• Energy Research

This paper presents a novel MIMO antenna array configuration that incorporates metamaterial isolation surfaces to enhance overall performance. It was demonstrated that the directivity of this antenna array can be precisely electronically reconfigured using PIN diode switches. Additionally, the feasibility of integrating solar panels with the proposed MIMO antenna array is shown. Adopting solar panels in 5G base stations is expected to reduce dependency on traditional grid power sources, thereby decreasing energy usage and operational expenses, and supporting the goal of achieving netzero emissions in communication systems. Furthermore, the effectiveness of an artificial intelligence (AI)-enabled equalizer in mitigating degradation in channel capacity caused by signal power fluctuations was demonstrated, thereby enhancing the reliability and efficiency of wireless communication systems. The multifaceted benefits of combining these technologies were demonstrated.

An Ultra-wideband antenna for 5G V-band applications was proposed in this work. A conventional circular patch antenna was modified by using two set of fractal patches to increase the operational bandwidth of the antenna. While a circular slot was utilized to adjust the radiation pattern of the proposed work. The antenna offers an ultrawideband of < 30% with reference to the central frequency of 65 GHz. Moreover, the broadside radiation pattern, high gain and efficiency will make the proposed work a strong candidate for wideband applications using V-band spectrum.

This paper is focused on the extraction of the noise parameters of a linear active device by exploiting both forward and reverse noise power measurements associated with different terminations. In order for load-pull measurements to yield a significant marginal improvement (as compared to forward measurements only) it is expected that the device under test should appreciably deviate from unidirectionality. For this reason, the source/load-pull technique is applied to frequencies at which the considered devices are still usable but their reverse noise factor exhibits a measurable dependence on the output terminations. Details on the test bench set up to the purpose, covering the 20–40 GHz frequency range, are provided. A characterization campaign on a 60 nm gate length, 4×35 µm GaN-on-Si HEMT fabricated by OMMIC is illustrated.

This paper shows that by employing a combination of metamaterial (MTM) and substrate integrated waveguide (SIW) technologies, the drawbacks of narrow-bandwidth and low radiation properties encountered in terahertz on-chip antennas can be overcome. In addition, an effective feeding mechanism is introduced to excite the on-chip antenna. The proposed antenna is constructed on the three stacked layers comprising Silicon-metal-Silicon substrates. Dimensions of on-chip antenna are 1×1×0.265 mm3. The on-chip antenna is shown to have an average impedance match, gain, and efficiency parameters of -35dB, 8.5dBi, and 67.5%, respectively, over a wide frequency range of 0.20-0.22 THz.