A Wideband Beam-Steerable Slot Antenna Using Artificial Magnetic Conductors With Simple Structure

Cao, Yun Fei; Zhang, Xiu Yin

doi:10.1109/tap.2018.2804480

Cited by 54 publications

(20 citation statements)

References 28 publications

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“…This means that an antenna could be placed very close to the surface without shorting it out. The reflection phase, as a function of the surface position, is illustrated in (15). The previous equation states that the phase of the reflected electromagnetic wave and, thus, the steering of the beam can be controlled by changing the impedance of the surface, in other words, it can be controlled by a phase gradient, in botĥ x andŷ directions [4].…”

Section: Beam Steering Analysismentioning

confidence: 99%

“…Three of the most relevant include [14], where the authors employ an AMC as ground plane for a bowtie antenna with re-configuration capabilities to generate a beam steering in the H-plane. In [15], the authors propose to steer the radiation pattern of a slot antenna using an AMC as reflecting surface. The slot antenna has reconfiguration capabilities due to a Pin Diode, which redirects the currents in the antenna.…”

Section: Introductionmentioning

confidence: 99%

“…Another draw back of this work is the high cost. Unlike the method presented in [14] and [15], this contribution generates beam steering by changing the properties of the AAMC, while our technique is cheaper to implement than [16].…”

Section: Introductionmentioning

confidence: 99%

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Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

2020

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An Active Artificial Magnetic Conductor (AAMC) is presented to steer the radiation pattern of a printed dipole working at 2 GHz. The elements that generates the phase shift are a set of Varactor Diodes, which are characterized using its spice model in order to obtain a phase shift-capacitance mapping. Overall beam steering of +/-40 • with a step size of 10 • is achieved. A circuit model that describes any multilayer substrate AAMC unit cell, which uses fist form of Foster's theorem along with transmission line theory, is proposed. Our work is suitable to be used as low profile antenna; for example, street furniture antennas, which are located on the facades of houses or buildings, so that they can be visually mixed up with signs or advertisements. Simulations have been validated using a prototype consisting of an array of 22x14 AAMC elements; the overall structure measures 1.9λ 0 x1.21λ 0. This reflector will generate a phase gradient in its columns, which will modify the reflection angle of an incident electromagnetic wave in the H-Plane. Beam switching control has been achieved using suitably amplified LPF PWM signals generated by two Arduino modules. A printed dipole with a Fractional Bandwidth of 17% is designed and manufactured to illuminate the structure at a distance λ 0 /4 above the surface. Far-field radiation patterns and reflection coefficients have been measured in an anechoic chamber using a spherical system. These compare favorably with simulations performed using the Time Domain solver in CST Microwave Studio.

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Section: Beam Steering Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

2020

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“…As for beam steerable antennas with HIS structures, there are two categories. One type is reconfigurable radiators with fixed HIS structure [14]- [16]. In [14] and [15], taking advantage of HIS with the transverse electric (TE) surface waves, a wide beam steerable antenna was realized.…”

Section: Introductionmentioning

confidence: 99%

“…In [14] and [15], taking advantage of HIS with the transverse electric (TE) surface waves, a wide beam steerable antenna was realized. In [16], by controlling the reflection phase of HIS structure within the range of -45° to +45°, the gain was improved and the back lobe was reduced. The other type is reconfigurable HIS structure [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Beam Steerable Antenna Employing Tunable High Impedance Surface With Liquid Crystal

2020

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A novel beam steerable antenna employing tunable high impedance surface with liquid crystal is proposed. This antenna utilizes three microstrip patches as the radiators and a tunable high impedance surface based on liquid crystal as the ground plane. In this design, liquid crystal is deliberately disposed under the two parasitic microstrip patches to reduce the effect of relatively large dielectric loss and to improve the gain and radiation efficiency of the antenna. More importantly, this work explores a tunable high impedance surface based on liquid crystal, which has advantages of simple structure and biasing scheme as compared with other tunable high impedance surfaces based on solid-state devices. It is shown that by tuning the permittivity of liquid crystal, the high impedance surface becomes to support the propagation of TE surface waves to strengthen the mutual coupling between main and parasitic microstrip patches. Consequently, the main lobe can be steered to the desired direction and the scanning range of the antenna is enlarged. To prove this novel concept, a Ka-band prototype is fabricated and tested. Measured results show that the antenna not only has acceptable gain, but also keeps a satisfactory scanning range. In addition, this antenna consumes negligible DC power and thus is a strong antenna competitor for 5G access point applications.

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A low profile wideband pattern reconfigurable metasurface antenna

Cai

Wang

et al. 2021

Int J RF Mic Comp-Aid Eng

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A low profile electrically controlled pattern reconfigurable antenna with wide bandwidth is proposed in this article. The antenna is designed on two closely stacked substrates with a very low profile of 0.04λ0. On the top layer of the design is a periodic metasurface and two parasitic strips, and on the bottom layer is a metallic ground etched with rectangle slot. The feed line is designed on the middle layer to excite the metasurface patch antenna. Eight pin diodes are mounted between the parasitic metallic strips and the adjacent metallic metasurface patch cells for pattern reconfiguration. Two DC biasing voltages are employed to control the pin diodes. By changing the DC voltages, antenna can work at three different modes, and the main beam could be steered among 0°, +25°, and −25° directions. The prototype of the antenna is fabricated and the performance of the prototype is measured. The measured S parameters and radiation pattern show good agreement with the simulated results. The measured overlapped impedance matching bandwidth of the proposed antenna at all working modes is 18.3%. The proposed antenna has the advantages of low profile, high gain, wideband and adjustable main beam.

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A Wideband Beam-Steerable Slot Antenna Using Artificial Magnetic Conductors With Simple Structure

Cited by 54 publications

References 28 publications

Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

A Novel Beam Steerable Antenna Employing Tunable High Impedance Surface With Liquid Crystal

A low profile wideband pattern reconfigurable metasurface antenna

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