In this paper a new procedure for designing forward-wave directional couplers using periodic shunt short circuited stubs is proposed. A new type of cell using these stubs, which enlarge the phase difference between even- and odd modes of a uniform microstrip coupled line is introduced. Using the equivalent circuit model for even- and odd-modes of the proposed cell, the elements of the  ABCD tra...

Printable TDR-based chipless tags can be found either as. Planar circuit chipless RFID tags are designed using standard planar. October, 2002, Available:http:www.rfsaw.compdfsGlobalSAWIDTaglg.pdf. Das.Conventional integrated circuit IC chip based RFID tags, however. Fortunately, printable chipless RFID tags, combining the use of high throughput printing.rectifier circuit is proposed in this pap...

Global Positioning System (GPS), is a space-based radio navigation system, consisting of 24 satellites and ground support. GPS provides users with accurate information about their position and velocity, as well as the time, anywhere in the world and in all weather conditions. GPS was initiated in 1973. It is now the heart of modern day navigation systems. GPS became attractive to a broad spectr...

A modified particle swarm optimization (PSO) algorithm applied to planar array synthesis considering complex weights and directive element patterns is presented in this paper. The modern heuristic classical PSO scheme with asynchronous updates of the swarm and a global topology has been modified by introducing tournament selection, one of the most effective selection strategies performing in ge...

Design and fabrication aspects of an affordable planar beam steerable antenna array with a simple architecture are considered in this paper. Grouping the elements of a phased array into a number of partially overlapped subarrays and using a single phase shifter for each subarray, generally results in a considerable reduction in array size and manufacturing costs. However, overlapped subarrays r...

This paper suggests a slotted ground ‘S’-shaped low profile planar microstrip patch antenna for wideband and high gain operation. The suggested has physical dimensions of 20mm×14mm×1.6mm having fractional bandwidth 111% the operating impedance 22.55GHz (9.12 GHz to 31.67 GHz). At 19 GHz, maximum 3.9 dBi is attained. An equivalent circuit model corresponding designed by ADS software assessed wit...

A spectral-domain volume-integral-equation method is developed for analyzing superconducting planar transmission lines. This method rigorously accounts for the complex conductivity, the finite metallization thickness, and the anisotropy of superconductors. Calculated effective dielectric constants and quality factors for microstrip lines and coplanar waveguides show good agreement with measured...

Filters play an irreplaceable role in virtually any type of radio frequency (RF)/microwave system today. With the recent rapid development and widespread use of various wireless communication systems, ever-more stringent requirements are posed on RF/ microwave filters – smaller size, higher performance, and lower cost are all simultaneously required today. Even more recently, multi-band operati...

— In this paper, a novel notch resonator is proposed based on Rectangular Split Ring Resonator (R-RSS) element. We represented the electrical characteristics for R-SRR elements coupled with microstrip line, and measured result is compared with electromagnetic simulation (HFSS) result. We also solved equivalent circuit for R-SRR element, and also discussed influences of change structural paramet...

An approach to design of chaotic oscillators with controlled bandwidth in different frequency bands is proposed. One of possible mathematical models of the oscillator and simulation results are considered. Implementations of microwave chaotic oscillators and experimental results are demonstrated. Index terms – Dynamic chaos, chaotic oscillator, frequency-selective circuit, microstrip line, wide...