			Home About us Contact

Microstrip Structures (microstrip + structure)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

An optimum superconducting ultra-wideband bandpass filter at VHF band

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
Wei Chen
Abstract A highly selective superconducting ultra-wideband filter with a passband from 125 to 260 MHz is designed and demonstrated using a microstrip structure. The filter is designed according to a circuit model for an optimum short-circuited stub transmission-line filter and consists of 10 shunt short-circuited stubs separated by connecting lines. The short-circuited stubs are quarter-wavelength long, and the connecting lines are half-wavelength long. The filter is realized on two 3-inch YBCO/LaAlO3 substrates, which are connected by two bonding wires. The short-circuited stubs are grounded via two grounding pads that are attached to the box wall by a number of SiAl bonding wires. The measured results exhibit a selective filtering characteristic equivalent to a 19-pole Chebyshev filter and a low insertion loss of less than 0.1 dB at center frequency without tuning. Furthermore, the experimental results of the filter are in good agreement with the simulated ones. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2639,2641, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25571 [source]

Fast and accurate calculation of transmission coefficients for an EBG microstrip structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
Shao Ying Huang
Abstract In this article, an approach is proposed to provide an accurate and fast calculation on the transmission coefficients of an electromagnetic band-gap (EBG) structures where patches are periodically inserted into the microstrip line (capacitive loaded EBG microstrip structure). The stopband performance, such as the center frequency, bandwidth, and attenuation, of these EBG structures can be predicted at a high degree of accuracy through the calculation of the transmission coefficient. The dispersion relation of electromagnetic waves in the structure is derived, plotted, and analyzed. The grating nature of the structure is demonstrated. This approach can be applied to periodic microstrip structures of a similar nature to simplify the analysis and design procedures. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:793,797, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25046 [source]

Size reduction of microwave and millimeter-wave passive circuits by UC-PBG in standard 0.18-,m CMOS technology

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2008
Shuiyang Lin
Abstract Size reduction of microwave and millimeter-wave (mm-wave) passive circuits incorporating a defective uniplanar compact photonic bandgap (UC-PBG) slow-wave structure is investigated. Benefited from the multilayer mental technology of the standard 0.18-,m CMOS process, thin film microstrip structure is properly constructed on the lossy silicon substrate to reduce substrate loss. Defected periodic patterns on the ground plane are used to contribute to an enhancement of the effective dielectric constant and the slow-wave factor is 14% increased by the use of UC-PBG ground. Microwave and mm-wave passive circuits including resonator and filter are designed and fabricated. Measured results show that the use of UC-PBG ground has induced a frequency drop of 14% and validate the size reduction concept by using UC-PBG. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2251,2254, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23643 [source]

Design of novel microstrip low-pass filter using defected ground structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
Petr Vágner
Abstract A novel microstrip low-pass filter utilizing defected ground structure (DGS) units is presented in this article. A DGS unit is simulated with different physical dimensions in order to show variation of attenuation pole and cut-off frequency. Next, a low-pass filter using proposed DGS unit is designed. A method for determining dimensions of microstrip structure and DGS units is proposed. Influence of dimensions of the microstrip structure on filter characteristics is investigated and simulated. Filters of various orders are simulated as well. Selected filter is simulated and experimentally verified. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 10,13, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22982 [source]

Quasi-static analysis of microstrip lines with variation of substrate thickness in transverse direction

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2003
S. Khoulji
Abstract This article is devoted to the analysis of microstrip lines printed on dielectric substrates with transversely varying thickness using the quasi-static approximation and the method of lines. Discretization lines of varying length, according to the layer thickness, are used and only the Laplace wave equation has to be solved. The numerical results presented herein permit the illustration of the effect of arbitrarily curved substrate interfaces along the transverse direction on the characteristics of the microstrip structures under consideration. The behavior of the per unit length parameters of these structures as a function of the shape of these substrates' cross section is studied in depth. Furthermore, the effects of the finite metallization thickness and losses are also investigated in detail. The results that are obtained are consistent with those published in the literature. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 194,205, 2003. [source]

Fast and accurate calculation of transmission coefficients for an EBG microstrip structure

Harmonic suppressed and size-reduced bandstop and bandpass filters

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009
Majeed A. S. Alkanhal
Abstract New bandstop/bandpass microstrip structures with harmonic suppression are presented in this article. By replacing the series quarter-wavelength connecting lines of conventional open-stub bandpass/bandstop filters with the equivalent ,-shaped line section, compact open-stub bandstop/bandpass filters with second harmonic suppression are achieved. Transmission-line theory is used to derive the design equations of the equivalent ,-shaped lines. Simulation and experiments have also been done to validate the proposed design concept. When compared with the conventional open-stub Bandpass/Bandstop filters, the second harmonic is suppressed and size reduction is achieved in both the Bandstop/bandpass structures. Moreover, results confirm that the proposed shaped bandpass filter achieves a further third harmonic rejection. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2109,2114, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24580 [source]

Comparison between different models for the thin metallic substrate in multilayer microstrip structures

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2006
Lu Zhang
Abstract The dispersive characteristics of multilayer microstrip structures with one thin metallic substrate are studied using the spectral-domain approach. The numerical results of several approximate models are compared with that of the immittance approach as one exact model. The comparison shows that the widely used resistive sheet (R-card) model is not appropriate to handle such structures over a broad frequency range. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1113,1117, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21556 [source]

Studies on crossover and broadside-coupled microstrip bandstop filters

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2003
Ning Yang
Abstract Two kinds of two-layer microstrip structures, including crossover and broadside-coupled microstrip lines, and their equivalent circuits, are studied based on a quasi-static analyzing method. The shorting vias from the bottom strips to the ground planes are introduced to achieve bandstop. Simulated and measured results show the validity of the proposed structures and their CAD models for the design of bandstop filters. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 228,231, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11022 [source]

Loss inclusion via dyadic Green's function modifications for microstrip structures with complex media: Interfacial exponential field behavior within conductor ,

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2001
Clifford M. Krowne
Abstract 2-D field behavior within a metal strip is used to correct the dyadic Green's function for a microstrip structure containing complex-layered media so that the attenuation constant can be determined. In the x -direction, the field is built to display exponential dependence. The strip width is explicitly taken into account, along with the metal thickness and conductivity. New Green's function expressions of the structure are found consistent with a full-wave electromagnetic code employing zero thickness extent conductors for the guiding metal. Implications for numerical implementation are covered. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 54,60, 2001. [source]