| Full text | |
| Author(s): |
Ferreira, Ivan S.
;
Tello, Camilo
;
Bergano, Miguel
;
Villela, Thyrso
;
Barbosa, Domingos
;
Smoot, George F.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | SPRINGERPLUS; v. 5, DEC 2 2016. |
| Web of Science Citations: | 0 |
| Abstract | |
Background: We describe the design, the construction and performance of a narrow band ortho-mode transducer, currently used in the 5 GHz polarimetric receiver of the Galactic Emission Mapping project. Results: The ortho-mode transducer was designed to achieve a high degree of transmission within the 400 MHz of the GEM band around the 5 GHz (4.8-5.2 GHz). It is composed of a circular-to-square waveguide transition, a septum polarizer, a thin waveguide coupler and a smooth square-to-rectangular waveguide transition with custom waveguide bends to the output ports. Conclusion: Our simulations and measurements show a very low level of cross-polarization of about -60 dB and a good impedance match for all three ports (S11; S22; S33 < -30 dB) with only 0: 25 dB of insertion loss offset across the 400 MHz (4.8-5.2 GHz) of the reception bandwidth. (AU) | |
| FAPESP's process: | 00/06770-2 - The cosmic microwave background radiation (CMBR) and structure formation in the universe |
| Grantee: | Reuven Opher |
| Support Opportunities: | Research Projects - Thematic Grants |