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The use of relays to improve the performance of wireless systems finds some limitations, which in the case of Amplify and Forward repeaters come from the need to decouple the incoming signal from its outgoing amplified version. In this paper we analyze the performance of Amplify and Forward relays for a partial overlap between the input and output frequency contents. By considering the relay as a...
Terahertz detectors for astronomical observations such as continuum radiation are required to have a well-defined bandpass, which is typically about 10% of the detector's center frequency. Two cavity bandpass filters with quasi-elliptic response at 220 GHz are therefore analyzed in this paper. A dual-mode cavity bandpass filter is firstly analyzed, showing a limited relative bandwidth of 5.7%. To...
There is great necessity to allocate/combine the power of signal in the present 340GHz microwave system. Therefore, this paper designed a 340GHz directional coupler with branch waveguide structure. A five-branch waveguide structure was designed in this paper considering relative bandwidth and the size of the structure. After simulating and analyzing the model of coupling structure by finite element...
A two-layer hemispherical DRA coupled to the circular waveguide through an annular slot is proposed. The configuration is easy to realize and avoids the need of additional coupling or matching elements to couple to the DRA. Good return loss characteristics with enhanced bandwidth is obtained. In addition, stable radiation pattern with low cross-pol is obtained in the impedance bandwidth.
In this paper, we investigate the feasibility of substantial bandwidth enhancement of a low-frequency miniaturized antenna on a robotic flyer through magnetic coupling with similar elements in a tight flight formation. The dimensions of a single radiating element are confined to within λ/10 × λ/10 × λ/10 for operation at around 300 MHz. Variations of end-loaded meandered line dipoles are studied and...
In this paper, we investigate the impact of linear mode coupling on the efficiency of intermodal four-wave mixing and on the group delay statistics in few-mode fibres. The investigation will include not only the weak or strong linear coupling regimes, but also the transition region between them, the intermediate coupling regime. This analysis will allow to assess the level of coupling strength require...
Apache Hadoop is the famous open source cloud computing software in recent years, the performance is much better than before due to lots of researchers' efforts, but its performance still has chance to be improved further because of unsatisfied distributed computing speed and slow response time from heterogeneous Internet's uncertain and dynamic environment. In this paper, coupling emerging GPU computing...
This paper presents a new method to calculate slot conductance which takes mutual coupling between the adjacent elements in an array into account. This method is explained for calculating slot conductances of inclined slots in the narrow wall of a rectangular waveguide. Then a slot array with this type of radiating elements is designed for −35 dB side lobe level. The results show that proposed method...
This paper presents the design of wideband millimeter-wave bandpass filter based on Substrate Integrated Waveguide technology. The filter is constructed by etching rectangular slots on the top metallic plane of SIW cavity. An effective lossy circuit model at mm-Wave frequencies is proposed with accurate parameters which have been extracted from full-wave electromagnetic simulations for the proposed...
Analysis of ring modulator helps to gain a better perception of modulator operation. There are extracted equations for transmission and modulation depth. These equations are based on loss, index and coupling modulation. Since the size of optoelectronic circuits is concern in nowadays industry, by using these extracted equations the effects of changes in ring radius on bandwidth is studied. In this...
This paper presents a study of wideband backward-wave directional coupler. In designing the proposed coupler, neural network technique is employed for optimization procedure. Composite Right Left Handed (CRLH) behavior of the coupler in conjunction with applied Defected Ground Structure (DGS) and also, connections between the coupled lines, leads to obtain high coupling coefficient in a wide bandwidth...
The Ω preprocessing was introduced to improve phase noise rejection by using a least square algorithm. The associated variance is the PVAR which is more efficient than MVAR to separate the different noise types. However, unlike AVAR and MVAR, the decimation of PVAR estimates for multi-τ analysis is not possible if each counter measurement is a single scalar. This paper gives a decimation rule based...
We demonstrate that the use of thick AlN films in Very-High-Frequency (VHF) contour-mode resonators (CMRs) enables a reduction of thermoelastic damping (TED) occurring in the metallic layers sandwiching the AlN film. This technique leads to a large improvement of the device quality factor (Q increase >72%) with respect to thin-film counterparts, resulting into the highest Q ever measured in air...
In this paper, a bump-less high-speed through silicon via (TSV) channel is proposed for terabyte/s bandwidth 2.5D IC. The signal integrity of the proposed channel is analyzed based on the frequency and time domain simulation. To analyze the signal integrity of the proposed channel minutely, the proposed channel and the conventional channel are simulated and compared respectively. Moreover, unlike...
An approach for a low-power chip-scale package is described, that provides a laser output with a programmable frequency across 50 nm of bandwidth centered at 1550 nm, and a resolution of one part in 1014.
In this paper, a compact bandpass filter with an ultra-wide upper stopband is proposed using novel slow-wave resonators, which consist of one conventional and one tapered coplanar-waveguide (CPW) sections with two identical loaded short-stubs. Such resonator can not only introduce the adjustable fundamental resonance f0, but also shift the spurious to higher frequency bands. Then, based on the proposed...
An ultra-wideband (UWB) Tightly Coupled Dipole Array (TCDA) composed of a horizontal inter-digital electric dipole and two WAIM layers is designed. The antenna is excited by a pair of 50Ω coaxial lines feed. A prototype was simulated. Results show that a bandwidth more than 5.7:1, with VSWR ≤ 3 from 2.4GHz to 13.6GHz, was achieved. The angle of scanning ranges up to 55° in E-plane while 50° in H-plane.
Near Field Communication (NFC) readers, ubiquitously embedded in smart-phones, buses and other infrastructures, are able to wirelessly deliver mW-level power to ultra-low power, passive NFC tags via a coupled magnetic field. Additionally, an NFC reader can leverage the coupled communication channel to support relatively heavy computational applications, such as sensing, visual displays, etc. Consequently,...
The article considers design features of the main modifications of analog interface for sensor systems, implemented on the base of differential difference op amps (DDA). Unlike classical structures of instrumentation amplifiers (IA) with junction coupling of stages, the suggested circuit solutions give small suppression of offset voltage (≤30 μV) and provide common-mode rejection more than −97dB in...
A novel coupled-line (CL) matched negative group delay (NGD) circuit is proposed in this paper. By loading two grounded resistors in coupling and isolation ports of CL, the presented circuit could be designed to realize the allpass bandwidth and NGD characteristic. In addition, the NGD circuit is capable of achieving input-to-output impedance transformation. To verify our proposed design, a typical...
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