scholarly journals Effect of small wearable device antenna location on its impedance, bandwidth potential and radiation efficiency

2017 ◽  
Author(s):  
J. Chen ◽  
M. Berg ◽  
H.Y. Amin ◽  
A. Pärssinen
Keyword(s):  
Radiation Efficiency ◽  
Wearable Device ◽  
Impedance Bandwidth ◽  
Antenna Location

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 A Cylindrical Dielectric Resonator Antenna-Coupled Sensor Configuration for 94 GHz Detection

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
M. Kamran Saleem ◽  
M. Abdel-Rahman ◽  
Majeed Alkanhal ◽  
Abdelrazik Sebak
Keyword(s):  
Millimeter Wave ◽  
Dielectric Resonator ◽  
Radiation Efficiency ◽  
Center Frequency ◽  
Dielectric Resonators ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Dielectric Resonator Antenna ◽  
Wave Detection ◽  
Sensor Configuration

A novel antenna-coupled sensor configuration for millimeter wave detection is presented. The antenna is based on two cylindrical dielectric resonators (CDRs) excited by rectangular slots placed below the CDRs. TheHEM11Δmode resonating at 94 GHz is generated within the CDRs and a 3 GHz impedance bandwidth is achieved at center frequency of 94 GHz. The simulated antenna gain is 7.8 dB, with a radiation efficiency of about 40%.

Compact CPW-fed super wideband planar elliptical antenna

2020 ◽  
pp. 1-8
Author(s):  
Umair Rafique ◽  
Sami ud Din ◽  
Hisham Khalil
Keyword(s):  
Reasonable Agreement ◽  
Radiation Efficiency ◽  
Impedance Bandwidth ◽  
Average Gain ◽  
Feed Line ◽  
Radiation Properties ◽  
Operating Bandwidth ◽  
Simulation Results ◽  
Ring Shaped Structure ◽  
Microstrip Feed

Abstract A compact co-planar waveguide (CPW) fed planar elliptical antenna has been designed and presented for super wideband (SWB) characteristics. The designed antenna has an overall size of 30 × 30 × 1.57 mm3, and it consists of an elliptical patch radiator fed using a modified 50 Ω CPW-fed tapered microstrip feed line. By using a semi-ring shaped structure with a tapered feed line, an impedance bandwidth of 180.66% has been observed from 1.27 to 25 GHz with a ratio bandwidth of 19.68:1. To validate simulation results, the designed antenna has been fabricated and measured, and a reasonable agreement has been observed between simulated and measured results. It has also been observed that the designed antenna offers good radiation properties over the entire operating bandwidth. The simulated average gain and radiation efficiency of the proposed SWB antenna is noted to be 4.3 dBi and 95.77%, respectively; while the measured average gain and radiation efficiency is 3.8 dBi and 94.69%, respectively.

Design of low profile co-axial fed high gain stacked patch antenna for Wi-Fi/WLAN/Wi-Max applications

Frequenz ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gnanasivam Pachaiyappan ◽  
Parthasarathy Ramanujam
Keyword(s):  
Bottom Layer ◽  
High Gain ◽  
Base Station ◽  
Radiation Efficiency ◽  
Impedance Bandwidth ◽  
Simple Design ◽  
Low Profile ◽  
Parasitic Patch ◽  
Mobile Base Station ◽  
Mobile Base

AbstractIn this article, a simple design of stacked radiating system with enhanced gain, impedance bandwidth, and radiation efficiency for mobile base station application is presented. The proposed antenna consists of a driven patch with a semicircular parasitic patch printed on the bottom layer and five parasitic patches printed on the top layer. The driven patch is feed by a co-axial probe and both the layers are separated in air. The second layer has four truncated circular parasitic patches on one side and one circular patch on the other side to enhance the directive gain acts as a directive reflector. This staked system encompasses some prominent features such as wide bandwidth, good gain, low profile, better radiation efficiency simple design, and integration for the mobile base station. Meanwhile, this configuration exhibits a bandwidth of 2 GHz with the minimized volume is 0.75 λ0 × 0.75 λ0 × 0.08 λ0. Experimentally validated results have an average and peak gain of 10.7 and 12.7 dBi, impedance bandwidth of more than 30.7% for |S11| < −10 dB, and radiation efficiency of above 86%. The proposed stacked radiating system finds its applications in Wi-Fi, WLAN, Wi-Max, Indoor UWB, and Marine Radar applications.

