A CPW‐fed antenna with the circular shaped form with the slots for UWB application

Abstract

frequencies of the bandwidth although the level of reflection is significantly decreased in overall compared with the initial design. The optimum designs for the case of two and four protruding vias are shown in Table 2. The responses corresponding to these designs are shown in Figures 6(b) and 6(c). CONCLUSIONSWe demonstrate a technique to broaden the useable bandwidth of the CBCPW-to-SIW transitions. The transition structures are modified by introducing-as the tuning elements-metalized vias partially protruding into the substrate in the transition region. The vias can be easily implemented within the SIC/SIW manufacturing technology. The transition geometry as well as the location and the size of extra vias are adjusted using the adaptive design specifications algorithm exploiting coarse-discretization EM transition models. This allows us to find the optimal designs at a low-computational cost. 10. N.V. Queipo, R.T. Haftka, W. Shyy, T. Goel, R. Vaidynathan, and P.K. Tucker, Surrogate-based analysis and optimization, Prog Aerosp Sci 41 (2005), 1-28. 11. CST Microwave Studio, ver. 2010, CST AG, CST Microwave Studio Germany, 2010. 12. T.G. Kolda, R.M. Lewis, and V. Torczon, Optimization by direct search: new perspectives on some classical and modern methods, SIAM Rev 45 (2003), 385-482. 13. S. Koziel, Adaptively adjusted design specifications for efficient optimization of microwave structures, Prog Electromagn Res B (PIER B) 21 (2010), 219-234.ABSTRACT: A novel ultra wideband (UWB) antenna with coplanar waveguide (CPW) feed, consisting of a circular patch and a ground ABSTRACT: A novel ultra-wide band bandpass filter with notched band is presented. Multi-mode resonator is realized using a stepped-impedance slotline. The resonator is orthogonally coupled to the microstrip feed lines, and ultra-wide passband is obtained. Microstrip open loop resonators are loaded on the slotline, and notched band from 5.1 to 5.3 GHz is achieved. The filter is designed, fabricated, and measured. Good agreement is achieved between measured and predicted results.

Artificial bee colony algorithm based modified circular‐shaped compact hybrid fractal antenna for industrial, scientific, and medical band applications

“…The value of the radius is computed from Equations 1, 2. 33,34 The defected ground plane is selected for the proposed CCHFA because it allows the antenna to resonate in the desired ISM band. ABC algorithm is used to optimize the length 'L g ' of defected ground plane.…”

Microwave and millimetre wave antipodal Vivaldi antenna with trapezoid‐shaped dielectric lens for imaging of construction materials

“…The major challenge and novelty comes from the development of the UWB antennas for these systems with relatively small dimensions and high performance. For example, the engineering/design tradeoff is between small UWB antennas that are omnidirectional [12][13][14] and directional UWB antennas [15], such as horn antennas, that are bulky. The Vivaldi antenna is an attractive candidate for microwave and millimetre wave imaging applications due to its planar structure, low profile, light weight, and theoretically infinite bandwidth.…”

Slot cut printed elliptical UWB monopole antenna

“…With the advancement of wireless system technology, the demand for printed and small antennas has increased and hence several printed ultra‐wideband (UWB) compact antenna configurations have been proposed . Printed elliptical monopole antenna (PEMA) is reported to cover entire UWB range, which gives maximum impedance bandwidth (BW) for ellipticity ratio of 1:1, as compared to other regular shapes like circular, rectangular, square, triangular, etc.…”

“…When two pairs of elliptical slots, with optimized smaller dimensions, are cut inside the elliptical patch, they have higher resonance frequency and also influence higher order modes of the overall elliptical patch. Thus, these pair of slots, influence surface current distributions at the higher order modes . The optimization of dimension of these slots and feed configuration, leads to an increase in higher end of the BW in comparison with a simple PEMA.…”