A COMPACT COPLANAR BROADBAND RECTANGULAR SLOT ANTENNA WITH E-SHAPED FEEDING STRUCTURE FOR GPR APPLICATIONS

Abstract. Slots in metallic ground planes are very promising candidates for conformal antenna applications. However, a low-profile unidirectional antenna requires a back reflector close to the slot and the resulting stripline feed causes strong excitation of parallel-plate modes. In this contribution, we consider unidirectional reflector-backed slot configurations with parallel-plate mode suppression by shorting pins. Starting from a parametric study with respect to shorting pin location and back reflector distance, we present a stripline-fed rectangular slot element with radiation efficiency of more than 80% and a bandwidth of about 5% at centre frequency 10GHz. A careful optimisation of shorting pin locations guarantees reliable parallel-plate mode suppression without deteriorating the slot radiation behaviour. Coupling coefficients between parallel and aligned rectangular slot elements are presented. For increased bandwidth applications, a bow-tie slot element with about 8% bandwidth and radiation efficiency of close to 80% is proposed.

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Reconfigurable 2×1 CPW-Fed Rectangular Slot Antenna Array (RSAA) Based on Graphene for Wireless Communications

Applied Computational Electromagnetics Society ◽

10.47037/2020.aces.j.360621 ◽

2021 ◽

Vol 36 (6) ◽

pp. 788-795

Author(s):

Dalia Elsheakh ◽

Osama Dardeer

Keyword(s):

Wireless Communications ◽

Antenna Array ◽

Coplanar Waveguide ◽

Ultra Wideband ◽

Slot Antenna ◽

Impedance Bandwidth ◽

Average Gain ◽

Rectangular Slot ◽

High Data ◽

Peak Gain

This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .

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Arrow Patch-Slot Antenna for 5G Lower Frequency Band Communications

Applied Computational Electromagnetics Society ◽

10.47037/2020.aces.j.351178 ◽

2021 ◽

Vol 35 (11) ◽

pp. 1418-1419

Author(s):

Yuhao Feng ◽

Yiming Chen ◽

Atef Elsherbeni ◽

Khalid Alharbi

Keyword(s):

Antenna Arrays ◽

Coplanar Waveguide ◽

Ground Plane ◽

Base Stations ◽

Slot Antenna ◽

Main Beam ◽

Antenna Element ◽

Single Element ◽

Rectangular Slot ◽

Compact Size

A compact size arrow shaped patch in a rectangular slot antenna is designed for 5G communications in the lower 3 to 6 GHz band. The antenna element is fed through a coplanar waveguide with partial ground plane for better impedance matching with 50 Ohms across the entire band. The maximum gain of a single element is 3.8 dB at 3.7 GHz, while for linear arrays of 5 and 15 elements with uniform excitation the maximum gains are 10.9 dB and 16 dB, respectively. The 5 and 15 elements arrays provide scanning range with no significant degradation of the main beam up to 30˚ and 45˚, respectively. The properties of this antenna element makes it suitable for 5G wireless mobile devices and miniaturized base stations antenna arrays.

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Polarization Reconfigurable Dual-Band Rectangular Slot Antenna

Frequenz ◽

10.1515/freq-2019-0020 ◽

2019 ◽

Vol 73 (9-10) ◽

pp. 339-351

Author(s):

Rohit Kumar Saini

Keyword(s):

Circular Polarization ◽

Linear Polarization ◽

Dual Band ◽

Slot Antenna ◽

Pin Diodes ◽

Rectangular Slot ◽

Left Hand ◽

Right Hand ◽

Lower Band ◽

The Senses

Abstract A novel dual-band rectangular slot antenna is presented for dual-sense reconfigurable polarization. A W-shaped microstrip feedline and two rectangular parasitic patches are used to obtain dual-band circular polarization. Further, the feedline is modified so that the senses of polarization at the two bands are opposite. By introducing PIN-diodes in the feed lines, polarization can be switched among left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), and linear polarization (LP). A prototype dual-band dual-sense antenna with f01 = 1.9 GHz and f02 = 3.45 GHz is fabricated in a 1.6 mm thick FR4 substrate. The measured circular polarized bandwidths are more than 7.6 % for the lower band and 5 % for the upper band.

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Analysis of a Rectangular Slot Antenna Loaded By a Dielectric Hemisphere With Double Dielectric Coatings

Journal of Electromagnetic Waves and Applications ◽

10.1163/156939300x01634 ◽

2000 ◽

Vol 14 (6) ◽

pp. 857-872 ◽

Cited By ~ 3

Author(s):

H.T. Hui ◽

E.K.N. Yung

Keyword(s):

Slot Antenna ◽

Rectangular Slot ◽

Dielectric Coatings

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Rectangular Slot Antenna with Asymmetrical Conductor Strip for Bandwidth Enhancement Coverage UWB Standard

Communications in Computer and Information Science - AsiaSim 2014 ◽

10.1007/978-3-662-45289-9_10 ◽

2014 ◽

pp. 105-115 ◽

Cited By ~ 1

Author(s):

Tuanjai Archevapanich ◽

Paitoon Rakluea ◽

Noppin Anantrasirichai ◽

Boonchana Purahong ◽

Vanvisa Chutchavong

Keyword(s):

Slot Antenna ◽

Bandwidth Enhancement ◽

Rectangular Slot ◽

Conductor Strip

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Design of Wideband Slot Antenna Array with Stereoscopic Differentially Fed Structures

International Journal of Antennas and Propagation ◽

10.1155/2019/9285476 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14 ◽

Cited By ~ 1

Author(s):

Guang Sun ◽

Ge Gao ◽

Tingting Liu ◽

Yi Liu ◽

Hu Yang

Keyword(s):

Antenna Array ◽

High Gain ◽

Radar System ◽

Slot Antenna ◽

Impedance Bandwidth ◽

Antenna Element ◽

Radiation Characteristics ◽

Wide Bandwidth ◽

Feeding Structure

In this paper, a wideband slot antenna element and its array with stereoscopic differentially fed structures are proposed for the radar system. Firstly, a series of slots and a stereoscopic differentially fed structure are designed for the antenna element, which makes it possess a wide bandwidth, stable radiation characteristics, and rather high gain. Moreover, the stereoscopic feeding structure can firmly support the antenna’s radiation structure and reduce the influence of feeding connectors on radiating performance. Secondly, a 4 × 4 array is designed using the proposed antenna element. And a hierarchical feeding network is designed for the array on the basis of the stereoscopic differentially fed structure. For validation, the antenna element and 4 × 4 array are both fabricated and measured: (1) the measured −10 dB impedance bandwidth of the antenna element is 62% (6.8–12.9 GHz) and the gain within the entire band is 5–9.7 dBi and (2) the measured −10 dB impedance bandwidth of the array is approximately 50% (7 to 12 GHz) with its gain being 14–19.75 dBi within the entire band. Notably, measured results agree well with simulations and show great advantages over other similar antennas on bandwidth and gain.

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