Abstract
In this paper, a low profile substrate integrated waveguide (SIW) based self-quadplexing antenna with high isolation is demonstrated for multiband wireless applications. Here the SIW based resonator cavity is integrated with an “X”-shaped resonator and formed the four quarter mode cavities having the individual microstrip feed lines. Each quarter mode cavity consists of “V”-shaped slots of different lengths; are in front to feed line and produce the four distinct resonant frequencies at 7.8 GHz, 8.5 GHz, 10.2 GHz, and 10.6 GHz, respectively. The working principle depends upon the perturbation of higher-order modes in a particular quarter mode cavity. The minimum intrinsic isolation of below than −26dB is attained between any of the two input ports by adequately modifying the antenna dimensions. Hence, a single antenna consists of four individual signals without interfering with each other, which determines the self-quadplexing property of the antenna. The proposed antenna is realized for maximum efficiency and minimum value of frequency ratio. The measured gain of the proposed antenna is 4.5 dBi, 5.28 dBi, 7.1 dBi, and 7.4 dBi at the four resonant frequencies, respectively.
Highlights
In recent years, accelerated advancement and rapid development are necessary for innovative antenna modules, autonomous satellite subsystems, as well as in radar vehicles; are highly required in the field of communication
EXPERIMENTAL RESULTS In the manner to define the justification of the simulated design, the proposed self-quadplexing antenna structure was fabricated by using the Rogers RT/Duroid 5880 as shown in Fig. 5(e) and 5(f) and various results are measured such as Sparameters, radiation pattern, gain, and efficiency
The overall isolation among input ports is better than -26 dB is achieved, which is observed as an attractive module for self-quadplexing technology
Summary
In recent years, accelerated advancement and rapid development are necessary for innovative antenna modules, autonomous satellite subsystems, as well as in radar vehicles; are highly required in the field of communication. Shaped cavity is used to convert the SIW cavity into four distinct quarter mode (QM) resonating cavities These QM cavities consist of 4 individual “V”-shaped radiate slots of different lengths and excited by separate microstrip feed lines of 50 Ω. The proposed “X”-shaped cavity is integrated into the primary SIW cavity and turned into the four distinct QM resonating cavities of different lengths and sizes. Leff is the effective length of the particular QM cavity; as for QM cavity 1, the linear length is L1 and length L2, L3, and L4 related to length for QM cavity 2, QM cavity 3, and QM cavity 4, respectively in equation 2 [24]
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