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A miniaturized ultra‐wideband planar monopole antenna with L‐shaped ground plane stubs

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International Journal of RF and Microwave Computer-Aided Engineering
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Ming‐Tao Tan
Ming‐Tao Tan
Ming‐Tao Tan
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Jian‐Qi Li
Jian‐Qi Li
Jian‐Qi Li
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Zhi‐Yong Jiang
Zhi‐Yong Jiang
Zhi‐Yong Jiang
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Abstract and Figures

This article presents a miniaturized ultra‐wideband planar monopole antenna with an oval radiator. The proposed antenna is fed by a coplanar waveguide (CPW), and two L‐shaped stubs are extended from the ground plane of the CPW. This presented antenna is able to produce resonances in the lower frequency band and realize better impedance matching performance in the middle and higher frequency bands with the aid of the L‐shaped stubs. The antenna was built and tested. The total size of the proposed antenna is only 26 × 20 × 1.6 mm3. Its measured –10 dB impedance bandwidth is 10.1 GHz (3.1‐13.2 GHz). The measured far‐field radiation patterns are stable in the whole operating frequency band.
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RESEARCH ARTICLE
A miniaturized ultra-wideband planar monopole antenna with
L-shaped ground plane stubs
Ming-Tao Tan
1
| Jian-Qi Li
1
| Zhi-Yong Jiang
2
1
School of Computer and Electrical
Engineering, and Hunan Province
Cooperative Innovation Center for the
Construction and Development of Dongting
Lake Ecological Economic Zone, Hunan
University of Arts and Science, Changde,
China
2
Feng-An Electronic Technology Limited
Company of Changde, Changde, China
Correspondence
Ming-Tao Tan, School of Computer and
Electrical Engineering, and Hunan Province
Cooperative Innovation Center for the
Construction and Development of Dongting
Lake Ecological Economic Zone, Hunan
University of Arts and Science, Changde
415000, China.
Email: mingtaotan@163.com
Funding information
Hunan Provincial Natural Science
Foundation of China, Grant/Award
Numbers: 2019JJ60002, 2018JJ4015,
2018JJ2275; National Natural Science
Foundation of China, Grant/Award Number:
61761022; PhD Start-up Fund of Hunan
University of Arts and Science, Grant/Award
Number: 17BSQD06; Scientific Research
Fund of Hunan Provincial Education
Department, Grant/Award Number: 18B405
Abstract
This article presents a miniaturized ultra-wideband planar monopole antenna with
an oval radiator. The proposed antenna is fed by a coplanar waveguide (CPW), and
two L-shaped stubs are extended from the ground plane of the CPW. This pres-
ented antenna is able to produce resonances in the lower frequency band and real-
ize better impedance matching performance in the middle and higher frequency
bands with the aid of the L-shaped stubs. The antenna was built and tested. The
total size of the proposed antenna is only 26 × 20 × 1.6 mm
3
. Its measured –10 dB
impedance bandwidth is 10.1 GHz (3.1-13.2 GHz). The measured far-field radia-
tion patterns are stable in the whole operating frequency band.
KEYWORDS
L-shaped stub, monopole antenna, UWB antenna
1|INTRODUCTION
With the fast progress in electronic information technology,
communication bandwidth of electronic device is increased
from narrowband to broadband. Broadband communication,
having large communication capacity and fast communica-
tion speed, has important significance in modern society.
Since the Federal Communications Commission (FCC) has
authorized the unlicensed use of ultra-wideband (UWB,
3.1-10.6 GHz) for communication and localization applica-
tions in 2002,
1
UWB technology has received more and
more attention. UWB planar antennas are key components
in the UWB systems. Therefore, the planar antennas with
UWB performance are very useful.
UWB planar antennas are often realized using monopole
antennas due to their compact dimension and broadband per-
formance. The radiators of the planar monopole antennas
have different shapes. The rectangular, elliptical, and circu-
lar patches were used as radiators to obtain UWB perfor-
mance.
2-8
Slot antennas were also used to realize UWB
planar antennas.
9-12
In order to make the antennas be conve-
nient to integrate with circuit board, miniaturized UWB pla-
nar antennas are needed. In recent years, some miniaturized
UWB planar antennas were reported in literatures.
