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A loaded antipodal linear tapered slot antenna (ALTSA) with a diamond-shaped slot is presented. The feed system is implemented using a substrate integrated waveguide (SIW), tapered microstrip-to-SIW transition and a horn-shaped via. The proposed antenna exhibits a return loss better than 18 dB over the band of interest (50–70 GHz) with a gain of 16.2 dB at the center frequency. The overall efficiency...
Radiating cable (leaky feeder) is an attractive transceiver for short range broadband wireless access envisioned in mm-wave bands. A leaky feeder having slot antennas along its axis is a natural beam forming transceiver that eliminates the need for separate multiple antennas. However, the traditional radiating cable has equally spaced slots that give higher sidelobe energy. In this paper, slot spacing...
Millimeter-wave antenna array Beam Forming Networks in Substrate Integrated Waveguide (SIW) technology are an attractive alternative to the use of TEM transmission lines, such as microstrip or stripline. SIW allows reducing the transmission losses while maintaining low price and simple, yet accurate, fabrication of the Printed Circuit Board technology. However, SIW design has additional restrictions...
This paper reviews the technology requirements of future mm-wave systems-on-chip and the challenges facing mm-wave MOSFET and SiGe HBT device and benchmark circuit scaling towards 3nm gate length and beyond 1.5THz fMAX. Measurements of state-of-the-art MOSFETs, HBTs and cascodes are presented from DC to 325 GHz. Finally, simulations of the scaling of the SiGe HBT mm-wave benchmark circuit performance...
Frequency domain scattering loss on small particles in terahertz frequency band (0.1–10 THz) is addressed. The wavelengths in THz band are short enough to enable scattering on small particles in the atmosphere. Rayleigh theories are utilized in estimating the scattering loss and it is shown that in proper conditions small particle scattering causes significant losses in the THz band. The small particle...
We present theoretical studies on an EBG line-defect waveguide which is formed in a two-dimensional (2D) slab, comprised of a square lattice of multi-layer metallic open square rings (OSRs). The waveguide is created by reducing the size of the layered rings to create a channel area. We compute the dispersion diagrams and the eigenfield distributions of the guided modes. It is shown that these guided...
This paper presents a compact sub-THz substrate integrated waveguide (SIW) interconnect that is designed in IBM 130 nm digital CMOS process. The footprint of the proposed SIW design is smaller than previous implementations through the application of a folded structure. The TE10 mode of the waveguide operation is excited using a current-loop excitation technique that imposes minimum layout area and...
The 26 GHz and 79 GHz UWB frequency bands are used for short-range radar applications for automobile. In this paper, single chip front-end ICs for both frequency bands are presented. The pulsed oscillator at 26 GHz can produce UWB short pulses. It consumes power only during short duty cycles; thus, it allows a power-efficient radar. A stereo radar, which comprises two synchronized radars, is demonstrated...
This paper presents a low cost high gain patch antenna array for automotive radar applications. A compact wide band (9.6GHz) low loss (0.5dB at 79GHz) micro-strip line to waveguide transition is also proposed for the antenna testing. The proposed antenna has a measured gain of 14.5dBi at 79GHz. The proposed antenna (including the transition) has been fabricated using a single dielectric layer PCB...
A novel phase shifter based on high impedance surface (HIS) with carbon nanotube (CNT) membrane MEMS is proposed. The CNT MEMS HIS is integrated into a dielectric rod waveguide (DRW) so that the CNT membrane acts as a movable ground plane. We present a novel fabrication method of the phase shifter being significantly simpler than those previously used. The device performance is verified through numerical...
Phase correction due to finite reflectarray (RA) antenna size and edge diffraction (ED) is proposed. The process is based on the numerical full wave analysis. The edge diffraction is mainly caused because of amplitude and phase ripples at sharp knife-edges of the outer perimeter of the RA antenna. The diffracted fields at the edges is diffracted in all directions resulting in disturbing the original...
A simple and low-cost solution to reduce the coupling between two slot antennas working at 60 GHz is presented. The slot antennas formed in the top plate of printed ridge gap waveguide (PRGW) structure to avoid the losses associated with conventional feeding mechanisms. The coupling reduction of more than 10 dB is achieved by removing a part of the top metallic plate of the PRGW between the two slots...
A Gaussian tapered post wall slotline antenna (TPWSA) is proposed for millimeter wave applications and a post wall fin-line (PWF) is devised for feeding the TPWSA. The post wall slotline (PWS) of the proposed antenna is composed of bilateral Gaussian tapered slotline with two metalized via arrays aligned at the slot edges. The PWS is connected to and fed by a novel transmission line, which is termed...
This paper presents and analyzes the results of medium range propagation channel measurements with and without the presence of a reflecting obstacle at 60 GHz. Root-Mean-Square (RMS) delay spread, path loss and signal intensity are investigated. A strong relationship is found between the use of a reflector and the received signal strength. An RMS delay spread is established to help identify a possibility...
In this paper, a 60 GHz power amplifier is presented in 65nm CMOS technology based on the transformerless load-modulated (TLLM) amplifier architecture. It is designed to obtain high efficiency at output power back-off. The amplifier has 12.5 dB small signal gain and 11.5 dBm saturated output power. Measurement results show that this amplifier has more than 8% drain efficiency (7% power-added efficiency)...
Millimeter wave identification (MMID) enables new improvement, such as the high number of different codes that can be ‘written’ on a tag, location sensing through narrow-beam antennas etc. In this paper novel compact chipless MMID tag is presented. The tag consists of a slot etched on the top of circular Substrate Integrated Waveguide (SIW) cavity. Reader concept based on frequency domain measurement...
Emerging millimeter-wave frequency applications require high performance, low-cost and compact devices and circuits. This is the reason why the Substrate Integrated Waveguide (SIW) technology, which combines some advantages of planar circuits and metallic waveguides, has focused a lot of attention in recent years. However, not all three-dimensional metallic waveguide devices and circuit are integrable...
In this paper, a novel broadband antenna array is presented. The radiating element is a unique via-fed U-shaped patch element with a distribution network based on offset stripline technology. The feed position has been deliberately designed for optimized matching taking into account the design rules of a low cost PCB mass production technology. The radiating element has a 3-dB beam-width of ±30 degrees...
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