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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.

This paper presents the performance of an Adaptive Transmit Beamspace Beamformer (ATBBF) in a dynamic channel for Multiple Input Single Output (MISO) per user wireless system. An ATBBF consists of several transmit beamformers on the Transmit Antenna Array (TAA). The antenna weights of each Transmit Beamformer (TB) are held constant while its input is weighted by an adaptive beamspace weight. A Beamspace Gradient Sign Feedback (BGSF) algorithm updates these beamspace weights. The performance metric of an ATBBF is derived and analyzed in a dynamic channel undergoing Rayleigh fading independently at the antennas. A performance comparison between an ATBBF and a TB having adaptive antenna weights is made in terms of convergence and tracking of various slow and fast fading channels by simulations. Both Full Dimension (FD) and Reduced Dimension (RD) ATBBFs are considered. Comparisons show that the FD ATBBF gives a performance equivalent to that of a TB and outperforms the RD ATBBF. Thus the FD ATBBF can provide beamforming gain and fading diversity similar to that of a TB. Furthermore, the performance of the FD ATBBF improves on increasing the number of antenna elements of the TAA.

A triple-band ±45° dual-polarized dipole antenna is presented in this paper. The proposed antenna covers two bands from n77 and one from n79 5G NR frequency spectrums. The profile antenna exhibits the measured impedance bandwidths 3.6-3.85 GHz, 4.05-4.2 GHz and 4.8- 5.15 GHz with S11, S22 < - 15dB return loss. 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 with 8.55dBi high gain and 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.

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