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

Abstract

This article presents a simple, compact, and lightweight substrate integrated waveguide (SIW) backed self‐quadruplexing antenna for quad‐band applications. The design procedure is straightforward. Topside of the SIW cavity is modified to form four patches of different lengths which are fed separately by four 50‐Ω microstrip feed lines and operate at 5.14, 5.78, 6.74, and 7.74. It attains 4.1, 4.96, 6.2, and 6.1 peak gain at the above frequencies, respectively. The observed front‐to‐back‐ratio is more than 17.5 dB and the isolation level is above 28 dB. This antenna topology allows to redesign each resonant frequencies as per application requirement using a single parameter and without disturbing other performances. Design guidelines for developing the proposed antenna are provided. A prototype antenna is fabricated using RT‐Duroid (5870) substrate and characterized for validation. The proposed antenna is suitable for handheld microwave devices for C‐band communication.

Self-quadplexing slot antenna for S and C-band applications

“…Here the minimum isolation of 30.48 dB is obtained among the input ports, as shown in Figure 9. The values of all the lumped elements as parallel RLC and series LC sections [20], [21] are given in Table 3 The antenna has adequate isolation of better than 30.5dB among ports with reasonable characteristics as the higher front-to-back ratio (FTBR) and smaller electrical size than others [13], [22], as displayed in Table 4 also. As in [23] and [22] are required extra quadplexer device to maintain reasonable isolation among the input ports.…”

“…The values of all the lumped elements as parallel RLC and series LC sections [20], [21] are given in Table 3 The antenna has adequate isolation of better than 30.5dB among ports with reasonable characteristics as the higher front-to-back ratio (FTBR) and smaller electrical size than others [13], [22], as displayed in Table 4 also. As in [23] and [22] are required extra quadplexer device to maintain reasonable isolation among the input ports. The present antenna is a multi-port multi-band device with better radiation efficiency and uni-directional radiation patterns.…”

“…The present antenna is a multi-port multi-band device with better radiation efficiency and uni-directional radiation patterns. At the same time, [23] and [22] are the multi-band single port element and give bidirectional radiation mechanisms.…”

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

“…Over the last few years, substrate-integrated waveguide (SIW)-based antennas have received a lot of attention due to their small size, multi-band operation, superior isolation, and enhanced radiation properties [8][9]. Recently, many self-diplexing antennas [10][11][12][13][14], self-triplexing antennas [15][16][17][18], self-quadruplexing antennas [19][20][21][22][23][24], and selfmultiplexing antennas for hexaband applications [25][26] have been reported. Generally, two, three, four, and six feeding ports are applied to develop self-diplexing, selftriplexing, self-quadruplexing, and self-multiplexing antennas that radiate at dual, triple, quad, and hexa operating bands, respectively.…”

“…Recently, several self-quadruplexing antennas have been designed using a number of new SIW cavity-backed slot resonators [18][19][20][21][22][23][24]. In [18], self-quadruplexing antennas with circular polarization characteristics have been implemented using a square SIW cavity with T-shaped slots.…”