scholarly journals Ultralow Profile, Low Passive Intermodulation, and Super-Wideband Ceiling Mount Antennas for Cellular and Public Safety Distributed Antenna Systems

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2456
Author(s):  
Kok Jiunn Ng ◽  
Mohammad Tariqul Islam ◽  
Adam M. Alevy ◽  
Mohd. Fais Mansor
Keyword(s):  
Radiation Pattern ◽  
Public Safety ◽  
Ground Plane ◽  
Antenna System ◽  
Band Ratio ◽  
Antenna Performance ◽  
Distributed Antenna ◽  
Small Disc ◽  
Passive Intermodulation ◽  
Better Than

This paper presents an ultralow profile, low passive intermodulation (PIM), and super-wideband in-building ceiling mount antenna that covers both the cellular and public safety ultra high frequency (UHF) band for distributed antenna system (DAS) applications. The proposed antenna design utilizes a modified 2-D planar discone design concept that is miniaturized to fit into a small disc-shaped radome. The 2-D planar discone has an elliptical-shaped disc monopole and a bell-shaped ground plane, a stub at the shorting path, with asymmetrical structure and an additional proximity coupling patch to maximize the available electrical path to support the 350 MHz band range. The proposed design maximizes the radome area with a reduction of about 62% compared to similar concept type antennas. Besides, the proposed design exhibits an improved radiation pattern with null reduction compared to a typical dipole/monopole when lies at the horizontal plane. A prototype was manufactured to demonstrate the antenna performance. The VSWR and radiation pattern results agreed with the simulated results. The proposed antenna achieves a band ratio of 28.57:1 while covering a frequency range of 350–10000 MHz. The measured passive intermodulation levels are better than −150 dBc (2 × 20 Watts) for 350, 700 and 1920 MHz bands.

Compact UWB–MIMO antenna with quad-band-notched characteristic

2016 ◽  
Vol 9 (5) ◽  
pp. 1147-1153 ◽  
Author(s):  
Ling Wu ◽  
Yingqing Xia
Keyword(s):  
Correlation Coefficient ◽  
Radiation Pattern ◽  
Mimo System ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Mimo Antenna ◽  
X Band ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Better Than

With quad-band-notched characteristic, a compact ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is introduced in the paper. The UWB–MIMO system has two similar monopole elements and occupies 30 × 45 mm2. By inserting two L-shaped slots, CSRR and C-shaped stubs, four notched bands are achieved (3.25–3.9, 5.11–5.35, 5.5–6.06, and 7.18–7.88 GHz) to filter WiMAX, lower WLAN, upper WLAN, and X-band. Meanwhile, the isolation is obviously enhanced with three metal strips on the ground plane. Results indicate that the antenna covers UWB frequency band of 3.1 – 10.6 GHz except four rejected bands, isolation of better than −18 dB, envelope correlation coefficient of <0.02, and good radiation pattern, thus making it useful for UWB systems.

scholarly journals An Octagonal Ring-shaped Parasitic Resonator Based Compact Ultrawideband Antenna for Microwave Imaging Applications

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1354 ◽  
Author(s):  
Amran Hossain ◽  
Mohammad Tariqul Islam ◽  
Ali F. Almutairi ◽  
Mandeep Singh Jit Singh ◽  
Kamarulzaman Mat ◽  
...  
Keyword(s):  
Experimental Data ◽  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Ground Plane ◽  
Microwave Imaging ◽  
Average Efficiency ◽  
Antenna Performance ◽  
Directional Radiation ◽  
Radiation Directivity

An Ultrawideband (UWB) octagonal ring-shaped parasitic resonator-based patch antenna for microwave imaging applications is presented in this study, which is constructed with a diamond-shaped radiating patch, three octagonal, rectangular slotted ring-shaped parasitic resonator elements, and partial slotting ground plane. The main goals of uses of parasitic ring-shaped elements are improving antenna performance. In the prototype, various kinds of slots on the ground plane were investigated, and especially rectangular slots and irregular zigzag slots are applied to enhance bandwidth, gain, efficiency, and radiation directivity. The optimized size of the antenna is 29 × 24 × 1.5 mm3 by using the FR-4 substrate. The overall results illustrate that the antenna has a bandwidth of 8.7 GHz (2.80–11.50 GHz) for the reflection coefficient S11 < −10 dB with directional radiation pattern. The maximum gain of the proposed prototype is more than 5.7 dBi, and the average efficiency over the radiating bandwidth is 75%. Different design modifications are performed to attain the most favorable outcome of the proposed antenna. However, the prototype of the proposed antenna is designed and simulated in the 3D simulator CST Microwave Studio 2018 and then effectively fabricated and measured. The investigation throughout the study of the numerical as well as experimental data explicit that the proposed antenna is appropriate for the Ultrawideband-based microwave-imaging fields.

