Compact foldable coupled-line cascade couplers

Park, M.-J.; Lee, B.

doi:10.1049/ip-map:20045181

Cited by 14 publications

(24 citation statements)

References 3 publications

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“…z e and z o are normalized even and odd mode impedances with respect to the characteristic impedance of the coupled line section or the connecting transmission line. Similarly for the second structure, shown in Figure 1, an analytical solution exists for the coupling coefficient and is as follows [9]:…”

Section: Unit Section Couplermentioning

confidence: 99%

“…In the design of a broadband multisection coupler, this property will be used to simplify the overall structure. The electrical length of the uncoupled transmission line in the two structures using the notations used in [8] and [9] has the following relation: Figure 3 shows the generic schematic of our proposed unit section coupler, consisting of two coupled-line sections with the same coupling coefficient. These coupled line sections are connected with two transmission lines, which are uncoupled to the rest of the circuit, and their lengths are arbitrary.…”

Section: Unit Section Couplermentioning

confidence: 99%

“…The use of some transmission line sections between the coupled line sections as delay lines for equalizing the even and odd phase velocities was introduced in [7], which results in considerable directivity improvement. The idea of combining two coupled line sections and connecting the uncoupled line was used by other authors for reducing the size of the directional coupler [8,9]. It was shown that inserting a transmission line between two coupled line sections introduces flexibility in the layout and dimension of the coupler while the coupling remains unaffected.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the two structures introduced in [8] and [9] are combined to form a new flexible two section coupler with uncoupled transmission lines between them. If the magnitude of the coupling coefficient is of concern and the phase response is superfluous, the circuit parameters of some of these structures are related.…”

Section: Introductionmentioning

confidence: 99%

“…The analytical solution for the coupling factor (C) of the first structures is as follows [8]: Figure 1. Schematic of the unit section coupler: a) proposed in [8], b) proposed in [9].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Broadband high power stripline compact multisection coupled-line coupler for VHF and UHF applications

Taherkhani¹,

Ahmadi²

2017

Turk J Elec Eng & Comp Sci

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Section: Unit Section Couplermentioning

confidence: 99%

Section: Unit Section Couplermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The analytical solution for the coupling factor (C) of the first structures is as follows [8]: Figure 1. Schematic of the unit section coupler: a) proposed in [8], b) proposed in [9].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Broadband high power stripline compact multisection coupled-line coupler for VHF and UHF applications

Taherkhani¹,

Ahmadi²

2017

Turk J Elec Eng & Comp Sci

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Size‐reduced defected ground microstrip directional coupler

Mohra

Alkanhal

Abdullah

2010

Micro & Optical Tech Letters

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A compact UWB monopole antenna with dual band-notched characteristics for WLAN has been designed and manufactured. The dual band-notched characteristic at 2.4 GHz/5.8 GHz is achieved by cutting a folded stripline slot along the boundary of the radiation patch and by incorporating a pair of inverted-Lshaped slot on the ground. The proposed antenna has the frequency band from 2.2 GHz to 11 GHz for VSWR less than 2.0 with a rejection band in the frequency bands of 2.3-2.9 GHz and 5.5-6.3 GHz. The proposed antenna having dual frequency band-notched function and good electrical characters is promising for wireless communication applications.ABSTRACT: In this article, size reduction and harmonic suppression in coupled-lines microstrip directional couplers is attained using dumbbell, and reshaped dumbbell slots, as defected patterns, specifically placed under the metering position in the ground plane. Quantitative investigation of the performance of the directional coupler as controlled by the variations of the DGS rectangular slots height, DGS gap length, and the DGS reshaped rectangular slot height is presented. This concept is further illustrated experimentally for a 12 dB coupler realized on RT/ Duroid 5880 substrate. The proposed DGS design confers size reduction because of the shift of the operating frequency to lower values. The measurements are in a good agreement with the simulated results and emphasize the size reduction and the harmonics suppression of the DGS coupled-lines microstrip directional coupler.

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Theoretical limits on miniaturization of directional couplers designed as a connection of tightly coupled and uncoupled lines

Wincza

Gruszczyński

2012

Micro & Optical Tech Letters

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The problem of miniaturization of coupled‐line directional couplers designed as a connection of tightly‐coupled and uncoupled sections has been comprehensively investigated for the first time.It has been proven that in such couplers the stronger coupling is available in the structure, the greater miniaturization is achieved. A novel approach allowing for theoretical analysis of such couplers has been proposed. Moreover, a special case has been considered, in which couplers are designed with the use of a single section of uncoupled lines placed in the middle of a tightly‐coupled section. The proposed approach has been utilized for derivation of theoretical limits describing the maximum achievable minimization of the overall electrical length of couplers designed as a connection of coupled and uncoupled lines. The theoretical analyses have been confirmed by the measurements of two different directional couplers designed with the use of the proposed approach. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:223–230, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27233

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Compact foldable coupled-line cascade couplers

Cited by 14 publications

References 3 publications

Broadband high power stripline compact multisection coupled-line coupler for VHF and UHF applications

Broadband high power stripline compact multisection coupled-line coupler for VHF and UHF applications

Size‐reduced defected ground microstrip directional coupler

Theoretical limits on miniaturization of directional couplers designed as a connection of tightly coupled and uncoupled lines

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