Ainara Rebollo

A broadband radiometer configuration at 94GHz in planar technology

This paper describes a broadband radiometer receiver configuration in planar technology working around 94 GHz. This differential configuration allows reducing gain and noise temperature fluctuations of the amplifiers themselves in a wide bandwidth, which improves the sensitivity of these systems. In addition to this, the studied configuration also allows obtaining as an output a reference signal amplified in the same way that the unknown RF signal. Therefore, the system can be easily calibrated. The different components of the RF front-end of the receiver have been optimized for an operational bandwidth of 80–100 GHz.

Optimization of a Pin Surface as a Solution to Suppress Cavity Modes in a Packaged W-Band Microstrip Receiver

A pin surface structure has been used in the upper metal plate of a packaged W-band RF front-end receiver in order to suppress the propagation of unwanted modes. A full parametric analysis of the periodic structure within the irreducible Brillouin zone has been carried out in order to understand the behavior of the pin surface and determine the optimum dimensions for its operation in the full W-band. Resonances suppression has been demonstrated in the W-band both in simulation and experimentally.

Development of a sub-harmonic mixer working at 220 GHz

This paper describes the design and development of a heterodyne sub-harmonic receptor working at Sub-mm wave frequencies, which in this case it corresponds with 220 GHz. The design has been realized with different electromagnetic programs such as Ansoft HFSS and Ansoft Designer. Along this paper several modifications are going to be studied with the purpose of achieving a good prototype in terms of good adaptation at the OL and RF ports and low noise temperature and conversion loss.