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Yu Y.,Quanzhou Normal University | Yu Y.,Key Laboratory of Information Functional Materials for Fujian Higher Education | Wu L.,Quanzhou Normal University | Wu L.,Key Laboratory of Information Functional Materials for Fujian Higher Education | And 4 more authors.
APCAP 2016 - 2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation, Conference Proceedings | Year: 2016

In the present paper, three type Bessel resonators at mm-and submm-wavelengths, which are a stable Bessel-Gauss resonator, an unstable Bessel-Gauss resonator, and a Bessel resonator, respectively, are constructed by the quasi-optical theory and techniques. To analyze the designed resonators precisely, the algorithm named as iterative dyadic Green's functions (IDGF) is adopted, which can output the three-dimension (3-D) resonating modes in the cavity. The comparison results are given in this paper. The Bessel-type beams would found their promising applications in the MM-and/or quasi-optical imaging and measurement systems. © 2016 IEEE.


Yu Y.,Quanzhou Normal University | Yu Y.,Key Laboratory of Information Functional Materials for Fujian Higher Education | Gao J.,Quanzhou Normal University | Gao J.,Key Laboratory of Information Functional Materials for Fujian Higher Education | And 2 more authors.
APCAP 2016 - 2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation, Conference Proceedings | Year: 2016

We present a method to produce multiple optical needles with variable lengths. The created needles are high purely longitudinal polarization and consistent beam size of ∼0.36λ over two peak densities. This is achieved by inversing the electromagnetic field eradiated from a sectional-uniform line source antenna, for which the electric current is constant along each section, situated at the focus of the 4Pi focusing system. The required illumination distribution at the pupil plane to generate multiple optical needles can be obtained easily by solving the inverse problem. Numerical results indicate that the length of each needle is determined by the length of each sectional-uniform line source. These novel focusing patterns might found potential applications in particle acceleration, microscopy, and optical trapping. © 2016 IEEE.


Yu Y.,Quanzhou Normal University | Yu Y.,Key Laboratory of Information Functional Materials for Fujian Higher Education | Ni J.,Quanzhou Normal University | Ni J.,Key Laboratory of Information Functional Materials for Fujian Higher Education | And 2 more authors.
Advanced Electromagnetics | Year: 2015

In this paper, a dual-band dipole antenna for passive radio frequency identification (RFID) tag application at 2.45 GHz and 5.8 GHz is designed and optimized using HFSS 13. The proposed antenna is composed of a bent microstrip patch and a coupled rectangular microstrip patch. The optimal results of this antenna are obtained by sweeping antenna parameters. Its return losses reach to −18.7732 dB and −18.2514 dB at 2.45 GHz and 5.8 GHz, respectively. The bandwidths (Return loss <=−10 dB) are 2.42~2.50 GHz and 5.77~5.82 GHz. And the relative bandwidths are 3.3% and 0.9%. It shows good impedance, gain, and radiation characteristics for both bands of interest. Besides, the input impedance of the proposed antenna may be tuned flexibly to conjugate-match to that of the IC chip. © 2015 by Advanced Electromagnetics. All rights reserved.

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