5G/mm-Wave Fully-Passive Dual Rotman Lens-Based Harmonic mmID for Long Range Microlocalization Over Wide Angular Ranges

Lynch, Charles A.; Adeyeye, Ajibayo; Eid, Aline; Hester, Jimmy; Tentzeris, Manos M.

doi:10.1109/tmtt.2022.3227925

Cited by 16 publications

(1 citation statement)

References 15 publications

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“…By multiplying the frequency of the received ramps by a factor N inside of this tag, they are, in theory, the only targets appearing when downconverting with this multiplied ramp at the radar system. The previous work is in line with other harmonic radar systems also based on N = 2 [6], [7], [8], [9], [10], [11], [12], [13], [14]. Advantageously, frequency doubling is easily realizable even at millimeter-wave (mmwave) frequencies by Gilbert-cells or push-pull-doublers [15].…”

Section: Introductionsupporting

confidence: 76%

Connecting the Automotive Bands of Present and Future With a Tag for Inharmonic Radar at 76–81/134–141 GHz

Braun,

Schöpfel,

Bredendiek

et al. 2024

IEEE Microw. Wireless Tech. Lett.

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Vulnerable road users like pedestrians, pedal-, and motorcyclists have accounted for an increasing proportion of traffic fatalities in the last 15 years. Simultaneously, harmonic radar systems have been implemented for applications where distinction between specific targets and surrounding clutter is required. However, the doubled frequencies conventionally used in harmonic radar systems are not licensed for automotive applications. Connecting the 76-81 GHz automotive band with the 134-141 GHz currently going through regulation instead necessitates what we propose to call inharmonic radar. Therefore, an innovative frequency modulation instead of doubling is required. This modulation is achieved and presented in this work with an active tag based on a novel 1.75 times fractional frequency multiplier. It successfully implements the required frequency conversion upward of -53 dBm of input power with undesired spectral components suppressed by more than 20 dB.

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