Browsing by Author "Altaf, Ahsan"
Now showing items 1-19 of 19
-
A compact hairpin filter with stepped hairpin defected ground structure
Sajjad, Hassan; Altaf, Ahsan; Khan, Sana; Jan, Latif (Institute of Electrical and Electronics Engineers Inc., 2018)A compact hairpin line bandpass filter is presented with two different defected ground structures (DGS). The DGS are used to reduce the distributive response of the microstrip filter. The harmonic at 2 fo is suppressed to ... -
E-shaped H-slotted dual band mmwave antenna for 5G technology
Raheel, Kiran; Altaf, Ahsan; Waheed, Arbab; Kiani, Saad Hassan; Sehrai, Daniyal Ali; Tubbal, Faisel Em M.; Raad, Raad (MDPI AG, 2021)The aim of this work is to propose a dual band millimeter wave (mmwave) MIMO antenna system for 5G technology. In addition, the arrangement of the antenna elements in an array should be in such a manner that without using ... -
Eight element side edged framed MIMO antenna array for future 5G smart phones
Kiani, Saad Hassan; Altaf, Ahsan; Abdullah, Mujeeb; Muhammad, Fazal; Shoaib, Nosherwan; Anjum, Muhammad Rizwan; Damasevicius, Robertas; Blazauskas, Tomas (MDPI, 2020)This paper presents a novel design of a Multiple Input Multiple Output (MIMO) antenna system for next generation sub 6 GHz 5G and beyond mobile terminals. The proposed system is composed of a main board and two side boards. ... -
Future smartphone: MIMO antenna system for 5G mobile terminals
Abdullah, Mujeeb; Altaf, Ahsan; Anjum, Muhammad Rizwan; Arain, Zulfiqar Ali; Jamali, Abdul Aleem; Alibakhshikenari, Mohammad; Falcone, Francisco; Limiti, Ernesto (IEEE-Institute of Electrical and Electronics Engineers Inc., 2021)In this article, an inverted L-shaped monopole eight elements Multiple Input Multiple Output (MIMO) antenna system is presented. The multi-antenna system is designed on a low cost 0.8 mm thick FR4 substrate having dimensions ... -
A high gain MIMO antenna for fixed satellite and radar applications
Altaf, Ahsan; Mahmood, Khalid; Munir, Mehre; Kiani, Saad Hassan (Science and Information Organization, 2018)Patch antennas have emerged rapidly with advancement of communication technology. For antenna design purposes, Finite difference time domain (FDTD) method is a commonly used. This paper focuses on the interaction among ... -
Infinity shell shaped mimo antenna array for mm-wave 5g applications
Kamal, Mian Muhammad; Yang, Shouyi; Ren, Xincheng; Altaf, Ahsan; Kiani, Saad Hassan; Anjum, Muhammad Rizwan; Iqbal, Amjad; Asif, Muhammad; Saeed, Sohail Imran (MDPI AG, 2021)In this paper, a novel single layer Multiple Input–Multiple Output (MIMO) antenna for Fifth-Generation (5G) 28 GHz frequency band applications is proposed and investigated. The proposed MIMO antenna operates in the Ka-band, ... -
ISM band 1:16 wilkinson power divider
Altaf, Ahsan; Sajjad, Hassan; Khan, Sana; Munir, Mehre (Institute of Electrical and Electronics Engineers Inc., 2018)A 1:16 Wilkinson power divider (WPD) working from 1.3 GHz to 3 GHz is presented in this paper. Equal power division, phase and amplitude consistency is achieved among the output ports. The proposed design has a wideband ... -
Isolation improvement in UWB-MIMO antenna system using slotted stub
Altaf, Ahsan; Iqbal, Amjad; Smida, Amor; Smida, Jamel; Althuwayb, Ayman A.; Hassan Kiani, Saad; Alibakhshikenari, Mohammad; Falcone, Francisco; Limiti, Ernesto (MDPI, 2020)Multiple-input multiple-output (MIMO) scheme refers to the technology where more than one antenna is used for transmitting and receiving the information packets. It enhances the channel capacity without more power. The ... -
Lightweight and low-cost deployable origami antennas-a review
Shah, Syed Imran Hussain; Bashir, Shahid; Ashfaq, Mubashir; Altaf, Ahsan; Rmili, Hatem (IEEE-Institute of Electrical and Electronics Engineers Inc., 2021)The art of paper folding also known as Origami plays an important role in various research areas of different scientific fields. Origami structures possess many useful characteristics such as reconfigurability, flexibility, ... -
A linear array for short range radio location and application systems
