Exploiting Higher Order Modes for Grating Lobe Reduction in Scanning Phased Array Antennas

Iqbal, Zabed; Pour, Maria

doi:10.1109/tap.2019.2934822

Cited by 21 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18 The fundamental mode with broadside radiation pattern and any higher-order mode with conical radiation pattern are excited together to realize the tilted beams by a shared aperture radiator. 19,20 In a study by Iqbal et al, 21 the TM 11 and TM 21 modes are excited to generate the tilted beams by slots and posts loaded circular patch, the antenna can realize a wide beam scanning range with a low grating lobe, but the antenna unit needs an extra channel to excite the high order mode with different phase differences, which will greatly increase the cost of communication systems for the large size array. In the study by Chen et al, 22 a mixed-mode dielectric resonant antenna (DRA) is used to achieve the wide beam scanning range.…”

Section: Introductionmentioning

confidence: 99%

Design of a pattern reconfigurable antenna for wide‐angle scanning phased array applications

Cao

Feng

Yan

2022

Micro & Optical Tech Letters

View full text Add to dashboard Cite

In this article, a pattern reconfigurable antenna is proposed for wide beam scanning phased array applications. Different from the wide beamwidth unit design, the large beam scanning range of the proposed antenna array is realized by the reconfigurable radiation patterns with the different tilted angles of the antenna unit. The tilted beams can enhance the total beam coverage range of the antenna unit with high directivity, thus increasing the beam scanning range of the antenna array. The tilted beams are realized by the combination of the concentric circular and annular patch antennas. A PIN diode-loaded reconfigurable feeding network is designed to feed the patches with reconfigurable phase differences. The feeding network can achieve a good impedance matching effect and guarantee the symmetry of the tilted beams. To verify the beam scanning performance of the proposed antenna, a 1 × 4 linear array is fabricated and measured. The results prove that the antenna can achieve ±61°beam scanning range with ±78°3 dB beam coverage range and the maximum sidelobe level (SLL) of −8.0 dB. The characteristics include lowprofile, high efficiency, low SLL, and wide beam scanning range making it a very attractive choice for phased array antenna applications. K E Y W O R D S microstrip antenna, phased array antenna, reconfigurable antennaHow to cite this article: Cao Y, Feng P, Yan S. Design of a pattern reconfigurable antenna for wide-angle scanning phased array applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Design of a pattern reconfigurable antenna for wide‐angle scanning phased array applications

Cao

Feng

Yan

2022

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…However, all of the aforementioned grating lobe reduction methods and array syntheses use conventional singlemode antennas as an element. In contrast, adaptive multi-mode antenna elements exhibit unique self-scanning and nulling characteristics, which have been utilized by the authors in hexagonal planar phased arrays [21,22] to reduce grating lobes for small-, medium-, and wide-scan angles by uniformly tapering the amplitude coefficients of the peripheral elements. Recently, preliminary results of grating lobe reductions in a planar array using the dual-mode elements for scan angles up to 45 • were presented by the authors in [23], wherein the standard −30 dB Tschebyscheff distribution was applied to the array without any further optimization.…”

Section: Introductionmentioning

confidence: 99%

Addressing Grating Lobes in Linear Scanning Phased Arrays With Self-Nulling Elements and Optimized Amplitude Distributions

Iqbal¹,

Pour²

2021

PIER M

Self Cite

View full text Add to dashboard Cite

An effective method to reduce grating lobes in linear scanning phased array antennas with large element spacing of one wavelength is presented. The proposed technique is based on employing self-nulling antenna elements by simultaneously exciting the first two modes in a circular microstrip patch antenna to partially nullify the grating lobes. More importantly, a modified amplitude tapering is optimized in the array level to facilitate the grating lobe reduction for relatively wide scan angles up to ±60 • . Analytical results of a 21-element linear array are fully presented, and a −22.5 dB grating lobe reduction for up to ±60 • scan angles is reported using the proposed method, followed by the results of a smaller array for validation purposes.

show abstract

“…There are also a few recent works that demonstrated the grating lobe reduction capability of the multi-mode excitation technique in phased arrays (with seven elements arranged in a linear or hexagonal topology) having a large element spacing. 16,17 However, they aim to modify the (common) element pattern (which is to be multiplied by the array factor) so as to achieve sufficient gain toward the scanning angle, while placing a null at the angle of the grating lobe.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of multi-port multi-mode excitation for nullscanning, a constant 90-degree phase shift is used between the two ports of each element. 16,17 The common amplitude ratio at the two ports of each element, and the excitation amplitude ratio between the center element and the peripheral elements are found via an extensive search routine. A primitive study toward optimizing the excitation coefficients was also conducted.…”

Section: Introductionmentioning

confidence: 99%

Optimization ofvirtually aperiodiclinear sparse arrays

Aslan

2021

Micro & Optical Tech Letters

View full text Add to dashboard Cite

Multi-port multi-mode antenna elements have the ability to move their phase centers and modify their radiation patterns electronically. Arrays composed of such elements are referred to as virtually aperiodic arrays in this paper. Herein, optimization of the mode excitation coefficients in virtually aperiodic sparse linear arrays is proposed, by introducing novel design constraints with the aim of synthesizing wide-angle scanning, reconfigurable patterns, with grating/side lobe reduction. A dual-mode patch antenna is used for demonstration purposes. An efficient convex optimization based algorithm is adopted to optimize the excitation weight at each element mode port, while considering the mutual coupling effects. Through full-wave simulations, the effectiveness of the optimization in suppressing the unwanted radiation and adapting to different fields-of-view is shown. A novel investigation on the impacts of defining different mode excitation ratios on the radiation pattern characteristics is conducted.

show abstract

Exploiting Higher Order Modes for Grating Lobe Reduction in Scanning Phased Array Antennas

Cited by 21 publications

References 22 publications

Design of a pattern reconfigurable antenna for wide‐angle scanning phased array applications

Design of a pattern reconfigurable antenna for wide‐angle scanning phased array applications

Addressing Grating Lobes in Linear Scanning Phased Arrays With Self-Nulling Elements and Optimized Amplitude Distributions

Optimization ofvirtually aperiodiclinear sparse arrays

Contact Info

Product

Resources

About