Monopulse RLSA Antenna with Gap-Waveguide Feeding Network for Space Debris Radar at 94 GHz

A Metasurface Radar Monopulse Antenna

“…Although our antenna is the thinnest among the latter, its main advantage is the possibility of providing very high directivities with a Accepted manuscript / Final version scalable solution. It is to be observed that our solution provides the highest measured directivity among the selection of low-profile monopulse antennas in Table II (the values in [17] are simulated ones). Future developments should improve the depth of the nulls and the beam symmetry for the different  beams.…”

“…A thicker double-layer SIW slot array was proposed in [13] for scanning, but its fabrication involves via drilling and an accurate substrate alignment. The most similar solutions compared to our MTS are the RLSAs in [16] and [17] and the radial LWA in [18]. Although our antenna is the thinnest among the latter, its main advantage is the possibility of providing very high directivities with a Accepted manuscript / Final version scalable solution.…”

“…The antenna had a 2.68 radius; it was fed by a two-port microstrip Butler matrix to provide a  broadside beam with 22.2 dBi directivity and a single conical  beam with maxima at 9.4° in elevation. A similar approach was used in [17] at W band. The resulting layout features a 4.5cm diameter aperture operating at 94GHz with a maximum directivity of 32.3dBi.…”

Triple-Radiation Pattern Monopulse Horn Feed With Compact Single-Layer Comparator Network

“…S INCE it was initially conceived [1], radar technology has experienced an enormous development and nowadays it constitutes the keystone of a wide range of different applications. These are found not only in the military area [2], [3], but also in other civil scenarios like air traffic control [4], [5], remote sensing [6], [7], the automotive sector [8], [9], meteorology [10], [11] or space debris detection among others [12], [13]. In Ka-band, as the design in this paper, different radar applications are found, like airport surveillance or traffic enforcement cameras activated by radar [14]- [16].…”

3-D-Printed Modified Butler Matrix Based on Gap Waveguide at W-Band for Monopulse Radar

“…Due to the wide range of W-band applications, specifically around 94 GHz, this article focuses on a proposal for a modified Butler matrix with 94-GHz design frequency. This modified Butler matrix can be coupled to an antenna to provide both a point-to-point communications system and a monopulse radar system [5], [12].…”