| 1. |
- Buck, David, et al.
(författare)
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Measuring Array Mutual Impedances Using Embedded Element Patterns
- 2023
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 71:1, s. 606-611
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Tidskriftsartikel (refereegranskat)abstract
- The radiation pattern of an antenna element embedded in a multiport antenna such as a phased array depends on the loads connected to the array element ports. If the embedded element patterns are measured using at least two known loading conditions, the patterns can be used to determine the array mutual impedance matrix. In previous work, this result has been derived with the simplifying assumption that the impedance of the source connected to the driven element changes along with the load impedances connected to the nondriven elements. In a practical test configuration, the source impedance cannot be readily changed. We analyze the case of EEPs measured with a fixed source impedance and changing impedances on the nondriven elements. The transformation from one set of EEPs to another with fixed source impedance is more complex than in the case of a source impedance that changes with the load impedances. The transformation depends on the coupling between elements and is only weakly sensitive to the element self-impedances. With measured EEPs for an array of identical elements, the impedance matrix can be found up to a scale factor. We demonstrate the method experimentally by measuring the patterns of an antenna array terminated with one loading condition and repeating the pattern measurements with a different loading condition. The mutual impedance matrix extracted from the pattern measurements compared to network analyzer mutual impedance measurements is accurate to within 1–2 Ω for most of the mutual impedances.
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| 2. |
- Warnick, K. F., et al.
(författare)
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Array Mutual Impedances Can Be Determined from Antenna Range Pattern Measurements
- 2023
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Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. ; 2023-July, s. 767-768
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Konferensbidrag (refereegranskat)abstract
- The relationship between array radiation patterns and mutual coupling can be used to determine mutual impedances from measured embedded element patterns (EEPs). We review the EEP loading condition transformations that form the basis of the method and validate the proposed technique experimentally.
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| 3. |
- Valencia, Sandra, 1981, et al.
(författare)
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Adapting the Sustainable Development Goals and the New Urban Agenda to the city level : Initial reflections from a comparative research project
- 2019
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Ingår i: International Journal of Urban Sustainable Development. - : Taylor & Francis. - 1946-3138 .- 1946-3146. ; 11:1, s. 4-23
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Tidskriftsartikel (refereegranskat)abstract
- The Sustainable Development Goals and the New Urban Agenda recognise the role of cities in achieving sustainable development. However, these agendas were agreed and signed by national governments and thus implementing them at the local level requires a process of adaptation or localisation. In this paper, we analyse five aspects that practitioners and researchers need to consider when localising them: (1) delimitation of the urban boundary; (2) integrated governance; (3) actors; (4) synergies and trade-offs and (5) indicators. These considerations are interrelated, and while not exhaustive, provide an important initial step for reflection on the challenges and opportunities of working with these global agendas at the local level. The paper draws on the inception phase of an international comparative transdisciplinary research project in seven cities on four continents: Buenos Aires (Argentina), Cape Town (South Africa), Gothenburg (Sweden), Kisumu (Kenya), Malmo (Sweden), Sheffield (UK) and Shimla (India).
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| 4. |
- Valencia, Sandra, 1981, et al.
(författare)
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Urban Climate Resilience and Its Link to Global Sustainability Agendas
- 2022
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Ingår i: The Palgrave Handbook of Climate Resilient Societies: Volumes 1-2. - Cham : Springer International Publishing. ; , s. 1807-1834
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter examines urban climate resilience. It provides a conceptual introduction, followed by an explanation of how urban areas have been recognized in recent global agendas related to sustainability, climate change, and disaster risk reduction. The chapter provides a picture of the complexity and diversity of urban climate resilience experiences, through seven case study cities on four continents. The sample of cities includes small, medium, and larger cities, both coastal and landlocked, in diverse political, socioeconomic, and geographical contexts. Drawing on comparative research using co-production between academic researchers and local authority counterparts, the detailed case studies illustrate the climate resilience challenges faced by each city, the work in terms of strategies and initiatives they have carried out and are planning to increase their resilience, as well as the geographical and policy contexts in which those strategies are embedded.
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