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In this study, a novel substrate integrated low‐profile magneto‐electric dipole antenna is proposed and investigated. The proposed antenna is composed of semi‐circular patches as an electric dipole, vertical plated through holes which are shorted to the ground as a magnetic dipole, a modified ground, and a rectangular reflector for enhancing the gain. The antenna is fed via a Γ‐shaped probe. The entire structure is achieved by the multilayer printed circuit board technology, and it is suitable for mass production and low cost. By introducing the defected ground structure, the total thickness of the proposed antenna is decreased to 0.082λ0 (where λ0 is the free‐space wavelength at 5.5 GHz). To improve the impedance matching, two open slots are etched on the semi‐circular patches. An antenna prototype was fabricated and measured. The results illustrate that the antenna obtains a broad bandwidth of 14.7% from 5.10 to 5.91 GHz (voltage standing wave ratio (VSWR) ≤ 2). Moreover, the stable gain and unidirectional radiation patterns with low back lobe and low cross polarisation in the E‐ and H‐plane are obtained over the operating frequency band. It is demonstrated that the antenna satisfies the requirements of 5G wireless local area network, worldwide interoperability for microwave access (WiMAX), and WiFi.

In this paper, a novel triple-band dipole antenna is presented. The proposed antenna has a very simple structure and is easily designed. The idea of the antenna is based on the traditional wideband bow-tie dipole antenna. Via etching slots on the bow-tie patch, three bent dipoles with different lengths which correspond to different operating frequencies are formed. Hence, the triple-band antenna is generated. Each operating frequency band realizes wideband and can be adjusted almost independently. And the antenna is fed by a 50 Ω microstrip line and a wideband microtrip-to-coplanar-stripline (CPS) transition as a balun. The good performances of the proposed antenna are achieved by a mass of simulations and measurements. The measured results have a good agreement with the simulated ones. The results show that the proposed antenna obtains three bandwidths at 2.38~2.65 GHz (10.7 %), 3.17~4.08 GHz (25.1 %), and 4.75~6.00 GHz (23.2 %) with the reflection coefficient less than −10 dB. In addition, the stable gain and quasi-omnidirectional radiation patterns are obtained in the operating frequency bands. Therefore, the proposed antenna is suitable for WLAN/WiMAX/LTE applications.

In this article, a novel substrate integrated low‐profile dual‐band magneto‐electric (ME) dipole antenna is proposed. The entire antenna is constructed by four‐layer printed circuit boards (PCBs). Consequently, the height of the proposed antenna is decreased from 0.25λ0 to 0.11λ0 (λ0 is the free‐space wavelength at 5.5 GHz). By introducing rectangular patches with different sizes as electric dipoles, dual operating bands are achieved. Meanwhile, for the purpose of improving the impedance matching at the lower frequency band, a pair of complementary split‐ring resonators (CSRRs) is etched on the larger rectangular patches. Moreover, the short walls composed of plated through holes operate as a magnetic dipole. The antenna is fed by an equivalent wideband microstrip‐to‐parallel stripline balun. The results show that the antenna obtains dual bandwidths of 4.31‐4.71 GHz (8.8%) and 5.07‐5.89 GHz (14.9%) with VSWR <2, which can be applied for C‐band and 5G WiFi. Over the dual operating bands, stable gain and unidirectional radiation patterns with low polarization and low back lobe are also obtained.

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