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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE (ENGLISH)   2004 , Volume 15 , Number 3; Page(s) 17 To 23.
 
Paper: 

EFFECT OF TRANSCEIVER INTERMODULATION DISTORTION ON THE PERFORMANCE OF ARRAY ANTENNA PATTERNS

 
 
Author(s):  DADASHZADEH G.*, HAKAK M., JEDARI E., KAMAREEI M.
 
* TARBIAT MODARRES UNIVERSITY
 
Abstract: 

The use of array antennas in mobile telecommunication systems has proven to increase the spectrum efficiency of the system. The use of beamforming techniques poses high linearity demands on both the RF/IF up and down conversion chain. In this paper, an overview of the various nonlinear effects is first presented. By the way amplitude distortion produced in the transmitter up conversion chain and amplification that can affect the antenna beam specification is simulated. Results show that the IMD products increase the level of spurious radiation and ultimately reduce the performance of the beamformer. In the receiving mode, AM-AM conversion due to gain compression of the Low Noise Amplifiers (LNAs) is modeled and the beam pattern degradation is simulated. Using behavioral modeling, a new relation for AM-PM conversion is established as a gain compression. Results show that the amplitude and phase distortion of the LNA vary for different gain setting and over signal bandwidth and indicate the need for regular calibration in using beamforming techniques. Also, results show that the produced radiation pattern is more affected by AM-PM distortion rather than AM-AM distortion.

 
Keyword(s): AM-AM CONVERSION, AMPLITUDE AND PHASE DISTORTION, ARRAY ANTENNA, RF/IF CHAIN, LOW NOISE AMPLIFIER
 
References: 
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