Kwai-Man Luk

A Magnetoelectric Dipole Leaky-Wave Antenna for Millimeter-Wave Application

This paper presents a novel frequency beam scanning slotted leaky-wave magnetoelectric (ME) dipole antenna array for the fifth generation (5G) application. The proposed antenna, which has eighteen elements of slots and electric dipoles, is built on a two-layer printed circuit board. In the lower layer, it is a conventional slotted substrate integrated waveguide (SIW) leaky-wave antenna (LWA). In the upper layer, electric dipoles are attached to the design. As for each element unit, the magnetic dipole is realized by each lower-layer aperture, while the electric dipole is realized by each pair of patches in the upper layer. The design concept is that two modes are excited together in orthogonal directions to realize the ME dipole. By introducing electric dipoles to the conventional slotted LWA, the antenna exhibits less gain variation over a wide bandwidth. The SIW leaky-wave ME dipole antenna array is designed and fabricated to operate at the 28-GHz band. It operates with wide impedance bandwidth and a peak gain of 16.55 dBi with less than 3-dB gain variation throughout the frequency range from 27 to 32 GHz.

A Wideband Low Cost and Optically Transparent Water Patch Antenna With Omnidirectional Conical Beam Radiation Patterns

A novel kind of optically transparent, low cost and wideband water patch antenna is demonstrated and analyzed. A significant feature of the proposed linearly polarized antenna is that both the patch and the ground plane are made of water. Thus, the whole structure becomes optically transparent except the small central feeding probe. The main radiators are made of water, which is available everywhere, low in cost and easy to be fabricated compared with other transparent materials. Results show that a wide impedance bandwidth of 35% for

Millimeter-Wave MultiBeam Aperture-Coupled Magnetoelectric Dipole Array With Planar Substrate Integrated Beamforming Network for 5G Applications

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Dual Circular-Polarized SIW-Fed High-Gain Scalable Antenna Array for 60 GHz Applications

dB, a gain up to 4 dBi and symmetric omnidirectional conical beam radiation patterns with small cross-polarizations can be obtained. Due to the low cost and remarkable radiation performances, this novel transparent patch antenna is believed to have many promising applications in the future transparent electronics designs and flexible electronics.

A wideband high-efficiency polarization reconfigurable antenna for wireless communication

A modified topology of the 2-D multibeam antenna array fed by a passive beamforming network (BFN) is proposed by introducing two sets of vertical interconnections into the conventional array configuration. Different from the traditional design, the new array structure can be integrated into multilayered planar substrates conveniently, which has advantages of low loss characteristics, ease of realization, and low fabrication cost for millimeter-wave (mmWave) applications. A

APERTURE-COUPLED MICROSTRIP-LINE FEED FOR CIRCULARLY POLARIZED PATCH ANTENNA

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A Reconfigurable Magneto-Electric Dipole Antenna Using Bent Cross-Dipole Feed for Polarization Diversity

multibeam antenna array that can generate 16 beams is then designed, fabricated, and measured in order to demonstrate the correctness of the proposed topology. As the crucial components of the design, two kinds of aperture-coupled magnetoelectric dipole antenna elements with multilayered feed structures and three types of vertical interconnections consisting of the vertical substrate integrated waveguides are investigated, respectively. Wide bandwidth of 16.4%, stable radiation beams, and gain up to 14.7 dBi are achieved by the fabricated prototype. The proposed array configuration provides a new mean to implement the relatively large size 2-D multibeam antenna arrays with planar passive BFNs, which would be attractive for future mmWave wireless systems used for 5G communications and other applications.

High Gain And Wideband Complementary Antenna

In this paper, a dual circularly polarized high-gain scalable antenna array is proposed for the 60 GHz applications. The array consists of cross-slot-coupled cavity-backed square patch antenna elements fed by a novel substrate-integrated waveguide network. In our design, the two polarizations share the common radiating element and feed network so that they exhibit similar performance in terms of bandwidth, gain, and radiation patterns for both polarizations. An

DUAL POLARIZED HIGH GAIN AND WIDEBAND COMPLEMENTARY ANTENNA

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WAVEGUIDE FED AND WIDEBAND COMPLEMENTARY ANTENNA

element array is designed to demonstrate its function, and the simulated data exhibit an overlapped bandwidth (SWR < 2, 3 dB down gain bandwidth and AR < 3 dB) of approximately 23%, a gain up to 25.8 dBic for both ports, and a port-to-Port isolation larger than 14 dB. Good unidirectional and symmetrical radiation patterns are observed. A prototype is fabricated, and the measured results agree with the simulated ones with acceptable disparities. The reported structure is built by the conventional printed circuit board technology which is cost effective. With these advantages, the proposed scalable antenna design is a good candidate for millimeter-wave wireless communications.