High efficient dual band stacked antennas integrated into rescue helmets for indoor communication

2021 ◽  
pp. 1-6
Author(s):  
Hashinur Islam ◽  
Saumya Das ◽  
Tanushree Bose ◽  
Sourav Dhar
Keyword(s):  
Ground Plane ◽  
Small Dimension ◽  
Dual Band ◽  
Low Loss ◽  
Space Condition ◽  
Frequency Bands ◽  
Dielectric Layers ◽  
Feeding Technique ◽  
High Efficient ◽  
5 Ghz

Abstract A dual-band stacked antenna integrated with a rescue helmet is proposed for WLAN applications. The cross slot aperture feeding technique enables the antenna to support dual-band operation at 2.4 and 5 GHz. On the ground plane, two slots are formed, perpendicular to each other and of different lengths. Four dielectric layers of different permittivity are stacked over this cross slot to attain the desired frequency bands. Under free space condition, the radiator yields 7% (2.31–2.48 GHz), 15.87% (5.12–6 GHz) 10 dB return loss bandwidth (BW). The use of low loss dielectric layers on the slots also provides a high antenna efficiency and moderate gain at both frequency bands. The small dimension of antenna encourages its use as a wearable helmet antenna. Antenna performances are observed under wearable condition. For assessing human exposure to RF electromagnetic fields, SAR evaluations are conducted at both 2.4 and 5 GHz WLAN bands.

Evaluation of a dual-band long leaky coaxial cable in the 2.4 and 5 GHz frequency bands for wireless network access

2009 ◽  
Author(s):  
Masayuki Nakamura ◽  
Hideaki Takagi ◽  
Kiyoshi Einaga ◽  
Toshiyuki Nishikawa ◽  
Naoshi Moriyama ◽  
...  
Keyword(s):  
Wireless Network ◽  
Coaxial Cable ◽  
Dual Band ◽  
Network Access ◽  
Frequency Bands ◽  
5 Ghz

scholarly journals Design of a MIMO Antenna with High Gain and Enhanced Isolation for WLAN Applications

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1659
Author(s):  
He Peng ◽  
Ruixing Zhi ◽  
Qichao Yang ◽  
Jing Cai ◽  
Yi Wan ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Correlation Coefficients ◽  
Local Area ◽  
High Gain ◽  
Dual Band ◽  
Area Network ◽  
Frequency Bands ◽  
Mimo Antenna

A multi-input multi-output (MIMO) antenna for wireless local area network (WLAN) applications operating in 2.4 GHz and 5.8 GHz frequency bands is proposed in this paper. The proposed dual-band MIMO antenna is composed of two symmetrical radiation elements, and the isolation performance is improved by adopting parasitic elements and a defective ground plane. The measured reflection coefficients are less than −10 dB in the bandwidth range of 2.12–2.8 GHz and 4.95–6.65 GHz, respectively. The measurements show excellent isolation of −21 dB and −15 dB in both desired frequency bands, respectively. The total peak gain is greater than 4.8 dBi. The calculated envelope correlation coefficients (ECC), based on the measured S-parameters, are smaller than 0.01 and 0.024 in the lower and higher frequency bands, respectively. The dimension of the presented antenna occupies 50 × 40 × 1.59 mm3. It is suitable for IEEE 802.11 a/b/g/n (2.4–2.4835 GHz, 5.15–5.35 GHz and 5.725–5.85 GHz) WLAN applications.

Compact ACS-fed antenna with DGS and DMS for WiMAX/WLAN applications

2015 ◽  
Vol 8 (7) ◽  
pp. 1095-1100 ◽  
Author(s):  
Kalikuzhackal Abbas Ansal ◽  
Thangavelu Shanmuganantham
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Local Area ◽  
Circuit Board ◽  
Dual Band ◽  
Area Network ◽  
Defected Ground Structure ◽  
Feeding Technique ◽  
Microstrip Structure