scholarly journals Compact Design of 2 × 2 MIMO Antenna with Super-Wide Bandwidth for Millimeters Wavelength Systems

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 233
Author(s):  
Haitham Alsaif ◽  
Mohamed A. H. Eleiwa
Keyword(s):  
Radiation Pattern ◽  
Radio Frequency Identification ◽  
Computer Aided Design ◽  
Ground Plane ◽  
Antenna System ◽  
Ultra Wideband ◽  
Tangent Loss ◽  
Total System ◽  
Wide Bandwidth ◽  
Mimo Antenna

A novel compact planar 2 × 2 antenna system with super-wide bandwidth is presented in this paper. The MIMO antenna has four square-shaped patches with two slots in each that are interconnected with each other using four strip lines printed on a substrate of Rogers Duroid RT 5880 with relative permittivity of εr = 2.2 and tangent loss of δ = 0.0009. The proposed antenna system has a partial ground plane with two enhancement fractured slots. The design is characterized by a super-wide impedance starting from 15.2 to 62 GHz (a bandwidth of 46.8 GHz) and compact total system size of 11.2 × 15.25 mm2 with a thickness of 0.12 mm. The proposed MIMO design has omnidirectional radiation pattern for far field and the achieved peak gain reaches 13.5 dBi. The presented planar antenna which relies on computer aided design, has been designed and simulated using an industrial standard simulation code. Its performance results showed that the MIMO design is characterized by super wide bandwidth, omnidirectional radiation pattern, and high-power gain with miniaturized physical size; thus, it is suitable for radio-frequency identification (RFID) systems, fifth-generation applications, ultra-wideband systems, and others.

scholarly journals A Broadband Dual Circularly Polarized Compact Printed Monopole Antenna

2021 ◽  
Author(s):  
Rohit Kumar Saini
Keyword(s):  
Microstrip Line ◽  
Return Loss ◽  
Ground Plane ◽  
Axial Ratio ◽  
Monopole Antenna ◽  
Circularly Polarized ◽  
Antenna Performance ◽  
Printed Monopole Antenna ◽  
Printed Monopole ◽  
Better Than

Abstract A microstrip line –fed broadband dual circular polarized, two port printed monopole antenna is presented. The antenna consists of a ground plane with arrow shaped stub at the corner and a pair of inverted L-shaped feed lines. The 3dB axial ratio bandwidth of the antenna is about 58%(1.7GHz-3.1GHz) in which the return loss and isolation are better than 10dB and 12dB respectively. A parametric study of proposed antenna’s geometric parameters is given for understanding of the antenna performance. The realize gain, reflection coefficient (S 11 ) and transmission coefficient (S 21 ) are higher than 1, 10 and 12dB respectively within the entire axial ratio bandwidth (ARBW).

scholarly journals The Effect of a Single and Combined Slot Generated At the Upper and Lower Part of the Rectangular Patch Antenna Performances

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Adnan Affandi ◽  
Navin Kasim ◽  
Talal Hamdan Hamad Althebiani
Keyword(s):  
System Design ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Ground Plane ◽  
Antenna Feed ◽  
Feed Line ◽  
Rectangular Patch ◽  
Antenna Performance ◽  
Advanced System

<div><p><em>The paper investigates the effect of the slot made on the radiating plane (top) and ground plane individually and their effect when made on both the surfaces on the antenna performance. The paper further investigates effect of the slot on gain, frequency and radiation pattern made at different angles more specifically at angles of </em><em>0°,45° and 90° to the antenna feed line.</em></p><p><em>The antenna has been designed using advanced system design (ADS).</em></p></div>

scholarly journals RECONFIGURABLE MONOPOLE ANTENNA DESIGN BASED ON FRACTAL STRUCTURE FOR 5G APPLICATIONS

2021 ◽  
Vol 1 (1) ◽  
pp. 177-186
Author(s):  
Amna S. Kamel ◽  
Ali S. Jalal
Keyword(s):  
Resonant Frequency ◽  
Radiation Pattern ◽  
Fractal Structure ◽  
Ground Plane ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Pin Diodes ◽  
Antenna Performance ◽  
Design Structure ◽  
Specific Direction

