High-performance cryogenic fractal 180° hybrid power divider with integrated directional coupler

Ladu, A.; Montisci, Giorgio; Valente, G.; Navarrini, A.; Marongiu, P.; Pisanu, T.; Mazzarella, Giuseppe

doi:10.1002/2017rs006292

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…On the other hand, the components of the P-band receiver, cascaded as shown in Fig. 3(a) and operating at a cryogenic temperature of 20 K, are:  A cryogenic 180° hybrid with integrated directional coupler [15]. A planar fractal 180° hybrid configuration has been used to cover the operating bandwidth of the receiver with a significant size reduction, which is mandatory to save space (and refrigerating power) inside the cryostat.…”

Section: B P-band Receiver Cryogenic Rf Pathmentioning

confidence: 99%

The Coaxial L-P Cryogenic Receiver of the Sardinia Radio Telescope

et al. 2022

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The design and characterization of the coaxial dual-band L-P radio astronomical receiver for the prime focus of the Sardinia radio telescope are presented. The main feature of this receiver is to allow simultaneous radio astronomical observations in the P (305 -410 MHz) and L (1.3 -1.8 GHz) frequency bands. This functionality, which has been requested by the Pulsar research group at the National Institute for Astrophysics to estimate, among the others, the ionospheric dispersion in Pulsar observation, is currently missing in any other radio astronomical facility throughout the world. Also, single band operation is ensured by the proposed design both in linear and circular polarization, making this L-P receiver an ideal instrument for a wide range of radio astronomical and space applications. Some components of the receiver chain have been housed inside a cryostat and refrigerated at 20 K to reduce the noise temperature, resulting in a good performance compared to the receivers of other large radio telescopes. Several challenging issues have been faced in the design, mainly due to the large dimension and weight of the overall structure to be mounted in the prime focus position. Moreover, the design of the cryostat was constrained by the limited space available in the direction of the optical axis inside the focal cabin of the radio telescope, requiring a compact and light realization of the components of the receiver chain. This called for a home-made design of several devices, requiring a strong collaborative effort by researchers, engineers, and astronomers.

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Section: B P-band Receiver Cryogenic Rf Pathmentioning

confidence: 99%

The Coaxial L-P Cryogenic Receiver of the Sardinia Radio Telescope

et al. 2022

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“…The receiver of the BIRALET system is the SRT, a 64 m fully steerable wheel-and-track parabolic antenna ( Figure 1) devoted mainly to radio astronomical observations, located in Pranu Sanguini (Northeast from Cagliari), operating in the frequency range from 0.3 to 116 GHz. In addition to the 64 m primary parabolic mirror, the antenna is equipped with a 7.9 m secondary mirror and the beam waveguide system (BWG), which includes two 2.9 m mirrors and one 3.9 m mirror, for a total of four focal positions [16][17][18][19][20]. To better clarify the mirrors and foci configuration of the SRT, a sketch of the antenna is reported in Figure 2, whereas Table 1 summarizes the key features of the radio telescope.…”

Section: The Biralet Systemmentioning

confidence: 99%

Recent Advances of the BIRALET System about Space Debris Detection

et al. 2021

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Space debris is internationally recognized as a planetary threat. Efforts to enhance the worldwide radar monitoring networks have been intensified in the last years. Among the new radars employed for the observations, one of the most promising is the Bistatic Radar for Low Earth Orbit (LEO) Tracking (BIRALET), which employs the Sardinia Radio Telescope as a receiving segment. The Sardinia Radio Telescope (SRT) has recently been proven to be a reliable instrument for space debris monitoring and, for this purpose, over the years has undergone some substantial modifications in order to be able to rise to the status of a fully functional radar receiver. However, an extensive measurement campaign, in order to assess the real potential of the radar, has never been done before. In this paper, the authors present the first real space debris measurement campaign of the SRT, made between December 2018 and October 2019 using the new dedicated channel of the P-band receiver. A total of 27 objects were correctly detected during this campaign, characterized by a radar cross section (RCS) interval between 0.13 and 13.4 m2 and a range interval between 459 and 1224 km.

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“…In full operational mode, the SRT is able to host up to 20 remotely controllable receivers and to observe the sky with high efficiency in the frequency range between 0.3-116 GHz [13]. In order to observe the signal sent from FTS and scattered by the debris, the coaxial dual-feed L-P band (0.305-0.410 GHz, 1.3-1.8 GHz) cryogenic receiver of SRT has been used ( Figure 1) [14][15][16][17]. The features of the transmitter and receiver antennas at 410 MHz are reported in Table 1.…”

Section: Bistatic Radar For Leo Trackingmentioning

confidence: 99%

Space Debris Detection in Low Earth Orbit with the Sardinia Radio Telescope

et al. 2017

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Space debris are orbiting objects that represent a major threat for space operations. The most used countermeasure to face this threat is, by far, collision avoidance, namely the set of maneuvers that allow to avoid a collision with the space debris. Since collision avoidance is tightly related to the knowledge of the debris state (position and speed), the observation of the orbital debris is the key of the problem. In this work a bistatic radar configuration named BIRALET (BIstatic RAdar for LEO Tracking) is used to detect a set of space debris at 410 MHz, using the Sardinia Radio Telescope as the receiver antenna. The signal-to-noise ratio, the Doppler shift and the frequency spectrum for each debris are reported.

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High-performance cryogenic fractal 180° hybrid power divider with integrated directional coupler

Cited by 8 publications

References 19 publications

The Coaxial L-P Cryogenic Receiver of the Sardinia Radio Telescope

The Coaxial L-P Cryogenic Receiver of the Sardinia Radio Telescope

Recent Advances of the BIRALET System about Space Debris Detection

Space Debris Detection in Low Earth Orbit with the Sardinia Radio Telescope

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