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The effect of polygonal slot in vertex-fed polygonal patch antennas is studied and analyzed. A polygonal shaped slot is obtained by creating a polygonal slot at the center of polygon. Here, the pentagonal and hexagonal shaped slot is created at the center of a pentagon and a hexagon. Pentagonal and hexagonal shaped slotted patch designs are simulated for different radius of slot (R2) formed when vertices...
In this work a different approach to widen the bandwidth of an electrically small antenna is proposed. Unlike other methods reported in literature the idea explored here uses the feeding network to improve the bandwidth. The methodology is illustrated using a circular patch antenna for testing purposes, but there is no fundamental reason why this approach would not work for other types of antenna...
A practical lumped element method to model conducted emissions in a step-down DC-DC converter up to 100 MHz is presented. The higher frequency was chosen to enable radiated emission problems due to high switching frequencies to be identified using a relative easier conducted measurement setup. The model and measurements were based on MIL-STD-461F method for conducted emissions, which calls for conducted...
Analysis of ultra-wideband antenna for Sectoral shaped microstrip patch for angle increasing from 90° to 330°, for realized bandwidth and gain is presented. To optimize the individual patches, center or offset feed microstrip line is used. A bandwidth of around 15 GHz is obtained, in Sectoral patches with angle increasing from 90° to 180°, whereas for Sectoral patches with angles increasing from 210°...
The increase of grid-tied distributed generators (DGs) and nonlinear loads may generate harmful low order harmonics, polluting the grid and deteriorating the operation of other power electronics based loads and DGs. In order to improve the output current of the voltage source inverter (VSI) in grid-tied DG system, two methods are proposed in this paper to compensate the output harmonic under distorted...
A rectangular slot Micro strip Patch Antenna is designed with frequency ranging from 3 GHz to 12GHz with dual band function with its one band from 5–8.7 GHz frequency range and bandwidth of 3.7 GHz (calculated below −10dB) and another band operating on frequency range from 9.4–12GHz with bandwidth of 2.6 GHz (calculated below −10dB). Former is used for WLAN application and later for motion detectors...
Modified rectangular shape ultra wide band microstrip antenna with microstrip line feed is proposed. The effects of tapering structure on the realized bandwidth are discussed. The tapered end configuration yields bandwidth of 15.4 GHz with a peak gain of 2 dBi. Further, the effect of replacing the tapered end structure with an elliptical base structure is investigated. The elliptical base antenna...
An Ultra wide band wearable antenna with coplanar waveguide feed is presented in this paper. The antenna was designed and fabricated in jeans substrate. A coplanar feed of 50 Ohm impedance was used so as to provide the antenna a uniplanar structure. The simulation results showed ultra wide band characteristics with return loss below -10dB for the entire band of 3.1GHz to 10.6GHz. The antenna was fabricated...
High impedance surface has found promising application as antenna ground plane. This paper presents the analysis of a 2.6 GHz low profile folded dipole over High Impedance Surface. The antenna can operate over the frequency range(2.5GHz-2.7GHz) in the MMDS band. The unit cell of HIS, Folded dipole and its feed network has been modeled and optimized using FDTD tool. Feed network comprises of BALUN...
Due to the mutual coupling between the different excited ports, designing multiple wideband matching circuits for handset antennas is not straightforward. This paper presents design principles for wideband matching circuits of two-ports and analyzes their significance in the case of multiple noncontiguous frequency bands. The proposed optimization procedure helps to design matching circuits, which...
A linear three-element slot antenna array with intentionally strong mutual coupling between the elements, a so-called connected array, is presented. By simultaneously feeding all three ports of the array, at different frequencies over an octave bandwidth and with different phases, feed-port reflection coefficients with magnitude larger than one, or negative active feed impedances, can occur. A reactive...
Advances in Planar Ultra-wideband Modular Antenna (PUMA) array architecture which have culminated into a 6∶1 bandwidth design without the use of an external backplane matching network are presented. This paper will examine the additional bandwidth-enhancing operational principles of the proposed dual-polarized 6∶1 PUMA array. A design and its respective full-wave simulations will then be presented,...
We present a design for an electronic-steerable holographic antenna with polarization control composed of a radial array of Ku-band, electronically-steerable, surface-wave waveguide (SWG) artificial-impedance-surface antennas (AISA). The antenna operates by launching surface waves into each of the SWGs via a central feed network. The surface-wave impedance is electronically controlled with varactor-tuned...
A novel high gain circular disc antenna configuration is proposed. The antenna is a stacked configuration of two circular discs, designed to operate in TM11 and TM13 modes. The working principle is based upon the radiated field superposition of TM11 and TM13 modes. The antenna has a broadside gain of 13.86dB with a SLL of −13dB. Effect of ground plane size on sidelobelevel is presented.
The performance of superstrate antenna is analyzed using a fast full-wave scheme, based on the Contour-FFT, which rapidly calculates the substrate-related interactions between macro basis functions (MBFs) in spectral domain. In this paradigm, the interaction between MBFs versus relative position is tabulated first using C-FFT, then the interaction between printed elements on superstrate layer of the...
A wideband antenna has been aerodynamically functionalized for flight capability. The antenna is based on a planar dipole/Vivaldi metallization scheme. The aerodynamic structure was based on the Nutball flier, a hobbyist flight architecture. The resulting codesign achieved a large VSWR 2∶1 bandwidth from 100 MHz to over 2 GHz and omnidirectional dipole-like radiation patterns at the lower frequency...
In this paper a Sierpinski fractal bowtie microstrip antenna is proposed. From some experiments, the multiband behavior of these antennas types will be demonstrated. In order to obtain a broadband operation, changes in radiator element, in feed system and in ground plane were applied. Feed system uses microstrip line with quarter-wave transformers designed through the binomial sequence and on Tschebyscheff...
This paper presents experimental results on several self-complementary bow-tie antenna arrays populated with rectifier diodes. Results with two different diodes are compared, and the number of diodes, antenna polarization, DC load, DC connection (parallel/series) and incident power density are varied. The transmitter is in the far field and the incident power density ranges from 10 to 125µW/cm2 at...
This paper presents bandpass filter designs using a star type loop resonator. Both single mode and dual mode microstrip filters are designed. A small triangular patch element is used to perturb the fields and couple the dual degenerate modes for constructing dual mode bandpass filter. Two single mode filters are designed and results show chebyshev like characteristics. The dual mode filter exhibits...
This paper puts forward an optimized stepped impedance resonator (SIR)-based filter design which is able to optimize the frequency selectivity of the filters by means of an improved filter feeding method. This paper provides a filter design based on SIR. With this design, the zero-degree feeding structure can be achieved through the adjustment of the positions to tap feed lines. The frequency selectivity...
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