A nested square-shape dielectric resonator for microwave band antenna applications

In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band. A solid square dielectric resonator (SSDR) was modified systematically by introducing air-gap in the azimuth (ϕ-direction). By retaining the square shape of the dielectric resonator (DR), the well-known analysis tools can be applied to evaluate the performance of the NSDR. To validate the performance of the proposed NSDR in antenna applications, theoretical, simulation, and experimental analysis of the subject has been performed. A simple microstrip-line feeding source printed on the top of Rogers RO4003 grounded substrate was utilized without any external matching network. Unlike solid square DR, the proposed NSDR considerably improves the impedance bandwidth. The proposed antenna has been prototyped and experimentally validated. The antenna operates in the range of 12.34GHz to 21.7GHz which corresponds to 56% percentage bandwidth with peak realized gain 6.5dB. The antenna has stable radiation characteristics in the broadside direction. A close agreement between simulation and experimental results confirms the improved performance of NSDR in antenna applications.

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Compact and Circularly Polarized Hemispherical DRA for C-Band Applications

Frequenz ◽

10.1515/freq-2018-0215 ◽

2019 ◽

Vol 73 (7-8) ◽

pp. 227-234 ◽

Cited By ~ 1

Author(s):

Shabya Gupta ◽

Vinay Killamsetty ◽

Monika Chauhan ◽

Biswajeet Mukherjee

Keyword(s):

Dielectric Constant ◽

Fractal Geometry ◽

Dielectric Resonator ◽

Close Agreement ◽

Axial Ratio ◽

Dissipation Factor ◽

Impedance Bandwidth ◽

Dielectric Resonator Antenna ◽

Circularly Polarized ◽

Tan Δ

Abstract A novel circular polarized Hemispherical Dielectric Resonator Antenna (HDRA) has been proposed in this paper. The Circular Polarization (CP) and enhanced gain characteristics of the antenna are attributed to the fractal geometry applied on the HDRA. Probe coupling is used to excite the proposed antenna which resonates at 4.16 GHz and offers an impedance bandwidth of 2.6 GHz (57 %), from 3.3 to 5.9 GHz. The gain and efficiency of the antenna are 6.38 dBi and 93 % respectively at 4.16 GHz. The Proposed DRA is designed using FR-4 material having a dielectric constant (εr ) of 4.3 and dissipation factor (tan δ) of 0.025. The designed Antenna is experimentally verified and offers a close agreement between simulated and measured results. This Antenna offers a 3-dB Axial Ratio (AR) bandwidth of 1.1 GHz from 4.2 to 5.3 GHz.

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Novel Wideband Circularly Polarized DRA With Squint-free Radiation Characteristics

10.21203/rs.3.rs-124574/v1 ◽

2020 ◽

Author(s):

Mohammad Abedian ◽

Mohsen Khalily ◽

Vikrant Singh ◽

Pei Xiao ◽

Rahim Tafazolli ◽

...

Keyword(s):

Dielectric Resonator ◽

Vertical Section ◽

Axial Ratio ◽

Impedance Bandwidth ◽

Dielectric Resonator Antenna ◽

Radiation Characteristics ◽

Horizontal Section ◽

Circularly Polarized ◽

Metal Element ◽

Coaxial Probe

Abstract A new single-fed circularly polarized dielectric resonator antenna (CP-DRA) without beam squint is presented. The DRA comprises of an S-shaped dielectric resonator (SDR) with a metalized edge and two rectangular dielectric resonator (RDRs) blocks. A horizontal-section is applied as an extension of the SDR, and a vertical-section is placed in parallel to the metallic edge. A vertical coaxial probe is used to excite the SDR and the vertical RDR blocks through an S-shaped metal element and a small rectangular metal strip, respectively. The two added RDRs that form an L-shaped DR improve the radiation characteristics and compensate for the beam squint errors. A wideband CP performance is achieved due to the excitation of several orthogonal modes such as TEx d11, TEy 1d1, TEz 121, TEy 112, TEx 131, and TEy 311. The experimental results demonstrate an impedance bandwidth of approximately 66:8% (3:71-7:45 GHz) and a 3-dB axial-ratio (AR) bandwidth of about 54:8% (3:72-6:53 GHz) with a stable broadside beam achieving a measured peak gain of about 4:64dBi. Furthermore, a 100% correction in beam squint value from q = 41° to q = 0° with respect to the antenna boresight is achieved.

