کنفرانس مهندسی برق ایران

صفحه اصلی / بیست و نهمین کنفرانس مهندسی برق ایران

Compact Offset-Beam Four-Layer X-Band Proximity-Coupled Array Antenna in Triangular Grid

نویسندگان :

Hossein Mardani¹ Javad Nourinia² Changiz Ghobadi³ Muhammad Sajjad Ahmad⁴ Bahman Mohammadi⁵

1- School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, Belfast, United Kingdom 2- دانشگاه ارومیه 3- دانشگاه ارومیه 4- School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, Belfast, United Kingdom 5- دانشگاه ارومیه

کلمات کلیدی :

Array antenna, four-layer, proximity-coupled element, triangular grid.

چکیده :

In this paper, a compact four-layer offset-beam X-band triangular grid microstrip array antenna with proximity coupled feed patch element is presented. The feed network is in the lower substrate and the radiation elements are in the upper substrate of the array antenna structure, which are isolated by the ground plane in the middle substrate. The feed network is in parallel planar format and utilizes a 1×4 phase shifter power divider to realize a progressive phase shift needed to control the beam direction. The isolation of the feed network from patch elements reduces cross polarization and side lobe levels (SLLs). The patch antenna elements are excited by proximity coupling which increases bandwidth, flexibility in the impedance matching, and simplicity of fabrication, also reduces spurious response. A triangular arrangement is used to reduce mutual coupling and to limit the grating lobes. Moreover, a 4×4 element array antenna with a fixed scan angle at 30° is designed with 1 GHz impedance bandwidth with a center frequency of 9.5 GHz, peak gain of 15.1 dBi and side lobe level (SLL) less than -10 dB in principle planes. In addition, the proposed power supply network structure enables easy PIN and varactor diode phase shifters, which can be used to improve antenna performance by providing reconfigurable and tunable scanning.