A flexible broadband antenna for IoT applications

2020 ◽  
Vol 12 (6) ◽  
pp. 531-540 ◽  
Author(s):  
Abdullah Al-Sehemi ◽  
Ahmed Al-Ghamdi ◽  
Nikolay Dishovsky ◽  
Gabriela Atanasova ◽  
Nikolay Atanasov
Keyword(s):  
Flexible Substrate ◽  
Coplanar Waveguide ◽  
Radiation Efficiency ◽  
Woven Fabric ◽  
Impedance Bandwidth ◽  
Minor Effect ◽  
Broadband Antenna ◽  
Iot Applications ◽  
Antenna Performance ◽  
A Minor

AbstractA flexible broadband antenna with high radiation efficiency for the Internet of Things (IoT) applications is presented. The design is based on a U-shaped and a triangular-shaped radiator with two tuning stubs. A 50 Ω coplanar waveguide (CPW) transmission line is employed to feed the antenna. The proposed antenna is fabricated on a flexible substrate from a composite synthesized by mixing natural rubber with SiO2 as a filler. The radiating elements, along with the CPW, are built using a highly conductive woven fabric. Results show that the antenna has a simulated and measured impedance bandwidth of 0.856–2.513 GHz and covers the most commonly used wireless communication standards and technologies for IoT applications. The radiation efficiency of the antenna reaches over 75% throughout the operating frequency band with satisfactory radiation patterns and gain. The flexible antenna was also tested under bending conditions. The presented results demonstrate that bending has a minor effect on the antenna performance within the target frequency range. The measured results show a good agreement with simulations.

scholarly journals Balance Analysis of Microstrip-to-CPS Baluns and Its Effects on Broadband Antenna Performance

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Dong Sik Woo ◽  
Young-Ki Cho ◽  
Kang Wook Kim
Keyword(s):  
Delay Line ◽  
Phase Delay ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Broadband Antenna ◽  
Coplanar Stripline ◽  
Antenna Performance ◽  
Yagi Antenna ◽  
Balance Analysis ◽  
Operating Bandwidth

Amplitude and phase balances of two types of microstrip-(MS-) to-coplanar stripline (CPS) baluns have been analyzed through simulations and measurements, and their effects on broadband antenna performance are investigated. The impedance bandwidth of the balun determined by a back-to-back configuration can sometimes overestimate the balun operating bandwidth. With the conventional balun with a 180° phase delay line, it is observed that the balun balance over the operating frequencies becomes much more improved as the CPS length increases to over 0.1 λg. As compared with the conventional balun, the proposed MS-to-CPS balun demonstrated very wideband performance from 5 to over 20 GHz. With the proposed balun, amplitude and phase imbalances are within 1 dB and ±5°, respectively. Effects of the balun imbalance on overall broadband antenna performance are also discussed with a quasi-Yagi antenna and a narrow beamwidth tapered slot antenna (TSA).

Gain enhancement of wideband circularly polarized antenna using FSS

2016 ◽  
Vol 9 (3) ◽  
pp. 697-703 ◽  
Author(s):  
Nagendra Kushwaha ◽  
Raj Kumar
Keyword(s):  
Coplanar Waveguide ◽  
Axial Ratio ◽  
Frequency Selective Surface ◽  
High Gain ◽  
Unit Element ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Gain Enhancement ◽  
Antenna Performance ◽  
Measured Impedance

This paper presents a high gain, wideband circularly polarized (CP) antenna. High gain of the antenna is achieved by employing a frequency selective surface (FSS) as a reflector. The antenna is a coplanar waveguide-fed structure with a modified L-shaped radiating patch. The unit element of the FSS is formed by connecting two modified dipoles at an angle of 90°. The antenna with reflector has a measured impedance bandwidth of 74.3% (2.2–4.8 GHz) and a 3-dB axial ratio bandwidth (ARBW) of 62% (2.2–4.18 GHz). The maximum boresight gain of the proposed antenna with reflector is 7.1 dB at 3.4 GHz. The radiation patterns of the antenna with the FSS are also measured and compared with simulated patterns. The various aspects of effect of FSS on CP antenna performance are also discussed.

