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4. Multi-Frequency Passive Remote Sensing of Ice Sheets from L-Band to W-Band

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   Aksoy, Mustafa; Kar, Rahul; Sugumar, Prethiga; Atrey, Pranjal (September 2020, IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium)

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   Multi-frequency microwave radiometer measurements can reveal important subsurface characteristics of ice sheets such as internal temperature, density, grain size and ice thickness, which are critical to understand ice sheet dynamics. This study explores the sensitivity of electromagnetic radiation from ice sheets to these properties across the microwave spectrum, from L-band to W-band. The results indicate that (i) the maximum depth for which surface radiations provide information decreases from >2000 m in L-band to ~3 m in W-band, (ii) seasonal variations in internal temperatures are reflected mostly at frequencies in K a -band and above, (iii) impact of the geothermal heat flux can be observed mainly in L- and S-bands, and (iv) changes in density and grain size properties affect the electromagnetic penetration depth, thus, may influence surface emissions across the entire microwave spectrum. 

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5. Wide‐band signal‐interference duplexer with contiguous single/dual‐band channels and its application to quasi‐absorptive bandpass filters

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   Gómez‐García, Roberto; Muñoz‐Ferreras, José‐María; Feng, Wenjie; Psychogiou, Dimitra (May 2018, Electronics Letters)

   A type of wide‐band signal‐interference planar duplexer with single‐ and dual‐band channels is presented. It exploits transversal‐signal‐interference‐section‐based channels with contiguous single‐ and dual‐passband filtering transfer functions. Furthermore, by ending the dual‐band channel in a reference‐impedance resistor, a wide‐band bandpass filter (BPF) with quasi‐absorptive stopbands is realised. As experimental validation, microstrip prototypes of a duplexer and a two‐stage quasi‐absorptive BPF that operate in the 1.6–4.4 GHz range are built and tested. 

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