A novel compact asymmetric coplanar strip fed planar antenna with defected ground structure and defected microstrip structure for dual band application is presented. The proposed antenna is composed of defect in both ground plane and radiating strip. The antenna has an overall dimension of 21 × 15.35 × 1.6 mm3when printed on a substrate with dielectric constant of 4.4 and loss tangent of 0.02. The antenna resonating at two different frequencies of 3.5 and 5.5 GHz is coveringworldwide interoperability microwave access and wireless local area network bands. The planar design, simple feeding technique, and compactness make it easy for the integration of the antenna into the circuit board. Details of the antenna design, simulated, and experimental results are presented and discussed. Simulation tool, based on the method of moments (Mentor Graphics IE3D version 15.10) has been used to analyze and optimize the antenna.

scholarly journals Dual-band Bisected Psi Antenna for 3G, Wi-Fi, WLAN and Wi-MAX Applications

2020 ◽  
Vol 1 ◽  
pp. 56-61
Author(s):  
Penchala Reddy Sura ◽  
S. Narayana Reddy
Keyword(s):  
Microstrip Line ◽  
Ground Plane ◽  
The Other ◽  
Dual Band ◽  
Frequency Bands ◽  
Distinct Frequency

This paper presents an inexpensive and simple dual-band bisected psi antenna for 3G, Wi-Fi, WLAN, and WiMAX applications is presented. The antenna comprises a bisected psi-shaped patch on a low-price FR4 substrate with a cropped ground plane on the other side, and is fed by a 50 Ω microstrip line. It operates at two distinct frequency bands of 1.87–2.76 GHz and 5.16–5.75 GHz with |S11|≤ -10 dB

scholarly journals Compact Planar Inverted F Antenna (PIFA) for Smart Wireless Body Sensors Networks

2020 ◽  
Vol 2 (1) ◽  
pp. 63
Author(s):  
Mohammad Monirujjaman Khan ◽  
Tabia Hossain
Keyword(s):  
Sensor Networks ◽  
Human Body ◽  
Wearable Sensors ◽  
Ground Plane ◽  
Dual Band ◽  
Body Sensor Networks ◽  
Performance Parameters ◽  
Frequency Bands ◽  
Body Tissues ◽  
Compact Size

In this paper a dual band, a dual band Planar Inverted F antenna (PIFA) is designed for wireless communication intended to be used in wireless body sensor networks. The designed PIFA operates at two different frequency bands, 2.45 GHz Industrial, Scientific and Medical band (ISM) and 5.2 GHz (HiperLAN band). In body-centric wireless networks, antennas need to be integrated with wireless wearable sensors. An antenna is an essential part of wearable body sensor networks. For on-body communications, antennas need to be less sensitive to human body effects. For body-centric communications, wearable devices need to communicate with the devices located over the surface, and there is a need of communication from on-body devices to off-body units. Based on this need, a dual band planar inverted F antenna is designed that works at two different frequency bands, i.e., 2.45 GHz and 5.2 GHz. The 2.45 GHz is proposed for establishing communication among the wireless sensor devices attached to the human body, while 5.2 GHz is proposed for the communications for from on-body to off-body devices. The proposed antenna is very compact, and due to having ground plane at the backside it is less sensitive to the effects of the human body tissues. Computer Simulation Technology (CST) microwave studio™ was used for antenna design and simulation purposes. Performance parameters such as return loss, bandwidth, radiation pattern and efficiency of this antenna are shown and investigated. These performance parameters of the proposed antenna have been investigated at free space and close proximity to the human body. Simulation results and analysis show that the performance parameters produce very good results for both frequency bands. Due to its compact size, low sensitivity to human body tissues, and dual band functionality, it will be a good candidate for wireless wearable body sensor networks.

Dual Band Paper Substrate CPW Antenna for Wireless Applications

2019 ◽  
Vol 8 (9S3) ◽  
pp. 605-608
Keyword(s):  
Reflection Coefficient ◽  
Mobile Communication ◽  
Coplanar Waveguide ◽  
Dual Band ◽  
Antenna Feed ◽  
Paper Substrate ◽  
Frequency Bands ◽  
Wireless Applications

In this paper, a 15* 80 sized antenna is designed over a paper substrate to test its flexible properties. The proposed antenna feed by a grounded coplanar waveguide(GCPW) is stimulated and the measured results show the operating Dual Band of the antenna cover(3.34-3.62 GHz) and (5.92-6.24 GHz) with the reflection coefficient |S11|< -15dB.These frequency bands operate over SHF bands and hence supports Fixed Mobile Communication and WLAN applications.

