Home About us Contact
|
Home About us Contact | ||
|
|
||
Electrical Length (electrical + length)
Selected AbstractsCompact sharp cutoff wide stopband microstrip low-pass filter using complementary split ring resonatorMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2007Santanu Dwari Abstract A novel compact microstrip low-pass filter (LPF) is proposed using open circuit stubs and square patches alongwith complementary split ring resonator (CSRR). It exhibits wide stopband and sharp rejection. A demonstration LPF, having 3-dB cutoff frequency of 1.45 GHz, was fabricated and measured. Measured passband to stopband attenuation slope is more than 355 dB/GHz. Measured rejection greater than 20 dB extends over more than 13.75 times of the 3-dB cutoff frequency. Electrical length of the filter is less than 12% of the guided wavelength at 3-dB cutoff frequency. Experimental and simulated results agree well. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2865,2867, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22825 [source] Compact wide stopband low-pass filter using rectangular patch compact microstrip resonant cell and defected ground structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007Santanu Dwari Abstract A new compact microstrip low-pass filter (LPF) is presented using a novel rectangular patch compact microstrip resonant cell (RPCMRC) and square-head defected ground structure (DGS). It exhibits wide, high stopband, and sharp rejection. A demonstration LPF having 3 dB cutoff frequency of 2.65 GHz was fabricated and measured. Measured rejection is better than 20 dB from 2.8 to 16 GHz. Electrical length of the filter is less than 20% of the guided wavelength at 3 dB cutoff frequency. Measured passband to stopband attenuation slope is more than 56 dB/GHz. Good match between experimental and simulated results are obtained. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 798,800, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22259 [source] A T-type fractal boundary single-feed circularly polarized microstrip antennaINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2009P. Nageswara Rao Abstract A single-feed T-type fractal boundary microstrip antenna is presented. It is established that a very good circular polarization is realizable with 3-dB axial ratio bandwidth of 1.27% at the center frequency of 2446 MHz by changing the electrical length in two directions of the square patch by using T-type fractal curve as boundary. Further it is shown that the surface area occupied by the antenna is reduced compared to the Euclidean shaped patch antenna without much degradation in gain of the antenna. Experimental results are compared with simulated results and a very good agreement is obtained. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009. [source] Distributed MEMS transmission lines for tunable filter applicationsINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2001Yu Liu Abstract This paper describes the design and fabrication of a distributed MEMS transmission line (DMTL), used to realize a transmission-line with a voltage-variable electrical length for microwave circuits. The DMTL is a coplanar waveguide periodically loaded with continuously-variable MEMS capacitors. A tunable bandpass filter was designed and fabricated on 700 ,m thick glass substrates using three capacitively coupled DMTL sections as variable shunt resonators. The measured results demonstrate a 3.8% tuning range at 20 GHz with 3.6 dB minimum insertion loss. Issues for future improvement are discussed. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 254,260, 2001. [source] Metamaterial transmission lines with tunable phase and characteristic impedance based on complementary split ring resonatorsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2009Adolfo Vélez Abstract In this article, resonant-type tunable metamaterial transmission lines with independent control over the electrical parameters of the line, that is, the electrical length and characteristic impedance, are presented for the first time. Tuning is achieved by loading a host microstrip line with varactor-loaded complementary split ring resonators (VLCSRRs) and varactor diodes. By locating the varactor diodes in series configuration with the line, outside the region occupied by the VLCSRRs, it is possible to control the characteristic impedance and the electrical length (phase shift), over a wide band. As an illustrative example, a tunable 35 ,/90° line functional between 0.4 and 0.8 GHz (which represents more than 65% tuning range), is presented and applied to the design of a transmission line power divider. The device is small and it exhibits reasonable performance. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1966,1970, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24480 [source] Study on discontinuous microstrip periodic slow-wave structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009Jun He Abstract In this article, several discontinuous microstrip periodic slow-wave structures, which possess equal electrical length but different number of unit cells, have been designed and measured. The performance of the periodic structure improves when the number of unit cells increases. However, when the number of unit cells increases to some degree, its characteristics, including cutoff frequency, dispersion, and group delay, get better slightly because of the influence of parasitic parameters. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1455,1458, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24402 [source] Design of meander square-ring resonator and its application in RF power dividerMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009Fei Zhang Abstract First, this letter presents a novel meander square-ring resonator (MSRR) and its stop-band and slow-wave effects are investigated. Served by the proposed MSRR, unwanted higher-order 2nd and 3rd harmonics of power divider are effectively rejected benefiting from its stop-band effect without any additional filter, and the physical length of quarter-wavelength 70.7 ohm microstrip in power divider is halved utilizing its slow-wave effect without decreasing the electrical length. Finally, power divider with area reduction by 42.6% is successfully obtained, compared with conventional design. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1602,1604, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24394 [source] Fractal-shaped microstrip dual-mode bandpass filter with asymmetrical sinuous spurlinesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009Fu Tong Abstract In this article, miniaturized dual-mode bandpass filters using Koch fractal-shaped slots and sinuous spurlines are proposed. Because of the space-filling property of the fractal geometry, the transmission characteristics of this filter can be adjusted by the iteration order of the Koch fractal curve. Moreover, asymmetrical sinuous spurlines are adopted to tune the degenerate modes. Compared with the conventional square-patch filters, fractal slots and sinuous spurlines can also provide more current distribution distortions which improve the electrical length and realize a compact design. Experimental data in agreement with theoretical data verify the design methodology. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 745,747, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24167 [source] | ||||||||||