scholarly journals Miniaturized substrate-integrated coaxial line bandpass filter with improved upper stopband

2017 ◽  
Vol 9 (7) ◽  
pp. 1441-1445 ◽  
Author(s):  
Yunlong Lu ◽  
Yi Wang ◽  
Taijun Liu ◽  
Bo Yu ◽  
Kai Li
Keyword(s):  
Theoretical Analysis ◽  
Fundamental Frequency ◽  
Bandpass Filter ◽  
Spiral Structure ◽  
Coaxial Line ◽  
Space Filling ◽  
Resonance Property ◽  
Circuit Structure ◽  
Frequency Ratios ◽  
Rejection Band

A miniaturized substrate-integrated coaxial line (SICL) bandpass filter with improved upper stopband using asymmetrical spiral stub-loaded resonators is presented in this paper. Owing to the space-filling feature of the spiral structure, the size of the proposed filter is significantly reduced. A theoretical analysis is carried out to examine the resonance property of the proposed resonator. It is found that the frequency ratios of the second and third harmonics to the fundamental frequency can be extended to 2.86 and 4.4. Benefiting from the circuit structure and SICL technology, the designed filter has a small size, wide stopband, low crosstalk, and high-density integration ability. The measured results show that the proposed filter, with dimensions of 0.051λ0 × 0.044λ0, operates at 1.056 GHz and the 20-dB rejection band is extended to 3.94f0.

scholarly journals Design of Wideband Bandpass Filter Based on Corrugated Disk Resonator with Multiple Resonant Modes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2614
Author(s):  
Qian Yang ◽  
Shuangyang Liu ◽  
Hongyu Shi ◽  
Kai-Da Xu ◽  
Xinyue Dai ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Bandpass Filter ◽  
Design Method ◽  
Center Frequency ◽  
Localized Surface Plasmons ◽  
Metallic Structure ◽  
Disk Resonator ◽  
Resonant Frequencies ◽  
Resonant Modes ◽  
Via Holes

A corrugated disk resonator with eight grooves is proposed for wideband bandpass filter (BPF) design. Due to the spoof localized surface plasmons resonances of the corrugated metallic structure, the dipole, quadrupole, hexapole modes, and a fundamental mode excited by the introduced short-circuited via holes are employed to realize four transmission poles (TPs) in the passband. The theoretical analysis is described by the electric field and current distributions on the resonator. The resonant frequencies can be tuned easily by the parameters of the structure, which can be used to adjust the center frequency and bandwidth of the BPF freely. Furthermore, two resonators are cascaded to obtain eight TPs to improve the selectivity performance. Finally, three fabricated filters demonstrate the design method.

Research and Analysis of Tunable Differential N-Path Band-Pass Filter

2020 ◽  
pp. 2150055
Author(s):  
Shuxiang Song ◽  
Guolun Liu ◽  
Mingcan Cen ◽  
Chaobo Cai
Keyword(s):  
Bandpass Filter ◽  
Noise Figure ◽  
Supply Voltage ◽  
Impedance Matching ◽  
Transmission Function ◽  
Center Frequency ◽  
Cmos Process ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Circuit Structure

Traditional filters usually have low Q and gain values and it is difficult to adjust their center frequencies. Moreover, it is very complicated to analyze their transmission charateristics through conventional methods. Therefore, in this paper, a tunable differential N-path bandpass filter that uses a new adjoint network method to analyze the transmission characteristics of the differential N-path structure is proposed. The filter circuit adopts a novel circuit structure consisting of two differential N-path structures, two transconductance amplifiers and an off-chip transformer. The differential structure eliminates even harmonics, the transconductance amplifier increases the circuit gain and the off-chip transformer acts as a balun, improving the filter’s Q value and achieving impedance matching. Unlike the traditional switching capacitance method used for analyzing the differential circuit structure, the method proposed in this paper does not involve complicated calculus operations. In fact, the method greatly simplifies these complex operations, and the transmission function of the circuit can be obtained through simple algebraic operations. The proposed filter was designed using TSMC 180[Formula: see text]nm CMOS process. Simulation results for a differential four-path bandpass filter formed under 1.2[Formula: see text]V supply voltage show that the gain of the filter is greater than 8.5 dB, the center frequency can be adjusted from 0.1[Formula: see text]GHz to 1[Formula: see text]GHz, the in-band insertion loss S11 is greater than 10 dB, the out-of-band IIP3 is greater than 10 dBm, the out-of-band rejection is 28 dB and the noise figure is less than 2.2 dB at [Formula: see text][Formula: see text]MHz.

