Beam-reconfigurable crescent array antenna with AMC plane

Abstract

A beam‐reconfigurable crescent array antenna with AMC plane is presented for application at 9.41 GHz. The unit cell of the AMC plane is modeled based on a square patch integrated with rectangular ring slot with mirrored C‐shaped structures, placed between two layers of Taconic TLY‐5 substrate and located near to the main radiating element. The presented AMC design is achieved an operating bandwidth of 2.82 GHz (30%) with a center frequency of 9.41 GHz. It is found that the AMC plane can reduce the thickness of the structure in comparison to the use of a conventional ground plane, which leads to the overall compactness size of the proposed antenna of 1.1λ × 2.57λ. Moreover, through the implementation of 12 × 4 AMC unit cell, the proposed antenna improved its performance with a maximum gain and total efficiency of 10.5 dB and 97%, respectively. Meanwhile, the antenna reconfigurability is realized by integrating RF MEMS switches on its right and left arm symmetrically. The presence of a T‐shaped Yagi‐Uda‐like parasitic further widened the beam steering angle to ±63° via mutual coupling. The obtained results demonstrate a good agreement between the simulation and measurement and have a huge potential for development of X‐band radar.

A Wide-Angle Scanning Planar Array Based on Four-Mode Pattern-Reconfigurable Elements

“…In various applications, such as advanced military and commercial technology, the array antenna is often used owing to its high scanning speed and precision [1][2][3][4]. Several wideangle beam scanning links to phased arrays have been implemented for radar applications, and various kinds of reconfigurable antenna elements for the array have been proposed to improve scanning range and performance [5][6][7][8][9].…”

Frequency and bandwidth tunable reliable MEMS bandpass filter for 24 GHz radar applications

“…3 In addition, metamaterial based wide bandwidth bandpass filters have already attracted considerable attention. 4,5 Several prior works can be found in the literature on bandpass filters utilizing silicon, [15][16][17][18][19][20][21][22][23][24][25][26][27][28] GaAs, [29][30][31] LTCC, 32,33 and MEMS [6][7][8][9][10][11][12][13][14][34][35][36][37][38][39][40][41][42][43][44] technologies. However, due to the larger fabrication tolerances of the LTCC process, it is not quite suitable for the mass production of these circuits at millimeter-wave frequencies.…”

“…MEMS offer attractive capability for RF systems, particularly in respect of switching, with variable capacitance and inductance tuning functionalities. [6][7][8]42,43 Moreover, MEMS switches were extensively used in tunable filter applications. 44 In addition, the semiconductor IC process is capable of integrating multiple functional blocks in a single chip to achieve circuit size and cost minimization.…”

An artificial magnetic conductor loaded, polarization reconfigurable circular patch array antenna

“…To overcome this disadvantage, an artificial magnetic conductor (AMC) 22 is used to reduce the height of air gap. What is more, AMC also improves bandwidth and gain 23‐25 …”