Title :
On the improvement of the signal-to-noise ratio in systems receiving circular waves
Author :
Laute, Andreas ; Blau, Kurt
Author_Institution :
Fakultat fur Elektrotechnik und Inf., Tech. Univ. Ilmenau, Germany
fDate :
2/1/1994 12:00:00 AM
Abstract :
A module realizing the polarization discrimination in the intermediate frequency (i.f.)-section of a microwave system receiving circular waves is presented. The conditions the two-channel system has to provide in order to receive left-handed and right-handed polarized waves simultaneously and to realize the discrimination in the i.f.-section are discussed. The theoretical analysis leads to the result that an i.f-discriminator shows a signal-to-noise ratio of about 3 dB higher than the established radio frequency (r.f.)-discriminator. The measured data using a test microstrip circuit are compared with theory, with good agreement
Keywords :
discriminators; electromagnetic wave polarisation; microstrip components; microwave integrated circuits; microwave links; radio receivers; radiofrequency interference; IF section; S/N ratio; SNR; circular waves; discrimination; intermediate frequency section; left-handed polarized waves; microstrip circuit; microwave receiving system; polarization discrimination; right-handed polarized waves; signal-to-noise ratio; two-channel system; Circuit testing; Electromagnetic coupling; Electromagnetic wave polarization; Equations; Frequency; Niobium; Probes; Receivers; Signal analysis; Signal to noise ratio;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
