Syeda Fizzah Jilani

An Ultrawideband Monopole Fractal Antenna with Coplanar Waveguide Feed

A novel ultrawideband fractal antenna in monopole configuration is proposed. Wideband behavior and miniaturization is achieved using concentric heptagonal array structure. Coplanar waveguide is used to feed fractal antenna. Base shape for fractal antenna is heptagonal geometry. Final fractal shape is achieved by performing four base shape iterations. FR4 substrate is used for antenna fabrication. Simulated and measured results comparison shows a bandwidth of 7 GHz with 9 GHz center frequency. Radiation pattern of monopole fractal antenna is omni directional. Fundamental purpose of designing and fabricating UWB fractal antenna is its application in body area networks for remote patient health monitoring. Its application also includes C and X band frequencies.

Novel compact wide band coplanar waveguide fed heptagonal fractal monopole antenna for wireless applications

Novel Coplanar waveguide fed Monopole Fractal antenna design is proposed which is suitable for multiband applications. The Fractal heptagonal concentric array antenna provides the desired miniaturization and wide band behaviour simultaneously. Coplanar waveguide is used for impedance matching in wide frequency range. Proposed antenna is fabricated on Rogers RT/Duroid 5880 substrate. Antenna has center frequency of 10 GHz with a bandwidth of 10.3 GHz. It has low profile, physical compactness, optimum impedance matching, high gain, low VSWR values and omni directional radiation pattern. Proposed antenna can be used in various wideband wireless systems.

Flexible millimetre-wave frequency reconfigurable antenna for wearable applications in 5G networks

In order to keep pace with the growing research and development on millimetre-wave (MMW) antennas for the fifth generation (5G) networks, this paper integrates the frequency reconfigurability in a flexible antenna operating at MMW frequency spectrum. The proposed antenna is designed on liquid crystal polymer (LCP) substrate which is currently well recognised for its distinguishing performance at high frequencies. Antenna geometry consists of a radiating patch like a shape of tuning fork and two stubs which can be made part of radiating element by means of two switches. The proposed antenna offers a frequency reconfiguration over an operational frequency range of 20.7-36 GHz by four different switch configurations. Surface mount PIN diodes have been assembled on LCP substrate as a switch. Inkjet printing has also been suggested for antenna fabrication. The proposed antenna is well suited for wearable communication systems and body-centric applications for future 5G networks because of its notable features of conformity, light-weight, high-efficiency, and frequency reconfigurability.

Novel star-shaped fractal design of rectangular patch antenna for improved gain and bandwidth

A novel fractal design of conventional microstrip rectangular patch antenna is proposed. Gain and bandwidth of microstrip rectangular patch antenna is improved by addition of Star-shaped fractals at two sides and four corners of rectangular patch. A linearly polarized antenna is designed for 10 GHz and has directionality. Introduction of fractal geometry improved the gain from 5.479dB to 11dB and bandwidth from 550MHz to 5GHz with respect to simple rectangular patch. Bandwidth of 9GHz-14GHz has achieved covering X band and Ku band (according to IEEE standards). Likely applications areas for proposed design are radars, amateur radio operations, motion detectors, satellites, aerospace and communication systems.

Millimetre-wave T-shaped antenna with defected ground structures for 5G wireless networks

This paper presents a T-shaped antenna at millimetre-wave (MMW) frequency ranges to offer a number of advantages including simple structure, high operating bandwidth, and high gain. Defected ground structures (DGS) have been symmetrically added in ground in order to produce multiple resonating bands, accompanied by partial ground plane to achieve continuous operating bandwidth. The antenna consists of T-shaped radiating patch with a coplanar waveguide (CPW) feed. The bottom part has a partial ground plane loaded with five symmetrical split-ring slots. Measured results of antenna prototype show a wide bandwidth of 25.1-37.5 GHz. Moreover, simulation evaluation of peak gain of the antenna is 9.86 dBi at 36.8 GHz, and efficiency is higher than 80% in complete range of operation. The proposed antenna is considered as a potential candidate for the 5G wireless networks and applications.

Millimeter-wave conformal antenna array for 5G wireless applications

This paper presents a compact, flexible and wideband antenna array designed at millimeter-wave (MMW) frequencies for upcoming 5th generation (5G) applications. The concept of Franklin array is geometrically modified to transform a conventional narrowband antenna into wideband antenna array. Fabrication of antenna is accomplished by inkjet printing on a thin PET film to achieve conformity and flexibility. Measurements show that the designed array covers 24.6–30 GHz. Moreover, radiation pattern is directive and offers beam scanning at the desired angles with frequency sweep, like a leaky-wave antenna (LWA). The proposed antenna array is an attractive candidate for flexible and conformal wireless devices at MMW frequencies.

Novel millimeter-wave flexible antenna for RF energy harvesting

In this paper, a novel MMW flexible antenna has been proposed for energy harvesting applications. Antenna consists of a triangular patch printed on a flexible PET substrate. Defected ground structures (DGS) have been introduced to generate multiple resonances in order to improve bandwidth. It has been observed that the bandwidth and radiation characteristics are considerably improved by two square split-ring slots incorporated as DGS. Antenna is fabricated by inkjet printing. Measurements show that the dual band operation has been achieved with bandwidth of 15.9–19.7 GHz and 22.5–34 GHz for Band-I and Band-II respectively. Distinctive features of omnidirectional radiation pattern, significant gain profile combined with the flexibility of integration at non-uniform surfaces present this versatile antenna as a valuable contribution in emerging energy harvesting for future wireless networks at MMW spectrum.

Millimeter-wave frequency reconfigurable T-shaped antenna for 5G networks

Millimeter-wave reconfigurable antennas are predicted as a future of next generation wireless networks with the availability of wide bandwidth. A coplanar waveguide (CPW) fed T-shaped frequency reconfigurable millimeter-wave antenna for 5G networks is presented. The resonant frequency is varied to obtain the 10dB return loss bandwidth in the frequency range of 23-29GHz by incorporating two variable resistors. The radiation pattern contributes two symmetrical radiation beams at approximately ±30o along the end fire direction. The 3dB beamwidth remains conserved over the entire range of operating bandwidth. The proposed antenna targets the applications of wireless systems operating in narrow passages, corridors, mine tunnels, and person-to-person body centric applications.