Hexa‐band SIW cavity antenna system integrating two antennas with high isolation

Abstract

A hexa-band substrate integrated waveguide (SIW) cavity antenna system integrating two antennas with high isolation is proposed. A square SIW cavity is divided by a wide slot into two half sub-cavities. Two narrow slots are etched in the upper sub-cavity and other two slots are cut in the lower sub-cavity to achieve multi-band operation. Six half-mode resonances with different sizes can occur in a single cavity. They are excited by two coaxial ports to form two integrated antennas. A fabricated sample with the overall size of 0.63λ 0 × 0.63λ 0 has been measured. The measured frequencies excited by port 1 are 2.31 GHz (f 1), 2.91 GHz (f 2), and 3.35 GHz (f 3). The resonating frequencies excited by port 2 are 2.57 GHz (f 4), 3.11 GHz (f 5), and 3.61 GHz (f 6). The measured gain and efficiency at the above frequencies are higher than 5 dBi and 72%, respectively. Moreover, the measured isolation between these integrated antennas is better than 22 dB within the frequency of interest. The proposed antenna system offers advantages of compact size, hexa-band operation, high isolation, and unidirectional radiation, which has potential applications in multi-standard wireless systems.

Design of Compact Self-Quintuplexing Antenna With High-Isolation for Penta-Band Applications

“…To accommodate multiple standards into a single system, multiple planar antennas are required, which not only increases the size of the wireless system but also leads to interference between the antennas. To mitigate this issue, the best solution for multi-standard applications is a singlefeed antenna with multiple resonances supporting various bands and effortlessly adapting to the shape of new communication systems due to their lightweight, small footprint, low cost, and easy manufacturing [1][2][3][4][5][6][7]. In the literature, several design techniques have been demonstrated for quad-band operations [1][2][3], pentaband operations [4][5][6], and hexa-band operations [7].…”

Self-diplexing mixed-coupling bandpass filter based on single slotted SIW cavity

“…Nowadays, self‐multiplexing components have attracted growing research interests, which can make wireless systems simple, compact, and low‐cost with the elimination of complex multiplexers, circulators, and isolators [6 ]. Self‐diplexing and self‐triplexing antennas based on a single SIW cavity have been reported in [7, 8 ]. However, a large frequency ratio (FR) is hardly implemented and their operating bandwidth is generally very narrow.…”

Half‐mode SIW cavity antenna for tri‐band MIMO applications

“…7,8 On the other hand, multiband antennas are also the required, which can significantly reduce antenna quantity and cost. 9 Although dual-band and tri-band antennas have been developed in References 10-13, integrating multiple MIMO antenna elements with multiband operations in a HM SIW cavity is rarely studied so far.…”

“…Nowadays, multiple‐input‐multiple‐output (MIMO) antennas are in great demand, which can greatly increase the data rate and link reliability of wireless systems . On the other hand, multiband antennas are also the required, which can significantly reduce antenna quantity and cost . Although dual‐band and tri‐band antennas have been developed in References , integrating multiple MIMO antenna elements with multiband operations in a HM SIW cavity is rarely studied so far.…”