Sarthak Singhal

Hexagonal tree shaped ultra–wideband fractal antenna

ABSTRACT A compact hexagonal tree shaped fractal antenna for ultra–wideband (UWB) applications is presented. The bandwidth has been enhanced by using modified feedline and semi-circular ground plane. The impedance bandwidth of 2.5–16 GHz (146%) has been achieved. The proposed second iteration fractal antenna has nearly omnidirectional patterns at its resonance frequencies with an average gain of 4 dB. The simulation and experimental results are found to be in good agreement. The antenna exhibits better reflection coefficient performance along with reduced dimensions as compared to ones reported earlier.

CPW-fed circular-shaped fractal antenna with three iterations for UWB applications

A coplanar waveguide (CPW)-fed circular-shaped fractal antenna with third iterative orthogonal elliptical slot for ultra-wideband applications is presented. The bandwidth is enhanced by using successive iterations of radiating patch, CPW feedline, and tapered ground plane. An impedance bandwidth of 2.9–20.6 GHz is achieved. The designed antenna has omnidirectional radiation patterns along with average peak realized gain of 3.5 dB over the entire frequency range of operation. A good agreement is observed between the simulated and experimental results. This antenna structure has the advantages of miniaturized size and wide bandwidth in comparison to previously reported fractal structures.

Rotated Quadrilateral Dipole UWB Antenna for Wireless Communication

A double printed rotated quadrilateral dipole UWB antenna for wireless communication is presented. The rotation of quadrilateral and modification of integrated balun structure is employed to enhance bandwidth and impedance matching. The proposed antenna shows impedance bandwidth of 3.8–18.1 GHz which covers the entire C, X and Ku bands. The radiation patterns of the designed antenna structure are relatively stable and omnidirectional over the entire obtained bandwidth with an average gain of 3.6 dB. A good agreement is found between the simulated and experimental results. The proposed antenna has a simple design, comparatively compact size and more bandwidth than previous reported double rhombus antenna.

CPW-Fed Phi-Shaped Monopole Antenna for Super-Wideband Applications

A compact Phi-shaped monopole antenna for super wideband applications is proposed. It consists of a Phi-shaped radiator derived from a conventional elliptical monopole and quarter elliptical CPW ground plane. An impedance bandwidth from 3.5 to 37.2 GHz is achieved with a ratio bandwidth of 10 : 1. It provides an average peak realized gain of 3.5 dB with a group delay of less than 0.5 ns. The proposed antenna structure provides large bandwidth with the advantage of miniaturized dimensions compared to other SWB antenna structures.

Microstrip fed star super wideband fractal antenna

A microstrip line fed star fractal antenna for super wideband applications is presented. Second iterative star shaped fractal geometry of the radiator, modified feedline and notch loaded semi-elliptical ground plane are used to achieve an impedance bandwidth of 4.6–52 GHz. A good agreement is observed between the simulated and experimental results. It has an overall volume of 19.7×19×1.6 mm3. It has advantages of miniaturized dimensions and wider bandwidth over previously reported structures.

Hex-Sided Rounded Dipole Antenna (HSRDA) For UWB Applications

Abstract A hex-sided rounded dipole antenna (HSRDA) for UWB applications is presented. It is designed by the addition of semi-elliptical patch sections at the edges of a square bow-tie antenna. The antenna structure is fed by a modified microstrip feedline for better impedance matching. An impedance bandwidth of 2.9–11.4 GHz is achieved. The antenna structure has quasi omnidirectional radiation patterns and reasonable gain over the same frequency range. A good agreement between the experimental and simulation results is observed. The proposed antenna structure has miniaturized size for the same bandwidth as compared to already reported antenna structures.

CPW-Fed 8-Shaped Monopole Antenna for Ultra Wideband Applications

Abstract A CPW-fed 8-shaped monopole antenna for ultra wideband applications is presented. It consists of a 8-shaped monopole and two quarter elliptical coplanar waveguide ground planes. An impedance bandwidth from 5.4 GHz to 23.83 GHz is achieved. The radiation patterns are observed to be omnidirectional and bidirectional in E-and H-plane respectively at lower resonances. At higher frequencies, the radiation patterns are found to be nearly omnidirectional in both planes. The group delay variation is also observed to be constant in the operating frequency range. A good agreement is found between the simulation and experimental results. The designed antenna structure has miniaturized dimensions and wider bandwidth as compared to other already reported monopole structures.

CPW-fed Phi shaped SWB monopole antenna

A compact CPW-fed Phi shaped super wideband monopole antenna is presented. An impedance bandwidth of 3.8 to 38 GHz is achieved by using phi shaped radiator, coplanar waveguide feedline and quarter elliptical ground plane. It provided good radiation performance characteristics. A good agreement between the simulated and experimental results is achieved.

Novel diamond shaped UWB monopole antenna

A novel compact microstrip line fed diamond shaped monopole antenna for Ultra Wideband (UWB) applications is proposed. The antenna structure consists of a diamond shaped radiating patch and a semicircular like ground plane. The radiating patch is derived from a conventional rectangular patch antenna. The simulated results show that the impedance bandwidth (VSWR ≤ 2) of the proposed antenna ranges from 0.8409 to 15.5109 GHz (179.4%) and 16.7679 to 18.3753 GHz (9.15%).

Broadband microstrip antenna using radiating edge coupled parasites

Abstract - A method of increasing the bandwidth of MPA by using two additional resonator gap coupled to the radiating edges of the rectangular patch is described. The simulated result are in good agreement with experimental and theoretical results. The result are simulated by MOM based IE3D software I. INTRODUCTION Due to the several advantages of microstrip antenna such as low profile simple and inexpensive to manufacture and compatible with MMIC design. They are used in the aircraft, satellite, missile wireless and mobile communication. For linearly polarized microstrip antennas, the bandwidth is limited by variations of the input impedance and a commonly used definition for bandwidth is the frequency range over which input voltage standing wave ratio (VSWR) is less than two. The major disadvantages of the microstrip antenna are narrow bandwidth and low frequency. The bandwidth can be increased by using the various technique such as by using thicker substrate, by decreasing the dielectric constant, by using the gap coupled multiple resonators, by loading a patch, trapezoidal shaped antennas, parasitic strips capacitively coupled to the non-radiating edges of square patch antenna, rectangular antenna with its radiating edge gap-coupled to the quarter wavelength short-circuited parasitic element, multilayer structures, staggers tuned resonators, log-periodic structures, quasi-log-periodic structures etc.