Ultra wideband linear horn array antenna with slant polarization

Frequency-Dependent Feeding Methods for Broadband Vivaldi Arrays With Minimum Half-Power Beamwidth (HPBW) Variation

“…roadband antennas and antenna arrays are essential in a wide range of applications; from next generation communications (e.g., 5G), to spectrum sensing and wideband instrumentation systems [1]- [5]. As a result, recent research efforts into the antenna front-end interface are concentrated on the realization of antenna components with broadband operational characteristics [4]- [13]. However, the majority of these pursuits focus on expanding the operational bandwidth (BW) in terms of input reflection without looking into other important parameters, such as the radiation pattern characteristics (e.g., gain, half-power beamwidth (HPBW), side-lobe levels (SLLs), and/or direction of beam) that vary significantly with frequency [6]- [8].…”

“…Typical examples of the aforementioned degradation effects are shown in [9]- [13]. In particular, the tapered-slot antenna array in [9] operates between 1.5 to 6 GHz (4:1) but its HPBW varies from 30° at 1.5 GHz to 10° at 6 GHz (200% variation, where variation indicates the percentage increase from the HPBW at the highest frequency of operation).…”

“…In yet another example, the dual-band four-element array of patch antennas in [12] exhibits a 103% HPBW variation. In [13], an eight-element linear horn array with slant polarization is reported. It operates from 4 GHz to 8 GHz (2:1) but it exhibits a HPBW variation of 67% (12°-20°).…”