Wideband Offset Slot-Coupled Patch Antenna Array for X/Ku-Band Multimode Radars

Abstract

A high-gain, wideband antenna element that covers most portions of X-and Ku-bands is essential for multimode radar applications. This letter presents an aperture-coupled stacked patch antenna for 8.75-12.25-GHz frequency band. Fixed beam tilt up to 30 in scan range can be obtained by offsetting the aperture relative to a driven patch. When there is no offset, a single antenna has broadside gain greater than 10 dBi. An antenna array (4 4) with fixed beam tilt is designed and validated with measurements. The prototype antenna exhibits 44% fractional bandwidth and maximum gain 20.6 dBi in the target frequency band.

Low-Profile Frequency-Scanned Antenna Based on Substrate Integrated Waveguide

“…TABLE III summaries the performance comparison of the published flat FSA arrays. The FSA array in [5] has a little high gain but the scanning angle range is only 20°. The array in [7] has the most scanning range of 147° and a relative small size but the gain is very low.…”

“…However, the antenna gain was low due to the microstrip line loss. A wideband offset slot-coupled patch antenna array covering most X/Ku-band from 8.75 to 12.25 GHz was suggested to apply in multimode radars [5]. The 4×4 array had a beam tilting at 20° by moving the coupling slot within the bandwidth with the maximum gain of 20.6 dBi being achieved.…”

Low loss semi‐MIM hybrid plasmonic waveguide with high electric field confinement

“…According to Reference , hybrid mode is produced in HPWGs by coupling between SP mode and dielectric waveguide mode. For low propagation loss in HPWG, a thin dielectric layer of low refractive index (L‐index) is stacked between a metal and high refractive index (H‐index) dielectric layer to confine dominant mode of SP wave in the L‐index as discussed in Reference . Moreover, to improve field confinement, many efforts like were investigated to design HPWGs just guides SP mode which has TM mode nature (TM mode guarantees high field confinement as explained in References ).…”

A new small high-gain wideband rectangular patch antenna for X and Ku bands applications

“…Therefore, the challenge in microstrip antenna design is to increase the bandwidth and gain [10]. Patch antenna arrays in the X-band have been widely reported in literature [11][12][13][14][15]. Several authors [16][17][18][19] have focused on technical design of microstrip patch antennas for X-band applications.…”