Substrate integrated waveguide dual‐frequency dual‐sense circularly polarized cavity‐backed slot antenna

Abstract

A novel design of dual‐frequency dual‐sense circularly polarized (CP) substrate integrated waveguide (SIW) cavity‐backed slot antenna is presented for dual‐band wireless communication systems. The proposed antenna consists of square SIW cavity, asymmetrical bow‐tie‐shaped cross slot and probe feed. Due to use of asymmetrical bow‐tie‐shaped cross slot, circularly polarized wave radiates at two different frequencies with opposite sense of polarizations. The RHCP radiation occurs at (10.45‐10.54) GHz (Lower band) and LHCP occurs at (11.26‐11.34) GHz (Upper band). Moreover, in each band, sense of polarization can be change by changing the feed position. The front to back radiation ratio (FTBRR) is more than 10.5 dB and cross polarization level is lower than −20 dB in both the bands.

Integrated substrate groove gap waveguide and application for filter design

“…Compared with traditional groove gap waveguide, 14 the Integrated‐SGGW has simple machining, high integration and low profile, as well as additional design freedoms. The dielectric loss of Integrated‐SGGW can be relieved by using the lower loss substrate.…”

“…Substrate Integrated Waveguide (SIW) and Gap Waveguide (GW) have been proposed and used in the integrated microwave and mmW circuits 12–15 . GW, which has lower transmission loss than that of SIW, is composed of two parallel metal plates without electrical contacts; and electromagnetic wave can be transmitted only via a guiding structure on the metal plate, which has perfect magnetic conductor (PMC) on both sides of the structure.…”

Circularly‐polarized cavity‐backed slot antenna array with simplified feeding structure

“…The proposed slot antenna array (up to 8 Â 8 elements) owns a simple antenna structure without using any power dividers and phase shifters/ polarizers. These merits are obtained along with a narrow bandwidth, which is due to that: (1) The degenerate cavity modes [11][12][13][14][15][16][17][18][19][20] are used to achieve CP radiation (Main factor);…”

“…[8][9][10] Besides, full-metal slot antennas are highly demanded in high-power communication systems for their high power-handling capacity.Circularly polarized antennas are widely used in satellite and radar communication systems to reduce polarization mismatch and multi-path interference. The degenerate modes is a widely-used method to design CP antennas, [11][12][13][14][15][16][17][18][19][20] including CP patch antennas, [11][12][13][14] CP SIW slot antennas, 15-19 and metal cavity slot antenna. 20 This…”

Low‐profile dual‐band dual circularly polarized patch antenna with small frequency ratio

“…Besides, the slot antenna with asymmetrical bow-tie-shaped cross slot was proposed in Ref. 20, which acquired dual-band dual-CP performance. In Ref.…”