A 119 GHz Bandwidth Distributed Amplifier with a ±2 ps Group Delay Variation

This work presents the design for an antenna element that can be used in radio arrays for the monitoring and detecting of radio emissions from cosmic particles’ interactions in the atmosphere. For these applications, the pattern stability over frequency is the primary design goal. The proposed antenna has a high gain over a relative bandwidth of 88%, a beamwidth of 2.13 steradians, a small group delay variation and a very stable radiation pattern across the frequency bandwidth of 110 to 190 MHz. It is dual polarized and has a simple mechanical structure which is easy and inexpensive to manufacture. The measurements show that the ground has insignificant impact on the overall radiation pattern.

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High Q series negative capacitor using negative group delay circuit based on a stepped-impedance distributed amplifier

IEICE Electronics Express ◽

10.1587/elex.14.20170088 ◽

2017 ◽

Vol 14 (7) ◽

pp. 20170088-20170088 ◽

Cited By ~ 7

Author(s):

Tiedi Zhang ◽

Chung-Tse Michael Wu ◽

Ruimin Xu

Keyword(s):

Group Delay ◽

Negative Group ◽

Delay Circuit ◽

High Q ◽

Distributed Amplifier ◽

Negative Group Delay

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CPW-Fed 8-Shaped Monopole Antenna for Ultra Wideband Applications

Frequenz ◽

10.1515/freq-2016-0025 ◽

2016 ◽

Vol 70 (11-12) ◽

Author(s):

Sarthak Singhal ◽

Amit Kumar Singh

Keyword(s):

Group Delay ◽

Coplanar Waveguide ◽

Monopole Antenna ◽

Ultra Wideband ◽

Impedance Bandwidth ◽

Radiation Patterns ◽

Antenna Structure ◽

Operating Frequency Range ◽

Good Agreement ◽

Delay Variation

AbstractA CPW-fed 8-shaped monopole antenna for ultra wideband applications is presented. It consists of a 8-shaped monopole and two quarter elliptical coplanar waveguide ground planes. An impedance bandwidth from 5.4 GHz to 23.83 GHz is achieved. The radiation patterns are observed to be omnidirectional and bidirectional in E-and H-plane respectively at lower resonances. At higher frequencies, the radiation patterns are found to be nearly omnidirectional in both planes. The group delay variation is also observed to be constant in the operating frequency range. A good agreement is found between the simulation and experimental results. The designed antenna structure has miniaturized dimensions and wider bandwidth as compared to other already reported monopole structures.

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Digital All-Pass Filter Modeling Based on Desired Group Delay Using Advanced Material: A Review on the Signal Processing Part

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.815.338 ◽

2015 ◽

Vol 815 ◽

pp. 338-342

Author(s):

Faizah Abu Bakar ◽

Sohiful Anuar Zainol Murad ◽

Rizalafande Che Ismail ◽

Muzamir Isa

Keyword(s):

Transfer Function ◽

Group Delay ◽

Sampling Frequency ◽

Bilinear Transformation ◽

Pass Filter ◽

Low Pass Filter ◽

Phase Type ◽

Low Pass ◽

Group Delays ◽

Delay Variation

This paper presents a review on three types of techniques in designing digital all-pass filters based on group delay. All the three methods use the same basic concept rooting back to the requirement of a stable transfer function of the filter which should be a minimum-phase type, and the denominator group delay. The most optimized of the three is chosen to be implemented in MATLAB in order to decrease the group delay variation of a 5th order Chebyshev low-pass filter with cut-off frequency of 160 MHz. The digital transfer function of the low-pass filter is obtained from the analog transfer function by means of bilinear transformation. The sampling frequency of the digital LPF is 100 times the cut-off ffrequency to retain the response of the analog LPF. Both of the filters are then cascaded together and the overall group delays variations are analyzed. The variations of group delay shows a reduction but the price paid is the increase of the overall group delay of the system.

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