This paper proposes a conformal multiple band four port MIMO antenna for next generation vehicular communications in the extended UWB. The single element consists of a monopole antenna resembling a U-shaped structure with two branches folded and complimentary to each other. It uses coplanar waveguide feeding with a defected ground structure. The antenna is printed on a Kapton Polyamide flexible substrate having a thickness of 0.25 mm. The antenna has dimensions of 0.8λ × 0.8λ × 0.001λ. It resonates at 2.6 GHz, 3.9 GHz, and 5.6 GHz which are used in vehicular communications, and can be used in sub-6 GHz 5G applications. It also provides band notches at 2.1 GHz, 3.5 GHz, and 4.5 GHz which enables it to mitigate the interferences from any narrow band devices operating in that range. All MIMO parameters are simulated and compared with the measured results, and are found to be in good agreement. The designed antenna can be mounted at any position of the vehicle as it has a conformal structure.
A compact wideband operating from 3 to 20 GHz MIMO antenna with quadruple notches is presented in this paper. The elements in MIMO configuration are arranged in orthogonal fashion with each other to minimize the coupling effects. The antenna consists of circular rings and a modified microstrip feed. By engraving a crescent shaped slot, split ring-shaped slot, circle shaped slot in the circular monopole, rectangular spiral shaped slot engraved along the feed line, quadruple notches are attained. The antenna operates from 3 GHz to 18 GHz with notches in the range of 3.3 GHz-4.2 GHz centered at 3.5 GHz, 4.5 GHz-5.5 GHz centered at 4.9 GHz, 6.2 GHz-7.3 GHz centered at 6.6 GHz, and 8.1 GHz-8.8 GHz centered at 8.5 GHz. The element has a very compact size of 0.28λ × 0.22λ × 0.016λ at 3 GHz and is hence suitable for portable devices.
This paper presents a triple-band planar antenna with diverse radiation patterns. The proposed planar antenna is a modified swastika shape with three fingers and the ground plane is a circle with rectangular slots etched on four sides radially. The slotted ground plane is loaded with Four PIN diodes to realign the surface current. Pattern reconfigurability is achieved at the triple bands by changing the states of the diode. The antenna operates in triple bands centered at 2.2, 2.9 and 3.5 GHz. The antenna is printed on FR4 Epoxy substrate. The simulated reflection coefficient is well below −10dB at resonant frequencies. The measured patterns and return loss are in very close agreement with the simulated results. This antenna can find potential applications in 5G systems.
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