A Harmonic and Size Reduced Ring Hybrid Using Coupled Lines

Lee, Hong-Seop; Choi, Kyoung Hwa; Hwang, Hee-Yong

doi:10.1109/lmwc.2007.892954

Cited by 38 publications

(32 citation statements)

References 3 publications

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“…Among them, the electrical lengths of the shunt stubs can be fixed to θ b = π/(2n) by the desired term to be rejected. The remaining three variables can be chosen from Equations (5) and (6). The normalized characteristic impedances of series and shunt lines are calculated using (5) and (6) for the series electrical length of 15 ∼ 35 • , which is the realizable range of characteristic impedances obtained.…”

Section: The Proposed Designmentioning

confidence: 99%

“…The remaining three variables can be chosen from Equations (5) and (6). The normalized characteristic impedances of series and shunt lines are calculated using (5) and (6) for the series electrical length of 15 ∼ 35 • , which is the realizable range of characteristic impedances obtained. The calculation results for the simultaneous suppression of the second and third terms harmonic suppression are plotted in Fig.…”

Section: The Proposed Designmentioning

confidence: 99%

“…As defected ground structure (DGS) can provide the same properties as EBG, a Wilkinson power divider using DGS was obtained with size reduction of 90% of the conventional divider and suppression levels of 18 and 16 dBs for the second and third harmonics in [4]. Furthermore, the compact 180 • ring hybrid coupler with EBG perforated on the microstrip transmission line can be found in [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Compact Branch-Line Coupler for Harmonic Suppression

Kim¹,

Kong²

2010

PIER C

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Abstract-This paper presents the modified design that can reject harmonic components in the branch-line coupler. After adding open stubs at the center of branch lines of the traditional design, their new network parameters can be found in order to maintain the conventional function at an operating frequency and suppress its harmonic terms chosen. Experimental results show the second and third harmonic suppressions to be −28.3 and −39.6 dBs, while maintaining its traditional performance at the fundamental frequency.

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Section: The Proposed Designmentioning

confidence: 99%

Section: The Proposed Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compact Branch-Line Coupler for Harmonic Suppression

Kim¹,

Kong²

2010

PIER C

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“…1(a) has been reported and widely adopted as a building block or low pass filter unit cell (LUC) in designing a compact low pass filter [1], compact wideband bandstop filters [2,3], an harmonic and size reduced ring hybrid [4], and a compact and harmonic suppressed Wilkinson power divider [5]. The PCL-OS demonstrates excellent performances, including its low pass filter with wideband rejection characteristics and sharp skirt response as well as its structural compactness.…”

Section: Introductionmentioning

confidence: 99%

Size and Harmonic Reduced Wilkinson Balun Using Parallel Coupled Line with Open Stub

Lee¹,

Hwang

2014

Journal of electromagnetic engineering and science

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In this paper, a size-reduced Wilkinson balun with wide harmonic-suppressed band is presented. An accurate analysis of the parallel coupled line with an open stub (PCL-OS) is carried out. The PCL-OS structure shows excellent low pass filter and harmonicsuppression characteristics, which is useful for designing a low pass filter unit cell (LUC) with a reduced size. The designed Wilkinson balun at a 2.45 GHz center frequency not only shows an excellent harmonic suppression including the 5th harmonics up to 14 GHz over 15 dB, but it also has an area reduced to 48% of the conventional one. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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“…In order to achieve great size reduction and harmonic suppression, simultaneously, a new low-pass filter (LPF) unit cell (LUC) is integrated into rat-race coupler design. Compared with [5], the LPF unit cell used in this paper is generalized because LPF unit cell used in [5] is just a special case. The prototype of the LPF was originally used to design a wide-stopband low-pass filter with three transmission zeros [6].…”

Section: Introductionmentioning

confidence: 99%

A harmonic suppression and size-reduced rat-race hybrid coupler using dual coupled-lines

Song

Deguchi

Tsuji

2012

IEICE Electron. Express

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Abstract:A newly proposed coupled-line low-pass filter structure is firstly integrated into rat-race coupler design in this paper for size reduction and harmonic suppression. This low-pass filter is composed of dual parallel coupled-lines with one open stub at the end. By properly substituting this low-pass filter unit cell (LUC) for each one of the six λ/4 sections in the conventional rat-race coupler, significant size reduction and harmonic suppression can be achieved while the property of this proposed coupler remains comparable to the conventional one for the passband (f 0 = 0.9 GHz) with 33% relative size. Transmission is suppressed below −20 dB from 2.5 GHz to 5.6 GHz, including the third, fourth, fifth and sixth harmonics.

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A Harmonic and Size Reduced Ring Hybrid Using Coupled Lines

Cited by 38 publications

References 3 publications

Compact Branch-Line Coupler for Harmonic Suppression

Compact Branch-Line Coupler for Harmonic Suppression

Size and Harmonic Reduced Wilkinson Balun Using Parallel Coupled Line with Open Stub

A harmonic suppression and size-reduced rat-race hybrid coupler using dual coupled-lines

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