Showing papers on "Reflective array antenna published in 2023"
TL;DR: In this article , the authors proposed a pseudo-curved surface conformal (PCSC) phased array antenna for wide-angle scanning in millimeter-wave (mmWave) networks.
Abstract: To perform wide-angle scanning while maintaining a planar low profile, we propose a new kind of millimeter-wave (mmWave) planar phased array antenna using inclined beam elements to imitate a curved surface conformal (CSC) array, called a pseudo-curved surface conformal (PCSC) phased array antenna. We present the concept of our PCSC phased array and then design an elongated planar aperture antenna (EPAA) element, achieving stable high broadside gain and wide beam on the scanning plane within a wide bandwidth. Then, by introducing asymmetries to the EPAA element, the beam inclination of the EPAA element can be adjusted. Accordingly, we use EPAA elements with different beam inclinations to form a 1 × 4-element 1-D wide-angle scanning PCSC phased array antenna. We design, fabricate, and measure a prototype of our proposal, with measured results showing that the proposed design has a 3 dB gain variation across a scanning range of more than ±62° (and as high as ±68°) within the 5G mmWave band (24.25 to 29.5 GHz), which is about ±10° better than its traditional counterpart.
1 citations
26 Mar 2023
TL;DR: In this paper , two beam broadening techniques for active electronically scanned array (AESA) antennas using phase-only control are proposed, which are suitable for various applications and involve an efficient optimization of phase tapering.
Abstract: Two beam broadening techniques for active electronically scanned array (AESA) antennas using phase-only control are proposed. As a preliminary step, the problem dimensionality is reduced from five to only two variables. The first method is suitable for various applications and involves an efficient optimization of phase tapering. The second technique is more specific for radar AESAs typically transmitting pulse trains used for coherent integration. Here, time dependent phase modulation is employed to effectively produce amplitude tapering resulting in beam broadening.
TL;DR: In this article , a center-fed collinear antenna array with a compact size is developed which based on the turnstile antenna, which can be used to omnidirectional radiation applications.
Abstract: In the fifth-generation (5G) wireless communications, due to the advantages such as wide range and low cost, sub-6 frequency band is widely used. It is a challenge to develop the antennas for sub-6 base stations which are wide band, high gain and compact. In this paper, a center-fed collinear antenna array with a compact size is developed which based on the turnstile antenna. Non-uniform dipole array has been used to achieve broadband so that the disadvantages of series can be improved. The gain bandwidth has been significantly increased as compared to uniform array antennas. Wider directivity gain bandwidth of 35% is provided by the non-uniform array. The proposed array antenna can be used to omnidirectional radiation applications. The directivity gain bandwidth reached to 20.7% better than traditional series fed antennas.
TL;DR: In this paper , the potential of dynamically steering the null locations in equally spaced linear scanning array antennas using the electronically displaced phase center antenna (E-DPCA) technique was investigated for the first time in this communication.
Abstract: The potential of dynamically steering the null locations in equally spaced linear scanning array antennas using the electronically displaced phase center antenna (E-DPCA) technique is investigated for the first time in this communication. The relative coordinates, and thus, the element spacing, of the equally spaced linear array antennas are electronically varied using the E-DPCA technique to adaptively steer the null locations without any physical displacement while maintaining the same overall array length. The versatility of the proposed technique is further explored by: 1) generating consecutive nulls with a minimum resolution of 1° between them and 2) simultaneously steering the null locations and scanning the main beam.
TL;DR: In this paper , the authors proposed reverse thinking, i.e., low scattering performance precedes radiation performance, and presented a universal and definite route to achieve low-RCS array antennas directly from metasurfaces rather than from antennas.
Abstract: In the conventional routes to obtain stealth array antennas, various techniques are used to reduce the radar cross sections (RCSs) of existing antennas based on experience-relying trial-and-error and time-consuming optimizations. To address the issue, we propose reverse thinking, i.e., low scattering performance precedes radiation performance, and present a universal and definite route to achieve low-RCS array antennas directly from metasurfaces rather than from antennas. A specific design method is carefully elaborated to illustrate this route. First, a low RCS metasurface is designed. Then an interdigital arrangement of the metasurface and proper feeding techniques are exploited to excite parts of the metasurface cells to produce efficient radiations. These partially excited cells play twofold roles as the radiating structures for array antenna and as part of scattering structures for the low-RCS property. As examples, 1-D and 2-D metasurface-based array antennas are elaborately designed and fabricated, in which good radiation performance and broadband low RCSs are achieved simultaneously. Both numerical simulations and experimental results verify the effectiveness of the proposed method. It suggests that the proposed route is more likely to speed up the design process and yield an integration structure and controllable performance.
01 Jan 2023
TL;DR: According to the principle of beamforming, antenna beams can be formed in radio frequency (RF), analog and digital domains, and array antennas in which both receiving and transmitting beams are digitally formed are called digital array antennas as discussed by the authors .
Abstract: According to the principle of beamforming, antenna beams can be formed in radio frequency (RF), analog, and digital domains, and array antennas in which both receiving and transmitting beams are digitally formed are called digital array antennas.