RF Pulse Transmitter Phase Adjustment for Leakage Reduction
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Solution Overview
Problem
Existing RF pulse signal transmitter apparatuses face challenges in reducing the relative amplitude of leakage signal components during pulse-off conditions without requiring additional expensive devices like switches and amplifiers.
Innovation Solution
A RF pulse signal transmitter apparatus with an array antenna and phase adjustment circuitry that alters the phase distribution of individual transmission signals during pulse-off intervals, ensuring the leakage signal component is not radiated with maximum intensity in the same direction as the transmission beam, thereby reducing noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switches and amplifiers are incorporated to reduce leakage signal amplitude, then the amplitude ratio of pulse-on to pulse-off portions is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the phase parameter of the RF pulse signal during pulse-off intervals to reduce leakage signal amplitude. By adjusting the phase distribution of individual transmission signals supplied to antenna elements, the system achieves better amplitude ratios without adding switches or amplifiers.
Solution Approach 2:
The patent replaces the mechanical/electrical switching system with a phase modulation approach. Instead of using physical switches and amplifiers to control signal amplitude, the system uses phase adjustment circuitry to achieve the same effect through electromagnetic field manipulation.
2Ease of operation
If phase distribution is maintained during pulse-off intervals, then device operation is simplified, but leakage signal radiates with maximum intensity in transmission direction causing noise
Solution Approach 1:
The patent changes the phase parameter during pulse-off intervals to redirect leakage signal radiation. By establishing a phase distribution different from the pulse-on condition, the system ensures leakage signals do not radiate with maximum intensity in the original transmission direction, thereby reducing noise.
Solution Approach 2:
The patent applies preliminary phase adjustment before the pulse-off interval begins. The phase distribution is changed in advance to prevent the leakage signal from radiating in the harmful direction, rather than attempting to correct the issue after radiation occurs.
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
This approach effectively reduces noise transmission during pulse-off intervals without the need for additional devices, enhancing transmission performance and reducing interference in transmitter/receiver systems.
Implementation Method 1
phase adjustment circuitry which is controlled to adjust the phase distribution of the individual transmission signals
Implementation Method 2
RF pulse signal supplying circuitry which supplies the RF pulse signal to be transmitted (as electromagnetic waves) by the antenna
Data Source
AI summary
A transmitter apparatus generates a RF pulse signal having alternating high-amplitude pulse-on intervals and low-amplitude pulse-off intervals, and supplies the RF pulse signal as respective individual transmission signals of antenna elements of an array antenna, with the individual transmission signals having a phase distribution during each pulse-on interval whereby a beam is transmitted from the antenna in a predetermined transmission direction. During each pulse-off interval, a different phase distribution is established for the individual transmission signals, thereby reducing the level of noise radiated in the transmission direction during each pulse-off interval.