Novel flexible dielectric waveguide for millimeter and sub-millimeter frequencies &amp;#x2014; Design and characterization

Nickel, H.-U.; Zovo, Janno

doi:10.1109/arftg.2014.7013404

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The pattern measurements were conducted by using the flexible waveguide assembly from Spinner [17], which is connected to the turntable. Due to mechanical limitations, only a rotation of ±65 • of the turntable is possible.…”

Section: E Antenna Measurementsmentioning

confidence: 99%

Liquid Crystal Based Dielectric Waveguide Phase Shifters for Phased Arrays at W-Band

et al. 2019

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In this work, the feasibility of microwave liquid crystal based dielectric waveguide phased shifters is investigated in a phased rod antenna array for the first time. For this, a 1 × 4 rod antenna array is designed including the phase shifters as well as a cascaded E-plane power divider network. As core elements, the phase shifter are designed as continuously tunable subwavelength fibers, partially filled with a newly specifically synthesized microwave liquid crystal, exhibiting a maximum FoM 145 • /dB at 102.5 GHz. As proof-of-concept, a simplified electric biasing network is developed, demonstrating its beam steering capability by changing the scanning angle between 0 • , −25 • and +15 • with three different voltage distributions. The antenna array is well matched throughout the complete W-band with a input reflection below −10 dB. The measured antenna gain is between 11.5 to 9.1 dBi at 85 GHz accompanied with a side lobe level between −12 to −7 dB, depending on the steering configuration.INDEX TERMS Phased array, millimeter wave devices, microwave liquid crystal, dielectric waveguide.

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Section: E Antenna Measurementsmentioning

confidence: 99%

Liquid Crystal Based Dielectric Waveguide Phase Shifters for Phased Arrays at W-Band

et al. 2019

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“…Such high losses in the transmitting part lead to a lower dynamic range in the measurements and, hence, low sidelobes may not be detected anymore. An alter native with lower losses is the flexible dielectric waveguide for millimeter and sub-millimeter frequencies presented in [8]. The measured attenuation of such a flexible waveguide with length lWG = 900 mm is 3.0 dB at 110GHz [9].…”

Section: B Acquisition Unitmentioning

confidence: 99%

A volumetric near-field scanner for millimeter-wave antenna measurements

Koenen

Hamberger

Siart

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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Ahstract-A 3-D volumetric near-field scanner for millimeter wave antenna measurements is presented. The error sources from cable flexing, when moving the probe antenna, are in the range of ±O.S o. The probe positioning accuracy is ±O.020 mm. Accurate positioning of' the antenna under test (AUT) is guaranteed by means of fitting holes. A dielectric waveguide provides a flexible connection with low attenuation between the AUT and the millimeter-wave source module. Measurements of a W-band standard gain horn and a reflector antenna are compared with full-wave simulations and yield good agreement.

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“…DWGs offer a lightweight, low loss, cost efficient and easy to fabricate alternative to conventional waveguides. They have been widely utilized at millimeter waves in various devices such as flexible transmission lines [1], [2] or tunable phase shifters [3][4][5][6]. A simple way to realize a dielectric antenna is to taper the DWG at its end, such that a dielectric rod antenna (DRA) is formed [7].…”

Section: Introductionmentioning

confidence: 99%

Fully Dielectric Rod Antenna Arrays with Integrated Power Divider

et al. 2019

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This paper presents an overview of fully dielectric antenna arrays with integrated dielectric power dividers developed at Technische Universität Darmstadt as an extension of previous work. The power dividers are based on the principle of multimode interference and offer one- and two-dimensional power division in a single step, which allows the realization of small and lightweight devices. In order to prove the concept, 1 × 4 and 4 × 4 fully dielectric antenna arrays with integrated power dividers milled from Rexolite are designed, realized and characterized, operating between 90 GHz and 105 GHz. To assess miniaturization and beamsteering capabilities, three 1 × 4 arrays composed of different materials, Rexolite, Preperm L300 and Preperm L440, are compared regarding gain, size, weight and element spacing. Depending on array size and material, gain is between 12.5 dBi and 22 dBi, accompanied with sidelobe levels below - 7.5. All demonstrators are realized by milling, but the designs show the potential to be 3D printed or injection molded for large scale manufacturing.

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Novel flexible dielectric waveguide for millimeter and sub-millimeter frequencies — Design and characterization

Cited by 9 publications

References 2 publications

Liquid Crystal Based Dielectric Waveguide Phase Shifters for Phased Arrays at W-Band

Liquid Crystal Based Dielectric Waveguide Phase Shifters for Phased Arrays at W-Band

A volumetric near-field scanner for millimeter-wave antenna measurements

Fully Dielectric Rod Antenna Arrays with Integrated Power Divider

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