Bandgap characteristics of coupled-line section with periodic corrugation and its application to parallel-coupled microstrip filter design with an extended upper stopband

2008 ◽  
Author(s):  
Jen-Tsai Kuo ◽  
Yu-Feng Lee
Keyword(s):  
Filter Design ◽  
Coupled Line ◽  
Microstrip Filter ◽  
Line Section

scholarly journals A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

2022 ◽  
Vol 12 (2) ◽  
pp. 875
Author(s):  
Nan Zhang ◽  
Xiaolong Wang ◽  
Chunxi Bao ◽  
Bin Wu ◽  
Chun-Ping Chen ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Return Loss ◽  
Circuit Simulation ◽  
Characteristic Impedance ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Variable Parameters ◽  
Line Section ◽  
Original Topology ◽  
Impedance Parameters

In this paper, a novel synthetization approach is proposed for filter-integrated wideband impedance transformers (ITs). The original topology consists of N cascaded coupled line sections (CLSs) with 2N characteristic impedance parameters. By analyzing these characteristic impedances, a Chebyshev response can be derived to consume N + 2 design conditions. To optimize the left N − 2 variable parameters, CLSs were newly substituted by transmission lines (TLs) to consume the remaining variable parameters and simplify the circuit topology. Therefore, there are totally 2N − N − 2 substituting possibilities. To verify the proposed approach, 25 cases are listed under the condition of N = 5, and 7 selected cases are compared and discussed in detail. Finally, a 75–50 Ω IT with 100% fractional bandwidth and 20 dB bandpass return loss (RL) is designed and fabricated. The measured results meet the circuit simulation and the EM simulation accurately.

scholarly journals Differential Bi-Level Microstrip Directional Coupler with Equalized Coupling Coefficients for Directivity Improvement

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 547
Author(s):  
Slawomir Gruszczynski ◽  
Robert Smolarz ◽  
Krzysztof Wincza
Keyword(s):  
Coupling Coefficient ◽  
Dielectric Layer ◽  
Directional Coupler ◽  
Capacitive Coupling ◽  
Coupling Coefficients ◽  
Coupled Line ◽  
Line Section ◽  
Measurement Results

In this paper, a bi-level microstrip differential directional coupler has been investigated. It has been shown that the equalization of coupling coefficients can be successfully made with the use of appropriate dielectric stack-up and conductor geometry. The application of additional top dielectric layer can ensure proper equalization of coupling coefficients by lowering the value of capacitive coupling coefficient to the value of the inductive one. The theoretically investigated coupled-line section has been used for the design of a 3-dB differential directional coupler. The measurement results are compared with the theoretical ones.

COMPACT MICROSTRIP BAND-PASS FILTER FOR EMI REDUCTION

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Kabir Ibrahim Jahun ◽  
Hussein Mohamed Hagi Hassan Abdirahman Mohamud Shire ◽  
Ali Orozi Sougui ◽  
S. H. Dahlan
Keyword(s):  
Filter Design ◽  
Stop Band ◽  
Band Pass Filter ◽  
Defected Ground Structure ◽  
Coupled Line ◽  
Pass Filter ◽  
Filter Structure ◽  
Coupled Lines ◽  
Band Pass ◽  
Compact Design

Compact microstrip band-pass filter design using parallel coupled lines is presented in this paper. The microstrip lines are calculated and constructed using CST studio with two input and output ports of the filter structure are printed over Defected Ground Structure (DGS).The proposed symmetrical structure offers a simple and compact design while exhibiting an improved stop-band characteristics in comparison to conventional coupled microstrip line filter structure. The simulation and measurements of 2GHz prototype band pass filter are presented. The measured result agrees well with the simulation data. Compared with conventional parallel coupled line band pass filter, the second, third and fourth spurious responses are suppressed; in addition, the size of the prototype filter circuit is reduced up to 20.8%.  

scholarly journals Design of Oscillator Based on A Deformed Structure Parallel Coupled Line Filter

2018 ◽  
Vol 232 ◽  
pp. 02042
Author(s):  
Enhao Wang ◽  
Jin Pan ◽  
Deqiang Yang ◽  
Wenzhe Liu ◽  
Tao Tang
Keyword(s):  
Phase Noise ◽  
Output Power ◽  
Filter Design ◽  
Radar System ◽  
High Output Power ◽  
It Use ◽  
Feedback Form ◽  
Coupled Line ◽  
Low Phase Noise ◽  
High Output

This paper proposes an oscillator based on a deformed structure parallel coupled line filter design. The requirements of this design are the output power meet 10dBm, and phase noise is below -90dBc/Hz at 10kHz off the centre point. This work adopts parallel positive feedback form, and it use Parallel Coupled Line Filter, making this design simple in structure and low in cost. This design has low phase noise and high output power features, working at 2.4GHz, intended to use in a through-the-wall radar system.

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