Superconducting microstrip wide band filter for radio astronomy

2003 ◽  
Author(s):  
Yuanzhi Li ◽  
M.J. Lancaster ◽  
F. Huang ◽  
N. Roddis
Keyword(s):  
Radio Astronomy ◽  
Wide Band ◽  
Band Filter

scholarly journals A Wide-Band, Active Antenna System for Long Wavelength Radio Astronomy

2012 ◽  
Vol 124 (920) ◽  
pp. 1090-1104 ◽  
Author(s):  
Brian C. Hicks ◽  
Nagini Paravastu-Dalal ◽  
Kenneth P. Stewart ◽  
William C. Erickson ◽  
Paul S. Ray ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Wide Band ◽  
Antenna System ◽  
Active Antenna ◽  
Long Wavelength

scholarly journals Fixed and Mobile RFI Search Facilities at Medicina

2001 ◽  
Vol 196 ◽  
pp. 297-300 ◽  
Author(s):  
S. Montebugnoli ◽  
G. Tomassetti ◽  
C. Bortolotti ◽  
M. Roma
Keyword(s):  
Complex System ◽  
Radio Astronomy ◽  
Wide Band ◽  
Low Noise ◽  
Continuous Mode ◽  
Mobile System ◽  
Receiver System

Fixed and mobile RFI search facilities at the Medicina radio astronomy station are described. A complex system of wide-band antennas that can be steered, has been designed and installed on the top of a 25-m high tower and connected with a wide-band sweeping receiver system. At present it works from 0.08 GHz up to 2.5 GHz in continuous mode. Low-noise front ends are used in the radio astronomy bands. A mobile system, equipped with a similar receiving system, has been designed to facilitate the interfering transmitter's position localization.

Development of miniature HTSC wide-band filter with open-loop resonators

2008 ◽  
Vol 53 (9) ◽  
pp. 1300-1303 ◽  
Author(s):  
TianLiang Zhang ◽  
Kai Yang ◽  
JunSong Ning ◽  
ShiRong Bu ◽  
JuanXiu Liu ◽  
...  
Keyword(s):  
Wide Band ◽  
Open Loop ◽  
Band Filter

Fabrication of single crystalline LiNbO3 thin films for wideband bulk acoustic wave filters

2020 ◽  
Vol 10 (9) ◽  
pp. 1504-1510
Author(s):  
Ying Xing ◽  
Yao Shuai ◽  
Xiaoxue Wang ◽  
Lu Lv ◽  
Xiaoyuan Bai ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Acoustic Wave ◽  
Ion Irradiation ◽  
Wide Band ◽  
Bulk Acoustic Wave ◽  
Single Crystalline ◽  
Band Filter ◽  
Wave Filters ◽  
Baw Filter

Single crystalline lithium niobate (LN) thin films with a Y43-cut are fabricated by crystal-ion-slicing technique, and the B-staged benzocyclobutene (BCB) polymer is used as the bonding medium for the transferring of the LN thin film on to a homogeneous LN substrate. The thickness of the LN film is about 910 nm, and low energy ion irradiation is used to treat the surface of the film, which reduces the roughness from 12.4 nm down to 3.6 nm. Bulk acoustic wave (BAW) resonator is fabricated based on the thin LN layer, and the electromechanical coefficient (k2t) of the LN film reaches 16.3%. A 3-stage BAW filter is obtained, and the 3 dB bandwidth of the filter is 8.5%, demonstrating the single crystalline LN thin film with large k2t is promising for wide band filter.

scholarly journals SArdinia Roach2-based Digital Architecture for Radio Astronomy (SARDARA)

2018 ◽  
Vol 07 (01) ◽  
pp. 1850004 ◽  
Author(s):  
A. Melis ◽  
R. Concu ◽  
A. Trois ◽  
A. Possenti ◽  
A. Bocchinu ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Radio Astronomy ◽  
Wide Band ◽  
General Purpose ◽  
Science Program ◽  
Technical Design ◽  
Digital Architecture ◽  
Digital Platform

The Sardinia Radio Telescope (SRT) is a 64-m, fully-steerable single-dish radio telescope that was recently commissioned both technically and scientifically with regard to the basic observing modes. In order to improve the scientific capability and cover all the requirements for an advanced single-dish radio telescope, we developed the SArdinia Roach2-based Digital Architecture for Radio Astronomy (SARDARA), a wide-band, multi-feed, general-purpose, and reconfigurable digital platform, whose preliminary setup was used in the early science program of the SRT in 2016. In this paper, we describe the backend both in terms of its scientific motivation and technical design, how it has been interfaced with the telescope environment during its development and, finally, its scientific commissioning in different observing modes with single-feed receivers.

A compact wide band filter based on the left handed material theory

2008 ◽  
Vol 85 (10) ◽  
pp. 2183-2186 ◽  
Author(s):  
C. Huang ◽  
D. Chen ◽  
W.J. Wei ◽  
X.M. Jing ◽  
X. Chen ◽  
...  
Keyword(s):  
Wide Band ◽  
Left Handed ◽  
Band Filter ◽  
Material Theory

scholarly journals A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

2017 ◽  
Vol 7 (4) ◽  
pp. 1786-1790
Author(s):  
M. Abdul-Niby ◽  
M. Farhat ◽  
M. Nahas ◽  
Μ. Μ. Alomari
Keyword(s):  
Degrees Of Freedom ◽  
Bandpass Filter ◽  
Wide Band ◽  
Open Loop ◽  
Dual Band ◽  
Center Frequency ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Band Filter ◽  
Loop Ring

This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and bandwidth of the three passbands independently. In addition, the six transmission zeros created around the passbands results in a tri-band filter with high selectivity, sharp 3 dB cut-off frequency, high isolation, low passband insertion-loss and high out-of-band harmonic rejection across an ultra-broadband frequency range up to 17 GHz. The proposed technique has the ability to switch from triple to dual band by removing one pair of the inner resonators. Design methodology and simulation results of the filter are provided.

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