scholarly journals A COUPLED-LINE BAND-STOP FILTER WITH THREE-SECTION TRANSMISSION-LINE STUBS AND WIDE UPPER PASS-BAND PERFORMANCE

2011 ◽  
Vol 119 ◽  
pp. 407-421 ◽  
Author(s):  
Yongle Wu ◽  
Yuanan Liu
Keyword(s):  
Transmission Line ◽  
Pass Band ◽  
Coupled Line ◽  
Band Stop Filter

A Reconfigurable Compact Coupled Line Multiple-Band Bandpass Filter

2013 ◽  
Vol 655-657 ◽  
pp. 1555-1561
Author(s):  
Wen Ko ◽  
Man Long Her ◽  
Ming Wei Hsu ◽  
Yu Lin Wang
Keyword(s):  
Transmission Line ◽  
Bandpass Filter ◽  
Dual Band ◽  
Pass Band ◽  
Coupled Line ◽  
Circuit Structure ◽  
Coupled Lines ◽  
In Series ◽  
Multiple Band ◽  
Triple Band

This study proposes a circuit structure with reconfigurable multiple bands bandpass filter. This circuit can provide a triple-band or dual-band bandpass facility by adjusting two open stubs (L6 and L7) location. The circuit design used three sections of transmission line in series, the two sets of the coupled lines connected to the gap in each transmission line, and two open stubs in the appropriate locations. The design and manufacturing of the circuit structure is innovative and simple. The center frequencies of the triple-band bandpass filter are set at 2.4, 4.2, and 6.5 GHz, respectively, while the center frequencies of the dual-band bandpass filter are the two lower pass band of the triple-band bandpass filter at 2.4 and 4.2GHz. The filters were simulated using the full-wave electromagnetic simulator, IE3D, and measured by Anritsu-37269D. The simulated and measured results show good agreement in the frequency of interest.

scholarly journals Couplinator: A simple computational tool for synthesis of multi-section coupled-line filter based on MPCM-TLM technique

2021 ◽  
pp. 1-10
Author(s):  
E. Faghand ◽  
S. Karimian ◽  
E. Mehrshahi ◽  
N. Karimian
Keyword(s):  
Comparative Analysis ◽  
Transmission Line ◽  
High Frequency ◽  
Computational Tool ◽  
Cad Tools ◽  
Coupled Line ◽  
High Frequency Structure Simulator ◽  
Transmission Line Method ◽  
Set Up ◽  
Planar Circuit

Abstract A new simple computational tool is proposed for the synthesis of multi-section coupled-line filters based on combined modified planar circuit method (MPCM) and transmission line method (TLM) analysis, referred to as MPCM-TLM. Due to its fundamentally simple architecture, the presented tool offers significantly faster optimization of coupled-line filters – for exactly the same initial simulation set-up – than other costly commercially-available tools, giving equally reliable results. Validity and accuracy of the proposed tool have been verified through the design of 3rd, 5th, and 7th order coupled-line filters and comparative analysis between results obtained from the proposed approach and the high-frequency structure simulator. A remarkable 99% time reduction in the analysis is recorded in the case of 7th order filter using the proposed tool, for almost identical results to HFSS. Therefore, it can be confidently claimed that the proposed technique can be used as a reliable alternative to existing complex, costly, processor-intensive CAD tools.

A novel Ka-band MMIC coupled filter with harmonic suppression

Circuit World ◽  
2020 ◽  
Vol 46 (3) ◽  
pp. 169-173
Author(s):  
Jin Guan ◽  
Min Gong ◽  
Bo Gao
Keyword(s):  
Pass Band ◽  
Wave System ◽  
Harmonic Suppression ◽  
Low Loss ◽  
Coupled Line ◽  
Ka Band ◽  
Content Type ◽  
Harmonic Frequencies ◽  
Full Wave ◽  
On Chip

Purpose A novel Ka-band compact parallel-coupled microstrip bandpass filter with harmonic suppression performance has been designed, implemented and tested on GaAs MMIC. Design/methodology/approach This proposed filter consists of modified coupled-line units with T-shaped open-stubs. Findings The proposed filter with T-shaped open-stubs is valuable in performance with low loss at fundamental frequency, suppression at harmonic frequencies and small size. The simulation is based on full-wave electromagnetic analysis and the measurement is based on chip test. It shows an insertion loss below 1.2 dB, return loss better than 20 dB in the pass band and high than 28 dB suppression at harmonic frequencies. Originality/value This Ka-band MMIC filter with harmonic suppression is attractive for the millimeter-wave system.

COMPACT WILKINSON PASS-BAND FILTERING POWER DIVIDER BASED ON QUARTER-WAVELENGTH SIDE-COUPLED RING

2014 ◽  
Vol 23 (10) ◽  
pp. 1450135
Author(s):  
YONGLE WU ◽  
QIANG LIU ◽  
JUNYU SHEN ◽  
YUANAN LIU
Keyword(s):  
Low Cost ◽  
Single Layer ◽  
Power Divider ◽  
Pass Band ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Quarter Wavelength ◽  
Wilkinson Power Divider ◽  
Isolation Performance ◽  
Wavelength Side

A Wilkinson power divider with improved bandpass filtering and high isolation performance is proposed. These characteristics are achieved by replacing the quarter-wavelength transmission line in the conventional coupled line Wilkinson power divider with quarter-wavelength side-coupled ring (QSCR). Additional features such as DC blocking between arbitrary two ports, single-layer via-less structure for low-cost fabrication and convenient integration (as only one isolation resistor required) are highlighted. A 2-GHz Wilkinson microstrip power divider with a fractional bandwidth of 4% has been fabricated and experimentally characterized. The consistency between simulated and measured results validates the effectiveness of our proposed design.

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