Electrical conductivity and capacitance spectra of Bi1.37Sm0.13Zn0.92Nb1.50O6.92 pyrochlore ceramic in the range of 0–3 GHz

In this work, the electrical properties of samarium-doped bismuth niobium zinc oxide ( Sm -doped BZN ) pyrochlore ceramics are investigated by means of temperature dependent electrical conductivity and capacitance spectroscopy in the frequency range of 0–3 GHz. It was observed that the novel dielectric Sm - BZN ceramic exhibits a temperature and electric field dependent dielectric breakdown. When measured at 300 K, the breakdown electric field is 1.12 kV/cm and when heated the breakdown temperature is ~ 420 K. The pyrochlore is thermally active above 440 K with conductivity activation energy of 1.37 eV. In addition, the room temperature capacitance spectra reflected a resonance–antiresonance switching property at 53 MHz when subjected to an AC signal of low power of 5 dBm. Furthermore, when the Sm - BZN ceramics are used as microwave cavity and tested in the frequency range of 1.0–3.0 GHz, the cavity behaves as low pass filter with wide tunability up to a frequency of 1.91 GHz. At this frequency it behaves as a band rejection filter that blocks waves of 1.91 GHz and 2.57 GHz frequencies. These properties of the Sm -doped BZN are promising as they indicate the usability of the ceramics in digital electronic circuits as resonant microwave cavities suitable for the production of low pass/rejection band filters.

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CONFIGURABLE HARMONIC FILTERS FOR SHORT-WAVE TRANSMITTERS

RADIO COMMUNICATION TECHNOLOGY ◽

10.33286/2075-8693-2020-47-87-97 ◽

2020 ◽

pp. 87-97

Author(s):

A. G. Zinovyev ◽

I. A. Shestakov

Keyword(s):

Short Wave ◽

Capacitive Coupling ◽

Discrete Variable ◽

Frequency Range ◽

Pass Filter ◽

Low Pass Filter ◽

Coupling Capacitor ◽

Harmonic Filter ◽

Low Pass ◽

Low Pass Filters

Harmonic filters of short-wave transmitters, tunable in the frequency range using discrete variable capacitors, are presented. A comparison of a harmonic filter based on tunable LC low-pass filters with inductive coupling between the filter inductors is carried out with a similar harmonic filter, each LC low-pass filter of which con-tains an additional capacitive coupling capacitor connected between the two filter links and significantly changed the parameters of the harmonic filter.

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

International Journal for Research in Engineering Application & Management ◽

10.35291/2454-9150.2020.0467 ◽

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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Design and Implementation of a Kind of Ship Underwater Electric Field Signal Collection Equipment Hardware

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.945-949.2102 ◽

2014 ◽

Vol 945-949 ◽

pp. 2102-2105 ◽

Cited By ~ 1

Author(s):

Xiao Bei Wang ◽

Li Xia ◽

Xiang Jun Wang ◽

Yi Liu

Keyword(s):

Electric Field ◽

Low Noise ◽

Electric Signal ◽

Instrumentation Amplifier ◽

Signal Acquisition ◽

Three Dimension ◽

Pass Filter ◽

Low Pass Filter ◽

Signal Collection ◽

Low Pass

Based on the characteristics that ship underwater electric signal is waek, a kind of ship underwater electric signal acquisition equipment of hardware structure is designed. With instrumentation amplifier of high-precision and low noise and low pass filter module, the electric field signal collected by three dimension sensor is filtered and amplified. It ensures the integrity and validity of acquisition signal.

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