7 results on '"WEI GAO"'
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2. Polarization-Reconfigurable Circularly Polarized Planar Antenna Using Switchable Polarizer.
- Author
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Li, Wenting, Gao, Steven, Cai, Yuanming, Luo, Qi, Sobhy, Mohammed, Wei, Gao, Xu, Jiadong, Li, Jianzhou, Wu, Changying, and Cheng, Zhiqun
- Subjects
PLANAR antennas ,CIRCULAR polarization ,ANTENNA radiation patterns ,ANTENNA feeds ,PIN diodes - Abstract
A novel polarization-reconfigurable planar antenna is presented. The antenna consists of an electronically reconfigurable polarizer integrated with a printed slot. By changing the states of the p-i-n diodes on the polarizer, the linearly polarized (LP) waves radiated by the slot can be converted into either right-hand circularly polarized (RHCP) or left-hand CP (LHCP) waves. The polarizer contains 16 unit cells arranged as a $4\times 4$ array. The antenna radiates RHCP waves if the p-i-n diodes on the top side of the polarizer are switched ON, while LHCP waves are radiated if the p-i-n diodes of the bottom side of the polarizer are switched ON instead. The physical mechanisms of the antenna are discussed and the parametric study is carried out by full-wave simulations. To verify the concept, one prototype at 2.5 GHz is designed, fabricated, and measured. Good agreement between the measured and simulated results is obtained. The antenna achieves a gain ≥8.5 dBic in both RHCP and LHCP with an aperture efficiency of 70%. Advantages of the proposed design include electronically reconfigurable polarizations for RHCP or LHCP, low profile, low cost, high isolation between the dc bias circuit and RF signals, high power handling capability, and easy extension to large-scale arrays without increasing the complexity of the dc bias circuit. To the best of our knowledge, this is the first report of an electronically polarization-reconfigurable CP antenna with a single-substrate polarizer. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
3. A Planar Integrated Folded Reflectarray Antenna With Circular Polarization.
- Author
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Zhang, Chong, Wang, Yongfeng, Zhu, Fuguo, Wei, Gao, Li, Jianzhou, Wu, Changying, Gao, Steven, and Liu, Haitao
- Subjects
REFLECTARRAY antennas ,CIRCULAR polarization ,TELECOMMUNICATION satellites ,INTEGRATED circuits ,PLANAR antennas - Abstract
This communication presents the complete design of a circularly polarized (CP) folded reflectarray (FRA) antenna with an integrated planar structure for the first time in the open literature. To achieve circularly polarized, a printed meander-line polarizer is designed and integrated with the linearly polarized (LP) FRA. To achieve a low-profile planar structure, an integrated $2 \times 2$ planar array is designed as the feed source instead of a horn. Thus, the whole antenna, including the feed source, LPFRA, and meander-line polarizer, can be fully integrated and fabricated using low-cost printed circuit board technology. To validate the concept, a right-handed CPFRA operating in C-band is designed, fabricated, and measured. The broadside axial ratio (AR) of the proposed CPFRA is lower than 1 dB over a bandwidth from 5.22 to 5.46 GHz. In addition, the maximum gain of 22.8 dBic is obtained at 5.38 GHz with the antenna efficiency of 27%. The antenna is promising for applications in satellite communication due to advantages of low profile, easy fabrication, low cost, and high gain. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
4. A Simple Low-Cost Shared-Aperture Dual-Band Dual-Polarized High-Gain Antenna for Synthetic Aperture Radars.
- Author
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Qin, Fan, Gao, Steven Shichang, Luo, Qi, Mao, Chun-Xu, Gu, Chao, Wei, Gao, Xu, Jiadong, Li, Janzhou, Wu, Changying, Zheng, Kuisong, and Zheng, Shufeng
- Subjects
SYNTHETIC aperture radar ,ANTENNAS (Electronics) ,COST effectiveness ,POLARIZATION (Electricity) ,MICROFABRICATION - Abstract
This paper presents a novel shared-aperture dual-band dual-polarized (DBDP) high-gain antenna for potential applications in synthetic aperture radars (SARs). To reduce the complexity of SAR antennae, a DBDP high-gain antenna based on the concept of Fabry–Perot resonant cavity is designed. This antenna operates in both $C$ - and $X$ -bands with a frequency ratio of 1:1.8. To form two separate resonant cavities, two frequency selective surface layers are employed, leading to high flexibility in choosing desired frequencies for each band. The beam-scanning capability of this proposed antenna is also investigated, where a beam-scanning angle range of ±15° is achieved in two orthogonal polarizations. To verify this design concept, three passive antenna prototypes were designed, fabricated, and measured. One prototype has broadside radiation patterns, while the other two prototypes have frozen beam scanned to +15°. The measured results agree well with the simulated ones, showing that the high gain, high port isolation, and low cross-polarization levels are obtained in both the bands. Compared with the conventional high-gain DBDP SAR antennae, the proposed antenna has achieved a significant reduction in the complexity, mass, size, loss, and cost of the feed network. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
