Ultra-Broadband Directional Couplers Using Microstrip With Dielectric Overlay in Millimeter-Wave Band

Pelaez-Perez, A. M.; Almorox-González, P.; Alonso, J.I.; González-Martín, and J.

doi:10.2528/pier11042703

Cited by 13 publications

(9 citation statements)

References 14 publications

(25 reference statements)

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“…The first one is a 10 dB asymmetric five-section slot-coupled directional coupler, that operates from 1.2 to 12 GHz. It offers a high coupling accuracy of 10 ± 0.6 dB and return loss and isolation better than 23 dB and 28 dB respectively, improving previously reported results in terms of fractional bandwidth and performance [2,[4][5][6]. The second one is a three-section symmetric quadrature hybrid similar to the coupler recently used to realize a high performance six-port IQ demodulator with full UWB coverage [19].…”

Section: Introductionmentioning

confidence: 54%

“…Besides, as it will be shown in Section 3, the introduction of corrugations in the slot does not significantly affect the modal impedances. Therefore, this technique makes it possible to develop a more robust design strategy than previously reported methods [2,3,5,6,11], since it allows the phase velocity equalization problem to be decoupled from the classical TEM coupler design based on the selection of adequate impedance values for the sections.…”

Section: Introductionmentioning

confidence: 99%

“…In coupled microstrip lines, several techniques have been proposed to overcome these difficulties: reentrant mode directional couplers [2], patterned ground plane directional couplers [3], inductively compensated couplers [4], directional couplers with grooved substrates [5], directional couplers with dielectric overlay [6], modified vertically installed planar couplers [7], rat-race couplers [8], nonuniform couplers [9,10], etc.. However, these techniques cannot completely compensate even and odd mode phase velocities as they partially affect both modes field patterns or require complete redesign of circuits.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High Performance Multi-Section Corrugated Slot-Coupled Directional Couplers

Moscoso-Mártir

Molina-Fernández²,

Ortega-Moñux³

2013

PIER

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Abstract-In this paper a robust technique for the design of high performance directional couplers is proposed.It combines the advantages of wiggly coupled lines and slot-coupled lines but overcomes their main limitations. The key to this novel technique is a new corrugated slot that allows perfect compensation of the even and odd mode phase velocities and can be easily designed using BlochFloquet theory, yielding outstanding performance. To demonstrate the validity of the proposed technique, the design of two different wideband directional couplers is presented. The first design consists of a 10 dB asymmetric directional coupler with a one decade bandwidth (1.2-12 GHz) that exhibits a coupling accuracy of 10 ± 0.6 dB, a return loss better than 23 dB and an isolation better than 28 dB across the complete frequency band. The second design consists of a symmetric quadrature hybrid that operates over the complete UWB band (3.1 to 10.6 GHz) showing an amplitude and phase imbalance between the output ports lower than ±0.5 dB and ±0.7 • , respectively.

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Section: Introductionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Performance Multi-Section Corrugated Slot-Coupled Directional Couplers

Moscoso-Mártir

Molina-Fernández²,

Ortega-Moñux³

2013

PIER

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“…In spite of many advantages, these antennas suffer from some disadvantages which include their low efficiency, low power, high Q, poor polarization purity, spurious feed radiation and very narrow bandwidth [11][12][13][14][15][16][17]. There have been some efforts spent using various techniques to improve the performance of such antennas for their widespread applications.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement of Microstrip Antenna Array Using Dummy Ebg Pattern on Feedline

Gujral¹,

Li²,

Yuan³

et al. 2012

PIER

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Abstract-Microstrip patch antennas have several advantages over conventional antennas including their low profile structure, light weight and low cost. As such, they have been widely used in a variety of applications. However, one of the major drawbacks of this antenna is the low bandwidth. In this paper, bandwidth of a dual patch antenna is improved by etching dummy EBG pattern on the feedline. Effects of different positions of the feedline on the bandwidth are also studied. A good improvement in bandwidth for the antenna with the dummy EBG pattern when compared to the reference antenna is obtained for all the feedline positions.

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“…Directional coupler is a fundamental component especially in microwave measurement system [1,2]. References [3][4][5] reported that because of the relative stable structure and properties of rectangular waveguide directional coupler, it was extensively used in microwave engineering to monitor, measure and separate incident power, etc.…”

Section: Introductionmentioning

confidence: 99%

Directional Coupler Using Multi-Stage Coupled Structure Theory

Chen¹,

Tong²,

Tian³

et al. 2013

PIER C

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Abstract-This paper presents a new directional coupler design, which can increase power capacity working with S band. The design concept is based on multi-stage coupled structure. Aim is to increase the size of coupling aperture by reducing the coupling degree of each stage structure. In view of this, multi-stage coupled structure theory is utilized to improve the directivity of directional coupler, coupling flatness and power capacity. According to the derivation of theory, it can be deduced that the sum of the coupling degree of single stage coupling structure is equal to the coupling degree of twostage coupling directional coupler (TSCDC), and the directivity of TSCDC depends on the directivity of the first stage coupling structure. Then, rectangular waveguide two-stage coupled directional coupler is designed and fabricated. The measured results demonstrate fullband from 1.72 to 2.61 GHz with coupling flatness < 0.65 dB and the directivity > 26 dB.

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Ultra-Broadband Directional Couplers Using Microstrip With Dielectric Overlay in Millimeter-Wave Band

Cited by 13 publications

References 14 publications

High Performance Multi-Section Corrugated Slot-Coupled Directional Couplers

High Performance Multi-Section Corrugated Slot-Coupled Directional Couplers

Bandwidth Improvement of Microstrip Antenna Array Using Dummy Ebg Pattern on Feedline

Directional Coupler Using Multi-Stage Coupled Structure Theory

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