Design of Cruciform Directional Couplers in E-Plane Rectangular Waveguide

Kishihara, Mitsuyoshi; Yamane, Kuniyoshi; Ohta, Isao

doi:10.1109/mwsym.2006.249712

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…Several wavelengths long have to be taken to achieve 3 dB coupling and full bandwidth. Cruciform directional couplers in E‐plane rectangular waveguide [8] or in H‐plane rectangular waveguide [9], cavity‐type directional couplers [10] and narrow‐wall directional couplers [2] are compact and with tight coupling, however, their fractional bandwidth is less than 30%.…”

Section: Introductionmentioning

confidence: 99%

Compact 3‐dB waveguide hybrid with full bandwidth

Wang

Tian

2016

Electron. lett.

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A compact waveguide 3-dB hybrid with full bandwidth is proposed in this Letter. The tight coupling and full bandwidth of Ka-band (from 26.3 to 40 GHz) are achieved by introducing multi-sections of waveguide with different width and depth, together with loaded posts on the bottom of some waveguide sections. The whole structure is symmetric both longitudinally and transversely (patent pending). The measured results show that return loss and isolation of the hybrid better than 25 dB and 26 dB, respectively, phase difference of the two output terminals within 90°± 3°and the power-split unbalance within 3.1 dB ± 0.5 dB are achieved over the full Ka-band waveguide bandwidth. Introduction: The 3 dB waveguide hybrids are widely used in many microwave and millimetre systems for branching and synthesis of signal power as well as generating desired power splitting with certain specification requirements, such as power ratio, frequency bandwidth, directivity and so on. Ka-band is typically used for satellite communications for its significantly wide frequency bandwidth. Hence the design of a broadband waveguide hybrid has profound practical significance. To achieve wider bandwidth, many approaches have been proposed and practiced, such as using continuous apertures [1] configurations, narrow-wall structures [2] and multi-aperture [3-7]. These couplers mainly contain two inline waveguides, which are coupled through one of the narrow or broad walls. Several wavelengths long have to be taken to achieve 3 dB coupling and full bandwidth. Cruciform directional couplers in E-plane rectangular waveguide [8] or in H-plane rectangular waveguide [9], cavity-type directional couplers [10] and narrow-wall directional couplers [2] are compact and with tight coupling, however, their fractional bandwidth is less than 30%. This Letter will show the realisation of a compact Ka-band waveguide 3-dB hybrid with full bandwidth. The measured results indicate that from 26.3 to 40 GHz (entire Ka-band range), the coupling coefficient is 3.1 ± 0.5 dB, return loss and isolation of the hybrid are better than 25 dB and 26 dB, respectively; phase difference of the two output terminals is within 91°± 3°.

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Section: Introductionmentioning

confidence: 99%

Compact 3‐dB waveguide hybrid with full bandwidth

Wang

Tian

2016

Electron. lett.

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“…Rectangular waveguide directional couplers are broadly investigated [5]. It is well known that the rectangular waveguide structures have many advantages over planar transmission lines for millimeter band application, such as low loss, high Q, and high power handling capacity [6]. However, they are difficult to manufacture and integrate with planar circuitry due to their 3-Dimensional geometry.…”

Section: Introduction In Rf and Microwave Wave Communication Dirementioning

confidence: 99%

“…For many microwave applications, a number of components based on the SIW technology have been proposed over the past years. Components such as filters [6], couplers [8], oscillators and slot array antenna. The fabrication of SIW is possible using standard Printed Circuit Board (PCB) technique [9].…”

Section: Introduction In Rf and Microwave Wave Communication Dirementioning

confidence: 99%

Wideband Directional Coupler for X-band using SIW Technique

Vala¹,

Patel²,

Chaudhari³

et al. 2015

IJERT

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In this article, compact and wideband directional coupler has been proposed based on substrate integrated waveguide technique for X-band applications. The bandwidth of directional coupler has enlarged by tapering the coupling section. This coupler consists of two narrow apertures on the common broadside wall of two adjacent SIWs and four microstrips to waveguide transition line. Attractive features including compact size and planar form make this coupler structure easily integrated in antenna beam-forming networks. The coupling is about 7 dB at 9 GHz to 12 GHz frequency, the isolation is below 15dB over the frequency range of 9-12 GHz, and the return loss is better than 15dB. Design considerations and results are discussed and presented. A simulation has been carried out by Ansoft High frequency structure simulator (HFSS).

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“…Microwave directional couplers are key circuit elements for many applications including radars, modern communication systems, and beam forming networks. Rectangular waveguide directional couplers have been extensively investigated in the past because of their low insertion loss and high quality factor. However, the integration of such structures with modern microwave and millimeter‐wave integrated circuits is limited by the requirement for specific, sophisticated, and high accuracy machining.…”

Section: Introductionmentioning

confidence: 99%

Design of a multilayered six‐aperture directional coupler using substrate integrated waveguide

Mbaye

Talbi

Hettak

2013

Micro & Optical Tech Letters

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The design of a six‐aperture, 10‐dB directional coupler using substrate integrated waveguide is presented. Size constraints precluded addition of holes in series, however, in parallel the addition enhanced performance without increasing size. Here, 10‐dB coupling with ±2‐dB coupling ripple and reflection coefficient exceeded that of 15 dB over 34% of bandwidth. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:23–27, 2014

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Design of Cruciform Directional Couplers in E-Plane Rectangular Waveguide

Cited by 15 publications

References 5 publications

Compact 3‐dB waveguide hybrid with full bandwidth

Compact 3‐dB waveguide hybrid with full bandwidth

Wideband Directional Coupler for X-band using SIW Technique

Design of a multilayered six‐aperture directional coupler using substrate integrated waveguide

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