SIW‐based cavity‐backed self‐diplexing antenna with plus‐shaped slot

Abstract

A substrate integrated waveguide (SIW)‐based planar cavity‐backed self‐diplexing antenna, designed for X‐band applications, is presented in this article. The proposed antenna is fed by two orthogonal 50 Ω microstrip lines. Two orthogonal rectangular slots, combination of which makes a plus‐shaped slot, of different lengths are etched on the top of the SIW cavity. Due to the unequal arm lengths of the plus‐shaped slot, the antenna radiates at two distinct frequencies. An isolation of better than 20 dB is achieved between the two ports and hence, the proposed antenna exhibits self‐diplexing characteristics. The antenna offers a gain of 5.7 dBi and 5.94 dBi at 8.55 GHz and 9.77 GHz, respectively.

A compact substrate integrated waveguide backed self‐quadruplexing antenna for C‐band communication

“…The proposed four‐port self‐quadruplexing antenna is compared with some published single port multiband/quad‐band 1‐3 and some self‐multiplexing 11‐13 and 14‐18 antennas in Table 2. Unlike other antennas, 1‐3 the self‐multiplexing antennas do not require external multiplexing circuit and allows independent frequency tuning.…”

“…This feature helps the antenna to reduce its overall device size. Compared to other self‐di/triplexing antennas, 11‐16,20 the proposed self‐quadruplexing antenna seems improved in terms of size and antenna type. However, its size, isolation, and front‐to‐back ratio (FTBR) levels are improved than other self‐quadruplexing antennas 17,18 …”

“…In addition to compactness, 4‐7 the SIW based self‐diplexing antenna 11 features low‐back lobe radiation and importantly high port isolations. Since then various multiplexing antennas such as self‐diplexing, 11‐13 self‐triplexing 14‐16 antennas have been reported for dual‐band and triple‐band operations, respectively. It is observed that with the increase in the number of ports it is more challenging to maintain isolation among them.…”

Design of a compact orthogonal fed self‐diplexing bowtie‐ring slot antenna based on substrate integrated waveguide

“…This integration of diplexer circuit with the dual‐band antenna leads to increase the size and cost of the entire RF communication system. To overcome these issues, many self‐diplexing slot antennas employing SIW cavity have been implemented 14‐17 . In Reference 14, a self‐diplexed antenna based on the SIW cavity has been realized using bowtie‐shaped slot for radiations at 9 GHz and 11.2 GHz.…”

Siw Cavity Mimo Antenna Using Hybrid Boundaries and Anti-Symmetric U-Shaped Slots

“…However, due to the completely-closed structure of SIW cavities, etched slots should be employed to radiate cavity energy into free space. In recent years, SIW cavity antennas using rectangle [2], bow-tie [3], U-shaped [4], crossed-shaped [5], and triangular-ring [6] slots have been reported.…”