This paper discusses select impacts of ambient temperature variations along a transmission line on voltage attenuation and power handling capabilities. Temperature-dependent models are developed and used in simulation...
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ISBN:
(纸本)9781457710001
This paper discusses select impacts of ambient temperature variations along a transmission line on voltage attenuation and power handling capabilities. Temperature-dependent models are developed and used in simulation to study these impacts. In order to capture the non-uniformity of line parameters caused by ambient temperature gradients, these models are characterized by multiple lumped segments which are non-uniform in length and parameter values. A case study for a medium-length line and several ambient temperature scenarios is presented and underlines the sensitivity of the line performance on temperature gradients.
One bent transmission line (TL) is considered approximated as a cascade of two uniform TLs, based on the modified TLs equation, a four-port network expression is obtained for voltages and currents at the ends of the t...
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One bent transmission line (TL) is considered approximated as a cascade of two uniform TLs, based on the modified TLs equation, a four-port network expression is obtained for voltages and currents at the ends of the two different bent TLs, interferences between the two TLs with bend are simulated, results indicated that the method used in this paper is valid which may be helpful in the design of high speed PCB.
Human body transmission characteristic is investigated as nonuniform medium. The body is divided into multilayer and modeled with nonuniform transmission line. The analytical result is obtained with this simple and no...
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Human body transmission characteristic is investigated as nonuniform medium. The body is divided into multilayer and modeled with nonuniform transmission line. The analytical result is obtained with this simple and novel method. Numerical simulation is applied to validate this analytical method. The difference between them is within 0.01V/m.
In this paper, a new synthesis and design methodology is presented and applied for the fast and accurate design of inductive rectangular waveguide filters. By using this technique, the dimensions of both homogeneous a...
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In this paper, a new synthesis and design methodology is presented and applied for the fast and accurate design of inductive rectangular waveguide filters. By using this technique, the dimensions of both homogeneous and inhomogeneous filters can be successfully synthesized for almost any practical filter bandwidth, return loss, or filter order. This novel technique is based on a prototype with additional degrees of freedom, able to match the response of the different filter components in a wideband frequency range, and an elaborated design procedure that fully exploits this flexibility. During the design procedure, the prototype and the real structure are continuously aligned in order to have the same electromagnetic behavior and jointly evolve to obtain an equiripple response. Once the final prototype has been synthesized, excellent filter dimensions can be extracted that, in most cases, do not require further optimization. Examples will show the outstanding performance of the proposed design technique in terms of versatility, accuracy, and CPU time.
A new microfluidic cytometer for single-cell dielectric spectroscopy is proposed in this paper and analyzed in silico by means of a finite-element model. The device, inspired by electrical impedance tomography, includ...
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A new microfluidic cytometer for single-cell dielectric spectroscopy is proposed in this paper and analyzed in silico by means of a finite-element model. The device, inspired by electrical impedance tomography, includes two circumferential arrays of electrodes instead of just two pairs of coplanar or parallel-facing electrodes, thus allowing a great versatility in stimulation and measurement patterns. In particular, using stimulation patterns with different spatial orientation provides information on cell morphology, besides quantitative cell-volume estimation. Moreover, the performance limitation at low frequency due to electrode polarization is overcome, owing to a peculiar recording scheme: Current is injected between an electrode pair, and the resulting voltages are measured at remaining electrodes using high-input-impedance differential amplifiers. These features significantly enhance the cytometer discrimination capabilities.
This article presents a method for the inclusion of the zero-sequence mutual impedance in a distributedparameter model of transmission lines. An analytical deduction of the line constants was developed for the single...
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This article presents a method for the inclusion of the zero-sequence mutual impedance in a distributedparameter model of transmission lines. An analytical deduction of the line constants was developed for the single-phase case of magnetically coupled circuits, and these constants were used in the line model with symmetrical components. The method was tested with the measurements from fault records. First, the phasors are computed from the recorded waveforms, and then the sequence components are calculated. The record from one line end is used to compute the theoretical values of the remote line end, and these computed values are compared with the record of the remote line end. The results without the effect of the zero-sequence mutual impedance are also computed in order to show the differences.
In this letter, a distributed model for Ethernet transformers subject to common mode signals is developed. Explicit formulas for transfer functions are derived and illustrated by numerical examples.
In this letter, a distributed model for Ethernet transformers subject to common mode signals is developed. Explicit formulas for transfer functions are derived and illustrated by numerical examples.
A 77 GHz low noise amplifier has been designed using common source topology implemented in low cost CMOS technology for various applications. A new method has been proposed for the design of the amplifier. In this met...
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ISBN:
(纸本)9781424467600
A 77 GHz low noise amplifier has been designed using common source topology implemented in low cost CMOS technology for various applications. A new method has been proposed for the design of the amplifier. In this method, input/output matching networks and transistor gate widths have been optimized for maximum gain and minimum noise figure. The design is flexible such that the LNA can operate in both high gain/high power and low gain/low power modes with low noise figure of less than 7 dB at 77 GHz. Amplifier gain is better than 18 dB consuming 60 mW of dc power and it is better than 14.5 dB consuming 30 mW of dc power. The input and output return losses are better than 10 dB in the frequency range of 72 to 82 GHz.
We propose a tunable multiband antenna using four epsilon negative zeroth order resonators (ENG ZORs). Each ENG ZOR unit cell consists of two shunt inductors for the epsilon negative property, a transmission line for ...
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We propose a tunable multiband antenna using four epsilon negative zeroth order resonators (ENG ZORs). Each ENG ZOR unit cell consists of two shunt inductors for the epsilon negative property, a transmission line for the right handed property, and a variable capacitor for wide frequency tuning range. ENG ZORs #1 and #2 are placed on the same ground plane and operated at Tx band (f 1 ) and Rx band (f 2 ) of lower band, respectively. In contrast, ENG ZORs #3 and #4 are constructed perpendicular to the ground plane and have the resonance frequencies at Tx band (f 3 ) and Rx band (f 4 ) of higher band, respectively. The resonant frequencies of the designed antenna can be tuned from 740 MHz to 940 MHz at lower band and from 1.545 GHz to 2.05 GHz at higher band. The designed antenna has the very compact size of 50 mm × 5 mm × 5 mm.
In this paper, a quad-band inverse class-F power amplifier using the novel composite right/left-handed (CRLH) transmission lines (TLs) is developing covering 700 MHz, 800 MHz, 1800 MHz, and 2140 MHz. The novel CRLH TL...
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In this paper, a quad-band inverse class-F power amplifier using the novel composite right/left-handed (CRLH) transmission lines (TLs) is developing covering 700 MHz, 800 MHz, 1800 MHz, and 2140 MHz. The novel CRLH TL metamaterials with two left-handed (LH) (backward) and two right-handed (RH) (forward) pass bands are used for quad-band operation. The second- and third-harmonics for four bands are located on open and short impedances for high-efficiency inverse class-F power amplifier. With the inverse class-F output matching network based on the quad-band harmonic control circuits, the measured maximum power-added efficiency (PAE) of the proposed quad-band inverse class-F power amplifier is 58.2 %, 50.3 %, 48.6 %, and 56.6 % for an output power of 41.5 dBm, 39.7 dBm, 37.7 dBm, and 40.7 dBm at 700 MHz, 800 MHz, 1800 MHz, and 2140 MHz, respectively.
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