EMSICC-based compact array antenna having switchable frequency beam-scanning range in microstrip environment

Sidelobe level suppression is a major problem in circular array antenna (CAA) synthesis. Many conventional numerical techniques are proposed to achieve this which are time consuming and often fail to handle multimodal problems. In this paper, a method of circular array synthesis using nature inspired flower pollination algorithm (FPA) is proposed. The synthesis technique considered here adapts one and two degrees of freedom, namely, amplitude only and amplitude spacing. The effectiveness of the FPA is studied by comparing the results with genetic algorithm (GA) and uniform circular array antenna (UCAA) with uniform spacing. Also the effect of additional degree of freedom on the aperture size and the computational time is analyzed. A relative side lobe level (SLL) of −25 dB is achieved using the algorithm under both no beam scanning (0°) and beam scanning (15°) conditions for 20 and 40 elements of CAA.

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Compact line source generator for feeding continuous transverse stub arrays

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721001653 ◽

2021 ◽

pp. 1-12

Author(s):

Houtong Qiu ◽

Xue-Xia Yang ◽

Meiling Li ◽

Zixuan Yi

Keyword(s):

Line Source ◽

Cylindrical Wave ◽

Center Frequency ◽

Continuous Beam ◽

Cross Polarization ◽

Beam Scanning ◽

Rotationally Symmetric ◽

Planar Wave ◽

Scanning Range ◽

Polarization Level

Abstract Based on a substrate integrated lens (SIL), a compact line source generator (LSG) for feeding continuous transverse stub (CTS) arrays with linear-polarized (LP) beam scanning and dual-polarized (DP) operations is presented in this paper. The SIL consists of metamaterial cells with different sizes being arranged as concentric annulus and is printed on the center surface of two substrate layers. The SIL can convert the cylindrical wave generated by the feed probe of SIW-horn to the planar wave for feeding the CTS array. This rotationally symmetric SIL can be used conveniently to design LSG for feeding CTS arrays with the continuous beam scanning and DP operations, which has been verified by the fabrications and measurements. By simply rotating the SIW-horn along the edge of SIL, the 10-element LP-CTS array obtains a measured beam scanning range of ±35° with the highest gain of 20.6 dBi. By setting two orthogonal SIW-horns at the edge of the proposed SIL, the nine-element DP-CTS array with orthogonal radiation stubs is excited. The DP array obtains the gain of 20.3 dBi at the center frequency with the isolation of 28 dB and the cross-polarization level <−25 dB.

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Omni-, Sector, and Adaptive Modes of Compact Array Antenna

Networking and Telecommunications ◽

10.4018/978-1-60566-986-1.ch045 ◽

2010 ◽

pp. 716-728

Author(s):

Jun Cheng ◽

Eddy Taillefer ◽

Takashi Ohira

Keyword(s):

Adaptive Control ◽

Control Algorithm ◽

Mobile User ◽

Array Antenna ◽

Single Source ◽

Source Power ◽

Power Maximization ◽

Signal Processing Algorithms ◽

Adaptive Control Algorithm ◽

Compact Array

Three working modes, omni-, sector and adaptive modes, for a compact array antenna are introduced. The compact array antenna is an electronically steerable parasitic array radiator (Espar) antenna, which has only a single-port output, and carries out signal combination in space by electromagnetic mutual coupling among array elements. These features of the antenna significantly reduce its cost, size, complexity, and power consumption, and make it applicable to mobile user terminals. Signal processing algorithms are developed for the antenna. An omnipattern is given by an equal-voltage single-source power maximization algorithm. Six sector patterns are formed by a single-source power maximization algorithm. Adaptive patterns are obtained by a trained adaptive control algorithm and a blind adaptive control algorithm, respectively. The experiments verified the omnipattern, these six sector patterns and the adaptive patterns. It is hope that understanding of the antenna’s working modes will help researcher for a better design and control of array antennas for mobile user terminals.

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A Beam-Scanning Array Antenna for LPWAN Base Station

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting ◽

10.1109/apusncursinrsm.2018.8608881 ◽

2018 ◽

Cited By ~ 1

Author(s):

Phaisan Ngamjanvaporn ◽

Chuwong Phongcharoenpanich ◽

Monai Krairiksh

Keyword(s):

Base Station ◽

Array Antenna ◽

Beam Scanning

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A beam scanning continuous transverse stub array antenna for Ka‐band applications

Microwave and Optical Technology Letters ◽

10.1002/mop.31681 ◽

2018 ◽

Vol 61 (4) ◽

pp. 1097-1103

Author(s):

Weipeng Wang ◽

Qiulin Huang ◽

Zhenxing Liu ◽

Hao Liu ◽

Xiaowei Shi

Keyword(s):

Array Antenna ◽

Beam Scanning ◽

Ka Band

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Wide-Angle Scanning Phased Array Antenna using High Gain Pattern Reconfigurable Antenna Elements

Scientific Reports ◽

10.1038/s41598-019-54120-2 ◽

2019 ◽

Vol 9 (1) ◽

Author(s):

ByungKuon Ahn ◽

In-June Hwang ◽

Kwang-Seok Kim ◽

Soo-Chang Chae ◽

Jong-Won Yu ◽

...

Keyword(s):

Phased Array ◽

High Gain ◽

Array Antenna ◽

Reconfigurable Antenna ◽

Wide Angle ◽

Phased Array Antenna ◽

Design Guideline ◽

Phased Array Antennas ◽

Array Antennas ◽

Scanning Range

AbstractThis paper presents a wide-angle scanning phased array antenna using high gain pattern reconfigurable antenna (PRA) elements. Using PRA elements is an attractive solution for wide-angle scanning phased array antennas because the scanning range can be divided into several subspaces. To achieve the desired scanning performance, some characteristics of the PRA element such as the number of switching modes, tilt angle, and maximum half-power beamwidth (HPBW) are required. We analyzed the required characteristics of the PRA element according to the target scanning range and element spacing, and presented a PRA element design guideline for phased array antennas. In accordance with the guideline, the scanning range was set as ±70° and a high gain PRA element with three reconfigurable patterns was used to compose an 8x1 array antenna with 0.9 λ0 spacing. After analyzing whether the active element patterns meet the guideline, the array antenna was fabricated and measured to demonstrate the scanning performance. The fabricated array can scan its beam from -70° to 70° by dividing the scanning range into three subspaces. It shows that even if the array antenna has large element spacing, the desired scanning performance can be obtained using the elements designed under the guideline.

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