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  • 1
    Online Resource
    Online Resource
    Wideband out‐of‐phase power divider using microstrip to slotline transitions, coupled lines, and shunt open‐ended stubs
    Wiley ; 2015
    In:  Microwave and Optical Technology Letters Vol. 57, No. 9 ( 2015-09), p. 2216-2218
    Details
    In: Microwave and Optical Technology Letters, Wiley, Vol. 57, No. 9 ( 2015-09), p. 2216-2218
    Abstract: The design of a planar out‐of‐phase power divider with broadband behavior is presented. The proposed device uses broadside coupled microstrip‐slotline‐microstrip transitions at the input port and coupled microstrip lines with shunt open‐ended stubs at the output ports to extend the impedance matching bandwidth at three ports of the device. Moreover, a dumbbell‐shaped slot is located underneath the coupled lines and shunted with a proper chip resistor to improve the isolation between the output ports. The utilized structure is suitable for single layer integration as both the input and output ports are located at the same layer. Following a proper theoretical method based on the even‐odd mode approach and slotline design guidelines, a prototype of the presented device aiming to operate across the band 1–3 GHz is designed, built, and tested. The developed device has overall dimensions of 30 mm × 60 mm using the substrate Rogers RO4003 (dielectric constant = 3.38 and thickness = 0.406 mm). While the device can be used for any wideband application, the developed prototype is designed to operate within the band 1–3 GHz, which is used in most microwave‐based medical imaging applications. The achieved simulated and experimental results show 100% fractional bandwidth (1.1–3.3 GHz) assuming 15 dB of isolation as the reference. The proposed device has equal power division between the two output ports with less than 0.2 dB amplitude imbalance. Moreover, the phase difference between the signals at the two output ports is 180° ± 1° across the frequency band 1–3.5 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2216–2218, 2015
    Type of Medium: Online Resource
    ISSN: 0895-2477 , 1098-2760
    URL: Issue
    URL: Article
    DOI: 10.1002/mop.v57.9
    DOI: 10.1002/mop.29296
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2000574-X
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  • 2
    Online Resource
    Online Resource
    Design of wideband single‐layer in‐phase power divider using microstrip to slotline coupled structure
    Wiley ; 2015
    In:  Microwave and Optical Technology Letters Vol. 57, No. 4 ( 2015-04), p. 789-791
    Details
    In: Microwave and Optical Technology Letters, Wiley, Vol. 57, No. 4 ( 2015-04), p. 789-791
    Abstract: The design of a planar in‐phase power divider for wideband applications is presented. The proposed divider uses a broadside coupled microstrip/slotline configuration with an improved isolation between the output ports using suitable isolation resistor. The proposed design is suitable for single layer integration as both the input and output ports are located at the same layer. Although the device can be used for any wideband application, the developed prototype is designed to operate within the band 2–5 GHz, which is used in microwave‐based head imaging systems. The simulated and experimental results of the developed divider show equal power division with less than 0.5 dB of additional insertion loss, less than 2° of phase imbalance, more than 13 dB of isolation and more than 10 dB of return loss over the band 2.3–4.7 GHz. It has a compact size with an overall dimension of 30 × 30 mm 2 . © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:789–791, 2015
    Type of Medium: Online Resource
    ISSN: 0895-2477 , 1098-2760
    URL: Issue
    URL: Article
    DOI: 10.1002/mop.v57.4
    DOI: 10.1002/mop.28959
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2000574-X
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  • 3
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    Online Resource
    EMU/GAMA: A Technique for Detecting Active Galactic Nuclei in Low Mass Systems
    Cambridge University Press (CUP) ; 2024
    In:  Publications of the Astronomical Society of Australia
    Details
    In: Publications of the Astronomical Society of Australia, Cambridge University Press (CUP)
    Abstract: We propose a new method for identifying active galactic nuclei (AGN) in low mass (M * ≤ 10 10 M ⊙ ) galaxies. This method relies on spectral energy distribution (SED) fitting to identify galaxies whose radio flux density has an excess over that expected from star formation alone. Combining data in the Galaxy and Mass Assembly (GAMA) G23 region from GAMA, Evolutionary Map of the Universe (EMU) early science observations, andWide-field Infrared Survey Explorer (WISE), we compare this technique with a selection of different AGN diagnostics to explore the similarities and differences in AGN classification. We find that diagnostics based on optical and near-infrared criteria (the standard BPT diagram, the WISE colour criterion, and the mass-excitation, or MEx diagram) tend to favour detection of AGN in high mass, high luminosity systems, while the “P ro S pect ” SED fitting tool can identify AGN efficiently in low mass systems. We investigate an explanation for this result in the context of proportionally lower mass black holes in lower mass galaxies compared to higher mass galaxies and differing proportions of emission from AGN and star formation dominating the light at optical and infrared wavelengths as a function of galaxy stellar mass. We conclude that SED-derived AGN classification is an efficient approach to identify low mass hosts with low radio luminosity AGN.
    Type of Medium: Online Resource
    ISSN: 1323-3580 , 1448-6083
    URL: Article
    DOI: 10.1017/pasa.2024.9
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2024
    detail.hit.zdb_id: 2560489-2
    detail.hit.zdb_id: 2079225-6
    SSG: 16,12
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