The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this work a method for characterization of transmission line (TL) in high-frequency laminates is proposed. The method is performed in a novel PCB laminate based in PTFE for high-frequency applications with low conductor roughness (hrms) and low loss tangent (tanδ). In order to apply the characterization method, S-parameters were taken up to 30 GHz in a microstrip interconnect. Time domain simulation...
In this paper, we propose a new extraction method for the characteristic impedance and effective dielectric constant of a microstrip line. It extracts the characteristic impedance and effective dielectric constant of a microstrip line that uses the results of S-parameters through the EM-simulation. And it also extracts the characteristic impedance and effective dielectric constant of microstrip line...
A shorted patch antenna with inductive loading for size reduction is presented. To improve input matching characteristics, a small inverted L antenna is appended at the shorted side of the patch. The transmission line model of the structure is used for predicting input impedance of the antenna. A design example is carried out for the 2.4 GHz ISM band. Calculated S11 parameter is compared and agrees...
In this paper, different approaches to calculate the characteristic impedance of slotlines by finite difference time domain (FDTD) method is presented. It shows that for non-TEM mode transmission lines, different definitions of Z0 yield completely different results. Then a more rational definition of characteristic impedance of slotlines is proposed. Result is obtained and compared with other definitions.
This work is performed to investigate the effects of normal incident electromagnetic wave with arbitrary polarization angle on the electric shielding effectiveness of a rectangular metallic enclosure with aperture by using an analytical method and numerical simulation A formulation depending on the polarization angle is successfully determined using transmission line method (TLM). A single mode normal...
A typical electronic systems with long signal transmission line illuminated by an ultra-wide band (UWB) pulse generator has been presented The test shows that: interference will be induced into the ground equipment, and working signals will be distorted under such condition. An `antenna model' of the transmission line is presented The main reason of the interference induced into the system is that...
In this paper, a synthesis algorithm for cascaded lossless commensurate lines is summarized. The algorithm is based on transfer matrix factorization. Firstly the characteristic impedance of the extracted element is calculated and then after extracting the element, the reflection factor of the remaining network is calculated. This process is repeated until the termination resistance is reached. An...
Under the conditions of the various system parameters and fault types, the performance of the phase selector based on modular fault component are analyzed. Compared with the phase selector based on difference of two phase currents, this phase selector is better in terms of overall performance. However, this phase selector cannot achieve theoretical selectivity for a real fault. Furthermore, this phase...
Identification of principal contributors to voltage unbalance and hence the implementation of suitable corrective measures has become an issue of concern for some network providers. In order to comply with stipulated limits, these network service providers require the development of quantitative measures that are reliable. For simple radial networks, the identification of sources may be seen as a...
A volumetric cloak composed of cylindrical two-dimensional transmission-line networks, has been studied with numerical simulations and measurements. The broadband cloaking effect obtained with this structure is confirmed for two different metallic objects.
Power lines performance has traditionally been assessed in terms of their efficiency and reliability. The increase of the effect of voltage sags on sensitive loads may be located far away from the faulted line, claims for a new analysis of line performance. A new method to evaluate power lines performance is proposed and compared with the previous ones based on the power line reliability. The results...
Fault location (FL) is one of the most important diagnostics tasks in transmission and distribution networks. Due to long distances of the power lines, the search and repair can take a long time, while modern microprocessor technology can help automate the FL process and give a precise (up to a span) location of the fault. The fault extinction time is reduced dramatically. In this report, the basic...
By using an indirect method for determining the characteristic impedance of uniform transmission lines embedded in coaxial connectors, a novel two tier L-L de-embedding method is presented. The proposed de-embedding method is suitable for S parameters characterization of GaN HEMTs packaged transistors mounted on a symmetrical and reciprocal test fixture. In addition, the new technique does not presents...
The conjugately characteristic impedance transmission lines (CCITLs) implemented by lossless periodic transmission-line (TL) structures can exhibit active characteristic impedances (negative characteristic resistances). In this case, the magnitude of the voltage reflection coefficient is always greater than or equal to unity for passive load terminations. Due to complicated equations involved with...
The transmission characteristics of ultra-high voltage (UHV) transmission line are analyzed. The influence of harmonic order for harmonic transfer coefficient, as well as the length of the line are summarized. With the results researched, we know that the harmonic transfer coefficient is not linear changed with the increase of harmonic order and line length. As different harmonic orders, it is with...
The development of power line communication systems require detailed knowledge of the channel properties, such as transfer functions, interference scenario and channel capacity in order to choose suitable transmission methods. such a device turns out to be helpful for comparison of performance of different communication systems. In this paper, an attempt is made to study the analysis of two different...
A composite right/left-handed waveguide-type transmission line with a variable phase constant is proposed. The transmission line is composed of a cutoff waveguide and short stubs. The phase constant can be changed from -30 deg. to +30 deg. per a unit cell by moving a dielectric in the stubs and the top wall of the stubs mechanically. The phase constant changes continuously because the right-handed...
In this paper, -15 dB branch-line hybrid was realized. In the case of-15 dB coupling power, the characteristic impedances of transmission lines were 49.20 Omega and 276.689 Omega and it was discussed to realize the high characteristic impedance of 276.689 Omega using coupled transmission lines. Using the method suggested, the problem how to realize the high characteristic impedance of 90deg transmission...
In this paper an assessment of approximate formulas for calculating Carson's integral is presented. This integral is widely used when computing the self and mutual impedances of transmission lines above an imperfect earth plane. In order to provide a reliable comparison a hybrid method of numerical integration for solving Carson's integral is presented here. In addition, contour maps obtained from...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.