Absorptive Filter Integrated Single Pole Double Throw Switch Using Switchable T-Shape Resonator for Iot Applications

Abstract

In this paper, an absorptive filter-integrated switch (FIS) using switchable T-shape resonators is presented. The FIS was made up of two absorptive T-shape resonators and integrated with single pole double throw (SPDT) switch. A simple mathematical analysis of isolation and insertion loss of filter-integrated SPDT switch is discussed. PIN diodes were used as the switching elements for the SPDT switch and to reconfigure between the band-stop and bandpass responses. The proposed absorptive FIS design could be used for internet of things (IoT) applications such as Zigbee and Bluetooth at an operation frequency of 2.45 GHz. As a result, the proposed FIS exhibited low magnitude of insertion loss and high isolation. Therefore, the key advantages of the proposed FIS design are low insertion loss, high isolation, and good return loss at both ON-and OFF-state ports.

Design of Filter Integrated SPDT Switch Using Capacitor Loaded Ring Resonator with High Isolation

“…Bandpass filter (BPF) integrated single-pole double-throw (SPDT) switch (FIS), as depicted in Figure 1, is another integrated/multifunction device. Many efforts, i.e., reused switchable Lshaped resonator [7], dual-mode microstrip-cavity structures [8], suspended-controllable resonators [9], standing-wave-filtering structures [10], capacitively-coupled LC resonators with loaded PIN diodes [11], switchable T-shape resonators [12], distributed coupling quarter-wavelength resonator with loaded PIN diode [13], in-house developed 3D-TSV-MEMS [14], and fractal stub-loaded resonator (F-SLR) [15], have been developed to integrate filters and SPDT switches. Nevertheless, the aforementioned filtering-SPDT switch works suffered from high insertion loss (IL) [11][12][13][14], low ports isolation [8][9][10][11][12][13][14][15], or low-frequency selectivity [7][8][9].…”