New coaxial low-pass filters with ultra-wide and spurious free stopband

2021 ◽  
pp. 1-11
Author(s):  
Rousslan Goulouev ◽  
Colin McLaren ◽  
Marta Padilla Pardo
Keyword(s):  
Communication Systems ◽  
Design Method ◽  
Characteristic Impedance ◽  
Low Frequency ◽  
Transverse Magnetic ◽  
High Peak Power ◽  
Low Pass ◽  
Transverse Electromagnetic ◽  
Mode Tem ◽  
Low Pass Filters

Abstract Modern space communication systems often need high-power low-frequency (UHF, L-, S-, and C-band) low-pass filters (LPFs) with wide stopbands extending to Ka-band and beyond. Current design approaches frequently fail to meet these requirements completely. This paper proposes a new coaxial LPF concept and design methodology. The LPF consists of an array of cavity elements, which operate with transverse electromagnetic mode (TEM) and transverse magnetic (TM)-coupled resonances, and thus achieve a frequency response with a reflection zero at DC and transmission zeroes at targeted stopband locations. The design method is based on positioning the cavities in a quasi-periodic order, which efficiently spreads the transmission zeroes over the stopband, while keeping the characteristic impedance matched to the input/output interfaces over the passband. This design concept yields an ultra-wide, continuous and modal spurious-free stopband, while maintaining a low insertion loss, high peak power capacity, and low sensitivity to production tolerances.

Low-frequency compensation of FDNR low-pass filters

1972 ◽  
Vol 60 (4) ◽  
pp. 444-445 ◽  
Author(s):  
L.T. Bruton ◽  
R.T. Pederson ◽  
D.H. Treleaven
Keyword(s):  
Low Frequency ◽  
Frequency Compensation ◽  
Low Pass ◽  
Low Pass Filters

scholarly journals Modelling of Butter worth low pass Stepped Impedance Microstrip line Filter

2020 ◽  
Vol 8 (5) ◽  
pp. 1225-1229
Keyword(s):  
Communication Systems ◽  
Return Loss ◽  
Satellite Communication ◽  
Microwave Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Microwave Application ◽  
Low Pass ◽  
Radar Satellite ◽  
Low Pass Filters

This paper presents the design of a class of highly selective micro strip low pass filters. The proposed structure is considered for Stepped Impedance Low Pass Butterworth filter of order n=3 and n=5 with cut-off frequency 1.2 GHz and passband ripple of 3.01db [1]. The substrate FR4 having a dielectric constant 4.4 is considered for calculating the physical length of the micro strip low pass filter. The designing equation are solved using MATLAB Software and the results are analysed and compared using IE3D Simulator. The microwave filter is a building block that provides frequency selectivity in various microwave application like mobile, radar, satellite communication systems. The simulated results show the insertion loss and return loss of about -6.65 dB & - 55.49dB for N=3 and -7.23dB &-16.01 dB for N=5.Simulation has also been done for VSWR.

Required Data Collection Times for Steady and Quasi-steady Experiments

2017 ◽  
Author(s):  
Robert F. Roddy ◽  
David E. Hess
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Frequency Noise ◽  
Surface Ship ◽  
System A ◽  
Low Pass ◽  
Collection Period ◽  
Almost All ◽  
Low Pass Filters

One of the requirements in performing steady or quasi-steady experiments is the determination of adequate collection times so that the data will not be biased due to low frequency energy in the data stream. Since virtually all steady experiments run at DTMB have low pass filters in line with the signal conditioning, high frequency noise is not a consideration in determining the required collection times. At both EMB and DTMB almost all of the surface ship drag measurements were made using gravity type balances until about 1970. These balances used both springs and dampers to modify the natural frequency of the system so that a good average model drag could be determined in a 5-6 sec collection period. Submarine model experiments began using block gages to measure drag beginning in the late 1950's. For these experiments crude methods were used to damp the output data but, to the author’s knowledge, no methods were ever put into place that was analogous to the springs and damper system. A method for determining the required collection times for any steady or quasi-steady experiment is presented along with sample cases showing the necessity for, and the utility of, using such a method.

scholarly journals Design, Implementation, Comparison, and Performance analysis between Analog Butterworth and Chebyshev-I Low Pass Filter Using Approximation, Python and Proteus

2021 ◽  
Author(s):  
Navid Fazle Rabbi
Keyword(s):  
Signal Processing ◽  
Performance Analysis ◽  
Communication Systems ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Python Programming Language ◽  
Low Pass ◽  
And Performance ◽  
Low Pass Filters ◽  
Python Programming

Abstract Filters are broadly used in signal processing and communication systems in noise reduction. Butterworth, Chebyshev-I Analog Low Pass Filters are developed and implemented in this paper. The filters are manually calculated using approximations and verified using Python Programming Language. Filters are also simulated in Proteus 8 Professional and implemented in the Hardware Lab using the necessary components. This paper also denotes the comparison and performance analysis of filters using Manual Computations, Hardware, and Software.

scholarly journals Low-pass filters and differential tympanal tuning in a paleotropical bushcricket with an unusually low frequency call

2012 ◽  
Vol 216 (5) ◽  
pp. 777-787 ◽  
Author(s):  
K. Rajaraman ◽  
N. Mhatre ◽  
M. Jain ◽  
M. Postles ◽  
R. Balakrishnan ◽  
...  
Keyword(s):  
Low Frequency ◽  
Low Pass ◽  
Low Pass Filters

scholarly journals Second Order Low Pass RC Active Filter for Low Frequency Signal Processing

2020 ◽  
pp. 220-223
Keyword(s):  
Communication Systems ◽  
Low Frequency ◽  
Cmos Technology ◽  
Wide Frequency Range ◽  
Second Order ◽  
Frequency Range ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Cadence Tool

The different parameters define the characteristics of filter for various applications like: Biomedical applications, Defense communication systems, Wireless Communication systems etc. The mostly measured parameters for filter designing are frequency range, cut off frequency, gain, power consumption, and noise. In this paper, our work focuses on frequency range measurement at cut off frequency of Hz of second order low pass filter with designed using CMOS technology for IC fabrication. The proposed circuit gives the high frequency range at low frequency (100Hz – 10MHz) with 1mV 50Hz low power supply using complementary compound pair on the value of R=1K and C=10pH. This second order active low pass filter provides high amplification at the output with 4.861V. It is implemented and simulated on 180nm Cadence tool in terms of wide frequency range or band at cut off frequency of Hz to MHz.

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