Line Structures (line + structure)

Distribution by Scientific Domains


Selected Abstracts


Ultra-wideband bandpass filter using simplified left-handed transmission line structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008
Wenjia Han
Abstract A novel ultra-wideband bandpass filter has been proposed based on a simplified left-handed transmission line (LH-TL) structure. The main design procedure is to define and realize the LH-TL unit cell according to the desired pass band. The filter has been realized in theory, verified by both full-wave electromagnetic simulation and microwave circuit simulation, and confirmed by the measurement with a return loss higher than 12 dB, and the group delay about 0.25 ns over the central band with variation of 0.2 ns. 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2758,2762, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23789 [source]


Measurement of a reciprocal four-port transmission line structure using the 16-term error model

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2007
Yun Zhang
Abstract A new method to measure reciprocal four-port structures, using a 16-term error model, is presented. The measurement is based on 5 two-port calibration standards connected to two of the ports, while the network analyzer is connected to the two remaining ports. Least-squares-fit data reduction techniques are used to lower error sensitivity. The effect of connectors is deembedded using closed-form equations. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1511,1515, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22498 [source]


Compact microstrip lowpass filter using a meander-line structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2006
Guang Yi Su
Abstract A novel compact microstrip lowpass filter using N- turn meander line structure is proposed. This low pass filter provides a transmission zero near the passband edge and low passband insertion loss. Both the cutoff frequency and transmission zero can be easily controlled by changing the meander line dimensions to ease the filter design. 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1339,1341, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21619 [source]


Composite right/left handed artificial transmission line structures in CMOS for controlled insertion phase at 30 GHz

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2009
Symon K. Podilchak
Abstract Two CMOS integrated circuits are presented that utilize metamaterial composite right/left handed (CRLH) transmission lines (TLs) for zero insertion phase at 30 GHz. Specifically, 2 and 3 unit cell structures are presented with controlled insertion phase that is achieved by cascading lumped element capacitors and spiral inductors in an LC network configuration defining the TL unit cells. Furthermore, the fixed TL structures suggest the possibility of zero, advanced or delayed insertion phases by element variation, or by the use of simple active components. Simulation and measured results are in good agreement with CRLH TL theory, and display a linear insertion phase and flat group delay values that are dependent on the number of unit cells with an insertion loss of ,0.8 dB per cell. These findings suggest that such high speed CRLH TLs structures can be implemented for linear array feeding networks and compact antenna designs in CMOS at millimeter wave frequencies. 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009. [source]


Anfis models for the quasistatic analysis of coplanar strip line structures

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2010
Mustafa Turkmen
Abstract In this work, computer-aided design models based on adaptive-network-based fuzzy inference system (ANFIS) for the quasistatic analysis of three different coplanar strip line structures are presented. These strip line structures are conventional coplanar strip lines, asymmetrical coplanar strip lines with infinitely wide strip, and asymmetrical coplanar strip lines with infinitely thick dielectric substrate. The design parameters of the proposed ANFIS models are optimally determined by using four different optimization algorithms, hybrid learning, simulated annealing, least-squares, and genetic algorithm. When the performances of ANFIS models are compared with each other, the best results for training and test are obtained from the models trained with hybrid learning algorithm. There is a good agreement among the results of ANFIS models, quasistatic analysis, a full-wave electromagnetic simulator IE3D, and experimental works realized in this study. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1990,1996, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25372 [source]


A novel parallel-coupled line diplexer excited using slot-line resonators for ultra-wideband communications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009
Hon Kuan
Abstract In this letter, a novel design of microstrip diplexer used for ultra-wideband communication has been proposed. The primary structure of the diplexer comprises two different parallel-coupled line structures with slot-line resonators (SLRs), which are used for generating the filtering response with high-channel selectivity. The diplexer is designed to have the lower and higher passband with the operating frequencies at 3.2,4.8 GHz and 6.5,9.8 GHz, respectively. Experimental results also show a good agreement with the simulated results. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1552,1555, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24356 [source]