CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Superconducting 4-8-GHz Hybrid Assembly for 2SB Cryogenic THz Receivers

Hawal Rashid (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Denis Meledin (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Vincent Desmaris (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Alexey Pavolotsky (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; Victor Belitsky (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling)
Ieee Transactions on Terahertz Science and Technology (2156-342X). Vol. 4 (2014), 2, p. 193-200.
[Artikel, refereegranskad vetenskaplig]

We present here the design and characterization of an intermediate frequency (IF) assembly comprising a compact 90 hybrid chip (coupled line coupler - Lange coupler- coupled line coupler), two bias-T circuits for biasing the superconductor-insulator-superconductor (SIS) mixers, and two transmission-line circuits. Specifically, the miniaturized three-section hybrid chip fabricated using thin-film technology utilizes superconducting Niobium (Nb) transmission lines, air bridges to connect the fingers of the Lange coupler (middle section), and is complemented with two bias-T circuits with integrated MIM capacitors. The assembly was designed to ensure amplitude and phase imbalances better than 0.6 dB and +/- 2 degrees, respectively. Experimental verification of the assembly at 4 K shows good agreement between the measurements and simulations with amplitude imbalance of 0.5 dB and maximum phase imbalance of +/- 2 degrees. The ALMA band-5 (163-211 GHz) receiver will include such assembly. The receiver tests shows sideband rejection ratio better than 15 dB over the entire RF band, i.e., a systematic improvement of 3-9 dB as compared with the previously reported results.

Nyckelord: Directional coupler, microwave components, superconducting devices, thin-film circuits, 2SB receiver, DIRECTIONAL COUPLERS



Denna post skapades 2014-04-17. Senast ändrad 2015-11-13.
CPL Pubid: 196902

 

Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling (2010-2017)

Ämnesområden

Optisk fysik

Chalmers infrastruktur