5. Dual Circularly Polarized Equilateral Triangular Patch Array.
- Author
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Luo, Qi, Gao, Steven, Sobhy, Mohammed, Sri Sumantyo, Josaphat Tetuko, Li, Jianzhou, Wei, Gao, Xu, Jiadong, and Wu, Changying
- Subjects
CIRCULAR polarization ,MICROSTRIP antennas ,ANTENNA arrays ,MIMO systems ,SIMULATION methods & models - Abstract
This paper presents a novel sequentially rotated patch array antenna with dual circular polarizations (CP). The present design has the advantages of compact size, simple feed networks, low cross polarization, and high isolation. The radiating elements are dual linearly polarized (LP) equilateral triangular patches with hybrid feeds. The vertical polarization (VP) of the patch antenna is obtained by using an aperture-coupled feed and the horizontal polarization (HP) is obtained by using a proximity feed. These two feeds are orthogonally positioned and are printed on different PCB layers, which leads to the high isolation between these two ports and facilitates the design of the feed networks. The array antenna consists of six such dual-LP triangular patches sequentially rotated by 60 ^\circ and fed by separated feed networks. Since LP antenna elements are used, the design of the feed network is much simplified. Through sequentially varying the feeding phase by \pm 60^\circ, dual circular polarizations are obtained. The operation principle of the array antenna is also analytically explained in this paper. To verify the design concept, one dual LP equilateral triangular patch and one dual CP equilateral triangular patch array resonating at 10.5 GHz are designed, fabricated, and tested. There is a good agreement between the simulation and measurement results, both of which show that the array antenna exhibits high port isolation and good circular polarizations with low cross polarization at different planes. The proposed design technique can be applied to the design of dual CP array antennas operating at other frequency bands. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
- Full Text
- View/download PDF
6. Compact Smart Antenna With Electronic Beam-Switching and Reconfigurable Polarizations.
- Author
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Gu, Chao, Gao, Steven, Liu, Haitao, Luo, Qi, Loh, Tian-Hong, Sobhy, Mohammed, Li, Jianzhou, Wei, Gao, Xu, Jiadong, Qin, Fan, Sanz-Izquierdo, B., and Abd-Alhameed, Raed A.
- Subjects
ANTENNAS (Electronics) ,DIODES ,POLARIZATION (Electricity) ,LASER beam polarization ,POWER electronics - Abstract
This paper presents a compact-size, low-cost smart antenna with electronically switchable radiation patterns, and reconfigurable polarizations. This antenna can be dynamically switched to realize three different polarizations including two orthogonal linear polarizations and one diagonally linear polarization. By closely placing several electronically reconfigurable parasitic elements around the driven antenna, the beam switching can be achieved in any of the three polarization states. In this design, a polarization reconfigurable square patch antenna with a simple feeding network is used as the driven element. The parasitic element is composed of a printed dipole with a PIN diode. Using different combinations of PIN diode
on/off states, the radiation pattern can be switched toward different directions to cover an angle range of 0° to 360° in the azimuth plane. The concept is confirmed by a series of measurements. This smart antenna has the advantages of compact size, low cost, low power consumption, reconfigurable polarizations, and beams. [ABSTRACT FROM PUBLISHER]- Published
- 2015
- Full Text
- View/download PDF
7. Design of a Wideband Dual-Polarization Full-Corporate Waveguide Feed Antenna Array.
- Author
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Zhou, Shi-Gang, Huang, Guan-Long, Chio, Tan-Huat, Yang, Jiang-Jun, and Wei, Gao
- Subjects
BROADBAND communication systems ,POLARIZATION (Electricity) ,WAVEGUIDE antennas ,ANTENNA arrays ,MACHINING - Abstract
A wideband and dual-polarization antenna array with high efficiency and high isolation is proposed. In order to achieve the desired performance, a wideband radiating element and a full-corporate waveguide feed network are employed in the design. In particular, ${{E}}-plane waveguides are utilized for the feed-network configuration so as to suppress wave leakage between adjacent layers when the antenna is fabricated via conventional machining techniques. The operational mechanism is presented and a \text16 \times \text16 antenna array is tested for verification. Experimental results show that the bandwidths of VSWR < \text2.0 for both of the polarizations are about 17.1% (12.45–14.78 GHz) and the isolation between the two polarization ports is better than 39.5 dB. In addition, more than 70% antenna efficiency with higher than 29.4 dBi gain is achieved over the operational bandwidth. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
- Full Text
- View/download PDF
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