Title :
A design of Q-band noise injector
Author :
Tingting Yuan ; Xiaoxing Yin ; Hongxin Zhao ; Jun Shi ; Weiye Zhong ; Qinghui Liu
Author_Institution :
State Key Lab. of Millimeter Waves, Southeast Univ., Nanjing, China
Abstract :
This paper presents a well performance noise injector that is used in the Q-Band (35-50GHz) dual beam cryogenically cooled receiver of Shanghai 65m Radio Telescope. A good flatness of coupling over a wider frequency spectrum is required in the noise injector. The design is based on the traditional circular waveguide directional coupler. The noise injector exhibits a -31.5dB mean coupling, flatness below 3dB, and an excellent cross-polarization below -45dB. The simulated results by using finite-element analysis (Ansys HFSS) are presented.
Keywords :
circular waveguides; directional couplers; finite element analysis; low-temperature techniques; millimetre wave receivers; noise; radiotelescopes; Ansys HFSS; Q-Band dual beam receiver; Q-band noise injector; Shanghai radio telescope; circular waveguide directional coupler; finite element analysis; frequency 35 GHz to 50 GHz; frequency spectrum; size 65 m; Couplings; Directional couplers; Noise; Receivers; Rectangular waveguides; Directional coupler; Multi-hole coupling; Polarization;
Conference_Titel :
Antennas and Propagation (APCAP), 2014 3rd Asia-Pacific Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4799-4355-5
DOI :
10.1109/APCAP.2014.6992719
