Broadband property and time-domain application of general transmission-line equations on microstrip low-pass filter

2002 ◽  
Vol 33 (2) ◽  
pp. 123-126 ◽  
Author(s):  
Xiaolong Zhong ◽  
Yaowu Liu ◽  
Kenneth K. Mei
Keyword(s):  
Transmission Line ◽  
Time Domain ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

A microstrip planar lowpass filter with ultra-wide stopband using hexagonal-shaped resonators

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shu Jiang ◽  
Wenbo Wang ◽  
Le Ren
Keyword(s):  
Transmission Line ◽  
Harmonic Suppression ◽  
Lowpass Filter ◽  
Functional Area ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Impedance ◽  
Low Pass ◽  
Multiple Transmission

Abstract A microstrip planar lowpass filter with ultra-wide stopband up to 40 GHz is presented. The filter is designed based on four types of hexagonal-shaped resonators, producing multiple transmission zeroes and extending the stopband. The high-impedance transmission line is folded to make the circuit more compact and form the coupling gaps between the adjacent resonators. A pair of folded open stubs are added to enhance the cut-off rate. As a result, an ultra-wide stopband with 23rd-harmonic suppression has been attained. A demonstration filter has been designed and fabricated with 3 dB cut-off frequency of 1.70 GHz. The measured results show that the relative stop bandwidth of the low-pass filter (LPF) is 182% with suppression level of 25 dB, covering 1.85–40 GHz. The functional area size of the filter is 21.50 × 21.70 mm, which corresponds to 0.198λ g  × 0.200λ g (λ g is the guided wavelength at 3 dB cut-off frequency).

scholarly journals Design of Reconfigurable Bandwidth Filtering Antenna and Its Applications in IR/UWB System

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 163
Author(s):  
Zhuohang Zhang ◽  
Zhongming Pan
Keyword(s):  
System Design ◽  
Time Domain ◽  
Low Cost ◽  
Impulse Radio ◽  
Dynamic Adjustment ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Compact Size ◽  
Low Pass ◽  
Communication Frequency

A reconfigurable bandwidth antenna for an impulse radio-UWB (IR/UWB) system design is illustrated in this paper. By adopting a continuously tunable low-pass filter by varactor at the feed of the antenna, the proposed antenna obtains a continuous tunable bandwidth from 1.02 GHz to 2.42 GHz. To ensure the identifiability of transmitted pulses in (IR-UWB) system, the antenna is analyzed in both frequency domain and time domain. The proposed antenna is valid with a system fidelity factor (SFF) above 0.8 while the bandwidth is tuning. The compact size, low cost, and tunable bandwidth with the identifiability of the transmitted pulse makes it suitable for UWB impulse radars to improve the utility ratio of frequency, and dynamic adjustment avoids interference of the IR-UWB in other communication frequency bands.

scholarly journals Generalized Chebyshev-like Approximation for Low-pass Filter

2011 ◽  
Vol 7 (1) ◽  
pp. 5-8
Author(s):  
Hisham Swady
Keyword(s):  
Time Domain ◽  
Analog Circuits ◽  
Analog Filters ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Novel Approach ◽  
Odd Order ◽  
Low Pass ◽  
Time Domain Response ◽  
Chebyshev Filter

Analog filters constitute indispensible component of analog circuits and still playing an important part in interface with analog real world. realizing filters with odd order is preferred because of its time response . Therefore, this paper is conducted to introduce a new generalized Chebyshev – like approximation for analog filters. The analyses presented to realize the filters with odd order. This proposed novel approach offer good results in terms of flat delay and time domain response. Also, the achieved results are validated by comparison to normal Chebyshev filter via investigation several examples.

A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells

2016 ◽  
Vol 9 (5) ◽  
pp. 1023-1027 ◽  
Author(s):  
Saeed Roshani
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Stop Band ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Impedance ◽  
Attenuation Level ◽  
Low Pass ◽  
High Rejection ◽  
Good Agreement

In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the −20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is only 0.1 λg × 0.19 λg, which shows excellent size reduction. There is a good agreement between the simulated and measured results.

scholarly journals Degradation Trend Estimation and Prognosis of Large Low Speed Slewing Bearing Lifetime

2014 ◽  
Vol 493 ◽  
pp. 343-348 ◽  
Author(s):  
Bu Yung Kosasih ◽  
Wahyu Caesarendra ◽  
Kiet Tieu ◽  
Achmad Widodo ◽  
Craig A.S. Moodie ◽  
...  
Keyword(s):  
Time Domain ◽  
Moving Average ◽  
Low Frequency ◽  
Vibration Signal ◽  
Accurate Information ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Speed ◽  
Slewing Bearing ◽  
Low Pass

In many applications, degradation of bearing conditions is usually monitored by changes in time-domain features. However, in low speed (< 10 rpm) slewing bearing, these changes are not easily detected because of the low energy and low frequency of the vibration. To overcome this problem, a combined low pass filter (LPF) and adaptive line enhancer (ALE) signal pre-conditioning method is used. Time-domain features such as root mean square (RMS), skewness and kurtosis are extracted from the output signal of the combined LPF and ALE method. The extracted features show accurate information about the incipient of fault as compared to extracted features from the original vibration signal. This information then triggers the prognostic algorithm to predict the remaining lifetime of the bearing. The algorithm used to determine the trend of the non-stationary data is auto-regressive integrated moving average (ARIMA).

Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 221-226 ◽  
Author(s):  
Jia-Jia Wu ◽  
Lin Li
Keyword(s):  
Transmission Line ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Interdigital Capacitor ◽  
Transmission Zeros ◽  
High Impedance ◽  
Compact Size ◽  
Low Pass ◽  
Hairpin Resonator

AbstractIn this paper, a compact low-pass filter (LPF) with wide stopband is proposed based on interdigital capacitor loaded hairpin resonator. The structure composed of an upper high-impedance transmission line, a middle interdigital capacitor, and a pair of inter-coupled symmetrical stepped-impedance stubs. Detailed investigation into this structure based on even-odd mode approach reveals that up to four transmission zeros can be generated and reallocated by choosing the proper circuit parameters. And owing to the aid of transmission zeros, the fabricated quasi-elliptic LPFs experimentally demonstrate a wide 20dB stopband from 1.4fcto 5.1fcusing a compact size of only 0.005 λg2.

The Fabrication of the Low Loss Transmission Line and Low Pass Filter using Surface Microelectromechanical Systems Technology

2004 ◽  
Vol 43 (5A) ◽  
pp. 2786-2790 ◽  
Author(s):  
Han-Shin Lee ◽  
Dong-Hoon Shin ◽  
Sung-Chan Kim ◽  
Byeong-Ok Lim ◽  
Tae-Jong Baek ◽  
...  
Keyword(s):  
Transmission Line ◽  
Microelectromechanical Systems ◽  
Low Loss ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
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