13-16
In
Received: 24 February 2019 Revised: 30 June 2019 Accepted: 7 August 2019
DOI: 10.1002/mmce.21935
Int J RF Microw Comput Aided Eng. 2019;29:e21935. wileyonlinelibrary.com/journal/mmce © 2019 Wiley Periodicals, Inc. 1of7
https://doi.org/10.1002/mmce.21935
... But the great emphasis is being given to planar antennas in academia because of their simple profile, cheapness, and ease of integration with microwave circuitries. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The easiest way to design a planar UWB antenna is to etch various slots in the radiator and ground. For example, a UWB slot antenna with a tapered design is described in Azim et al. 1 The design of the examined antenna consists of a tapered slot with a rectangular tuning stub and operates in the 3.0-11.20 ...
... The anticipated antenna, which had a total size of 25 Â 25 mm 2 , works over the 3.0 to 10.85 GHz band. In Tan et al., 13 a small monopole UWB antenna is reported, which consists of an elliptical-shaped patch with two ground stubs and worked over the 10.1 GHz bandwidth. Although many of the reported antennas achieve the UWB operating band, they have large sizes, have inconvenient shapes, or are challenging to construct, requiring the introduction of simpler miniaturized antennas. ...
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... A UWB monopole antenna with CPW feed and open ground stubs was presented in [4]. The antenna's operational band was 3.1-13.2 ...
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A super wideband coplanar waveguide-fed antenna is proposed for Microwave Imaging (MI) applications. The antenna comprising a slotted patch and a defected ground structure (DGS) loaded with a stub has been prototyped on a 1.6 mm thick glass-reinforced FR4 material with an εr of 4.4. The antenna has a size of 0.12λ0 × 0.12λ0 at the lowest operating frequency of 1.21 GHz. The slotted patch coupled well with the stub-loaded DGS in the ground plane and led the proposed antenna to obtain a range of operational bandwidth from 1.21 GHz to 24.66 GHz. Initially, with a rectangular patch, a super wideband antenna with five notch bands is achieved. To eliminate four notch bands and realize the super wideband two rectangular slots are etched in the patch. The last notch band is eliminated by loading the ground with a stub. To make the proposed antenna a compact space-saving one, the patch is fitted in a hexagonal slot etched in the ground. The experimental result reveals a super wideband performance of 181% (1.21 GHz–24.66 GHz) with a consistent radiation pattern and peak gain of 9.4 dB in a compact area of 30 mm².
View
... The study of more UWB antennas is considered to design the proposed antenna, and they are also suggested for the UWB frequency range. A compact planar antenna with a truncated ground plane and an expanded patch [1], an extra slot and top cutting edge in a ring -shaped structure in [2], Defective Ground Structure (DGS) in [3], a Ground plane with L shaped stub in [4], a microstrip line with a hexagonal ground plane in [5] have suggested various designs and techniques to cover UWB bandwidth. In order to obtain suitable isolation, two planar -monopole (PM) antenna components in [7] with a microstrip-fed printed on one side of the substrate is described with perpendicular to each other are explored in MIMO antenna. ...
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View
... Table 1 compares the performance of present antenna with other UWB monopole antennas. [1][2][3][4][5][6][7][8][9][10][11]13,14,[16][17][18][19][20][21] Refs. 1-11, 13 present various UWB monopole antennas. ...
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View
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A DGS-Loaded Compact Super Wideband Antenna for Microwave Imaging Application
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A super wideband compact antenna for Microwave Imaging (MI) is proposed. The antenna radiator is a truncated patch with slots and has a defected ground structure (DGS). The slots in the patch and truncation allowed the radiator to couple well with the partial ground plane loaded with DGS. This led to a super wide bandwidth of 25 GHz ranging from 5 to 30 GHz with a compact size of 0.27λ0 × 0.33λ0. Initially, with a truncated circular patch, a triple wideband antenna is achieved. To increase the impedance matching of the antenna and realise the super wideband, a circular ring slot has been etched in patch and ground is also truncated. To further enhance the bandwidth, slots in triangular shape are etched in the patch and a rectangular slot is etched in ground. The proposed antenna is a compact space-saving one. The results reveal a super wideband performance of 167% (5–30 GHz) with a consistent radiation pattern and peak gain of 10.2 dB in a compact area.KeywordsSuper widebandTruncated patchDefected ground structureSlotted patchRing slotPartial ground
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Coplanar waveguide-fed compact planar ultra-wideband antenna with inverted L-shaped and extended U-shaped ground for portable communication devices
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