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In this paper the analysis of a symmetrically notch loaded stacked circular disk patch antenna is carried out. It is found that the bandwidth of notch loaded disk antenna depends directly on the notch dimensions. Bandwidth of the notch loaded patch is found to be 27. 89 %. Stacking of the patch with parasitic element further improves the bandwidth to 43.56 %. Theoretical results are compared with...
A printed hexagonal monopole antenna fed by a coplanar wave-guide has been presented for ultra wide bandwidth. Parametric study of hexagonal configuration with vertex feed arrangement has been carried out to study the effect of feed gap on bandwidth. Experiments have been performed to measure, bandwidth and radiation patterns of this printed monopole antenna, which are in agreement with the simulated...
A multiple slot microstrip patch antenna for wireless communication is presented. In this paper, inverted microstrip patch antenna, direct probe feed technique and the novel multiple shaped patch is integrated. This antenna offers low profile, wide bandwidth, high gain, and compact antenna element. The proposed multi-slotted microstrip patch antenna achieves a fractional bandwidth of 27.89% (1.82...
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...
A novel design of aperture-coupled two-element equilateral triangular microstrip array antenna (ATEMSA) is proposed for multiband operation. A horizontal slot of optimum dimension if loaded at the center of radiating elements of ATEMSA, it converts multiband into single wideband without changing the nature of broadside radiation characteristics. The magnitude of impedance bandwidth is found to be...
Tri-band BSF working at C, Ku and K band has been developed using a single topology. The designed 3-in-1 filter posses compactness, wider bandwidth, and low insertion loss. The proposed topology is constructed using spurline filter at the output connected with a section of anti-coupled lines. The filter with the presented approach can be used to shift the frequency at the desired location by optimizing...
The simulated and measured results of a right triangular microstrip patch antenna (30deg - 90deg - 60deg) with and without air gap are presented in this communication. A right triangular patch antenna resonates at a single frequency but on application of small air gap of 1.5 mm between radiating patch and ground plane, it not only resonates at two frequencies but also shows marked improvement in its...
In this paper, we are going to discuss about the current trends in the design of Microstrip M patch antenna intended for various applications and it is a innovative nature never tried out earlier. This opens up a new avenue for different frequency ranges and new applications yet easily realizable with maximum advantages. In rectangular micro strip patch antennas [RMSA] with negative capacitance and...
A new circular polarization (CP) design for single-feed microstrip patch antennas is presented and studied. The proposed design is much simpler in construction compared to the traditional wide-band patch antenna. For the desired results, two slots are inserted into the patch antenna. Bandwidths as high as 10% are achieved with stable pattern characteristics, such as gain and cross polarization, within...
The paper presents the radiation performance of an elliptical (a=15 mm, b=10.5 mm) patch antenna having circular slot (R=4.8 mm) designed on glass epoxy FR4 substrate and its performance is compared with a simple elliptical patch antenna without slot. The simulation results for this antenna are obtained with available IE3D simulation software by varying semi major axis (a) and semi minor axis (b)...
In this paper, an inward scaled loop antenna (ISLA) is presented. It is created by successive scaling and rotating and fitting the scaled copies of a wideband loop antenna (WBLA) in the empty space available in it. The overall size of the antenna remains the same as that of the WBLA. The advantage of an ISLA is its improved input performance as compared to the WBLA. Impedance bandwidth of the order...
The theoretical investigations on tunnel diode loaded stacked microstrip antenna is presented using circuit theory concept based on modal expansion cavity model. The investigations reveal that better tunability, better matching and enhanced bandwidth of the stacked antenna can be achieved by adjusting bias voltage of tunnel diode only while the antenna topology remains unaltered. The operational frequency...
An Asymmetric Coplanar Strip (ACS) fed uniplanar antenna for wide band applications is presented. The resulting antenna offers a 2:1 VSWR bandwidth greater than 100% from 1.65 GHz to 5.06 GHz covering the DCS/PCS/IEEE 802.11a/WiMAX bands. The antenna has an overall dimension of 44 mm X 35 mm when printed on a substrate of dielectric constant 4.4 and height 1.6 mm. The wide band width is obtained by...
A new elliptical ultra-wideband fractal antenna with elliptical iterations is presented in this paper. The proposed antenna is based on Descartes Circle Theorem (DCT). The proposed structure is fed by the 50 Omega microstrip line. The antenna is fabricated on a 1.59 mm thick FR-4 (relative permittivity of 4.4) substrate. The antenna structure is analyzed using a transmission line matrix (TLM) method...
A new wide-band direct conversion receiver based on Five-port structure is presented that is very suitable for software radio applications. New five-port structure consists of five wideband power splitters and a 900 phase shifter, including a set of composite right/left-handed (CRLH) transmission line (TL) sections. As an example the transceiver is designed for covering three WiMAX frequency bands,...
In this paper we will report analysis of a quantum-well (160 Aring QW) Transistor Laser with 150 mum cavity length using a charge control model in order for modifying QW location through base region. The analysis shows significant enhancement, at constant bias currents, in optical bandwidth due to moving the QW in the direction of collector-base junction. No remarkable resonance peak, limiting factor...
In recent days, various microwave absorbers are used for electromagnetic interference and compatibility measurements in anechoic and semi-anechoic chambers. The authors have synthesized three different polymer composites of epoxy resin modified by urea formaldehyde and silicon urea formaldehyde of different wt%. The samples were made as small films of specific dimension in order to test them in the...
In this paper, design and development of rectangular sleeve dipole antenna covering more than an octave bandwidth (850-2500 MHz) is presented with measured results. Here a rectangular box type of sleeve is proposed over the cylindrical dipole elements. This antenna is compact in size and covers more than 2.9:1 bandwidth with maximum VSWR 3:1. The antenna was first simulated using CSTtrade microwave...
This paper presents the design and development of sequentially rotated broadband circularly polarized stacked patch array antenna for data & voice communication in MSS service. A Sequential rotation technique is used for improvement in axial ratio in 2 times 2 array environment. The driven element is Electromagnetically Coupled square patch with dual edges fed by T power divider. A parasitic patch...
The analysis of V- slot loaded antenna stacked with simple patch is carried out using equivalent circuit model. It is found that stacked patch antenna exhibits enhanced bandwidth that depends on various dimensions of the V-slot. The proposed theoretical results are compared with simulated and reported experimental results which are in good agreement.
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