A compact manufacturable 76-77-GHz radar module for commercial ACC applications

Abstract

The design and measured results of a single-substrate transceiver module suitable for 76-77-GHz pulsed-Doppler radar applications are presented. Emphasis on ease of manufacture and cost reduction of commercial millimeter-wave systems is employed throughout as a design parameter. The importance of using predictive modeling techniques in understanding the robustness of the circuit design is stressed. Manufacturing techniques that conform to standard high-volume assembly constraints have been used. The packaged transceiver module, including three waveguide ports and intermediate-frequency output, measures 20 mm 22 mm 8 mm. The circuit is implemented using discrete GaAs/AlGaAs pseudomorphic high electron mobility transistors (pHEMTs), GaAs Schottky diodes, and varactor diodes, as well as GaAs p-i-n and pHEMT monolithic microwave integrated circuits mounted on a low-cost 127-m-thick glass substrate. A novel microstrip-to-waveguide transition is described to transform the planar microstrip signal into the waveguide launch. The module is integrated with a quasi-optical antenna. The measured performance of both the component parts and the complete radar transceiver module is described.

Bitstream radar waveforms for generic single-chip radar

“…Sachs [5] has written extensively on a M-sequence radar using SiGe BiCMOS technology. A growing application is automotive radars in the 60/70 GHz bands, where multiple single-chip solutions have been presented and some are commercially available [6], CMOS realizations in the literature include [7][8][9][10]. Several short-range radar systems are reported [11][12][13] indicating a number of potential sensing applications provided a compact, low-power, and highperformance radar is available; preferably in low-cost standard technology.…”

Performance Analysis of Mm Wave CPW Fed Antenna on Diverse Materials

“…The huge band offered by this technology represents great potentials in terms of capacity and flexibility making it particularly attractive for gigabit wireless applications. In other words it has recognized as having ability for broadband ultra-high-speed wireless communication systems such as Giga wireless LAN (Local area network) , Gigabit Ethernet networks [1], Wideband radio links for backhaul networking of cellular base stations [2] , automotive radar systems for 77 GHz [3] and inter-vehicle communication systems. Antennas involved in mm-wave systems mainly concerned in operating bandwidth , gain , radiation efficiency , technological reliability , compatibility with other radio frequency modules and cost.…”

Analysis and design of efficient passive components for the millimeter-wave and THz bands

“…Therefore, a decade of intense research activity drove mm-wave technology to the commercial revolution in the 2000s. Several works showed automotive radars systems ready to perform in practical environments [604], [625], [629]. By 2003, most of the car houses offered this kind of radars in their higher classes [605], and from the recent activity [605], [607], [630], [631], the incoming universal use of these systems is, simply, inevitable.…”

“…8.4, the bands highlighted with blue circles, [28][29][30][31][32][33][34][35][36][37][38] and , are those which present the lowest atmospheric propagation losses. Consequently they are projected for outdoor ap-plications, including mobile communications [601]- [602], Point-to-Point (P2P) highdata-rate links [608], [646], vehicular radars (mainly planned at f = 77 GHz) [605], [629], [649], radiometry (often using the minimum of absorption at f = 94 GHz) [650], [651], or imaging (also taking advantage of the atmospheric properties at f = 94 GHz) [638], [640]. On the other hand, the frequencies surrounding f = 60 GHz, marked with a green circle, present atmospheric attenuation as high as 20 dB/km.…”