Tanweer Ali

Bio: Tanweer Ali is an academic researcher from Manipal University. The author has contributed to research in topics: Antenna (radio) & Ground plane. The author has an hindex of 16, co-authored 90 publications receiving 823 citations. Previous affiliations of Tanweer Ali include Reva Institute of Technology and Management & Manipal Institute of Technology.

A miniaturized metamaterial slot antenna for wireless applications

Abstract: A novel miniaturized five band metamaterial inspired slot antenna is reported. The proposed design consists of a ring monopole and metamaterial Rectangular Complementary Split Ring Resonator (RCSRR) as the radiating part, two L and one T–shaped slot as the ground plane, respectively. Miniaturization in the proposed design is accomplished by metamaterial RCSRR, and also, it helps the antenna to operate at 2.9 and 5.2 GHz frequency bands. The aforementioned miniaturization process leads to about 46.8% reduction in volume of the proposed design, as compared to the conventional antenna. The pass band characteristics of the metamaterial RCSRR through waveguide medium are discussed in detail. In order to enhance the operating abilities of the miniaturized antenna, slots are etched out in the ground plane, thereby making the miniaturized antenna further operate at 2.4, 5.6 and 8.8 GHz, respectively. The proposed design has an active patch area of only , with dB bandwidth of about 4.16% (2.35–2.45 GHz), 5.71% (2.63–2.76 GHz), 10.25% (4.44–4.92 GHz), 6.25% (5.42–5.77 GHz) and 2.39% (8.68–8.89 GHz) in simulation, and about 6.86% (2.25–2.41 GHz), 5.01% (2.55–2.7 GHz), 9.16% (4.58–5.02 GHz), 5.38% (5.79–6.11 GHz) and 5.42% (8.44–8.91 GHz) in measurement. The antenna has good impedance matching, acceptable gain and stable radiation characteristics across the operational bandwidths.

A multiband reconfigurable slot antenna for wireless applications

Abstract: This research presents a novel four band frequency reconfigurable antenna for 1.6 (Global Navigation Satellite system (GNSS)), 2.5 (Lower Worldwide Interoperability for Microwave Access (WiMAX)), 5.8 (Wireless local area network (WLAN)) and 9.8 GHz (X-band) frequency bands. The antenna has a compact size of 0 . 18 λ 0 × 0.18 λ 0 × 0.0096 λ 0 at lower resonance of 1.8 GHz and is printed on FR4 material with height (h) = 1.6 mm, dielectric constant ( ( e r ) = 4.4 and loss tangent ( δ ) = 0.02. Multiband phenomenon in the antenna is achieved by etching trapezoidal slot in the radiating monopole and rectangular slots in the ground plane. Frequency reconfiguration in the proposed structure is achieved by placing PIN diode switch between rectangular slot placed in the ground plane. During OFF state, the antenna exhibit quad band with S11

A multiband antenna loaded with metamaterial and slots for GPS/WLAN/WiMAX applications

Abstract: A compact planar four band antenna loaded with metamaterial and slots for GPS, WLAN, and WiMAX applications, is presented in this letter. Initially, a dualband (2.9 and 5.9 GHz) antenna is designed by etching trapezoidal shaped slots in the radiating patch and rectangular shaped slots in the ground plane. In order to make the dual band antenna to operate at more number of bands, two identical metamaterial unit cells are introduced in the ground plane. The introduction of metamaterial creates additional resonance at 1.5 and 5.2 GHz, respectively. The proposed design has a dimension of 0.21k03 0.23k030:01k0 at a lower frequency of 2.4 GHz, and operates at 1.5 (GPS), 2.4, 5.2 (WLAN), and 3.5 GHz (WiMAX) frequency bands, respectively. The proposed metamaterial negative permeability retrieval mechanism through waveguide medium is discussed in detail. The proposed design has measured S11 < 210 dB bandwidth of about 6.06% (1.6–1.7 GHz), 8.33% (2.3–2.5 GHz), 5.55% (3.5– 3.71 GHz), and 5.94% (4.9–5.2 GHz), respectively. Good impedance matching, stable radiation characteristics with low cross-polarization and an average gain of 2.25 dBi, are observed across the operational bandwidths, when the antenna is fabricated and tested.

