3D metal printed Ku/Ka Band modified turnstile junction Orthomode Transducer

Bhutani, Akanksha; Schaefer, J.; Pauli, Mario; Scherr, Steffen; Goettel, Benjamin; Nierlich, Martin; Zwick, Thomas

doi:10.1109/apmc.2016.7931276

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…13. Similar structures were investigated in [26]- [28]. The manufacture of such a structure without seams would be very difficult using conventional manufacturing techniques.…”

Section: Ortho-mode Diplexermentioning

confidence: 99%

Effective Conductivity of Additive-Manufactured Metals for Microwave Feed Components

et al. 2021

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This paper characterizes the effective conductivity of lossy metal materials fabricated with additive manufacturing processes at microwave frequencies using a resonant cavity approach. Specifically addressed is the powder bed fusion additive manufacturing process utilizing AlSi10Mg material at Ku-band. The details of the procedure for converting device parameters that characterize the resonant cavity to material properties are given. Trade-offs between the precision of the conductivity and the quality factor of the cavity are discussed relevant to the design of the cavity. A best-fit matching procedure is made between the measured response of the manufactured cavities and the simulated results. The conductivity with statistical deviation for various fabricated cavities from different vendors is reported. Examples of various designs of fabricated prototype waveguide feed components are presented. The predicted and measured performance of each component is compared, validating the process.

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“…13. Similar structures were investigated in [26]- [28]. The manufacture of such a structure without seams would be very difficult using conventional manufacturing techniques.…”

Section: Ortho-mode Diplexermentioning

confidence: 99%

Effective Conductivity of Additive-Manufactured Metals for Microwave Feed Components

et al. 2021

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“…10-15). Other reports of the OMT and feed mostly have a bandwidth of about 1.5:1-1.8:1 [21][22][23].…”

Section: Test Results and Discussionmentioning

confidence: 99%

Multi‐frequency dual polarisation radiometer common aperture antenna feeding system

Wang

Qiyan

Zhang

et al. 2018

IET Microwaves, Antennas & Propagation

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This study presents a design of a tri‐band dual polarisation common aperture feed horn used for the radiometer. The proposed feeding system is made up of a corrugated horn, an orthomode transducer (OMT) and two pairs of a high‐pass filter (HPF) and a band‐pass filter (BPF). The broadband profiled corrugated horn loaded with teeth (rings) is adopted as the feed of the radiometer. Wideband finline OMT is developed to realise a bandwidth ratio in excess of 2:1. Two different HPFs and BPFs are employed to block and pass waves of different frequencies. The feeding structure is then simulated, fabricated and tested. The measured results show that the radiation patterns possess good symmetry at all three working frequencies of interest (18.7, 23.8 and 37 GHz). Furthermore, the cross‐polarisation levels are below −23 dB and voltage standing‐wave ratios are lower than 1.5 throughout all working bands.

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“…However, these lengths have to be varied in order to make the element work for a circularly polarized reflectarray at 20 GHz, which will unavoidably affect the element performance at 12 GHz. Figure 3a shows to which extent the condition R' 0,xx = −R' 0,yy is lost when l dip,21 = l dip,22 departs from 5 mm, and Figure 3b shows how this departure affects the magnitude of the non-diagonal cross-polar coefficients of the matrix R c in (3). Please note that the larger the departure of the phase difference from −180 • in Figure 3a, the larger the cross-polarization in Figure 3b, which reaches a maximum of −14 dB when l dip,21 = l dip,22 = 6 mm and α rot = 0 • .…”

Section: Reflectarray Elementmentioning

confidence: 99%

“…For satcom-on-the-move (SOTM) applications, there is an increasing interest in developing Kuand Ka-band antennas that share a single aperture. Conventional solutions use bulky parabolic reflector antennas with very complex feeding systems [1][2][3]. Reflectarrays are an interesting alternative to reflector antennas owing to their low profile, light weight, radiation performance versatility, ease of manufacture, etc.…”

Section: Introductionmentioning

confidence: 99%

Design of Ku- and Ka-Band Flat Dual Circular Polarized Reflectarrays by Combining Variable Rotation Technique and Element Size Variation

Florencio

Martinez‐de‐Rioja

et al. 2020

Electronics

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In this work circularly polarized flat reflectarray antennas are designed to work at downlink frequencies in Ku- and Ka-band. The design approach for circular polarization radiation combines both the variable rotation technique (VRT) and the element size variation technique (ESVT). The reflectarray element employed consists of a rotable split ring operating at 12 GHz (Ku-band) that surrounds two orthogonal sets of parallel dipoles of variable size operating at 20 GHz (Ka-band). Rotations of split rings and different sizes of dipoles are exploited as degrees of freedom by VRT and ESVT for designing focused beams dual band dual circular polarized reflectarrays. The split ring can be used to achieve single focused beams for circular polarization by VRT at 12 GHz, and the set of orthogonal dipoles can be used to achieve two focused beams for dual circular polarization by ESVT at 20 GHz. In this way, the reflectarray element has been used to design two flat dual band circularly polarized reflectarrays that generate three pencil beams either in the same direction or in different directions: one pencil beam with right-hand circular polarization (RHCP) at 12 GHz and two pencil beams with both RHCP and left-hand circular polarization (LHCP) at 20 GHz. The designed reflectarrays are carried out under local periodicity assumption by means of in-house electromagnetic software that applies the Method of Moments in the Spectral Domain. Validations of the in-house electromagnetic software show significant CPU time savings with respect to CPU time consumption provided by commercial software of general purpose as CST electromagnetics software. Numerical results of radiation patterns produced by the designed reflectarrays show efficiencies around 65% and a bandwidth of 6% for a main beam cross-polarization discrimination of 25 dB. The numerical results are satisfactorily validated by CST software and a tolerance errors study has been numerically carried out with acceptable results.

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3D metal printed Ku/Ka Band modified turnstile junction Orthomode Transducer

Cited by 11 publications

References 3 publications

Effective Conductivity of Additive-Manufactured Metals for Microwave Feed Components

Effective Conductivity of Additive-Manufactured Metals for Microwave Feed Components

Multi‐frequency dual polarisation radiometer common aperture antenna feeding system

Design of Ku- and Ka-Band Flat Dual Circular Polarized Reflectarrays by Combining Variable Rotation Technique and Element Size Variation

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