To compact branch-line couplers using parallel high-impedance transmission lines

2010 ◽  
Vol 52 (9) ◽  
pp. 1996-1999 ◽  
Author(s):  
Mohammad Khalaj-Amirhosseini ◽  
Mohammad Yazdani
Keyword(s):  
Transmission Lines ◽  
Branch Line ◽  
High Impedance

Erratum: To compact branch-line couplers using parallel high-impedance transmission lines

2011 ◽  
Vol 53 (3) ◽  
pp. 700-700
Author(s):  
Mohammad Khalaj-Amirhosseini ◽  
Mohsen Yazdani
Keyword(s):  
Transmission Lines ◽  
Branch Line ◽  
High Impedance

scholarly journals New design of wideband microstrip branch line coupler using T-shape and open stub for 5G application

2021 ◽  
Vol 11 (2) ◽  
pp. 1346
Author(s):  
Ali Abdulateef Abdulbari ◽  
Sharul Kamal Abdul Rahim ◽  
Mohamad Zoinol Abidin Abd Aziz ◽  
K. G. Tan ◽  
N. K. Noordin ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Communication Systems ◽  
High Performance ◽  
Return Loss ◽  
Coupling Factor ◽  
Center Frequency ◽  
Branch Line ◽  
High Impedance ◽  
Compact Size ◽  
Simple Difference

A new design of wideband branch-line coupler (BLC) using T-shape with open stub microstrip line is proposed. The branch line coupler is integrated with low and high impedance λ/4 transmission lines to achieve the comparatively compact size of (27.2 mm × 16.5 mm). operating the bandwidth in simulated of BLC from 2.9 to 4 GHz is obtained 30.22% with a frequency center of 3.5 GHz. Meanwhile, the measured bandwidth of the BLC is cover from 2.8 GHz to 4.22 GHz is equal 33.40% at the center frequency 3.55 GHz respectively. The BLC simulated has low isolation and high return loss of -29.28 dB and -30.69 dB at the center frequency 3.5 GHz.Whereas, the measured result has a simple difference in the return loss and isolation are -27.43dB and -24.46 dB at the frequency 3.55GHz respectively. This BLC design has a good coupling factor of -2.97 and insertion loss of -3.65 dB. Furthermore, it obtains an excellent amplitude and phases different between two output of ±0.1 and 93.6°±3.4° with high performance. There is a good agreement between the simulated result and the measured result. This branch line coupler design used for 5G applications for future wireless communication systems.

Novel Miniaturized Harmonic Suppression Branch-Line Coupler Using Artificial Transmission Lines for UHF Applications

2011 ◽  
Vol E94-C (7) ◽  
pp. 1237-1239
Author(s):  
Chia-Hao KU ◽  
Hsien-Wen LIU ◽  
Yu-Shu LIN ◽  
Kuei-Yi LIN ◽  
Pao-Jen WANG
Keyword(s):  
Transmission Lines ◽  
Harmonic Suppression ◽  
Branch Line

scholarly journals Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

2017 ◽  
Vol 14 (18) ◽  
pp. 20170834-20170834
Author(s):  
Lamin Zhan ◽  
Zuwei Li ◽  
Wenguang Li ◽  
Xiang Zhang
Keyword(s):  
Transmission Lines ◽  
Dual Band ◽  
Branch Line ◽  
Line Structure ◽  
Dual Transmission

Design of tri-band branch-line couplers using novel tri-band transmission lines

2014 ◽  
Author(s):  
Han Ren ◽  
Jin Shao ◽  
Mi Zhou ◽  
Bayaner Arigong ◽  
Jun Ding ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Branch Line

A novel compact lowpass filter with sharp roll-off and wide stopband

2019 ◽  
Vol 12 (1) ◽  
pp. 21-33
Author(s):  
M. Hayati ◽  
AS. Abdipour ◽  
AR. Abdipour
Keyword(s):  
Transmission Lines ◽  
Lowpass Filter ◽  
Transmission Zeros ◽  
High Impedance ◽  
Attenuation Level ◽  
Measurement Results ◽  
High Figure ◽  
Frequency Behavior ◽  
Better Than ◽  
Resonance Cell

AbstractIn this paper, a microstrip lowpass filter adopting two main resonators with steep transition band and wide rejection band has been introduced. The first main resonance cell consists of meandered transmission lines which are loaded by modified T-shaped patches. The second main resonator is composed of high-impedance lines loaded by polygon patches. To obtain a steep skirt performance, the first and second resonators have been combined. Moreover, employing eight high–low impedance folded stubs and two rectangular open-stubs as suppressing cells has resulted in improving the stopband features. To comprehend the frequency behavior of the employed resonators and also their combination, the formulas of the transmission coefficient, reflection coefficient, and the transmission zeros of their equivalent LC circuits have been extracted, separately. According to the measurement results, the −3 dB operating frequency of this filter is 1.65 GHz. Moreover, a relative stopband bandwidth equal to 166% with a corresponding attenuation level of 23 dB and a sharp roll-off rate (393.61 dB/GHz) have been achieved. In the passband region from DC to 1.632 GHz, the insertion loss and return loss are better than 0.0763 and 15.85 dB, respectively, proving an acceptable in-band performance. Finally, the implemented structure brings about a high figure-of-merit equal to 81 672.

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