Reduction in Mutual Coupling Characteristics of Slot-Coupled Planar Antenna due to Rectangular Elements

Huiling JIANG  Ryo YAMAGUCHI  Keizo CHO  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.7   pp.2368-2376
Publication Date: 2012/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.2368
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
filter integrated antenna,  base station antenna,  mutual coupling reduction,  broadband antenna,  

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High frequency bands such as the 3-GHz band have received much attention as frequency resources for broadband mobile communication systems. Radio Frequency (RF) integrated antennas are considered to be useful as base station antennas in decreasing the feeding loss that is otherwise inevitable in high frequency bands and they ensure sufficient power for broadband transmission. One problem in actualizing RF integrated antennas is miniaturizing the duplexer, which is generally large, among the RF circuitry components. To downsize the duplexer, we consider separately locating the transmitter (Tx) and receiver (Rx) antennas. To suppress further the mutual coupling between the Tx and Rx antennas, we investigate a filter integrated antenna configuration. In this paper, we consider an aperture coupled patch antenna as the base antenna configuration and propose a new filter integrated antenna that comprises multiple rectangular elements installed between the coupling slot and radiation element of the Rx antenna. The simulation and measurement results confirm that the new antenna reduces the mutual coupling in the transmission frequency band up to 5.7 dB compared to the conventional slot coupled patch antenna configuration.