 a reconfigurable antenna design for 5G applications is presented. It is based on monopole antenna and fractal structure. The design structure is consisted of (monopole) feedline, ground plane, L-shape reflector, fractal structure and PIN diodes. The antenna is printed on (25×29×1.6 mm3) FR-4 substrate of εr=4.3 and tanδ =0.001. The antenna shows a resonant frequency at 4.1 GHz with S11=-11.4 dB and Omni-direction pattern of 1.21 dB gain. The L-shaped reflector is used to maintain the radiation pattern in a specific direction. Moreover, the proposed fractal structure is found to operate as a circuit to give another resonant frequency and enhance the antenna performance. Where it is used to give more manipulation in the antenna performance including: frequency resonance and radiation patterns. The PIN-diodes are used to give many cases for more current manipulation. moreover, the authors used RF (50 SMA port) between monopole antenna and right side of ground plane to optimize directing radiation pattern and to eliminate the problems of interference between AC and DC current that produced from using PIN diode. This manipulation leads to change the resonant frequency and radiation pattern to the desired direction.So all parts are printed on a single side of FR4 substrate

scholarly journals Design of a SIW Variable Phase Shifter for Beam Steering Antenna Systems

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1013 ◽  
Author(s):  
Sara Salem Hesari ◽  
Jens Bornemann
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Phase Shifter ◽  
Beam Steering ◽  
Antenna System ◽  
Far Field ◽  
Cross Polarization ◽  
Varactor Diodes ◽  
Field Radiation ◽  
Better Than

This paper proposes a new beam steering antenna system consisting of two variable reflection-type phase shifters, a 3 dB coupler, and a 90° phase transition. The entire structure is designed and fabricated on a single layer of substrate integrated waveguide (SIW), which makes it a low loss and low-profile antenna system. Surface mount tuning varactor diodes are chosen as electrical phase control elements. By changing the biasing voltage of the varactor diodes in the phase shifter circuits, the far-field radiation pattern of the antenna steers from −25° to 25°. The system has a reflection coefficient better than −10 dB for a 2 GHz bandwidth centered at 17 GHz, a directive radiation pattern with a maximum of 10.7 dB gain at the mid-band frequency, and cross polarization better than 20 dB. A prototype is fabricated and measured for design verification. The measured far-field radiation patterns, co and cross polarization, and the reflection coefficient of the antenna system agree with simulated results.

scholarly journals A Dual-Band Dual-Antenna System with Common-Metal Rim for Smartphone Applications

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 348 ◽  
Author(s):  
Ziqiang Xu ◽  
Chenguang Ding ◽  
Qiangqiang Zhou ◽  
Yangtao Sun ◽  
Si Huang
Keyword(s):  
Resonant Frequency ◽  
Impedance Matching ◽  
Ground Plane ◽  
Antenna System ◽  
Dual Band ◽  
Efficiency Gain ◽  
Smartphone Applications ◽  
Metal Frame ◽  
System Operating ◽  
Better Than

A dual-antenna system operating at WIFI and GPS bands is proposed for common-metal rimmed smartphones applications. This dual-antenna system, which is horizontally placed on a ground plane of 4.5 × 75 mm2, consists of two folded inverted-F antennas (IFAs) sharing the same metal rim. Each IFA contains part of the metal radiating arm, and both IFAs own approximately one-quarter free space wavelengths at 2.44 GHz. A matching network is embedded in the feeding line of the left IFA to provide a resonant frequency at 1.575 GHz. By adjusting the positions of the shorting branch and feeding line, good impedance matching is obtained. Two gaps in the metal frame and a center shorting branch between two IFAs are adopted to improve the isolation. The isolations of better than 22 dB and 19 dB in GPS and WIFI bands are attained, respectively. The proposed antenna is fabricated, and the measured results regarding S-parameters, radiation efficiency, gain, as well as diversity performances are presented.

scholarly journals A Novel Ultrawideband Planar Inverted-F Antenna with Capacitive Ground Plane

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Haixia Liu ◽  
Fei Wang ◽  
Yang Yang ◽  
Xiaowei Shi ◽  
Long Li
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Free Space ◽  
Input Impedance ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Antenna Performance ◽  
Simulation Results ◽  
Metal Islands ◽  
Good Agreement

With the trend of the miniaturization, broadband, and integration of multisystems of wireless communication terminals, a new ultrawideband planar inverted-F antenna (PIFA) with capacitive ground plane is proposed in this paper. The capacitive ground plane is composed of a sheet of metal islands, which makes a major contribution to ultra-wideband from 2.3 GHz to 9.0 GHz by applying the capacitive compensation for input impedance of the PIFA in high-order modes frequency bands. The effect of geometric parameters of capacitive ground plane and antenna height on antenna performance is analyzed. It is found that the radiation pattern in free space and the gain of the proposed antenna also meet the demands of the wireless communication terminals. The reported antenna was fabricated and measured, and the experimental results are in good agreement with the simulation results.

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