Title :
Low noise integrated active antenna as image reject mixer (IRM)
Author :
Ismail, Widad ; Gardner, Peter
Author_Institution :
Dept. of Electron, Electr. & Comput. Eng., Univ. of Birmingham, UK
Abstract :
A patch antenna integrated with two Low Noise Amplifiers (LNA) is implemented to act as an Image Reject Mixer (IRM). The low noise active antenna system transforms a received radio frequency signal into two signals, which are out-of phase to each other. The image signals can be cancelled by the IRM. The antenna, LNA´s, mixers and local oscillator (LO) are integrated into a single Active Integrated Antenna (AIA) module. An external IF 90° hybrid coupler is required in the IRM. The advantages of the LNA active antenna mixer system are low noise, image signal rejection, low cost and simple circuitry of front-end, and improved receiver sensitivity
Keywords :
active antennas; microstrip antennas; mixers (circuits); receiving antennas; IF hybrid coupler; front-end circuit; image reject mixer; local oscillator; low noise amplifier; low noise integrated active antenna; patch antenna; radiofrequency signal; receiver sensitivity; Active noise reduction; Local oscillators; Low-noise amplifiers; Noise cancellation; Patch antennas; Phase noise; RF signals; Radio frequency; Radiofrequency amplifiers; Receiving antennas;
Conference_Titel :
High Frequency Postgraduate Student Colloquium, 2001. 6th IEEE
Conference_Location :
Cardiff
Print_ISBN :
0-7803-7118-6
DOI :
10.1109/HFPSC.2001.962179