scholarly journals A Circular Coplanar Waveguide Fed Microstrip Patch Antenna with Modified Triangular Ground for UWB Applications

2019 ◽  
Vol 8 (9S) ◽  
pp. 170-174
Keyword(s):  
Patch Antenna ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Stop Band ◽  
Microstrip Patch Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Antenna Structure ◽  
Microstrip Patch ◽  
Antenna Performance

This research article gives a detailed insight of the design, simulation of a compact circular shaped microstrip patch antenna that is fed using a coplanar waveguide feed (CPW for practical wireless communication applications). The antenna is typically designed for Ultra wideband (1.46-6GHz), Bluetooth (2.4GHz), ZIGBEE (2.4GHz), WLAN (5.15- 5.35 GHz and 5.725- 5.825), Wi-Fi (2.4-2.485GHz) and HIPERLAN-2(5.15 - 5.35 GHz and 5.470 -5.725GHz) wireless applications with stop band characteristics for the H (partial C band). The proposed antenna has an overall packaged structure dimensions of 78 x75 x1.605 mm3 and is fabricated on FR4 substrate as a circular patch antenna with a coplanar ground .The commercially available laminate FR4 substrate that is used has a dielectric constant of 4.4, height of 1.6mm and a loss tangent of 0.0024.The prospective antenna shows a simulated impedance bandwidth of 4.54 GHz. The coplanar waveguide feeding used with this antenna helps in improving antenna performance in terms of its impedance bandwidth as this geometry helps in creating multiple current loops at the antenna structure, thereby exciting nearby frequencies that merge to show a broadband of operation. The antenna’s operational bandwidth is also improved by the concept of modified ground, in which triangular and rectangular shapes are added symmetrically on both sides of ground plane that provide a better fringing effect and hence an improved bandwidth.

scholarly journals FULLY TRANSPARENT METAMATERIAL AMC BACKED CPW FED MONOPOLE ANTENNA FOR IOT APPLICATIONS

2021 ◽  
Vol 59 (5) ◽  
Author(s):  
Cong Danh Bui ◽  
Arpan Desai ◽  
Thi Thanh Kieu Nguyen ◽  
Truong Khang Nguyen
Keyword(s):  
Planar Waveguide ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Magnetic Conductor ◽  
Iot Applications ◽  
Antenna Performance ◽  
Measurement Results ◽  
Conductive Oxide ◽  
Peak Gain

In this paper, a fully transparent antenna comprising of an Artificial Magnetic Conductor (AMC) backed Co-planar Waveguide (CPW) fed dual-ring monopole is presented. The monopole antenna and AMC structure achieve transparency due to the use of AgHT-8 conductive oxide and Plexiglas substrate. Measured antenna performance shows an impedance bandwidth of 5.3 – 6 GHz (12.4%) in the U-NII-1 to U-NII-4 frequency band with a peak gain of 5.7 dBi which is approximately an increase of 4.5% and 3.9 dBi, respectively, as compared to the standalone antenna. The simulation and the measurement results agree well with each other which proves the validity of the proposed design. To the best of our knowledge, the proposed antenna is the first fully transparent antenna design combining a transparent radiator and a transparent AMC structure.

scholarly journals Coplanar Waveguide-Fed Bidirectional Same-Sense Circularly Polarized Metasurface-Based Antenna

2021 ◽  
Vol 21 (3) ◽  
pp. 210-217
Author(s):  
Cho Hilary Scott Nkimbeng ◽  
Heesu Wang ◽  
Ikmo Park
Keyword(s):  
Reflection Coefficient ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Radiation Efficiency ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Circularly Polarized ◽  
Feed Line

