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This paper proposes a novel 150-GHz single-pole-double-throw (SPDT) switch based on a rat-race coupler topology. It is designed with a 0.13-μm SiGe BiCMOS and occupies a chip area of 507 μm×542 μm. The switch achieves insertion loss of 4.0 dB/3.3 dB, isolation of 36.3 dB/35.9 dB, input return loss of 18.7 dB/12.3 dB, output return loss of 21.7 dB/26.1 dB and power-handling capabilities of 22.2 dBm/15...
A new tunable resonator is proposed with an electrostatically biased multi-walled carbon nanotube (MWCNT). The biasing voltage will induce the self-heating effect in the structure and lead to a nonuniform electric field distribution. The equivalent circuit parameters are obtained by numerically analyzing the related electrothermal coupling. Then, the resonant frequency of the resonator is calculated...
This paper describes the propagation characteristics of graphene-based rectangular waveguide. By using mode-matching technique, the guide-wave characteristics of graphene-based waveguides are studies in details with boundary condition defined. It is found that the graphene-based waveguide has low attenuation when frequency beyond its cutoff frequency. It is also demonstrated that hybrid modes (simultaneous...
A microstrip grid array antenna excited by coaxial-fed slot on Rogers 5880 substrate is reported. The antenna has a volume of 70 × 70 × 1.041mm. The coaxial-fed slot is 0.2-mm offset from the middle of the ground plane to obtain symmetrical patterns and a cavity is added below the slot to increase the front-to-back ratio. Simulation results in HFSS indicates that the antenna has a 10-dB impedance...
This paper presents a fully integrated 166-GHz frequency synthesizer (FS) in 0.13-μm SiGe BiCMOS technology. The proposed FS consists of a 20-GHz phase-locked loop (PLL) and a frequency multiplier including a doubler (×2) and a quadrupler (×4). The FS generates the D-band output signals from 164.08 to 166.19 GHz. At 166.19 GHz, the measured phase noises at 100-kHz and 1-MHz offset frequencies are...
This paper presents a fully integrated 166-GHz frequency synthesizer (FS) in 0.13-μm SiGe BiCMOS technology. The proposed FS consists of a 20-GHz phase-locked loop (PLL) and a frequency multiplier including a doubler (×2) and a quadrupler (×4). The FS generates the D-band output signals from 164.08 to 166.19 GHz. At 166.19 GHz, the measured phase noises at 100-kHz and 1-MHz offset frequencies are...
An enhanced circuit model is developed for a 60-GHz single-pole single-throw (SPST) switch in 65nm CMOS technology in this paper. The enhanced circuit model involves the modeling of the drain-to-source parasitic capacitances that are introduced by the overlapped multi-finger drain-to-source metallization of the transistors and also the modeling the distributive and coupling effect of lines interconnection,...
This paper describes guide-wave characteristics of graphene based waveguides. The model of graphene conductivity is derived at first. The guided wave and the characteristics of PEC-graphene and graphene-graphene waveguides are studies in details with boundary condition defined. The dispersion equation is then derived by solving the Maxwell's equations. The propagation constant is shown with the transverse...
A microstrip grid array antenna consisting of 32 meshes is designed on Ferro A6M LTCC substrate of 0.19 mm thickness with 5.9 dielectric constant and 0.002 loss tangent. The antenna is designed to operate at 94 GHz with the mesh dimension of 0.81mm by 1.62mm. Simulation results in Ansoft HFSS show an impedance bandwidth of 8 GHz from 87 GHz–95 GHz and 17.3 dBi gain at 94 GHz. A main beam in the broadside...
This paper presents the design of a 24 GHz microstrip grid array antenna excited by capacitive coupling slot on Rogers 5880 substrate. The dimension of the antenna is 70mm×70mm×0.787mm. The capacitive coupling slot of 15mm×0.3mm is located in the middle of the ground plane. Simulation results in Ansoft HFSS indicate that its 10 dB impedance bandwidth is 2.95 GHz from 22 GHz to 24.95 GHz, the maximal...
