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Gap coupled Microstrip Antenna (MA) provides high bandwidth and so finds its use in various kinds of wireless communications. Optimization of microstrip patch antennas has been achieved by a technique popularly known as Particle Swarm Optimization (PSO). In this paper, PSO is used to optimize the resonant frequency of rectangular gap coupled MA. Inspection is carried out for microwave frequencies...
In the printed circuit board (PCB) of high-speed optical transceiver module, the signal transmission speed is limited by many effects. In a multilayer PCB, a through-hole via is usually used to connect the signal path between the upper-layer and lower-layer. The impedance of signal path in PCB significantly influences on the signal performance. While the impedance of through-hole via mismatches with...
In this paper, a new structure with only one (first order) bandstop is reported. A simple trapezoid shape of the microstrip line is introduced instead of the more complicated pattern. It obtains simple simulation, optimization and fabrication.
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...
This paper presents the design of microstrip couplers with improved directivity. In order to compensate for the unequal phase velocities of even- and odd-mode in inhomogeneous media, the coupler is subdivided into multiple sections. It is shown that by properly choosing the lengths, the impedances, and the coupling coefficients of the corresponding sections, the coupler's directivity can be optimized...
The theory design would exceed the practical range in the conventional wideband matching networks design. The improved MEA was adopted to optimize nonuniform broadband impedance transformer in this paper. In the paper the improved self-adaptive similartax strategy was presented at first, which self-adaptive choose the spread range of different subpopulations and control the distance of new individuals...
In this work, we present a bandwidth enhanced solution based on a different and more flexible repeater architecture which uses MEMS-reconfigurable loaded parasitics and an aperture coupling feeding mechanism. The proposed gap-filler can be smartly reconfigured in real-time to optimize its performance (matching and isolation level and bandwidth) in the presence of a changing surrounding environment.
The multiport network model (MNM) is an analytical method that is used to analyze microstrip antennas. MNM is based on defining ports along the periphery of the patch and evaluating the impedance matrix corresponding to these ports by using the Greenpsilas function for the cavity under the patch. For regular rectangular, triangular and circular patches, analytical expressions for the Greenpsilas function...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
In this paper, we present optimization of microstrip tapered baluns that used in frequency independent antennas such as sinuous and spiral antennas. In this method, tapering profile of the baluns is optimized so that to achieve better matching results for input impedance of coaxial cable to balanced antenna input impedance with a shorter length of baluns. For this purpose we've used an optimized non-linear...
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