scholarly journals The Radiation Efficiency Change according to the Slot Antenna Location

2014 ◽  
Vol 25 (4) ◽  
pp. 381-386 ◽  
Author(s):  
Ji-Hwan Jeon ◽  
Yang Liu ◽  
Jae-Seok Lee ◽  
Hyeong-Dong Kim
Keyword(s):  
Radiation Efficiency ◽  
Slot Antenna ◽  
Efficiency Change ◽  
Antenna Location

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.

scholarly journals A Dual Band Patch Antenna with a Pinwheel-Shaped Slots EBG Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Zhaopeng Teng ◽  
Zhiqing Liu ◽  
Bincheng Li
Keyword(s):  
Patch Antenna ◽  
High Frequency ◽  
Coaxial Line ◽  
Microstrip Patch Antenna ◽  
Radiation Efficiency ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Planar Antennas ◽  
Microstrip Patch ◽  
Full Wave

A dual band microstrip patch antenna integrated with pinwheel-shaped electromagnetic band-gap (EBG) structures is proposed. The patch antenna consists of a pair of spiral slots on the patch and is fed by using coaxial line. Its full-wave simulation predicts dual bands from 4.43 GHz to 4.56 GHz and from 4.96 GHz to 5.1 GHz in the C-band. The designed EBG with eight pinwheel-shaped slots addresses smaller frequency drift compared with the traditional square mushroom-like EBG when applied to the patch antenna. With the help of designed EBG structure, the impedance bandwidth, radiation efficiency, and gain of the patch antenna are improved significantly. The 10 dB impedance bandwidth is extended by 3.4% and 6.5% at the low- and high-frequency bands, respectively. The radiation efficiency is increased by 5% and 17.8%, and the realized gain is enhanced by 1.87 dB and 1.56 dB at 4.57 GHz and 5.06 GHz, respectively. The designed EBG structure may have many applications in other types of planar antennas.

scholarly journals A Miniaturized Broadband and High Gain Planar Vivaldi Antenna for Future Wireless Communication Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Permanand Soothar ◽  
Hao Wang ◽  
Chunyan Xu ◽  
Yu Quan ◽  
Zaheer Ahmed Dayo ◽  
...  
Keyword(s):  
Wireless Communication ◽  
High Gain ◽  
Radiation Efficiency ◽  
Impedance Bandwidth ◽  
Strip Line ◽  
Antenna Structure ◽  
Delay Performance ◽  
Field Radiation ◽  
Vivaldi Antenna ◽  
The Time Domain

This paper presents a new miniaturized planar Vivaldi antenna (PVA) design. The proposed antenna structure consists of an aperture tapered profile and cavity stub fed with a simple 50 Ω strip line feeding network. The designed PVA offers versatile advantages, including the miniaturized size and simple design, and exhibited an outstanding performance compared to the latest reported literature. The antenna occupies a minimal space with an electrical size of 0.92λ0 × 0.64λ0 × 0.03λ0. The antenna achieves an excellent relative impedance bandwidth 117.25% at 10 dB return loss, peak realized gain of 10.9 dBi, and an excellent radiation efficiency of 95% at the specific resonances. The antenna’s optimal features, that is, broadband, high gain, and radiation efficiency, are achieved with efficient grooves based approach. Besides, the proposed antenna results are also analyzed in the time domain, which shows the excellent group delay performance <2 ns in the operational band. The proposed antenna exhibited a stable far-field radiation pattern in orthogonal planes and strong distribution of current at multiple resonances. Simulation and the measured result show a good agreement. The proposed antenna has achieved optimal performance and is suitable for future wireless communication applications.

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