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Although the proposed antenna does not completely fulfill the10 dB matching requirement of the ECC UWB band entirely, it qualifies itself as a good candidate for UWB applications requiring radiation to one side only. The antenna's high gain makes it suitable for directional radio systems, e.g. in the medical field for communication with a pacemaker implant. For this purpose, further investigations...
A three port triple band aperture coupled microstrip antenna has been designed, manufactured and measured. Effective impedance matching has been achieved in desired bands of operation in good agreement with the simulated results.
An X-band conformal array antenna designed for the use of unmanned aerial vehicles with polarimetric radars/sensors is presented. The array antennas mounted on the cylinder with various curvature radii are experimentally studied. The array can be easily placed on the aircraft fuselage or payload due to its ultra-thin and ultra-lightweight characteristics. It should have potential applications in radar...
Mutual coupling reduction technique using novel soft surface structures has been investigated. Conventional soft surface structures are made on the ground plane of the antenna. But this new structure does not require a ground plane, it has very simple structure. It shows better mutual coupling reduction characteristic than conventional soft surface structures. This structure can be applied for surface...
This paper presents the design of a near-field reader and tag antennas in UHF that can be used for various smart shelves. The tag antenna is designed by introducing an ldquoSrdquo-shaped or ldquo+rdquo-shaped slot to the circular patch and the reader one is a rectangular slot array fed by a microstrip line. These antennas operated in UHF near-field are more reliable in many RFID applications where...
This paper presents a study of the characteristic impedance of a ridge gap waveguide. Ridge gap waveguides belongs to a new metamaterial-based waveguide technology for millimeter and submillimeter waves which emerged recently. A formula for the characteristic impedance of an ideal PEC-over-PMC ridge gap waveguide has been derived. A preliminary numerical study of the characteristic impedance of a...
This paper presents an investigation of both electromagnetic wave model and equivalent circuit model for microstrip patch antenna (MPA) with rectangular defected ground plane structure (RDGS). The objective of the proposed design is to reduce antenna size from Wi-Fi wireless band to the Bluetooth band. The first part of the paper describes the electromagnetic wave modeling using the High Frequency...
Vias can introduce impedance discontinuity, slow down signal edge rate, add jitter and reduce eye openings, and cause data misinterpretation by the receiver in high-speed channel. This paper presents the design and optimization of differential vias for high-speed serial ATA connection at the data rate of 6 Gb/s. First, differential vias on a specific stackup were modeled in the 3D full-wave solver...
In this paper an analytical approach based on generalized cavity model and segmentation method has been proposed to investigate the wideband behavior of the probe-fed, U-Slot microstrip patch antenna. Contour integration methods to improve the overall convergence of the analysis has been demonstrated. Numerical results on convergence will be presented at the time of the conference.
We present the idea of a simple frequency reconfigurable patch antenna that operates at multiband from 2 GHz to 4.5 GHz in this paper. By changing the position of the microstrip connecting elements on the antenna patches, the operating frequency will shift with fixed radiation patterns. Both simulated and measured results are provided and shown in good agreement.
The analysis of XPol suppression techniques in linear arrays reveals that, even though some particular structures can cancel these fields efficiently, the geometrical composition of the entire array affects the side lobe levels. Previous reports have proposed geometries where the Chebyshev SLL control technique is not effective. This work presents a novel geometrical approach, whose radiation pattern...
The design theory and the equivalent circuit model of an aperture-coupled vertically mounted strip antenna were presented. Related circuit element values were calculated with the help of the network analysis. Based on the developed equivalent circuit, a C-band ACVMSA was designed with the help of the hybrid GA optimization algorithm. The computed input impedance was compared to the simulation and...
In this paper, the design and operation of a compact six-port correlator operating as a QPSK modulator/demodulator in a UWB transceiver has been presented. A microstrip-slot technique has been used to obtain full integration of the correlator. The design has been accomplished with the use commercially available full-wave CAD package, CST Microwave Studio. The signal analysis at receiver and transmitter...
This paper shows the design process and measurement data for a modified bi-directional equiangular spiral antenna fed by a microstrip to parallel-strip to twin-line transition on two substrates (20-mil thickness) with three layers (aligned vertically). By etching holes out of the spiral arms at the locations where the tapered parallel-strip line passed underneath, the impedance mismatch caused by...
A polarization diversity MIMO microstrip antenna array is designed to give a solution for a WiMAX base station antenna of wideband, dual slant plusmn45deg polarization, low cross polarization, high gain and isolation. The fabricated antenna with compact structure based on the design has gains of 12.3 dBi-14.81 dBi in the whole working band, isolation of 18 dB above, cross polarization less than -13...
In this paper, investigation results of a Sierpinski microstrip fractal antenna is presented by feeding using different feed mechanisms. It has been observed that the proposed novel feed network can significantly enhance its multi-band impedance match in addition to its input gain performance. The antenna will be fabricated and experimentally verified. The measured results along with the simulation...
In this paper, the authors have obtained the transmission losses by measuring microstrip lines and post-wall waveguides of different lengths and estimated the loss per unit length. These losses have been analytically derived by different closed formulas and compared with the measured values. The effective conductivity and complex permittivity by WG mode resonator method have been quantitatively confirmed...
In this paper a new concept for the design of the ultra broadband antennas with dual-orthogonal, linear polarization is introduced. It enables an outstanding polarization decoupling over the very wide frequency range. The antenna built accordingly to this concept can be realized in the planar technology, where the radiation occurs perpendicularly to the antenna surface. This feature is not common...
A triple-band unidirectional coplanar antenna is developed for WLAN/WiMax wireless applications. The triple-band planar antenna consists of a top-loaded dipole for the 2.4-GHz band, two longer dipoles for 3.5-GHz band, and 2 shorter dipoles for the 5-GHz band. The triple-band antenna is printed on a coplanar substrate. The antenna achieves a similar directional radiation pattern at all of the three...
In this paper, a new scheme of design for omni-directional microstrip antenna (OMA) is proposed. An prototype of the antenna with 11-section is designed and fabricated for 2.3GHz~2.7GHz WiMAX CPE application. Both simulated and measured results have shown that the antenna has a good performance in gain, omni-directivity and broad bandwidth. Moreover, the designed antenna is also readily manufactured...
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