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T-Shaped Compact Dielectric Resonator Antenna for UWB Application

Advanced Electromagnetics ◽

10.7716/aem.v8i3.1077 ◽

2019 ◽

Vol 8 (3) ◽

pp. 57-63

Author(s):

A. Zitouni ◽

N. Boukli-Hacene

Keyword(s):

Dielectric Resonator ◽

Ground Plane ◽

Ultra Wideband ◽

Impedance Bandwidth ◽

Dielectric Resonator Antenna ◽

Printed Antenna ◽

Frequency Range ◽

Radiation Characteristics ◽

Antenna Structure ◽

Antenna Performance

In this article, a novel T-shaped compact dielectric resonator antenna for ultra-wideband (UWB) application is presented and studied. The proposed DRA structure consists of T-shaped dielectric resonator fed by stepped microstrip monopole printed antenna, partial ground plane and an inverted L-shaped stub. The inverted L-shaped stub and parasitic strip are utilized to improve impedance bandwidth. A comprehensive parametric study is carried out using HFSS software to achieve the optimum antenna performance and optimize the bandwidth of the proposed antenna. From the simulation results, it is found that the proposed antenna structure operates over a frequency range of 3.45 to more than 28 GHz with a fractional bandwidth over 156.12%, which covers UWB application, and having better gain and radiation characteristics.

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Broadband Koch Fractal Boundary Printed Slot Antenna for ISM Band Applications

Advanced Electromagnetics ◽

10.7716/aem.v7i5.780 ◽

2018 ◽

Vol 7 (5) ◽

pp. 31-36 ◽

Cited By ~ 3

Author(s):

V. V. Reddy

Keyword(s):

Experimental Data ◽

Close Agreement ◽

Microstrip Line ◽

Slot Antenna ◽

Impedance Bandwidth ◽

Fractal Boundary ◽

Ism Band ◽

Koch Fractal ◽

Iteration Order

A new broadband radiating slot antenna with fractal shape is modeled, fabricated and experimentally studied. The presented slot antenna is examined for first three iterations. Optimization of iteration factor (IF) and iteration angle (IA) have been done for each iteration order (IO) to enhance impedance bandwidth significantly. All the antennas are fed with a simple microstrip line. Bandwidth achieved with Antenna 1 (IO=1, IF=0.35 and IA=600) is 1550 MHz which is five times more than that of the square slot antenna. The performance of the proposed fractal slots is also compared with the rotated slot antenna. The experimental data validates the reported analysis with a close agreement.

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Novel wideband circularly polarized DRA with squint-free radiation characteristics

Scientific Reports ◽

10.1038/s41598-021-86381-1 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Mohammad Abedian ◽

Mohsen Khalily ◽

Vikrant Singh ◽

Pei Xiao ◽

Rahim Tafazolli ◽

...

Keyword(s):

Dielectric Resonator ◽

Vertical Section ◽

Axial Ratio ◽

Dielectric Resonators ◽

Impedance Bandwidth ◽

Dielectric Resonator Antenna ◽

Radiation Characteristics ◽

Circularly Polarized ◽

Metal Element ◽

Coaxial Probe

AbstractA new single-fed circularly polarized dielectric resonator antenna (CP-DRA) without beam squint is presented. The DRA comprises an S-shaped dielectric resonator (SDR) with a metalized edge and two rectangular dielectric resonators (RDRs) blocks. Horizontal extension section is applied as an extension of the SDR, and a vertical-section is placed in parallel to the metallic edge. A vertical coaxial probe is used to excite the SDR and the vertical RDR blocks through an S-shaped metal element and a small rectangular metal strip. The two added RDRs that form an L-shaped DR improve the radiation characteristics and compensate for the beam squint errors. A wideband CP performance is achieved due to the excitation of several orthogonal modes such as $$TE_{\delta 11}^x$$ T E δ 11 x , $$TE_{1\delta 1}^y$$ T E 1 δ 1 y , $$TE_{121}^z$$ T E 121 z , $$TE_{112}^y$$ T E 112 y , $$TE_{131}^x$$ T E 131 x , and $$TE_{311}^y$$ T E 311 y . The experimental results demonstrate an impedance bandwidth of approximately $$66.8\%$$ 66.8 % (3.71–7.45 GHz) and a 3-dB axial-ratio (AR) bandwidth of about $$54.8\%$$ 54.8 % (3.72–6.53 GHz) with a stable broadside beam achieving a measured peak gain of about $$4.64 \, {\text{dBic}}$$ 4.64 dBic . Furthermore, a 100% correction in beam squint value from $$\theta = 41^\circ$$ θ = 41 ∘ to $$\theta = 0^\circ$$ θ = 0 ∘ with respect to the antenna boresight is achieved.

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