# US 2013/0157591 A1 · RF Transceiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157591 A1 - Document ID: US20130157591A1 - Status: Published application - Kind: A1 - Application number: 13/437,186 - Filed: 2012-04-02 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense - Inventors: Chi-Ho Chang; Jui-Chi Huang; Jau-Chen Chen; Kuei-Ju Lee; Chi-Hua Tseng - Web page: https://patentgrep.com/patent/US20130157591A1 ## CPC - G01S 7/35: Details of non-pulse systems - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract A signal generation and transmission system includes a modulator and an RF transceiver. The RF transceiver includes a voltage-controlled oscillator, a power divider, a low-pass filter, a low-noise amplifier and a mixer. The voltage-controlled oscillator receives a signal from the modulator and produces a frequency modulated continuous wave signal. The power divider receives the frequency modulated continuous wave signal from the voltage-controlled oscillator. The low-pass filter receives the frequency modulated continuous wave signal from the power divider. The low-noise amplifier receives, amplifies and transfers a target echo signal. The mixer combines the frequency modulated continuous wave signal from the power divider with the echo signal of target from the low-noise amplifier so that the two signals are added up or subtracted from each other in a frequency band. ## Claims ### Claim 1 An RF transceiver for use in a signal generation and transmission system that includes a modulator 1 for controlling a voltage, wherein the RF transceiver includes: a voltage-controlled oscillator 21 for receiving a signal from the modulator 1 and accordingly producing a continuous oscillation frequency signal; a power divider 22 for receiving the frequency modulated continuous wave signal from the voltage-controlled oscillator 21; a low-pass filter 23 for receiving the frequency modulated continuous wave signal from the power divider 22, reducing high order harmonic frequency signals, enhancing the dominant signal within the low-pass filter, and transmitting the frequency modulated continuous wave signal within the pass-band to an RF transmitting end; a low-noise amplifier 24 for receiving, amplifying and transmitting an echo signal of target; and a mixer 25 for receiving the frequency modulated continuous wave signal from the power divider 22 and the echo signal of target from the low-noise amplifier 24 and combining the two signals with each other so that the two signals are added up or subtracted from each other in a frequency band. ### Claim 2 (depends on 1) The RF transceiver according to claim 1, wherein the power divider 22 is 1:1 power divider. ### Claim 3 (depends on 1) The RF transceiver according to claim 1, wherein the power divider 22 includes a first signal end, a second signal end and a third signal end. ### Claim 4 (depends on 3) The RF transceiver according to claim 3, wherein the first signal end of the power divider 22 is connected to the voltage-controlled oscillator 21. ### Claim 5 (depends on 3) The RF transceiver according to claim 3, wherein the second end of the power divider 22 is connected to an antenna. ### Claim 6 (depends on 3) The RF transceiver according to claim 3, wherein the third signal end of the power divider 22 is connected to the mixer 25. ### Claim 7 A method for reducing noises in an RF transmitter for use in a signal generation and transmission system that includes a modulator 1, wherein the method includes the steps of: providing a voltage-controlled oscillator 21 for receiving a signal from the modulator 1 and accordingly producing a frequency modulated continuous wave signal; providing a power divider 22 for receiving the frequency modulated continuous wave signal from the voltage-controlled oscillator 21; providing a low-pass filter 23 for receiving the frequency modulated continuous wave signal from the power divider 22, reducing high order harmonic frequency signals, enhancing the dominant signal within the low-pass filter, and transmitting the frequency modulated continuous wave signal within the pass-band to an RF antenna, wherein the low-pass filter 23 is designed by the microstrip mode; providing a low-noise amplifier 24 for receiving, amplifying and transmitting a target echo signal; and providing a mixer 25 for combining the frequency modulated continuous wave signal from the power divider 22 with the echo signal of target from the low-noise amplifier 24 so that the two signals are added up or subtracted from each other in a frequency band, wherein the microstrip-line impedance matching is executed with L-type and F-type matching elements or a ¼ wavelength matching element. ### Claim 8 (depends on 7) The RF transceiver according to claim 7, wherein the power divider 22 is 1:1 power divider. ### Claim 9 (depends on 7) The RF transceiver according to claim 7, wherein the power divider 22 includes a first signal end, a second signal end and a third signal end. ### Claim 10 (depends on 9) The RF transceiver according to claim 9, wherein the first signal end of the power divider 22 is connected to the voltage-controlled oscillator 21. ### Claim 11 (depends on 9) The RF transceiver according to claim 9, wherein the second end of the power divider 22 is connected to an antenna. ### Claim 12 (depends on 9) The RF transceiver according to claim 9, wherein the third signal end of the power divider 22 is connected to the mixer 25.