40-GHz MMIC SPDT and Multiple-Port Bandpass Filter-Integrated Switches

Abstract

40-GHz monolithic microwave integrated circuit (MMIC) single-pole-double-throw and multiple-port bandpass filter-integrated switches based on electronically switchable resonators are proposed. The proposed multifunction chip integrates a multiple-port switch with bandpass filter functions in a single chip. The switchable resonators are formed by quarter-wavelength stepped-impedance resonators with passive HEMT loading at one end. By properly allocating the resonant frequencies of the resonators in their on and off modes, a filter-integrated switch can perform a bandpass response with spurious suppression in the on state and achieve wideband isolation in the off state. The technique of using shared resonators is also introduced in the circuit design to reduce the overall circuit size. The results show the proposed circuits successfully integrate a MMIC switch with bandpass filter functions into a single circuit component.

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

“…Filter-integrated switch (FIS) as depicted in Figure 1 is another integrated/multifunction device. From the year 2006 onwards, numerous studies have reported filter-integrated double pole double throw (DPDT) switch [5], single pole single throw (SPST) switch [6][7][8], and SPDT switch [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In order to produce FISs and integrate BPF with SPDT switch in one device, several techniques have been used, such as dielectric resonators (DRs) [15], LC resonators [11], substrate integrated suspended line (SISL) [30], and common shorted stepped-impedance resonator (CSSIR) [25].…”

A compact Ka-band SPDT switch with high isolation

“…Single-pole-double-throw (SPDT) switch is rather important since it can be used in various applications such as transmit/receive modules, phase shifters, attenuators and multi-standard communication systems. Thus, numbers of MMIC SPDT switches have been reported for different applications [1][2][3][4][5][6][7].…”

“…However, they suffer from the drawbacks of relatively high cost and low integration densities. With the development of silicon-based technologies, CMOS or SiGe BiCMOS transistors-based switches have been proposed for low cost and higher integrated capacity [2][3][4][5][6].…”

Low-Insertion Loss Pin Diode Switches Using Impedance-Transformation Networks

“…They achieve as high isolation as 40 dB at the cost of worse insertion loss which is more than 1 dB. Another technique mentioned in [4,5] is to insert a filter to absorb the switch elements parasitic parameters. Good insertion loss and isolation performances have been obtained in both of them but the topologies are complicated and large circuit size is unavoidable.…”