Wide-scan Phased Array Antenna Research Articles

Single-PCB Fabricated, Ultrawideband, and Wide-Scanning Phased Array Antenna With Vertically Integrated Resistive Frequency-Selective Surface

Single-PCB Fabricated, Ultrawideband, and Wide-Scanning Phased Array Antenna With Vertically Integrated Resistive Frequency-Selective Surface

Aperture Fed Microstrip Dual Polarization Wide Scan Phased Array Antenna With Mutual Coupling Reduction

Aperture Fed Microstrip Dual Polarization Wide Scan Phased Array Antenna With Mutual Coupling Reduction

Conformal Array Antenna for Applications in Wide-Scanning Phased Array Antenna Systems

A dipole with four branches, fed by Marchand balun, is designed to be conformal with wing of an unmanned aerial vehicle. With the help of branches, the proposed dipole element achieves a better impedance matching performance. Meanwhile, the metallic coupled strip is added to move the scanning blindness out of the operating frequency band, without deterioration at broadside radiation. Besides, the beamwidth in the vertical plane, i.e., the H-plane of the dipole, can be effectively compressed by loading three metallic strip directors, and the element gain increases as well. Based on the dipole element, a 12-element linear phased array is designed and simulated. The simulated results show that the array achieves ±60° scanning range in the horizontal plane, with the voltage standing wave ratio lower than 2.5 in the operating band of 2.4∼3 GHz. Moreover, the 3 dB beamwidth in the H-plane is 81° at the center frequency of 2.7 GHz. The measured results of the fabricated antenna prototype agree reasonably well with the simulated ones, which verify the feasibility of the wing-conformal linear phased array design.

Wide-scan Phased Antenna Array Based on Cavity-Backed ELC-Slot Microstrip Patch Antenna Element

ABSTRACTThis paper presents a novel wide-scan phased array antenna based on metamaterial (MTM) electrical LC (ELC) slot and L-probe fed cavity-backed patch antenna element in X-band. The antenna uses the ELC-slot as the main radiating element and a meta-tool to reduce mutual coupling between array elements by eliminating horizontal far-field radiation. Applying the proposed MTM ELC-slot in the patch to improve impedance matching and widening of scanning range is simulated and investigated. The simulation results have shown wide-angle impedance matching up to 80˚ in both E-and H-planes over 6.25% bandwidth in X band.

Broadband impedance-matched near-zero-index metamaterials for a wide scanning phased array antenna design

We present broadband near-zero-index metamaterials composed of dielectric resonators and metallic rods, whose permittivity ε and permeability μ are near-zero simultaneously. It is notable that the values of permittivity ε are equal to those of permeability μ over a broadband frequency range of 8.45 GHz to 10.5 GHz, indicating the impedances of the proposed near-zero-index metamaterials match vacuum in this broadband. The broadband near-zero-index metamaterials for manipulating radiation sources are analyzed. We also demonstrate numerically that such near-zero-index metamaterials can offer a unique grating condition in a phased array antenna, with the beam scanning angle range beyond the critical angle limit of the grating lobe.

Wideband Wide Scan Phased Array Antenna by Vector Elements

A wideband wide scan phased array antenna unit cell based on vector antennas operable to radiate different patterns is provided. The proposed unit cell consists of four radiating elements. When one of the elements is radiating in the presence of the other element, a null is generated in a radiation pattern of the first radiating element and also the level of coupling is significantly decreased. With the controlling of the feed network of these elements two different operation modes are defined. Results show that the proposed structure achieves 40% bandwidth and +80° scanning range.

Wide scanning phased array antenna design in Ka band

A millimetre wave active phased array antenna has been developed that is capable of wide scanning angle in both E- and H-planes with small deviation in antenna gain. In order to solve this problem, a dipole antenna with parasitic element has been adopted, which may have the capability of adjusting the influence of mutual coupling in the array element pattern. The design of the parasitic element is examined and the effect of its shape on pattern characteristics is confirmed by experiment. Beam scanning angles of ±57.3 degrees in the E-plane and ±68.2 degrees in the H-plane were obtained for each array antenna pattern.