Future broadband mobile communication networks such as 5G and beyond will most likely use millimeter-wave frequencies. There is, however, little knowledge about millimeter-wave antenna design for cellular mobile devices. This paper reports a microstrip grid array antenna on an FR4 substrate in a standard PCB technology. It is shown that the microstrip grid array antenna covers a footprint of 15×15...
A microstrip grid array antenna is designed at 24 GHz on a single-layer RT/duriod 5880 substrate with a thickness of 0.31 mm. Simulated results show that the microstrip grid array antenna achieved a 10-dB impedance bandwidth of 210MHz, a 3-dB gain bandwidth of 500-MHz, and the maximum gain of 30.1 dBi at 24.15 GHz.
This paper briefly overviews the research and development (R&D) of antennas and computational electromagnetics in public research institutions in Singapore. The R&D activities of local universities and research institutes in particular, from Agency of Science, Technology and Research (A*STAR) in these areas are briefed with the selected projects from 10 MHz to 10 THz.
This paper presents a high-gain microstrip (MS) grid array antenna (GAA) on low temperature co-fired ceramic (LTCC). The high-gain MS GAA includes four sub-antennas. Dimensions of the sub-antenna are 15 × 15 × 0.5 mm3, which is composed of four sub-arrays. Preliminarily tested results show that the sub-antenna features fractional impedance bandwidth (BW) 58 – 60 GHz and 62 – 63.5 GHz, 3-dB gain BW...
This paper presents a high-gain grid array antenna (GAA) on FERRO A6M low temperature co-fired ceramic (LTCC) for 60-GHz antenna-in-package (AiP) applications. The high-gain GAA includes four sub-antennas. Dimensions of the sub-antenna are 15 × 15 × 1 mm3, which is composed of four subarrays. Measured results show that the sub-antenna features impedance bandwidth (BW) 50 – 65.6 GHz, 3-dB gain BW 58...
A microstrip (MS) grid array antenna (GAA) is designed for 60-GHz applications. The GAA adopts four sub arrays as the radiator and quarter-wave matched T-junctions as the feeding network. Ferro A6M low temperature co-fired ceramic (LTCC) is used as the antenna substrate. Measured results show that the impedance bandwidth (BW) of the GAA is 57.5–62 GHz (or 7.5% at 60 GHz), the 3-dB gain BW is 57.5–65...
A tri-band antenna in a package for single-chip WLAN/60GHz radio is proposed. It comprises a 60GHz grid array antenna and a dual-band monopole meander line antenna. It can be fabricated in LTCC. The size of the package is 15×15×0.67 mm3.
In this paper, a novel dual-band antenna for wireless local area networks (WLAN) application is designed and simulated. Firstly, a standalone dual-band antenna on a smaller PCB is designed and satisfactory radiation patterns at 2.4 GHz and 5.2 GHz are achieved. Then, the antenna is integrated on a larger PCB and it is found that the radiation patterns become unsatisfactory, in particular at 5.2 GHz...
This paper proposes a new n-network-based single-pole-four-throw (SP4T) switch with inherent ESD protection for 60-GHz applications, which achieves a small core area of 274 (im × 262 (im with a 1.2-V 65-nm bulk CMOS RF process. At 60 GHz, the proposed switch exhibits a simulated performance of 3.4-dB insertion loss, 25.7-dB isolation between Ant 1 and Ant 2/3/4, and 43-dB isolation between Ant 2 and...
A microstrip grid array antenna for 24 GHz Doppler sensor is proposed for the first time. It is designed on 0.787 mm thick Rogers Duroid 5880 (εr = 2.2 and tan δ = 0.0009) with 0.017 mm copper cladding. Wet etch PCB process is used to fabricate the grid array antenna for cost consideration. Dimensions of the antenna are 40 mm × 40 mm × 0.787 mm. Simulated results show that impedance bandwidth of the...
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