Abstract
In this paper, a millimeter-wave printed quadrupole antenna is proposed. It consists of two symmetric printed dipoles that make the quadrupole radiating power omnidirectionally. Such an arrangement eliminates the influence of the ground as reflector. Simulation results show that the quadrupole antenna exhibits a broad impedance bandwidth and an enhanced gain compared to conventional dipoles. More interestingly, the configuration of the quadrupole includes an integrated feed network, making the design compact. Next, a novel omnidirectional array was designed, simulated, fabricated, and measured, exhibiting enhanced features like compactness, broad bandwidth, high gain, high efficiency, low cross-polarization, low cross-polarization level, low cost, and low profile.
Highlights
The millimeter-wave communication technique, which can use enormous underutilized bands beyond the traditional licensed bands to overcome the challenge of global bandwidth shortage, has been recognized as a key technology for the future communication systems [1], [2]
Omnidirectional arrays are even more difficult to design because the extra feed networks contain grounds
Simulated results demonstrated its good performance in terms of gain, bandwidth, efficiency, and cross-polarization levels
Summary
The millimeter-wave (mm-wave) communication technique, which can use enormous underutilized bands beyond the traditional licensed bands to overcome the challenge of global bandwidth shortage, has been recognized as a key technology for the future communication systems [1], [2]. A typical example is printed dipoles, in which the existence of a ground plane makes the dipoles inherently provide directional or quasi-omnidirectional power radiation [7] As a result, this type of antenna is usually used as driven element to design Yagi-Uda antennas and arrays that can provide more focused beams [8]-[10]. The planar antenna presented in [15] achieved a better performance of bandwidth (57 - 64 GHz, 11.6%), but its average gain is only 1.4 dBi. In this paper, a novel printed quadrupole antenna configuration is proposed. The quadrupole exhibits a good impedance bandwidth of 2.7 GHz and an enhanced gain of 5.6 dBi. a 1 × 6 array fed by a microstrip line feed network was designed. They feature low profile, low cost, simple planar structure, and simple fabrication process
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