scholarly journals Design of Unlicensed Dual Band Quasi-Yagi Antenna Using Semi-Bowtie for Indoor Wireless Power Transfer Application

2021 ◽  
pp. 535-544
Author(s):  
Mohd Hezri Abdullah ◽  
◽  
Arjuna Marzuki ◽  
Mohd Tafir Mustaffa
Keyword(s):  
Power Management ◽  
Phase Shifter ◽  
Low Cost ◽  
Dual Band ◽  
Wireless Power ◽  
Frequency Range ◽  
Physical Size ◽  
Operating Frequency Range ◽  
Yagi Antenna ◽  
Indoor Wireless

This paper focuses on antenna for harvesting energy from a dedicated transmitter. The potential novel quasi-Yagi antenna with semi-bowtie driven element can be used as part of rectenna due to its characteristic of having directional properties and considerably wide bandwidth covering the Industrial, Scientific, and Medical (ISM) band consists of 863-870 MHz band and 902-928 MHz band. The modified quasi-Yagi is designed on a low-cost FR4 substrate with a physical size of 130 x 100 mm2 equivalent to 0.35λo x 0.27λo. The antenna has a peak directivity of 2.7 dBi and peak gain of 2.2 dBi in the targeted unlicensed bands with bandwidth of 14.4% for the range between 0.820-0.944 GHz. The shift in the resonant frequency is achieved by varying the phase shifter length and maintaining the same width for consistency. The antenna's operating frequency range varies between 0.8 GHz until 1 GHz which is less than 1 GHz by using semi-bowtie as driven element with a specific 7.22⸰ flare angle. The phase shift arm length of the antenna has been studied and simulated by using Computer Simulation Technology (CST) software and verified by using analytical equations. The simulated results are in accordance with the results obtained using analytical method. The same antenna geometry except variation in phase shifter arm length has been used throughout the study for consistency. The proposed antenna is promising to be used as part of rectenna for powering power management chip such as BQ25570 in a smart house environment operating at the indicated ISM bands.

DUAL BAND SECTORIAL SLOT PAC-MAN ANTENNA BY USING POLYPROPYLENE SUBSTRATE

2016 ◽  
Vol 78 (5-6) ◽  
Author(s):  
A. A. Azlan ◽  
M. T. Ali ◽  
M. F. Jamlos
Keyword(s):  
Dielectric Constant ◽  
Loss Tangent ◽  
Dual Band ◽  
Operating Frequency ◽  
Personal Communications ◽  
Band Frequency ◽  
Physical Size ◽  
Circular Patch ◽  
Indoor Wireless ◽  
Wireless Personal Communications

In this paper, sectorial and circular slot Pac-man antenna for dual band frequency, 1.7 GHz for indoor wireless personal communications and 2.45 GHz Industrial science and medical (ISM) was proposed by using polypropylene (PP) flat pressed temperature con-trolled method. The method and material was chosen to reduce the overall cost and proposed new substrate with density =0.9gcm-3, dielectric constant = 2.57 and loss tangent = 0.0352.The dual band operation was distributed by sectorial slot design with, small circular slot to control and tuning the operating frequency. The back to back comparison between normal circular patch with Pac-man antenna using proposed substrate are dis-cussed and overall result distributed that there is no significant changes for gain, directivity, efficiency, vswr and physical size even though the proposed Pac-man antenna perform for dual band operation hence it is al-so improve the bandwidth of 17% compared to normal circular patch. The final Pac-man design fabricated using proposed polypropylene substrate (PP100) was then analyzed by using OTA-500 ATENLAB anechoic chamber.

scholarly journals Miniaturization Design for 8 × 8 Butler Matrix Based on Back-to-Back Bilayer Microstrip

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yu Zhai ◽  
Xiaoxing Fang ◽  
Kejia Ding ◽  
Fei He
Keyword(s):  
Power Distribution ◽  
Phase Shifter ◽  
Low Cost ◽  
Phase Error ◽  
Butler Matrix ◽  
Relative Bandwidth ◽  
Indoor Wireless ◽  
The Matrix ◽  
Fixed Phase ◽  
Better Than

A low-cost, compact 8 × 8 Butler matrix based on a novel bilayer microstrip configuration is presented and implemented for 4.3 GHz telecommunication application. A back-to-back placed bilayer microstrip structure has been proposed to avoid using crossover. To expand operational bandwidth of the Butler matrix, a three-branch line directional coupler has been employed as 3 dB/90° bridge, and a kind of improved two-order Schiffman phase shifter has been adopted as fixed phase shifter. For application of indoor wireless communication, a compact broadband 8 × 8 Butler matrix has been designed and fabricated. The measured results show that the return loss of the matrix is lower than −10 dB, the isolation is better than 17 dB, the power distribution error is less than ±2.0 dB, the phase error is less than ±15°, and the relative bandwidth is more than 23%.

