Radome being an RF window and support structure for an antenna system is a very critical element of terrestrial and airborne radar systems. This paper presents an efficient X-band frequency select surface (FSS)-antenna-radome system for airborne and ground applications. In the first step, an optimum wall configuration with lowest insertion loss is found out of A-sandwich, C-sandwich and multilayers wall configurations. In the second step, two 5×5 arrays (FSS screens) are designed that cover the whole antenna face in the broadside direction for a controlled and secure communication system. A slotted array on a dielectric substrate gives a bandpass feature with antenna for radome operation. A dipole array on a dielectric substrate gives a broader bandwidth with antenna somewhat different from antenna alone. It makes the antenna to stop radiating for a specific band. So, it gives bandstop feature. This proposed FSS-antenna-radome system is demonstrated with an X-band high directional horn antenna over the frequency range 9.4-16 GHz under a sandwich-wall dielectric radome. The bandpass and bandstop features make this proposed FSS-antennaradome a good candidate for ground and airborne applications for secure communications. In bandpass feature, antenna becomes inaccessible to other antennas/radars except a narrow band.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
A triple-band ± 45° dual-polarized dipole antenna is presented in this paper. The proposed antenna covers two n77 bands and one n79 band in 5G NR frequency spectrums with S11, S22 <− 15 dB return loss. The profile antenna exhibits the measured impedance bandwidths of 250 MHz, 150 MHz and 350 MHz from the operating bands 3.6-3.85 GHz, 4.05-4.2 GHz and 4.8-5.15 GHz respectively. Antenna is fabricated with four substrates; one radiator, one reflector and two feeding baluns. Antenna is designed and optimized with HFSS simulator and fabricated for experimental verification. Antenna gives a stable radiation pattern of 8.55 dBi high gain with 70° half power beam width (HPBW) that makes it a good candidate for wireless 5G sub-6 GHz and multiband base station applications. Finally, antenna is tested in a realistic application environment to show the utility of the proposed antenna for wireless sub-6 GHz IoT applications.
Millimeter-wave (mm-Wave) technology has opened a new era of wireless communication systems in various fields like automotive, mobile devices, Internet of Things (IoT), military, medical, and others. The benefit of adopting the unconventional frequency spectrum of large bandwidth under an mm-Wave spectrum is the availability of large bandwidth and lesser chances of interferences from various technologies. In the recent 5G communication systems either cellular or other wireless applications, many researchers have focused on mm-Wave antennas and arrays. In this paper, a dual-array antenna system is designed for various 5G mm-Wave wireless applications. It has two arrays on the same substrate edges with a series feed line compact technique. The profile antenna system has two 1×16 arrays on the same substrate edges. Each array gives 17.3 dB and 16.4 dB simulated and measured gains and impedance bandwidth 31.30 GHz to 39 GHz at 38 GHz center frequency. The feature to use both arrays at the same time for two different applications within the operational band for same or different center frequencies makes this proposed dual-array antenna system a good candidate for 5G mm-Wave wireless IoT and broadcast applications.
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