94 GHz Folded Fresnel Reflector Using C-Patch Elements

Low-Cost and High-Efficient W-Band Substrate Integrated Waveguide Antenna Array Made of Printed Circuit Board Process

“…Therefore, given a point-to-point wireless communication link, the W-band spectral window offers the possibility of gigabyte data transmission over several kilometers in normal weather conditions [4]. Wide bandwidth and low atmospheric loss features permit the implementation of high resolution and long range detectors or sensors [5], which may be used in helicopter or aircraft collision avoidance radar [6], civil avoidance security [7], passive millimeter wave imaging [8], and radar sensors [9]. One of the most critical parts of such systems are low-cost, low-profile and lightweight antenna components.…”

“…As key feature information of target echo, polarization information has played an important role in meteorological sounding, geographical remote sensing [1], [2], target polarization detection [3], [4], polarization enhancement [5], polarization filtering [6], polarization anti-jamming and target recognition [7]- [9]. How to acquire polarization information is undoubtedly a basic problem in the investigation of the characteristics of targets.…”

Millimetre‐wave polarization‐dependant monopulse printed Fresnel reflector

“…When the incident field is turned of 90 (perpendicular with the gap of C-shape patch), there's a difference in the reflection phase because of the dissymmetry introduced by the gap (Fig. 3) [11]. In this case: u 1 (i) = u 2 (i).…”

Reflectarray element based on variable line length for millimeter-wave radar applications

“…The critical point in their design is to obtain a reflection phase range varying over 360 degrees. It might be achieved by using variable sized rectangular patches [7], [8], stub-loaded patches [9], variable-length transmission lines in aperture-coupled [10], variable-sized cut ring patches [11] and so on. Nevertheless, at millimeter-wave frequencies, dimensions are still critical for classical printed circuit fabrication technologies because of fabrication tolerances.…”

“…The reflectarray using cut annular ring patches (or C patches) had been reported in [11]. Substrate for the proposed element is a two-layer substrate.…”