scholarly journals NEW DUAL-BAND BANDPASS FILTER WITH WIDE UPPER REJECTION BAND

2012 ◽  
Vol 123 ◽  
pp. 371-384 ◽  
Author(s):  
Jen-Tsai Kuo ◽  
Shih-Wei Lai
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Rejection Band

Stability Problem Research of Infrared Camera Critical Point Image

2013 ◽  
Vol 655-657 ◽  
pp. 1592-1595
Author(s):  
Yan Qing Yan ◽  
Hong Liang ◽  
Ya Nan Guo ◽  
Yue Qi Zhou ◽  
Xiao Jing Bian
Keyword(s):  
Theoretical Analysis ◽  
Critical Point ◽  
Stability Problem ◽  
Infrared Camera ◽  
Cause Of Formation ◽  
Switch Structure ◽  
Circuit Structure ◽  
Point Image

In this paper, through theoretical analysis, find out the cause of formation of the infrared camera critical flicker problem and the relations of the internal switch structure, and through the circuit structure, the ways and specific measures are presented to solve the infrared camera critical flicker problem.

Theory of Helmholtz-Beat Frequencies

1984 ◽  
Vol 1 (3) ◽  
pp. 308-322 ◽  
Author(s):  
Rudolf A. Rasch
Keyword(s):  
Fundamental Frequency ◽  
Beat Frequency ◽  
Numerical Data ◽  
Fundamental Frequencies ◽  
The Absolute ◽  
Frequency Ratios

In musical tuning, deviations from the simple frequency ratios of pure consonant intervals are often necessary. These deviations are called temperings. They result in beats in the sounding interval. Rules are developed according to which the beat frequencies can be determined, both exactly and by way of easy integer approximations. Beat frequencies of consonant intervals are most easily expressed as relative beat frequencies, the quotient of the beat frequency and the lower fundamental frequency of the interval. The relative beat frequency is a constant for a certain interval in a certain tuning, whereas the absolute beat frequencies vary with fundamental frequencies. Also described are the relationships between the beat frequencies of the three intervals that make up a consonant triad. Numerical data are given for five model tunings: Pythagorean, equal, Silbermann, meantone, and Salinas.

A miniaturized bandpass filter implemented with substrate integrated coaxial line

2012 ◽  
Vol 55 (1) ◽  
pp. 131-133 ◽  
Author(s):  
Peng Chu ◽  
Wei Hong ◽  
Ke Wu ◽  
Jixin Chen ◽  
Hongjun Tang
Keyword(s):  
Bandpass Filter ◽  
Coaxial Line

scholarly journals Волновые эффекты в коаксиальном тракте при субнаносекундном переключении высоковольтного диода в режиме задержанного ударно-ионизационного пробоя

2021 ◽  
Vol 47 (13) ◽  
pp. 32
Author(s):  
М.С. Иванов ◽  
В.И. Брылевский ◽  
П.Б. Родин
Keyword(s):  
Experimental Data ◽  
Reflection Coefficient ◽  
Theoretical Analysis ◽  
High Voltage ◽  
Coaxial Line ◽  
High Voltage Pulse ◽  
Wave Processes ◽  
Wave Dynamics ◽  
Transmitted Waves ◽  
Diode Voltage

Theoretical analysis of wave processes in the coaxial line during subnanosecond switching of high-voltage pulse sharpening diode is presented. The relations between amplitudes of the incident, reflected and transmitted waves and experimentally measured voltages as well as between these voltages and triggering generator pulse are established. The effect of the diode voltage doubling before switching is calculated. On the basis of the obtained relations and experimental data the time dependence of the sharpening diode reflection coefficient is determined and the wave dynamics in the coaxial line during avalanche switching are reconstructed.

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