A miniaturized metamaterial slot antenna for wireless applications

Abstract: A novel miniaturized five band metamaterial inspired slot antenna is reported. The proposed design consists of a ring monopole and metamaterial Rectangular Complementary Split Ring Resonator (RCSRR) as the radiating part, two L and one T–shaped slot as the ground plane, respectively. Miniaturization in the proposed design is accomplished by metamaterial RCSRR, and also, it helps the antenna to operate at 2.9 and 5.2 GHz frequency bands. The aforementioned miniaturization process leads to about 46.8% reduction in volume of the proposed design, as compared to the conventional antenna. The pass band characteristics of the metamaterial RCSRR through waveguide medium are discussed in detail. In order to enhance the operating abilities of the miniaturized antenna, slots are etched out in the ground plane, thereby making the miniaturized antenna further operate at 2.4, 5.6 and 8.8 GHz, respectively. The proposed design has an active patch area of only , with dB bandwidth of about 4.16% (2.35–2.45 GHz), 5.71% (2.63–2.76 GHz), 10.25% (4.44–4.92 GHz), 6.25% (5.42–5.77 GHz) and 2.39% (8.68–8.89 GHz) in simulation, and about 6.86% (2.25–2.41 GHz), 5.01% (2.55–2.7 GHz), 9.16% (4.58–5.02 GHz), 5.38% (5.79–6.11 GHz) and 5.42% (8.44–8.91 GHz) in measurement. The antenna has good impedance matching, acceptable gain and stable radiation characteristics across the operational bandwidths.

A multiband reconfigurable slot antenna for wireless applications

Abstract: This research presents a novel four band frequency reconfigurable antenna for 1.6 (Global Navigation Satellite system (GNSS)), 2.5 (Lower Worldwide Interoperability for Microwave Access (WiMAX)), 5.8 (Wireless local area network (WLAN)) and 9.8 GHz (X-band) frequency bands. The antenna has a compact size of 0 . 18 λ 0 × 0.18 λ 0 × 0.0096 λ 0 at lower resonance of 1.8 GHz and is printed on FR4 material with height (h) = 1.6 mm, dielectric constant ( ( e r ) = 4.4 and loss tangent ( δ ) = 0.02. Multiband phenomenon in the antenna is achieved by etching trapezoidal slot in the radiating monopole and rectangular slots in the ground plane. Frequency reconfiguration in the proposed structure is achieved by placing PIN diode switch between rectangular slot placed in the ground plane. During OFF state, the antenna exhibit quad band with S11

Design and analysis of a hexa-band frequency reconfigurable antenna for wireless communication

Abstract: A compact (33 × 16 × 1.6 mm3) and novel shaped hexa-band frequency-reconfigurable antenna with a very wide tuning band is proposed. The proposed antenna operates at two single band modes (i.e., 3.5 GHz and 4.8 GHz) and two dual band modes (i.e., 2.10 GHz, 4.15 GHz and 2.4 GHz, 5.2 GHz) depending upon the switching states. The lumped elements are used in the simulation environment to achieve tunable capacitance, which is responsible for frequency reconfigurability. The measured tuning capability of the fabricated antenna ranges from 2.1 to 5.2 GHz. The proposed antenna has a VSWR 1.3 for all the resonant bands. The radiation efficiency of the proposed structure ranges from 80.41% to 96% at the corresponding frequencies. The far field and the scattering parameters of the proposed antenna are analyzed using Computer Simulation Technology (CST) Microwave Studio 2014. The designed antenna, due to its compact and affordable geometry, can be easily integrated in the modern communication devices such as smart phones, laptops and other portable electronic devices. A prototype of the designed antenna is fabricated and measured using PIN diode switches to validate the simulation results. The proposed reconfigurable antenna demonstrates a reasonable agreement between the measured and simulated results.

A multiband antenna loaded with metamaterial and slots for GPS/WLAN/WiMAX applications

Abstract: A compact planar four band antenna loaded with metamaterial and slots for GPS, WLAN, and WiMAX applications, is presented in this letter. Initially, a dualband (2.9 and 5.9 GHz) antenna is designed by etching trapezoidal shaped slots in the radiating patch and rectangular shaped slots in the ground plane. In order to make the dual band antenna to operate at more number of bands, two identical metamaterial unit cells are introduced in the ground plane. The introduction of metamaterial creates additional resonance at 1.5 and 5.2 GHz, respectively. The proposed design has a dimension of 0.21k03 0.23k030:01k0 at a lower frequency of 2.4 GHz, and operates at 1.5 (GPS), 2.4, 5.2 (WLAN), and 3.5 GHz (WiMAX) frequency bands, respectively. The proposed metamaterial negative permeability retrieval mechanism through waveguide medium is discussed in detail. The proposed design has measured S11 < 210 dB bandwidth of about 6.06% (1.6–1.7 GHz), 8.33% (2.3–2.5 GHz), 5.55% (3.5– 3.71 GHz), and 5.94% (4.9–5.2 GHz), respectively. Good impedance matching, stable radiation characteristics with low cross-polarization and an average gain of 2.25 dBi, are observed across the operational bandwidths, when the antenna is fabricated and tested.