Compact broadband transition from double-ridge waveguide to coaxial line

In this study, a broadband and high gain dielectric‐rod end‐fire antenna are proposed for applications on both the K and Ka bands. By employing the double‐ridged waveguide (DRW) feeding structure which is composed of a coaxial line to tapered DRW transition, a parabolic tapered DRW, and a parabolic‐tapered flared parallel waveguide section, the impedance bandwidth of this proposed antenna is broadened to 84.5%. The dielectric‐rod with the double circular truncated cone structure acted as the main radiator of the proposed antenna is adopted to achieve higher gains and lower side‐lobe levels as compared to the traditional circular cone dielectric‐rod, while the four‐wedges structure inserted in the waveguide is developed as the matching section of the dielectric‐rod to further improve the impedance matching. The measured results show that this antenna can be operated in 17.9–44.1 GHz, and the measured gain changes from 9.9 to 15.5 dBi. Moreover, the radiation patterns are demonstrated with observed end‐fire characteristic in the overall operating band.

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“…We design a compact in-line coaxial line to tapered DRW transition as shown in Fig. 2, which is inspired by [27,28]. This transition is comprised…”

Section: Feeding Structurementioning

confidence: 99%

Broadband and high gain dielectric‐rod end‐fire antenna fed by a tapered ridge waveguide for K/Ka bands applications

Zhang

Lin

Zhu

et al. 2020

IET Microwaves, Antennas & Propagation

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“…It must be capable of launching the dominant mode of the doubleridged waveguide with minimal coupling to higher order modes Manuscript while presenting a near-constant impedance to the input port over the desired frequency range, in this case a 1-mm coaxial connector [11]. This is a challenging design problem in its own right and has received a great deal of attention in the published literature [12]- [14]. First, one must select waveguide dimensions.…”

Section: Coax To Double-ridged Waveguide Launchermentioning

confidence: 99%

A 10–100-GHz Double-Ridged Horn Antenna and Coax Launcher

Morgan

Boyd

2015

IEEE Trans. Antennas Propagat.

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The design, fabrication, and measurement of a coax to double-ridged waveguide launcher and horn antenna is presented. The novel launcher design employs two symmetric field probes across the ridge gap to minimize spreading inductance in the transition, and achieves better than 15 dB return loss over a 10:1 bandwidth. The aperture-matched horn uses a halfcosine transition into a linear taper for the outer waveguide dimensions and ridge width, and a power-law scaled gap to realize monotonically varying cutoff frequencies, thus avoiding the appearance of trapped mode resonances. It achieves a nearly constant beamwidth in both E-and H-planes for an overall directivity of about 16.5 dB from 10-100 GHz.

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“…Mode conversion and broadband impedance matching are provided through a tapered rectangular coaxial line located between the connector and the ridge waveguide. A coaxial-to-double ridge waveguide transition is examined in [2], where wideband performance is obtained thanks to a four-step quarter-wave Chebyshev impedance transformer. For both the devices, low reflection coefficient and negligible insertion loss over wide frequency ranges are exhibited though the optimisation of several geometrical parameters is required.…”

mentioning

confidence: 99%

X‐band right‐angle coaxial‐to‐single ridge waveguide compact transition with capacitive coupling

2019

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A novel right-angle coaxial-to-single ridge waveguide transition with capacitive coupling is presented at X band. Contrarily to the state of the art, the coaxial inner conductor is not in DC contact with the ridge, and such a feature can be a considerable mechanical advantage in the manufacturing of high-performance systems. In addition to this, few geometrical parameters need to be optimised, thus simplifying the overall design with respect to traditional counterparts. Nevertheless, the whole X band can be potentially covered with a return loss better than 20 dB. An ultra-compact transition is designed, manufactured with stereolithography technology and tested in a back-to-back configuration. Good agreement between simulated and measured results is observed for a proof-of-concept prototype.

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Compact broadband transition from double-ridge waveguide to coaxial line

Cited by 16 publications

References 1 publication

Broadband and high gain dielectric‐rod end‐fire antenna fed by a tapered ridge waveguide for K/Ka bands applications

Broadband and high gain dielectric‐rod end‐fire antenna fed by a tapered ridge waveguide for K/Ka bands applications

A 10–100-GHz Double-Ridged Horn Antenna and Coax Launcher

X‐band right‐angle coaxial‐to‐single ridge waveguide compact transition with capacitive coupling

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