Substrate integrated waveguide based cavity‐backed self‐triplexing slot antenna for X‐Ku band applications

Abstract

A planar substrate integrated waveguide (SIW) based cavity‐backed self‐triplexing slot antenna is proposed for X‐Ku band applications. The antenna comprises of the SIW cavity, radiating slots, and feeding networks. The radiating slots; that are etched on the upper metallic plane of the SIW, are backed up by the three radiated quarter cavities (QCs). The radiating slots in the respective QCs are of different lengths, excited by three separated orthogonal feed lines to resonate at three different frequencies as 11.01, 12.15, and 13.1 GHz. By fine‐tuning the antenna parameters, an intrinsic input port isolation of better than 26 dB is realized which helps in achieving the self‐triplexing property. The behaviors of individual cavity modes at three resonant frequencies are explained with the help of Z‐parameter. The proposed antenna layout is easy to integrate with the planar circuit. The proposed antenna is fabricated and measured results display a close concern with the simulated results. Moreover, a unidirectional radiation pattern and gain of 5.1, 5.54, and 6.12 dBi at resonant frequencies are realized.

Self‐isolated quadruplexing SIW antenna with extremely low frequency ratio for C‐band applications

“…High isolation and low FR are important specifications for radio-frequency identification, radar, and satellite applications. SIW multiband antennas such as selfdiplexers [1][2][3][4][5][6] and self-triplexers [7][8][9][10] have been proposed in the literature which achieved a low FR (f 2 /f 1 = 1.03) and (f 3 /f 1 = 1.18), respectively. However, the design of self-quadplexer antennas for quad-band operation with low FR (f 4 /f 1 ) is difficult, and maintaining port isolation becomes more challenging as the number of ports increases.…”

Compact Substrate-Integrated Hexagonal Cavity-Backed Self-Hexaplexing Antenna for Sub-6 GHz Applications

“…The self-diplexing antennas based on bow-tie ring slot [10], rectangular and triangular slots [11], Y-shaped slots and triangular slots [12] have been developed to obtain dualband operation and achieved significant performance characteristics with a minimum frequency ratio (f 2 /f 1 ) of 1.03. A modified I-shaped slot [13], rectangular slots [14], U-shaped slot [15], and two eighth-mode and one quarter mode cavities [16] are employed on different modes of SIW cavity backed antennas such as half-mode SIW cavity (HMSIW), quartermode SIW cavity and eighth-mode SIW cavity (EMSIW) and achieved a minimum frequency ratio (f 3 /f 1 ) of 1.18 with self-triplexing functionality. Self-quadruplexer antennas have been designed by utilizing different resonating patches [17], U-shaped slots [18], capacitive slots [19], [20], C-shaped and arc-shaped slots [21], and HMSIW with extended resonating slots [22], with a low frequency ratio of 1.34, which is difficult to achieve for a quadruplexing antenna.…”

Substrate integrated coaxial line design for mmWave antenna with multilayer configuration

“…Therefore, effects of multilayer on antennas performances should be considered and eliminated. One possible method is to build structures to guide waves in specific paths, such as substrate integrated waveguide (SIW) that mimics classical rectangular waveguide in substrates to realize a compact high gain with better isolation among ports, 9,10 or the fullmetal cavity-backed slot antennas (CBSAs) that can achieve high efficiency and high gain since they have no dielectric loss. 11,12 In addition, the substrate integrated coaxial line (SICL) structure have been built and applied to filters, [13][14][15][16][17] Baluns 18 for shielding, to waveguide [19][20][21] for transition among different kinds of waveguides, and to antennas for suppressing mutual coupling.…”