Integrated Microwave Packaging Antennas and Circuits Technology (IMPACT) Lab

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Now showing 1 - 5 of 190
  • Article

    A Wideband Transition Design Technique from RWG to SIW Technologies

    (Institute of Electrical and Electronics Engineers (IEEE), 2023-10-02) Alam, Asif; Alam, Muhmmad Shah; AlMuhanna, Khalid; Zhang, Haoran; Shamim, Atif; Shamsan, Zaid Ahmed; Department of Electrical and Computer Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division; Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA; Department of Electrical Engineering, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia

    Efficient wide-band transitions play a critical role in integrating substrate-integrated waveguide (SIW) and air-filled substrate-integrated waveguide (AFSIW) systems with conventional rectangular waveguide (RWG) systems in millimeter wave communication. However, existing techniques lack a systematic design approach, overlook mode purity, encounter performance issues, involve tedious optimizations, and feature complex structures. This paper presents a first-of-its-kind design technique that addresses these limitations, enabling seamless transitions from RWG to both SIW and AFSIW. For the first time, a clear and systematic design flow is introduced, covering both transition scenarios. The proposed technique eliminates the need for separate design procedures, simplifying the process, reducing complexity, and offering a cost-effective solution with state-of-the-art performance. The key innovation lies in the analytical expression for the shortest transition length, derived for both SIW and AFSIW cases, facilitating the design process and optimizing transition performance. The effectiveness of the design flow is extensively validated through four design examples, evaluating mode purity, reflection coefficient, and insertion loss. The results demonstrate excellent performances, confirming the accuracy of the approach. Furthermore, a fabricated prototype achieves remarkable results with an insertion loss of 0.35 dB and a relative bandwidth of 40%, exhibiting state-of-the-art performances when compared to reported works in the literature. In summary, the novel design technique enables seamless wide-band transitions from RWG to both SIW and AFSIW, offering a unified approach with state-of-the-art performance.

  • Conference Paper

    A Via-Less Fully Screen-Printed Reconfigurable Intelligent Surface for 5G Millimeter Wave Communication

    (IEEE, 2023-07-23) Yang, Yiming; Wang, Ruiqi; Vaseem, Mohammad; Makki, Behrooz; Shamim, Atif; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division; Ericsson Research, Gothenburg, Sweden, 417 56

    In this paper, we propose a via-less fully screen-printed reconfigurable intelligent surface which can establish a second line-of-sight communication from 23.5GHz to 29.5GHz. By serially connecting the H shaped resonator along the H field of the incident wave, we minimize the effect of the biasing lines and make a via-less design, which reduces the fabrication difficulty and cost. The unit-cell simulation of the array with screen-printed VO2 switches shows a 215° to 160° phase shift difference between the ON and OFF states within bandwidth. During the field testing of the ideal arrays, we verify that the array can redirect the 45° incident wave to 0° reflection with a signal enhancement of at least 10 dB as compared to the array which has all unit cells in the OFF condition.

  • Article

    Printed Electrodes Based on Vanadium Dioxide and Gold Nanoparticles for Asymmetric Supercapacitors

    (MDPI AG, 2023-09-16) Minyawi, Bashaer A.; Vaseem, Mohammad; Alhebshi, Nuha; AlAmri, Amal; Shamim, Atif; Integrated Microwave Packaging Antennas and Circuit Technology (IMPACT) Lab, Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division; Electrical and Computer Engineering Program; Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Department of Physics, College of Science and Arts, King Abdulaziz University, Rabigh 21911, Saudi Arabia

    Printed energy storage components attracted attention for being incorporated into bendable electronics. In this research, a homogeneous and stable ink based on vanadium dioxide (VO2) is hydrothermally synthesized with a non-toxic solvent. The structural and morphological properties of the synthesized material are determined to be well-crystalline monoclinic-phase nanoparticles. The charge storage mechanisms and evaluations are specified for VO2 electrodes, gold (Au) electrodes, and VO2/Au electrodes using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The VO2 electrode shows an electrical double layer and a redox reaction in the positive and negative voltage ranges with a slightly higher areal capacitance of 9 mF/cm2. The VO2/Au electrode exhibits an areal capacitance of 16 mF cm−2, which is double that of the VO2 electrode. Due to the excellent electrical conductivity of gold, the areal capacitance 18 mF cm−2 of the Au electrode is the highest among them. Based on that, Au positive electrodes and VO2 negative electrodes are used to build an asymmetric supercapacitor. The device delivers an areal energy density of 0.45 μWh cm−2 at an areal power density of 70 μW cm−2 at 1.4 V in the aqueous electrolyte of potassium hydroxide. We provide a promising electrode candidate for cost-effective, lightweight, environmentally friendly printed supercapacitors.

  • Conference Paper

    An Antenna with Quasi-Isotropic Radiation Pattern Designed with Bent Dipoles

    (IEEE, 2023-07-23) Wang, Ruiqi; Klionovski, Kirill; Shamim, Atif; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division; Electrical and Computer Engineering Program

    Internet of Things (IoT) devices, typically, need electrically small antennas that can maintain orientation insensitive communication. This is feasible with quasi-isotropic radiation patterns. This paper presents a theoretical model, based on annular currents, for the design of antennas with quasi isotropic radiation patterns. The theoretical model is then used to design an antenna that comprises two orthogonal bent dipoles. The effect of the bending radius on the radiation isotropy performance has been studied. The theoretical results obtained using the annular current model have been verified by simulations and a fabricated antenna prototype. Measured results are in decent agreement with the simulated results and a quasi-isotropic radiation pattern of the antenna with a gain variation of 5.7 dB has been achieved.

  • Conference Paper

    Phased Array Antenna-in-Package Design for True-Wideband mmWave 5G Communication

    (IEEE, 2023-07-23) Zhang, Haoran; Shamim, Atif; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

    The phased array design for millimeter (mmwave) 5G communication need numerous concurrent features, such as wide bandwidth, high gain, dual-polarization, and wide beam scanning capability. However, due to mutual coupling and grating lobe issues, it is difficult to simultaneously attain a real wideband operation for all of the aforementioned parameters. Most published papers have only demonstrated wideband operation for one or two parameters. To achieve a true wideband performance, this work used a variety of design techniques, including stacked patch architecture, electromagnetic band gap (EBG) structures, and the rotation of components. In this paper, a 5 by 5 phased array is realized in a multilayered low-temperature co-firing ceramic (LTCC) substrate, along with its feeding network. The phased array's element is designed to be a dual linear polarized stacking patch antenna with notched corners to ensure the antenna's wide bandwidth. The orientation of the array element is adjusted 45 degrees for mutual coupling reduction. The proposed phased array achieved a bandwidth of 6 GHz (24 to 30 GHz). It also achieves a maximum gain of 17.5 dB and a beam steering capability from -50 to +50 degrees. The features of multilayered implementation, low dielectric loss, and excellent packaging properties ensure a compact and high-efficiency phased array design and qualify this design as an antenna-in-packaging (AiP) design.