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Miniaturized Low-Cost Phased-Array Antenna Using SIW Slot Elements

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4 Author(s)
Loghmannia, P. ; Electr. Eng. Dept., K.N. Toosi Univ. of Technol., Tehran, Iran ; Kamyab, M. ; Ranjbar Nikkhah, M. ; Rezaiesarlak, R.

In this letter, a miniaturized C-band phased-array antenna based on a novel series-fed network is introduced. The series-fed network, radiating elements, and phase shifters are the main parts of the proposed phased-array antenna. In order to use the identical phase shifters, quarter-wavelength transformers are used in the design of the series-fed network. Furthermore, by choosing the proper place of the quarter-wavelength transformers, the distance between adjacent radiating elements is significantly reduced to 0.33λ0. To reduce mutual couplings between radiating elements, miniaturized negative-order substrate integrated waveguide (SIW) slot antennas are chosen as radiating elements. A low-cost and compact 4-bit composite right/left-handed (CRLH) phase shifter is used due to the capability of being placed in a series-fed network. The proposed low-cost phased-array antenna is fabricated on a single-layer printed circuit board (PCB), and good agreement between the simulation and measurement results is obtained. The beam scanning range is 38°, and the impedance bandwidth of the phased-array antenna is 25 MHz at the center frequency of 5 GHz.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )

Date of Publication:

2012

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