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The design, development and characterisation of an inclined waveguide slot-based circularly polarised (CP) omnidirectional antenna at Ka-band frequency are described. The antenna consists of inclined slots on a circular waveguide and a coaxial feeding probe. All the radiating slots are fed by the TM01 mode of the circular waveguide to generate the omnidirectional pattern. Inclination of slots has...
An alternative approach, based on an iterative least square optimization technique, for the design of antenna array exhibiting equal side lobes in their radiation pattern. New and generalized expression for the array factor of all physically realizable linear antenna arrays with progressive phase shifts are introduced. The algorithm is based on the statistically computed signal analysis. By considering...
This paper presents ultra wide band circular fractal antenna. The antenna has been fed with coplanar waveguide (CPW) feed. This fractal antenna has been designed and fabricated on FR4 substrate εr = 4.3 and thickness h = 1.53 mm with initial diameter of solid circular disc 15 mm. The experimental result of circular fractal antenna exhibits the ultra wide band (UWB) characteristic from 3.295 GHz to...
This paper presents the design of an ultra wide band (UWB) antenna with CPW-fed. The antenna has been designed on FR4 substrate ??r = 4.3 and thickness 1.53 mm. The antenna has been fabricated and tested using VNA. The experimental results of this antenna offer ultra wide bandwidth from 2.86 GHz to 14.38 GHz. This corresponds to the impedance bandwidth 11.42 GHz and 132.48 %. The experimental results...
The present paper describes the design and development of a series fed 1 ?? 12 resonant slotted array antenna at 38 GHz. Slot dimensions, their spacing and positions have been calculated for broadside radiation pattern. Gain of 16 dBi with VSWR 1.5:1 and side lobe level better than 10 dB has been achieved. The designed antenna is a part of a planer antenna of 65 ?? 12 slotted Array. The designed antenna...
This paper describes the design, simulation and optimization of a shaped omni-directional circular waveguide antenna at 38 GHz. The proposed antenna consists of a rectangular waveguide, rectangular to circular transition, circular waveguide, metallic cone and a dielectric holder. The designed antenna has been simulated on ANSOFT HFSS EM Simulator using proper boundary conditions. Circular waveguide...
The paper discusses the design of dielectric rod antenna at D band which can be used as a feed for dielectric lens antennas. This feed replaces the metallic corrugated / dual mode horns which are difficult to fabricate at these frequencies. Tapering of dielectric rod has been done to achieve low side lobe level. The designed antenna has been simulated on 3D EM software HFSS (high frequency structure...
This paper presents the design of a star shaped circular microstrip fractal antenna. This star shaped circular microstrip fractal antenna has been designed on substrate with dielectric constant epsivr = 4.3 and thickness h = 1.53 mm. The antenna has been simulated using FDTD technique with dimension a = 40 mm. The simulated result shows the multiple resonances at 0.81 GHz, 1.47 GHz, 2.47 GHz and 3...
This paper describes the design and simulation of an Ultra Wide Band omni-directional antenna. The bandwidth of this antenna covers S, C, ext. C and X band frequencies. This bandwidth has been achieved by making a simple and easy modification in the design of a classical conical monopole (monocone) antenna. The achieved simulated results show stable radiation pattern over a specified field of view...
This paper presents the design of Fractal Microstrip Yagi Uda Antenna. This antenna has been modeled by incorporating fractal geometry in microstrip technology applying the conventional Yagi-Uda principle. The antenna has been designed on substrate epsivr =4.3 and h=1.53 mm using Sierpinski gasket. The Sierpinski gasket as Driver, Reflector and Director of height 80 mm, 83 mm, 77 mm respectively are...
This paper presents rectangular, fractal and proximity coupled patch antennas on single and multilayer substrate with and without air-gap. The antennas have been designed on epsivr = 4.3, h = 1.53 mm with initial dimension 36.08 x 29.6 mm of simple rectangular patch. The experimental resonant frequency fr of fractal patch with 2nd iteration is observed 2.11 GHz in comparison to rectangular patch 2...
This paper presents the size reduction of rectangular microstrip patch antenna. This antenna has been designed on substrate epsivr= 4.3, thickness 1.53 mm and simulated using FDTD code. The simple patch antenna with dimension 36.08 mm x 29.6 mm has been designed with center frequency of 2.33 GHz. In this patch, the slot of dimension 10 mm x 5 mm, 10 mm x 12 mm , and 10 mm x 15 mm has been created...
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