This paper presents the design of a bidirectional same-sense circularly polarized (CP) antenna that uses metasurfaces. The antenna consists of two metasurfaces, each comprising an array of 2 × 4 corner truncated patches placed back-to-back on the top and bottom of the antenna. In addition, a ground plane with an etched slot is sandwiched between the substrates at the front and back, and the feed line is a 50 Ω coplanar waveguide. The antenna radiates same-sense right-handed CP waves in both the front and back directions and has overall dimensions of 48 mm × 24 mm × 3.048 mm (0.91λo × 0.45λo × 0.05λo at 5.7 GHz). The measured reflection coefficient for |S11| < -10 dB yields an impedance bandwidth of 5.21–6.26 GHz (18.4%) and an axial ratio (AR) bandwidth of 5.36–6 GHz (11.2%) for both front and back directions. The antenna gain is 3–5.29 dBic for both directions and has a radiation efficiency of >96% within its AR bandwidth.

EFFECT OF CPW EDGES CHAMFERING TO THE PERFORMANCE OF ULTRA WIDEBAND ANTENNA

2015 ◽  
Vol 77 (10) ◽  
Author(s):  
Raimi Dewan ◽  
Mohamad Kamal A Rahim ◽  
Mohamad Rijal Hamid ◽  
M.H. Mokhtar ◽  
M.F.M. Yusoff
Keyword(s):  
Coplanar Waveguide ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Reflection Coefficients ◽  
Antenna Gain ◽  
Fractional Bandwidth ◽  
Uwb Antenna ◽  
Antenna Performance ◽  
Feeding Technique

In this paper, an Ultra Wideband (UWB) antenna is presented. The antenna radiating patch is circular in shape with coplanar waveguide (CPW) feeding technique. The proposed chamfering to the outer edges of the ground plane successfully widens the -10 dB impedance bandwidth of the antenna to cover from 1.92 GHz up to 15.16 GHz (correspond to 155% fractional bandwidth). The antenna gain varies from 2 to 5 dB over the operating band. Parametrical studies have been conducted for four different conditions of the ground plane; without chamfering, chamfering on the inner edges, chamfering on the outer edges and both chamfering of inner and outer edges. The effects of distinguished chamfering conditions to antenna performance are analyzed.  The measured and simulated results for reflection coefficients and radiation patterns (2.45 GHz, 3.5 GHz and 5.8 GHz) are presented. The corresponding realized gains are 2.14 dB, 2.85 dB and 3.4 dB respectively. The measured results satisfactorily agreed with the simulated ones. The antenna is 8 - 37 % wider bandwidth than previous research.

Double-ring multiband microstrip patch antenna with parasitic strip structure for heterogeneous wireless communication systems

2017 ◽  
Vol 9 (8) ◽  
pp. 1757-1762
Author(s):  
Geetanjali Singla ◽  
Rajesh Khanna
Keyword(s):  
Communication Systems ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Coplanar Waveguide ◽  
Local Area ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Double Ring ◽  
Rectangular Patch ◽  
Antenna Performance

In this paper, a novel design of compact Coplanar Waveguide-fed planar monopole antenna with enhanced bandwidth and multiband characteristics has been proposed. Two rectangular rings have been incorporated in a rectangular patch to obtain multiband operation for Wireless Local Area Network (WLAN) (2.4/5.2/5.8 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) (2.3/2.5/5.5 GHz) bands. A parasitic strip and meandering along with double-ringed structure have been used to achieve enhanced impedance bandwidth in WLAN (from 2.26 to 3.03 GHz) and WiMAX (from 4.48 to 6.85 GHz) bands. The parametric analysis is carried out to study effect of varying dimensions on antenna performance. The proposed antenna is optimized and prototype is designed and fabricated. Simulated and measured radiation patterns in elevation and azimuthal planes are also observed. The antenna shows significant gain of 7.33 dBi at 6.54 GHz frequency.

