Realization of a Wideband Series-Fed 4 × 4-Element Waveguide Slot Array in the X-Band

Abstract

The series-fed subarray still plays a critical role in a partially-corporate-fed array, which has advantages over the corporate feed one in terms of both beam steerability and freedom in array sizes. In this paper, two techniques are presented for the wideband design of series-fed waveguide slot arrays. Firstly, the overload technique is adopted to design standing-wave fed 1 × 4-element arrays of both coupling slots and radiating slots. The simulated bandwidths for |S 11 | < -15 dB are enhanced to 8.1% and 12.2%, respectively.Secondly, the open-cavities, namely decoupling structures above radiating slots, are introduced to suppress the mutual couplings among a 4 × 4-element array. Its bandwidth for |S 11 | < -15 dB is significantly improved from 5.1% to 11.3%. For demonstration, a 4 × 4-element array is designed in the X-band, and is fabricated by Direct Metal Laser Sintering technique. The measured bandwidths for |S 11 | < -12.5 dB and the antenna efficiency higher than 70% are as wide as 12.4% and 9.5%, respectively. The validity of those wideband design techniques is verified.

A Circularly Polarized Non-Resonant Slotted Waveguide Antenna Array for Wide-Angle Scanning

“…Due to the limitation of the element distance, it is challenging to design a phased scanning slotted waveguide array with multiple polarizations. However, the regular fixedbeam slotted waveguide antenna arrays offer numerous valuable electric characteristics, such as wide-band polarization [12], dual-band, dual polarization [13][14][15], and circular polarization. Circularly polarized slotted waveguide arrays can be categorized into three distinct types based on their circular polarizer structures: the compound slots, the circular polarization patch or dipole, and the circular polarization (CP) cavity.…”

Broadband, high gain 2 × 2 subarray and 2 × 8 cavity‐backed antenna arrays for 5G mmWave applications

“…31 Full metal antenna arrays usually have the drawback of having narrow bandwidth. [32][33][34][35][36] Different approaches are studied to improve bandwidth. In You et al, 13 stubs are introduced in the cavity layer.…”

“…Full metal antenna arrays usually have the drawback of having narrow bandwidth 32–36 . Different approaches are studied to improve bandwidth.…”

A K-Band Series-Fed WR42 Waveguide Horn Array with Beam Squint Reduction through Shunt Delay Sections

“…Series feeds do present several advantages over corporate feeds, one of which is greater flexibility in array design as array sizes are not limited to 2n elements. Series feeds can also be designed to be more compact and can achieve higher efficiencies [5][6][7], which has motivated research into the solution of the beam squint problem. Beam squint in leaky wave antennas is usually overcome with a compensation lens at the output of the antenna that corrects the beam by squinting the beam in the opposite direction [8,9].…”