Design of a Kind of Combined Antenna with Wide Band for Passive Radar Application

2013 ◽  
Vol 325-326 ◽  
pp. 930-934
Author(s):  
Li Zhong Song ◽  
Xi Li ◽  
Bing Xia Cao
Keyword(s):  
Simple Structure ◽  
Low Cost ◽  
Characteristic Impedance ◽  
Wide Band ◽  
Operating Frequency ◽  
Passive Radar ◽  
Frequency Range ◽  
Archimedean Spiral ◽  
Operating Frequency Range ◽  
Polarization Characteristics

The wide band antenna is a key technique for the passive radar. This paper proposed a new kind of wide band antenna combined with the Archimedean spiral and hemispherical helix for passive radar application. For the new antenna, the planar Archimedean spiral is mounted on the top of the hemispherical helix, and it is fed at the center of the Archimedean spiral. An antenna with specific structure and parameters was designed and simulated to obtain its radiation performances over the operating frequency range from 2GHz to 10GHz. For entire operating frequency range, the simulated gain is greater than 5 dBi and the voltage standing wave ratio (VSWR) is less than 2 when the characteristic impedance of transmission line at the terminal is 240Ω. Wide beam and approximately circular polarization characteristics are also observed. The simulation results demonstrate that the new kind of antenna has wide band radiation performances, which can be used in passive radars. Furthermore, the proposed antenna has simple structure and low cost, so it is suitable for mass fabrication.

scholarly journals Dual-Band RF Wireless Power Transfer System with a Shared-Aperture Dual-Band Tx Array Antenna

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3803
Author(s):  
Chan-Mi Song ◽  
Hong-Jun Lim ◽  
Son Trinh-Van ◽  
Kang-Yoon Lee ◽  
Youngoo Yang ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Array Antenna ◽  
Dual Band ◽  
Single Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Beam Focusing ◽  
Received Power ◽  
Rf Wireless

In this paper, a dual-band RF wireless power transfer (WPT) system with a shared-aperture dual-band Tx array antenna for 2.4 and 5.8 GHz is proposed. The final configuration of the Tx array, which is made up of 2.4 GHz right-handed circular polarization (RHCP) patches and 5.8 GHz RHCP patches, is derived from the optimization of 2.4 and 5.8 GHz thinned arrays, ultimately to achieve high transmission efficiency for various WPT scenarios. The dual-band RF WPT Tx system including the Tx array antenna and a Tx module is implemented, and Rx antennas with a 2.4 GHz patch, a 5.8 GHz patch, and a dual-band (2.4 and 5.8 GHz) patch are developed. To validate the proposed dual-band RF WPT system, WPT experiments using a single band and dual bands were conducted. When transmitting RF wireless power on a single frequency (either 2.482 GHz or 5.73 GHz), the received power according to the distance between the Tx and Rx and the position of the Rx was measured. When the distance was varied from 1 m to 3.9 m and the transmitted power was 40 dBm, the received power value at 2.482 GHz and 5.73 GHz were measured and found to be 24.75–13.5 dBm (WPT efficiency = 2.985–0.224%) and 19.25–6.8 dBm (WPT efficiency = 0.841–0.050%), respectively. The measured results were in good agreement with the calculated results, and it is revealed that the transmission efficiency when wireless power is transmitted via beam-focusing increases more than that with conventional beam-forming. Furthermore, the dual-band WPT experiment proves that 2.482 GHz beam and 5.73 GHz beams can be formed individually and that their wireless power can be transmitted to a dual-band Rx or two different Rx.

scholarly journals Propagation Channel Measurements in the mm- and Sub-mm Wave Range for Different Indoor Communication Scenarios

2021 ◽  
Vol 42 (4) ◽  
pp. 357-370
Author(s):  
M. A. Salhi ◽  
T. Kleine-Ostmann ◽  
T. Schrader
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
Electromagnetic Spectrum ◽  
Channel Measurements ◽  
Frequency Range ◽  
Propagation Channel ◽  
Data Rates ◽  
Indoor Wireless ◽  
Wave Range

AbstractIncreasing data rates in wireless communications are accompanied with the need for new unoccupied and unregulated bandwidth in the electromagnetic spectrum. Higher carrier frequencies in the lower THz frequency range might offer the solution for future indoor wireless communication systems with data rates of 100 Gbit/s and beyond that cannot be located elsewhere. In this review, we discuss propagation channel measurements in an extremely broad frequency range from 50 to 325 GHz in selected indoor communication scenarios including kiosk downloading, office room communication, living rooms, and typical industrial environments.

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