scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Study of Electromagnetic Band Gap Structures for antenna application

26 Mar 2015-pp 1-4
TL;DR: In this paper, the authors analyzed the Electromagnetic band gap structure that acts as a surface wave suppresser for 2.4 GHz frequency range and the proposed structure is analyzed using High Frequency Structural Simulator.
Abstract: This paper analyses the Electromagnetic Band Gap Structure that acts as surface wave suppresser. The High impedance characteristics for the design frequency is obtained by two port transmission line method. Application of the Electromagnetic Band Gap Structure for isolation between antennas is carried out. Reducing the size of EBG structure is the main aim of the paper and it is carried out by the use of C shaped slots on every unit cell structure. This design provides satisfactory characteristics for using the antenna in 2.4GHz frequency range. The proposed structure is analyzed using High Frequency Structural Simulator.
Citations
More filters
10 Oct 2005
TL;DR: In this article, simple squares of simple squares are compared to convoluted and interleaved elements to reduce band gap frequency for fixed periodicity and a reduction of 42% was obtained for one (Hilbert) convolution.
Abstract: Electromagnetic band-gap structures of simple squares are compared to convoluted and interleaved elements to reduce band-gap frequency for fixed periodicity. A reduction of 42% in band gap frequency is obtained for one (Hilbert) convolution. This frequency reduction increases to 55% when adjacent elements in the structure are interleaved. (6 pages)

13 citations

Journal ArticleDOI
TL;DR: The simulated results show that the antenna gain has been increased throughout the entire bandgap of EBG operating in 2.25 to 4.25 GHz, and rest of radiation performances remain highly preserved.
Abstract: —In this research work, we have proposed an inset feed rectangular microstrip patch antenna operating at 2.45 GHz in the Industrial, Scientific and Medical (ISM) band for wireless communication. This conventional design of antenna has been modified with defected ground (DG) plane. When this is optimized back to 2.45 GHz, a miniaturization of 37.9 % of patch size has been achieved along with the enhancement in radiation performance. This design is then modified and loaded with mushroom-type Electronic Band-Gap (EBG) structure on the top of dielectric FR-4 substrates. This creates a band-gap region that suppresses the surface waves considerably, thus improves the overall performance and functionality of the proposed antenna. Radiation characteristics such as S-parameters, directivity, gain, efficiency, bandwidth, VSWR and Z11 of microstrip antenna have been performed and compared. The simulated results show that the antenna gain has been increased throughout the entire bandgap of EBG operating in 2.25 to 4.25 GHz. Moreover, rest of radiation performances remain highly preserved.

11 citations

Proceedings ArticleDOI
G. Anitha1, Suresh Kumar M1, M. Ayyadurai1, Senthil Kumar C1, G. Ramkumar1 
03 Jun 2021
TL;DR: In this paper, the authors proposed a novel miniaturization single bit MEMS phase offset (shifter) using triangular Micro-electro mechanical system (MEMS) switches.
Abstract: This article proposes a novel miniaturization single bit MEMS phase offset (shifter) using triangular Micro-electro mechanical system (MEMS) switches. The primary goal in the design of a single-bit switched delay line digital phase offset is to reduce the area of phase offset bits and the minimize the number of switches, which aids in the reduction of mechanical switching errors during the turn ON and OFF operation. The proposed phase shifter is simply based on a switched delay route and reference route configuration, which is connected with a gold connection sequence switch. The phase offset is built on 50 Ohm coplanar waveguide (CPW) configuration, which would generally be used in radio frequency (RF) MEMS systems. The RF and mechanical characteristics of the proposed switches were analyzed using Intellisuite software, and the finite element method was carried out in the HFSS software. The performance of the S 11 (return loss) and S 21 (insertion loss) of the miniaturized single bit phase shifter (22.5°) are 23 dB and 0.55 dB, respectively. The miniaturization phase offset is reduced by 30% by using three triangular SPST switches.