Kiani, Saad Hassan; Mahmood, Khalid; Altaf, Ahsan (Science and Information Organization, 2018)Patch array antennas have primarily been good candidates for higher performance results in communication systems. This paper comprises of linear 1 × 4 patch antenna array study constructed on 1.575mm thick Roggers 5880 ... -
Microwave heating of heavy oil and bitumen
Arvas, Serhend; Sajjad, Hassan; Altaf, Ahsan; Khan, Sana; Arvas, Ercüment (Institute of Electrical and Electronics Engineers Inc., 2016)A theoretical study is presented for the feasibility of a microwave heating device that will raise the temperature of heavy oil and bitumen reservoir. The device is enclosed in a radome which is surrounded by a perforated ... -
Modified U-shaped resonator as decoupling structure in MIMO antenna
Iqbal, Amjad; Altaf, Ahsan; Abdullah, Mujeeb; Alibakhshikenari, Mohammad; Limiti, Ernesto; Kim, Sunghwan (MDPI, 2020)This paper presents an isolation enhancement of two closely packed multiple-input multiple-output (MIMO) antenna system using a modified U-shaped resonator. The modified U-shaped resonator is placed between two closely ... -
Mutual coupling reduction of MIMO antenna for satellite services and radio altimeter applications
Kiani, Saad Hassan; Mahmood, Khalid; Altaf, Ahsan; Cole, Alex J. (Science and Information Organization, 2018)Ground irregularities also known as defected ground structures (DGS) is a freshly presented innovatory way in designing of patch antennas to boost up the performance of antenna constraints. This study presents a novel ... -
Nature inspired MIMO antenna system for future mmWave technologies
Rahman, Saifur; Ren, Xin-cheng; Altaf, Ahsan; İrfan, Muhammad; Abdullah, Mujeeb; Muhammad, Fazal; Anjum, Muhammad Rizwan; Mursal, Salim Nasar Faraj; AlKahtani, Fahad Salem (MDPI, 2020)In this work, a new Multiple Input Multiple Output (MIMO) antenna system with a novel shape inspired by nature is proposed for Fifth-Generation (5G) communication systems. The antenna is designed on a Rogers 5880. The ... -
A novel EBG structure to improve isolation in MIMO antenna
Altaf, Ahsan; Alsunaidi, Mohammad; Arvas, Ercüment (Institute of Electrical and Electronics Engineers, 2017)A new, and advanced Electromagnetic Band Gap (EBG) structure is reported to reduce the mutual coupling between two tightly spaced rectangular patch antennas. The EBG structure provides more than 20 dB reduction in mutual ... -
A novel high GainWideband MIMO antenna for 5G millimeter wave applications
Sehrai, Daniyal Ali; Abdullah, Mujeeb; Altaf, Ahsan; Kiani, Saad Hassan; Muhammad, Fazal; Tufail, Muhammad; Irfan, Muhammad; Glowacz, Adam; Rahman, Saifur (MDPI, 2020)A compact tree shape planar quad element Multiple Input Multiple Output (MIMO) antenna bearing a wide bandwidth for 5G communication operating in the millimeter-wave spectrum is proposed. The radiating element of the ... -
Scattering by a chiral cylinder of arbitrary cross section above a dielectric half-space
Sajjad, Hassan; Altaf, Ahsan; Özzaim, Cengiz; Arvas, Ercüment (Institute of Electrical and Electronics Engineers Inc., 2021)A simple numerical solution for electromagnetic scattering from a 2-D homogeneous chiral cylinder of arbitrary cross section placed above a dielectric half-space (DHS) is presented. A modified surface equivalence principle ... -
Scattering from a chiral cylinder of arbitrary cross-section above a ground plane
Altaf, Ahsan (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)In this dissertation, a simple, accurate, and efficient solution is presented for the problem of scattering from a chiral cylinder of arbitrary cross-section above a ground plane. Both TM and TE excitations are considered. ... -
Scattering from chiral cylinders of arbitrary cross-sections above a ground plane
Altaf, Ahsan; Sajjad, Hassan; Özzaim, Cengiz; Arvas, Ercüment (IEEE-Institute of Electrical and Electronics Engineers Inc, 2021)The main purpose of this work is to solve the problem of electromagnetic scattering from a chiral cylinder of arbitrary cross-section above an infinite perfect electric conducting (PEC) plane. Using image theory, this ...