A Novel Pentagonal Shaped Planar Inverted-F Antenna for Defense Applications

2019 ◽  
Vol 12 (2) ◽  
pp. 95-100
Author(s):  
Purnima Sharma ◽  
Akshi Kotecha ◽  
Rama Choudhary ◽  
Partha Pratim Bhattacharya
Keyword(s):  
Mobile Communication ◽  
Satellite Communication ◽  
Dual Band ◽  
Vehicular Communication ◽  
Radio Frequency Field ◽  
Wireless Applications ◽  
High Frequency Structure Simulator ◽  
Low Profile ◽  
Radar Satellite ◽  
5 Ghz

Background: The Planar Inverted-F Antenna (PIFA) is most widely used for wireless communication applications due to its unique properties as low Specific Absorption Rate, low profile geometry and easy fabrication. In literature a number of multiband PIFA designs are available that support various wireless applications in mobile communication, satellite communication and radio frequency field. Methods: In this paper, a miniature sized planar inverted-F antenna has been proposed for dual-band operation. The antenna consists of an asymmetrical pentagonal shaped patch over an FR4 substrate. The overall antenna dimension is 10 × 10 × 3 mm3 and resonates at 5.7 GHz frequency. A modification is done in the patch structure by introducing an asymmetrical pentagon slot. Results: The proposed pentagonal antenna resonates at 5.7 GHz frequency. Further, modified antenna resonates at two bands. The lower band resonates at 5 GHz and having a bandwidth of 1.5 GHz. This band corresponds to C-band, which is suitable for satellite communication. The upper band is at 7.9 GHz with a bandwidth of 500 MHz. Performance parameters such as return loss, VSWR, input impedance and radiation pattern are obtained and analysed using ANSYS High- Frequency Structure Simulator. The radiation patterns obtained are directional, which are suitable for mobile communication. Conclusion: The antenna is compact in size and suitable for radar, satellite and vehicular communication.

scholarly journals Realizing UWB Antenna Array with Dual and Wide Rejection Bands Using Metamaterial and Electromagnetic Bandgaps Techniques

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 269
Author(s):  
Ayman A. Althuwayb ◽  
Mohammad Alibakhshikenari ◽  
Bal S. Virdee ◽  
Pancham Shukla ◽  
Ernesto Limiti
Keyword(s):  
Antenna Array ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Dual Band ◽  
Area Network ◽  
Electromagnetic Bandgap ◽  
Uwb Antenna ◽  
Average Gain ◽  
Left Handed ◽  
Notched Band

This research article describes a technique for realizing wideband dual notched functionality in an ultra-wideband (UWB) antenna array based on metamaterial and electromagnetic bandgap (EBG) techniques. For comparison purposes, a reference antenna array was initially designed comprising hexagonal patches that are interconnected to each other. The array was fabricated on standard FR-4 substrate with thickness of 0.8 mm. The reference antenna exhibited an average gain of 1.5 dBi across 5.25–10.1 GHz. To improve the array’s impedance bandwidth for application in UWB systems metamaterial (MTM) characteristics were applied it. This involved embedding hexagonal slots in patch and shorting the patch to the ground-plane with metallic via. This essentially transformed the antenna to a composite right/left-handed structure that behaved like series left-handed capacitance and shunt left-handed inductance. The proposed MTM antenna array now operated over a much wider frequency range (2–12 GHz) with average gain of 5 dBi. Notched band functionality was incorporated in the proposed array to eliminate unwanted interference signals from other wireless communications systems that coexist inside the UWB spectrum. This was achieved by introducing electromagnetic bandgap in the array by etching circular slots on the ground-plane that are aligned underneath each patch and interconnecting microstrip-line in the array. The proposed techniques had no effect on the dimensions of the antenna array (20 mm × 20 mm × 0.87 mm). The results presented confirm dual-band rejection at the wireless local area network (WLAN) band (5.15–5.825 GHz) and X-band satellite downlink communication band (7.10–7.76 GHz). Compared to other dual notched band designs previously published the footprint of the proposed technique is smaller and its rejection notches completely cover the bandwidth of interfering signals.

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