10 citations

Journal Article
TL;DR: In this paper, the effect of the number of EBG and AMC structures on the radial line slot array (RLSA) antenna structure at a frequency of 28 GHz was analyzed.
Abstract: This paper is a study on the electromagnetic band gap (EBG) and artificial magnetic conductor (AMC) on the radial line slot array (RLSA) antenna structure at a frequency of 28 GHz. The RLSA antenna is known based on its characteristic which has high gain, durable, simple structures, high efficiency and low cost of fabricating. This project is focusing on the study of the RLSA antenna with the Electromagnetic Band Gap (EBG) and Artificial Magnetic Conductor (AMC) with analyzes the effect of number EBG and AMC structures applied to the antenna. It enhances the performances of the RLSA antenna before the EBG structure is added. This may be due to eliminating the several numbers of slots on the radiating plate is the reason for the present number of EBG structures applied to it. The lowest value of S11 for eight (8) units EBG is -41.4686 dB at a frequency of 29.86 GHz, the directivity value is 25.60 dBi and realizes a gain of 25.26 dB at a frequency of 28 GHz. While the AMC structure can reduce the side lobes from -2.7 dB for nonelement of AMC to -1.7 dB for eight (8) and nine (9) elements. This RLSA antenna with AMC and EBG produces high directivity which is 26.10 dBi compared to conventional RLSA antenna which is 21.70 dBi. This antenna can also be used as widely applications such as RADAR and satellite communication.

Cites methods from "Study of Electromagnetic Band Gap S..."

  • ...The EBG structure is applied to avoid some undesired operating modes and control the harmonics Hence, to reduce the specific absorption rate or SAR (back radiation) [17]....

    [...]

References
More filters
Book
01 Jan 1982
TL;DR: The most up-to-date resource available on antenna theory and design as mentioned in this paper provides an extended coverage of ABET design procedures and equations making meeting ABET requirements easy and preparing readers for authentic situations in industry.
Abstract: The most-up-to-date resource available on antenna theory and design Expanded coverage of design procedures and equations makes meeting ABET design requirements easy and prepares readers for authentic situations in industry New coverage of microstrip antennas exposes readers to information vital to a wide variety of practical applicationsComputer programs at end of each chapter and the accompanying disk assist in problem solving, design projects and data plotting-- Includes updated material on moment methods, radar cross section, mutual impedances, aperture and horn antennas, and antenna measurements-- Outstanding 3-dimensional illustrations help readers visualize the entire antenna radiation pattern

14,065 citations

Book
01 Apr 1990

10,459 citations

Journal ArticleDOI
TL;DR: In this paper, a new type of metallic structure has been developed that is characterized by having high surface impedance, which is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements and distributed in a two-dimensional lattice.
Abstract: A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts dc currents, it does not conduct ac currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed. The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements, and distributed in a two-dimensional lattice. The surface can be described using solid-state band theory concepts, even though the periodicity is much less than the free-space wavelength. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas.

4,264 citations


"Study of Electromagnetic Band Gap S..." refers background in this paper

  • ...designed for λ /4 length and i transformer which is also design patch antenna is designed by us defined in the literature [7]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the fundamental effects of superstrate (cover) materials on printed circuits antennas are investigated and a general criterion is given for choosing a superstrate to optimize efficiency for the important case of nonmagnetic layers with the antenna at the interface.
Abstract: The fundamental effects of superstrate (cover) materials on printed circuits antennas are investigated. Substrate-superstrate resonance conditions are established which maximize antenna gain, radiation resistance, and radiation efficiency. Criteria are determined for material properties and dimensions for which surface waves are eliminated and a radiation efficiency due to substrate-superstrate effects of e_{s} = 100 percent is obtained. Criteria for nearly omnidirectional \bar{H} -plane patterns and nearly omnidirctional \bar{E} -plane patterns are presented. Finally, a general criterion is given for choosing a superstrate to optimize efficiency for the important case of nonmagnetic layers with the antenna at the interface.

445 citations


"Study of Electromagnetic Band Gap S..." refers methods in this paper

  • ...Equivalent capacitance and inductance o EBG structure is calculated by using the form literature [6]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the effect of etched grooves around a patch element has been studied for performance improvement, and effective dielectric constant curves for the shielded micromachined substrates are provided for accurate design of patch antennas.
Abstract: Silicon micromachining has been used to demonstrate the possibility of building high performance microwave and millimeter-wave antennas. To suppress higher order substrate modes and increase the bandwidth of a patch antenna, silicon substrate has been used and material has been selectively removed under the patch area. In addition, the effect of etched grooves around a patch element has been studied for performance improvement, it has been shown that micromachined substrate structure can effectively suppress unwanted surface wave modes resulting in improved radiation efficiency. Moreover, effective dielectric constant curves for the shielded micromachined substrates are provided for accurate design of patch antennas. We have demonstrated that mutual coupling between the radiating patch elements due to surface waves can be controlled using various micromachined substrate configurations.

96 citations


"Study of Electromagnetic Band Gap S..." refers methods in this paper

  • ...Few techniques developed to reduce the surface wave excitation in antennas are drilling an air cavity below the patch [2], placing an additional dielectric layer over the patch [3] or optimizing the patch shape so that surface waves are not excited....

    [...]