Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 2002 | public
Journal Article

A 24-GHz Patch Array with a Power Amplifier/Low-Noise Amplifier MMIC


This paper presents an active patch array designed at 24 GHz. It can be used as a front-end component for a phased array. A series resonant array structure is chosen which is compact and easy excite. With 5 elements, the array proved a 12-dB antenna gain. A power amplifier and a low noise amplifier are designed on a single GaAs chip (PALNA). Bias switch is used in the PALNA, which greatly reduces the switch loss in a transceiver and increases the efficiency. 20-dB small signal gain is achieved in both power amplifier and low noise amplifier. The active patch array is built by the combination of the patch array and PALNA. The measured active gain of this antenna is 35-dB for the PA mode and 31-dB for the LNA mode. This active patch array can obtain an EIRP of 34 dBm with a total radiated power of 22dBm and a maximum PAE of 32%. To check the noise performance, we applied sources at both normal temperature and 77K (liquid nitrogen) and extracted the noise figure (3.5 dB) of the active antenna by the Y factor method. The results proved that the active antenna is working efficiently as both a transmitting and receiving antenna.

Additional Information

© 2002 Plenum Publishing Corporation. Received February 10, 2002. We appreciate the support of the Lee Center for Advanced Networking at Caltech and the National Science Foundation. The authors also want to thank Chun-Tung Cheung, Ichiro Aoki and Scott Kee for valuable discussion and help in the measurement.

Additional details

August 21, 2023
October 18, 2023