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

Song, Wei; Deguchi, Hiroyuki; Tsuji, Mikio

doi:10.1587/elex.9.1083

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…In spite of the many advantages and applications, the large circuit area requirement especially at lower microwave frequencies and higher-order harmonics are the inherent drawbacks of the conventional RRC. Different approaches such as stub-loaded transmission lines [2, 3], low-pass filter unit cell (LUC) [4], and meandering technique [5, 6] have been reported to reduce the size and improve the harmonic suppression capability of the RRCs. Next, to meet the wideband requirement of modern communication systems, microwave devices with wide bandwidth and compact size are in demand.…”

Section: Introductionmentioning

confidence: 99%

Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines

Kumar

Karthikeyan

2016

Int. J. Microw. Wireless Technol.

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This paper presents the design of a size miniaturized and harmonic suppressed wideband double-section rat-race coupler (RRC). Series and shunt stepped-impedance transmission line units are proposed to replace the quarter wavelength transmission lines in the conventional design of wideband (50% fractional bandwidth) two-stage rat-race coupler. Design equations are derived using the lossless transmission line model. The proposed double-section RRC occupies only 14% area of the conventional coupler, with good return loss and isolation performances. In addition, the full-wave simulation and measured responses exhibit harmonic suppression up to at least fifth harmonic. The proposed design can be easily implemented using the standard printed circuit board etching process without any via-holes, bonding wires, and lumped elements, which make it very useful for wireless communication systems

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Section: Introductionmentioning

confidence: 99%

Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines

Kumar

Karthikeyan

2016

Int. J. Microw. Wireless Technol.

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“…These couplers, however, occupy a large space in an MIC or MMIC. The authors have also reported broadband/tri-band branch-line couplers utilizing open-circuited series stubs [7,8] [24] have also been reported. In these papers, hybrid rings in which a 270-degree line is replaced with a −90-degree CRLH-TL are proposed.…”

Section: Introductionmentioning

confidence: 99%

Design methods for broadband 3dB branch-line and rat-race hybrids

Kawai

Ohta

Enokihara

2013

IEICE Electron. Express

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This paper considers band-broadening design methods for branch-line and rat-race hybrids such as 90-and 180-degree hybrids. For the 90-degree hybrid, utilizing external matching networks composed of coupled-transmission lines, broadband characteristics with a relative bandwidth of over 40% can be obtained for a 3 dB hybrid designed for operation at 3 GHz based on the equivalent admittance approach. For the 180-degree hybrid, a rat-race hybrid in which right-handed transmission lines are replaced with composite right-/lefthanded transmission lines also realizes broadband characteristics. The validity of these design procedures has been demonstrated by electromagnetic simulations and experiments.

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“…Microstrip LPF is frequently used because of its easy fabrication and good skirt performance. However, it can handle only low power, only up to several hundreds of input power [1,2,3]. A tubular LPF using coaxial line capacitors of rectangular shape and air-core inductors was presented [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design of a compact low pass filter for high power RF generators

Park

Choi

2013

IEICE Electron. Express

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The low-pass filter (LPF) is a key component for high power RF generators generating 40.68 MHz sine wave, since the LPF should reject harmonic noises and handle high input power simultaneously. We propose a novel LPF, operating at 30 kW with good skirt performance. The proposed filter is a 7th order Butterworth type and consists of four capacitors and three inductors. The capacitors and inductors are implemented by copper plates, teflon insulators and copper plates with screws, respectively. The measured values of S 11 , S 21 and phase of the proposed LPF are À26.4 dB, À0.57 dB, and À163.5 degrees at 40.68 MHz, respectively. The S 21 values at 2nd (81.36 MHz) and 3rd (122.04 MHz) harmonics are À19.5 dB and À29.3 dB, respectively. The measured spectrum data on the surface of RF cable that is connected to the LPF output were À41.0 dBm at 40.68 MHz and À78.8 dBm at 81.36 MHz. The difference value of 37.8 dB is sufficient for harmonic suppression. In addition, arcing and thermal problems do not occur.

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

Cited by 3 publications

References 6 publications

Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines

Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines

Design methods for broadband 3dB branch-line and rat-race hybrids

Design of a compact low pass filter for high power RF generators

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