scholarly journals CPW-Fed Flexible Ultra-Wideband Antenna for IoT Applications

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 453
Author(s):  
Sharadindu Gopal Kirtania ◽  
Bachir Adham Younes ◽  
Abdul Rakib Hossain ◽  
Tutku Karacolak ◽  
Praveen Kumar Sekhar
Keyword(s):  
High Frequency ◽  
Return Loss ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Iot Applications ◽  
Good Agreement

In this article, an inkjet-printed circular-shaped monopole ultra-wideband (UWB) antenna with an inside-cut feed structure was implemented on a flexible polyethylene terephthalate (PET) substrate. The coplanar waveguide (CPW)-fed antenna was designed using ANSYS high-frequency structural simulator (HFSS), which operates at 3.04–10.70 GHz and 15.18–18 GHz (upper Ku band) with a return loss < −10 dB and a VSWR < 2. The antenna, with the dimensions of 47 mm × 25 mm × 0.135 mm, exhibited omnidirectional radiation characteristics over the entire impedance bandwidth, with an average peak gain of 3.94 dBi. The simulated antenna structure was in good agreement with the experiment’s measured results under flat and bending conditions, making it conducive for flexible and wearable Internet of things (IoT) applications.

A compact elevated CPW-fed antenna with slotted ground plane for wideband applications

2017 ◽  
Vol 9 (10) ◽  
pp. 2005-2011 ◽  
Author(s):  
Reeta Devi ◽  
Dipak KR. Neog
Keyword(s):  
Coplanar Waveguide ◽  
Ground Plane ◽  
Radiation Characteristic ◽  
Impedance Bandwidth ◽  
Antenna Performance ◽  
Measured Radiation ◽  
Compact Size ◽  
Operating Bandwidth ◽  
Good Agreement

In this paper, a miniaturized elevated-coplanar-waveguide-fed antenna with a slotted ground plane is proposed. This antenna has a compact size of 25 mm × 25 mm × 1.6 mm where the ground plane is reduced by etching a trapezoidal slot along with two extended slits. A −10 dB wide-impedance bandwidth of 126% ranging from 2.8 to 12.4 GHz is achieved for the proposed antenna. The proposed antenna is successfully manufactured and experimentally investigated. The measurement shows a good agreement with the simulation. The measured radiation characteristic shows a stable and nearly omnidirectional pattern over the operating bandwidth region. The effects of various parameters on the antenna performance are analyzed and discussed as well.

A compact CPW-fed wideband metamaterial-inspired antenna for GSM, WLAN/Wi-Fi, and WiMAX applications

2016 ◽  
Vol 9 (3) ◽  
pp. 567-571 ◽  
Author(s):  
Ashish Gupta ◽  
Raghvendra Kumar Chaudhary
Keyword(s):  
Transmission Line ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Radiation Efficiency ◽  
Asymmetric Structure ◽  
Impedance Bandwidth ◽  
Radiation Characteristics ◽  
Average Gain ◽  
Lumped Parameters

A compact coplanar waveguide (CPW)-fed wideband metamaterial-inspired antenna is designed and developed in this paper. The proposed structure is an asymmetric structure in which three rectangular stubs are employed between signal patch and CPW ground plane. It is demonstrated that these stubs provides lumped parameters of conventional epsilon-negative transmission line (ENG-TL). As an advantage of these stubs proposed antenna operates on 1.67–2.76 GHz with −10 dB impedance bandwidth of 49.2%. The proposed antenna having small electrical size of 0.17λ0 × 0.35λ0 × 0.01λ0 at fo = 2.21 GHz. The simulated average gain and radiation efficiency of the proposed antenna is 1.61 dB and 96.33% respectively throughout the bandwidth. Properties such as smaller electrical size, simpler design, consistent radiation characteristics, and ease of fabrication are making this antenna suitable for GSM, WLAN/Wi-Fi, Bluetooth, and WiMAX applications.

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