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Your search keyword '"Qin, Pei"' showing total 32 results
Start Over Author "Qin, Pei" Journal ieee transactions on antennas and propagation
32 results on '"Qin, Pei"'

31. Circular-Polarized Substrate-Integrated-Waveguide Leaky-Wave Antenna With Wide-Angle and Consistent-Gain Continuous Beam Scanning

Author

Shu-Lin Chen, Zheng Li, Richard W. Ziolkowski, Y. Jay Guo, Pei-Yuan Qin, Debabrata K. Karmokar, Chen, Shu-Lin, Karmokar, Debabrata K, Li, Zheng, Qin, Pei-Yuan, Ziolkowski, Richard W, and Guo, Y Jay

Subjects
substrate-integrated waveguide (SIW), consistent gain, Waveguide (electromagnetism), Materials science, circularly polarized (CP), business.industry, Leaky wave antenna, 020206 networking & telecommunications, 02 engineering and technology, Substrate (electronics), Radiation, continuous beam scanning, Optics, Dispersion (optics), 0202 electrical engineering, electronic engineering, information engineering, Equivalent circuit, Wireless, Electrical and Electronic Engineering, business, leaky-wave antenna (LWA), Beam (structure)
Abstract

Circularly polarized (CP) antennas are in high demand for use in future wireless communications. To advance the development of CP substrate-integrated-waveguide (SIW) leaky-wave antennas (LWAs) with the intent to meet this demand,a novel benzene-ring-shaped slot-loaded LWA with partially reflecting wall (PRW) vias is investigated and verified to realize wide-angle continuous beam scanning with consistent gain. The dispersion features of slot-loaded SIW LWAs with PRW vias are theoretically explored using an equivalent circuit model. The CP radiation feature is investigated numerically utilizing the E- and H-field distributions of an initial design and its equivalent magnetic currents. The results of these studies are used to demonstrate that improved CP performance over a wide-angles can range can be attained with a change from a standard slot shape to a benzene-ring-shaped slot. The resulting benzene-ring shaped slot-loaded CP SIW LWA was optimized, fabricated, and measured. The measured results verify that a CP beam was continuously scanned through a wide angle from backward to forward directions with a consistent gain. The prototype exhibits a continuous 97.1° CP beam scan with a gain variation between8 and 11.3 dBic when the source frequency is swept from9.35 to 11.75 GHz. Refereed/Peer-reviewed

Published
2019

32. Substrate Integrated Waveguide-Based Periodic Backward-to-Forward Scanning Leaky-Wave Antenna With Low Cross-Polarization

Author

Shu-Lin Chen, Trevor S. Bird, Pei-Yuan Qin, Y. Jay Guo, Debabrata K. Karmokar, Karmokar, Debabrata K, Guo, Y Jay, Qin, Pei-Yuan, Chen, Shu-Lin, and Bird, Trevor S

Subjects
Waveguide (electromagnetism), Materials science, business.industry, Leaky wave antenna, 020208 electrical & electronic engineering, Engineering, Electrical & Electronic, 020206 networking & telecommunications, 02 engineering and technology, Stopband, Microstrip, Engineering, Optics, beam scanning, Telecommunications, 0202 electrical engineering, electronic engineering, information engineering, Harmonic, backward-to-forward scanning, Electrical and Electronic Engineering, Antenna (radio), broadside beam, business, Beam (structure), Broadside
Abstract

For many leaky-wave antennas (LWAs), it is challenging to realize beam scanning through broadside. A problem is the presence of an open stopband (OSB), which restricts radiation in the broadside direction. In this paper, a novel substrate integrated waveguide (SIW)-based LWA is described to overcome the OSB problem and provide beam scanning continuously from the backward to the forward direction from a conventional periodic LWA. It is demonstrated that the n = -1 spatial harmonic can be excited efficiently from an SIW LWA and enables broadside radiation. However, it was found in our initial design that when the beam scans through the broadside, the cross-polarization level increases significantly compared to the beam close to the backfire direction. A technique is developed to reduce the cross-polarization level. As a result, a new antenna configuration is created. The antenna design has been realized and measured to validate the concept. The measured beam scanning range of the prototype is from -74 degrees to +45 degrees (119 degrees of beam scanning) when the frequency sweeps from 7.625 to 11 GHz, and the measured cross-polarization level is 20.8 dB low at the main beam direction for the broadside beam. Refereed/Peer-reviewed

Published
2018

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