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Adopting the sub-optimal vector in the mutant operation and introducing dynamic updating of the parameters, Competition Differential Evolution Strategy (CDES) is proposed to synthesize a main beam with optimized polarization in conformal arrays. An example of circular polarized patch antennas array conformal to a spherical surface is presented. Simulated radiation pattern data for the patches are...
This article studied a novel Log-Periodic Dipole Antenna (LPDA) with distributed inductive load for size reduction. By adding a short circuit stub at top of the each element, the dimensions of the LPDA are reduced by nearly 50% compared to the conventional one. The impedance bandwidth of the presented antenna is nearly 122% (54∼223MHz) (S11<10dB), and this antenna is very suited for BROADCAST and...
A novel circular slot antenna is proposed for wireless local area network (WLAN) applications. By applying a monopole on the opposite side of the circular slot etched on the ground plane, a resonant frequency band is excited at about 2.4 GHz, with impedance bandwidth (return loss > 10 dB) from about 2.3 to 2.8 GHz, which covers WLAN 2.4 GHz and worldwide interoperability for microwave access (WiMAX)...
A novel coplanar waveguide-fed triple-band antenna with omni directional radiation patters in the azimuth plane is proposed. The proposed antenna consists of a rectangular patch monopole with a Π-shaped slot. It can provide three separate impedance bandwidths of 27%, range from 2.22 to 2.89GHz; bandwidth of 15%, range from 3.18 to 3.71GHz; and bandwidths of 22%, range from 5.09 to 6.33GHz, respectively,...
Two novel calibration and remedy methods of amplitude and phase error for Triple-dipole sensor are proposed in this paper. The computational formulas of the channel errors are derived in this paper by using the time sample data of ideal and nonideal triple-dipole sensor. Finally, simulation results verify the effectiveness of the new algorithm.
Based on the difference between ideal electromagnetic vectors and misorientation electromagnetic vectors, a novel estimation method using two reference signals with unknown parameters is presented. When electromagnetic vector sensor array misorientates, the vector sensor deviates from its normal orientation and error is caused. Subspace algorithm based on eigenvalue decomposition is very sensitive...
This paper described the design of microstrip array antenna with operating frequency at 5.8 GHz. The antenna element is realized by the single-layer inset-fed patch antenna with the size of antenna element determined by the operating frequency. The proposed array antenna consists of 12 elements, with all elements arranged symmetrically on two concentric circles. The array factor is calculated by Matlab...
This article presents the design of a novel ultra-wideband microstrip fed planar monopole antenna with dual band-notched characteristics. The shape of the antenna is a smiling face with double braids; its lovely and simple design has advantage to beatify the product By etching a mouth-shaped slot in the radiating patch and adding a double braids-shaped strip on the top, the dual notched bands for...
In this paper, a novel corner-truncated patch scheme is described to enhance the operation bandwidth of the open slot antenna for UWB applications. By truncating two corners from the rectangular patch, the bandwidth enhancement of the proposed open slot antenna is well realized. From the simulation and measurement results, it is shown that the corner-truncated patch scheme is an excellent approach,...
In this paper, the method of geometric optics is applied to investigate wave propagation in a negative-graded refractive index lens with an anisotropic medium based on a presented modified eikonal equation valid for the most general form of an anisotropic or chiral medium. The far fields are obtained by means of the computed geometric optics field on the surface of the lens. The method is easily degenerated...
A novel design of a dual-frequency circularly polarized annular ring slot antenna is presented. The dual-frequency characteristic is achieved using a single-layer double-bent microstripline-fed configuration coupled to a dual-annular ring slot antenna. The 10 dB return loss impedance bandwidths (VSWRles2) for the lower and higher band are 31.3% and 10.6%, respectively. The 3 dB axial-ratio bandwidths...
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