Radar Transceiver Image Rejection Circuit 79 GHz
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Solution Overview
Problem
Existing radar transceivers face challenges in simultaneously transmitting and receiving upbeat and downbeat signals in the 79 GHz band due to difficulties in forming signals with close frequency bands, requiring complex configurations or long measurement times.
Innovation Solution
A radar transceiver that uses an image rejection circuit to form and transmit upbeat and downbeat signals from a carrier and chirp signal, and separates the received reflection signals into respective signals using the same circuit, allowing for simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bandpass filter is used to form upper and lower mixed signals, then signal separation is achieved, but formation of signals in close frequency bands (79 GHz band) becomes difficult
Solution Approach 1:
The patent introduces an image rejection circuit as an intermediary component that enables the formation of upper and lower mixed signals in close frequency bands (79 GHz band) without requiring complex bandpass filters. The image rejection circuit acts as a mediator between the mixer and the signal processing stages, allowing effective signal separation and formation in the challenging 79 GHz frequency range where traditional bandpass filtering becomes impractical.
2Device complexity
If upbeat and downbeat signals are transmitted in time division manner, then measurement time increases, but configuration remains simple
Solution Approach 1:
The patent merges the transmission of upbeat and downbeat signals into a simultaneous operation rather than time-division multiplexing. By using the image rejection circuit to properly form and separate both signals in the frequency domain, the system combines multiple functions (upbeat transmission, downbeat transmission, and their separation) into a single operational framework, achieving both short measurement time and manageable configuration complexity.
3Speed
If two systems of transmission circuit are used to form upbeat and downbeat signals, then simultaneous transmission is achieved, but device complexity increases
Solution Approach 1:
The patent makes a single transmission circuit multi-functional by using it to generate both upbeat and downbeat signals simultaneously. The image rejection circuit enables this single circuit to perform multiple functions (generating both signal types) that would traditionally require two separate circuits, thereby achieving simultaneous transmission while keeping the overall device complexity low.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the simple configuration of simultaneous transmission of upbeat and downbeat signals, overcoming the challenges of forming signals in close frequency bands and reducing measurement time, while maintaining sensitivity under adverse weather conditions.
Implementation Method 1
a transmission-signal forming section that forms the upbeat signal and the downbeat signal from a carrier signal and a chirp signal, using an image rejection circuit
Data Source
AI summary
A radar transceiver (100) includes: a transmission-signal forming section (110) that forms an upbeat signal and a downbeat signal from a carrier signal and a chirp signal, using an image rejection circuit; and a received-signal processing section (120) that separates a reflection signal received via a reception antenna (105) into a reflection signal based on the upbeat signal and a reflection signal based on the downbeat signal, using an image rejection circuit.