Department of Electrical and Electronics Engineering

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Subject: search.filters.subject.Ultra-wideband (UWB) antenna

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    Edge perturbation effect in polygonal patch antennas
    (IEEE, 2015) Singhal, Rahul
    The effect of edge perturbation in vertex-fed polygonal patch antennas is studied and analyzed. A polygram shape is obtained by perturbing the edge of polygon. Here, edges of a pentagon and a hexagon are perturbed to obtain a pentagram and hexagram respectively. Pentagram and hexagram patch designs are simulated for different angles (θ) formed when midpoint (vm) of edge of polygon moves towards the center of polygon between adjacent vertices to understand the effect of edge perturbation. The characterization of antenna designs to observe the effect of change in patch design on scattering, impedance and gain characteristics of antennas is performed through simulation on CST MWS®. It is observed that wideband characteristics between 12 to 20 GHz of pentagonal and hexagonal patch antennas are retained with pentagram and hexagram geometries till angle θ is greater than 165.63° and 163.15° respectively. For lower values of θ, multiband behavior is observed for polygram patch antenna designs. Analyzing results of all patch geometries reflects that the performance of the pentagonal patch antenna is better in terms of gain compared to others within the operating band.
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    Gain Improvement in Polygonal Patch Antennas
    (IEEE, 2015) Singhal, Rahul
    The effect of polygonal slot in vertex-fed polygonal patch antennas is studied and analyzed. A polygonal shaped slot is obtained by creating a polygonal slot at the center of polygon. Here, the pentagonal and hexagonal shaped slot is created at the center of a pentagon and a hexagon. Pentagonal and hexagonal shaped slotted patch designs are simulated for different radius of slot (R2) formed when vertices of polygonal slot moves from center towards the vertices of polygon to understand the effect of polygonal slot. The characterization of antenna designs to observe the effect of slot in patch design on scattering, impedance and gain characteristics of antennas is performed through simulation on CST MWS ® . It is observed that wideband characteristics between 12 to 28 GHz of pentagonal and hexagonal patch antennas are retained with pentagonal and hexagonal shaped slot geometries till radius is equal to 15 mm and 16 mm respectively. For lower values of R2, multiband behavior is observed for polygonal shaped slotted patch antenna designs. Analyzing gain results of all slotted patch geometries reflects that the performance of the hexagonal patch antenna is better in terms of gain compared to others within the operating band.
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    Design of Ultra Wideband Cubic Dielectric Resonator Antenna Surrounded by Dielectric Micropillars for THz Applications
    (IEEE, 2021) Singhal, Rahul
    In this paper, a cubic dielectric resonator antenna (CDRA) with patterned structure fed through a microstrip line using gold is proposed. Geometry-induced resonant frequency is synthesized with cuboid periodic pattern through micro pillars grown around the DRA. Following the idea of frequency excitation, a synthesized frequency inherits and combines the modal features from several conventional ones of regular DRAs. Antenna radiation patterns have fine complementation, meanwhile, they are excited by a shared feed. To further demonstrate the mechanism of frequency excitation within ultra-wideband (UWB), the field distribution of the proposed CDRA with micro pillars around it is analyzed by varying the height of the pillars. The radiation patterns and surface fields around the core frequencies are also demonstrated here. The simulation results suggest that periodic geometric structures can be utilized to excite a frequency within UWB band for THz applications.
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    Probe-Fed Hexagonal Ultra Wideband Antenna Using Flangeless SMA Connector
    (Springer, 2019-09) Singhal, Rahul
    An ultra wideband (UWB) antenna fed through a flangeless standard SMA connector near one of the vertices of hexagonal patch is introduced here, in this paper. The designed antenna possess a half elliptical but truncated ground plane with a rectangular slot to achieve UWB with monopole radiation characteristics. The antenna prototype provides an impedance bandwidth of 8.3 GHz from 2.3 to 10.6 GHz with a WLAN band rejection of 1.6 GHz from 4.9 to 6.5 GHz. Antenna measurements show that removal of flanges modifies a C-band antenna to an UWB antenna. The demonstrated technique can be utilized to achieve ultra wideband in probe fed antenna. Measurement results match the expectations as predicted by simulation results.