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

fYear

2001

fDate

2001

Firstpage

125

Lastpage

129

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;

fLanguage

English

Publisher

ieee

Conference_Titel

High Frequency Postgraduate Student Colloquium, 2001. 6th IEEE

Conference_Location

Cardiff

Print_ISBN

0-7803-7118-6

Type

conf

DOI

10.1109/HFPSC.2001.962179

Filename

962179