Abstract
In this paper, a substrate integrated waveguide (SIW) based self-triplexing antenna (STA) with non-linear replicated hybrid slot (NLR-HS) is presented. To the author’s best knowledge, the concept of NLR is the first of its kind in the literature used for obtaining self-triplexed operation. Initially, the SIW cavity is loaded by a hexagonal slot merged with two rectangular transverse slots that together produce two distinct resonances around 5.23 and 7.50 GHz. The variation in resonant frequencies of both lower and upper frequency bands can be modelled by applying NLR on the hexagonal slot. To achieve the self-triplexing operation, a coaxial probe-fed parasitic hexagonal patch is placed concentrically inside the hexagonal slot. The third resonance is centered around 10.82 GHz and can be modelled with the help of the gap between the hexagonal slot and parasitic patch.To validate the proposed idea, the design is fabricated and experimentally tested. Moreover, the antenna shows a front-to-back ratio (FTBR) better than 25 dB, average isolation of 43 dB and measured gain (efficiency) values of 7.33 (97.39%), 6.66 (95.82%), and 6.28 (97.83%) dBi at three resonances. Good agreement between the simulated and measured results makes the proposed STA a good candidate for practical applications.
Highlights
T HE rapid growth in wireless communication systems has increased the demand of multiband/multi-standard antennas for various operations [1]
The proposed self-triplexing antenna (STA) consists of an inverted V-shaped slot etched on the substrate integrated waveguide (SIW) cavity which divides it into two sub-cavities, one eight-mode while other one quarter-mode
In [18], the reported work shows a dumbbell shaped slot placed on the SIW cavity to radiate at 6.76/8.62/13.33 GHz, supporting C, X- and Ku frequency bands simultaneously
Summary
T HE rapid growth in wireless communication systems has increased the demand of multiband/multi-standard antennas for various operations [1]. When a single patch is excited using orthogonally placed feed lines, the isolation between the ports is hard to achieve (especially when fH fL approaches 2) [13] One solution to these problems is implementation using substrate integrated waveguide (SIW). SIW based STAs with intrinsically isolated input ports and independently tuned frequency bands are discussed in [17]- [18]. The proposed STA consists of an inverted V-shaped slot etched on the SIW cavity which divides it into two sub-cavities, one eight-mode while other one quarter-mode Another STA with improved port isolation, i.e., more than 28.4 dB is proposed in [24]. In [18], the reported work shows a dumbbell shaped slot placed on the SIW cavity to radiate at 6.76/8.62/13.33 GHz, supporting C-, X- and Ku frequency bands simultaneously. The proposed antenna possesses the highest isolation as compared to existing STAs discussed in [17]- [18]
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