally realized in a cylindrical dielectric resonator antenna (CDRA) very recently revealing broadside radiation like the dominant HEM11δ mode. The primary challenge is the excitation of the mode in a practical DRA sitting on a metal ground plane, which was first resolved by introducing a floating feed as an equivalent current ribbon. In this letter, yet another technique has been explored using a conventional probe-fed CDRA placed on a metal plate. Only a new trough-shaped air cavity has been introduced in the ground plane just beneath the DRA to simulate a special boundary condition, which enunciates desired modal fields. Such a technique may be improvised for other potential applications. The proposed concept has been verified using both simulated and experimental results.

New radiating mode in a Cylindrical DRA to produce broadside high gain radiation

Abstract: Several resonant modes are known in a Cylindrical Dielectric Resonator (CDR), where only two could be used for antenna or radiation purpose. In this paper, we have explored the possibility of exciting a new one (HEM12δ mode) as a radiating mode giving broadside high gain pattern at resonance. New suitable feeding scheme is introduced along with physical insight into the operation of this new DRA is presented.

Design Guidelines for the Cylindrical Dielectric Resonator Antenna Using the Recently Proposed HEM12d Mode [Antenna Designer's Notebook]

Abstract: Excitation of the higher-order HEM12d mode in a cylindrical dielectric resonator antenna (CDRA) was a big challenge, which was recently resolved by the present authors, nearly 30 years after the invention of the dielectric resonator antenna (DRA). Significantly, the radiation characteristics of this mode closely follow those due to the HEM11d mode, but with relatively higher gain. This breakthrough was made possible by introducing a new concept of feeding, and this was experimentally verified using a single prototype. Here, we have thoroughly investigated the design opportunities and limitations in terms of the material properties and dielectric resonator antenna's dimensions. Based on acquired knowledge, a comprehensive design guideline is provided to facilitate future designers estimating the best possible configuration for any specified application. As a significant part of this, the feed design has also been addressed. For practical verification, a customized dielectric resonator antenna was fabricated and measured, indicating excellent agreement with the proposed guidelines.

A new method to obtain HEM 12δ radiating mode in cylindrical DRA

Abstract: Higher order HEM 12δ mode in Cylindrical Dielectric Resonator Antenna (CDRA) has been introduced recently by the present authors with the aim to achieve broadband high gain radiation along with its conventional broadside radiating HEM 11δ mode. Two different techniques have been proposed and demonstrated so far. In this paper, yet another method is proposed, which is the simplest one compared to the earlier ones. Proposed technique uses unusually long vertical probe, placed in touch with the surface of a CDRA, both sharing the same ground plane. Simulated results promise for remarkably satisfactory performance of the CDRA showing high gain broadside radiations caused by both HEM 12δ and HEM 11δ modes. Fabrication and measurements are under progress. Those results will be provided later.

Higher Order Mode Excitation for High-Gain Broadside Radiation From Cylindrical Dielectric Resonator Antennas

Abstract: A resonant mode (HEM12δ), other than those ( HEM11δ and TM01δ) conventionally excited and used in a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns. Excitation of the mode, being the most challenging aspect, has been discussed and resolved by employing an innovative technique. The proposed concept has been successfully verified and experimentally demonstrated for the first time. More than 8-dBi peak gain with excellent broadside radiation has been obtained from a prototype shaped from a commercially available low-loss dielectric material with relative permittivity 10.

Wideband and UWB Antennas for Wireless Applications: A Comprehensive Review

Abstract: A comprehensive review concerning the geometry, the manufacturing technologies, the materials, and the numerical techniques, adopted for the analysis and design of wideband and ultrawideband (UWB) antennas for wireless applications, is presented. Planar, printed, dielectric, and wearable antennas, achievable on laminate (rigid and flexible), and textile dielectric substrates are taken into account. The performances of small, low-profile, and dielectric resonator antennas are illustrated paying particular attention to the application areas concerning portable devices (mobile phones, tablets, glasses, laptops, wearable computers, etc.) and radio base stations. This information provides a guidance to the selection of the different antenna geometries in terms of bandwidth, gain, field polarization, time-domain response, dimensions, and materials useful for their realization and integration in modern communication systems.

Spoof Plasmon-Based Slow-Wave Excitation of Dielectric Resonator Antennas

Abstract: A spoof plasmon (SP)-based slow-wave feeding configuration is proposed, experimentally verified and exploited to excite the fundamental horizontally polarized mode of dielectric resonator antennas (DRAs). As an example, a cylindrical DRA operating at 3 GHz is fed by the proposed feeding structure. The simulation and measurement evidence the unique features of ${\rm TE}_{01\updelta}$ mode such as lower thickness-dependency of the resonant frequencies, superb miniaturization and ultra-compactness, and omnidirectional radiation for horizontally polarized waves. We anticipate that the ground-free SP-based feeding technique could be applied to effectively excite the more “unusual” modes of the isolated DRAs.

Broadband Filtering Dielectric Resonator Antenna With Wide Stopband

Abstract: A low profile stacked dielectric resonator antenna (DRA) and a microstrip metasurface (MS) antenna are investigated and compared in this communication. It has been found that very similar radiation performance including resonant modes, reflection coefficients, boresight gains, and radiation patterns can be obtained between them, indicating that the dielectric superstrate of stacked DRA plays analogous role with MS in enhancing the antenna bandwidth and realized gain. Based on this observation, a broadband, low profile, and high gain filtering cylindrical stacked DRA is inspired by an MS-based filtering antenna. Four resonant modes including the higher order HEM $_{31\delta }$ mode and HEM $_{13\delta }$ mode are simultaneously excited in the DRA to provide a broad bandwidth of 61.4% and a peak gain of 11.4 dBi within passband, whereas a shorting via and two pairs of transverse stubs are introduced into the feeding microstrip line to generate radiation nulls in stopband and realize filtering function. Second harmonic suppression has been achieved without increasing the footprint of the antenna, and an out-of-band suppression of more than 23 dB is obtained within the wide stopband.

Microstrip Patch versus Dielectric Resonator Antenna Bearing All Commonly Used Feeds: An experimental study to choose the right element.

Abstract: Microstrip patches and dielectric resonators (DRs) are two low-profile variants of modern microwave and wireless antennas. However, the DR antenna (DRA) is relatively new and still passing through the stages of development. Both variants are quite similar in terms of performance and characteristics. This article focuses on a meaningful comparative study where we have considered all commonly used feed mechanisms such as coaxial probe, microstrip line, and rectangular aperture for both antennas operating near the same frequency. Circular geometry, i.e., cylindrical DRA (CDRA) and circular microstrip patch antenna (CMPA), have been chosen, and a systematic investigation based on thorough experiments has been executed. Multiple sets of prototypes have been fabricated and measured at 4 GHz. All available data have been furnished and compared, indicating relative advantages and disadvantages. This comparative study should provide qualitative and quantitative instructions to a designer for choosing the right element and corresponding feed based on design requirement and feasibility.