| CPC H04B 1/18 (2013.01) [H03F 3/19 (2013.01); H04B 1/0078 (2013.01); H04B 1/04 (2013.01); H04B 1/1615 (2013.01); H03F 2200/451 (2013.01)] | 14 Claims |
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1. A radio frequency (RF) receiver, comprising:
a radiating element, arranged to receive an RF input signal to produce a plurality of electrical signals;
a chip having an amplifier circuit, wherein the amplifier circuit is configured to receive a plurality of phase shifted signals from a plurality of input terminals respectively, and amplify the phase shifted signals to generate an RF output signal; and
a phase shifting circuit, located outside the chip and coupled between the radiating element and the input terminals of the chip, the phase shifting circuit being arranged to receive the electrical signals produced by the radiating element, phase shift the electrical signals and accordingly generate the phase shifted signals, wherein the phase shifting circuit, arranged for receiving the electrical signals produced by the radiating element, and the radiating element are formed on a same substrate,
wherein the radiating element comprises:
a first feeding point, arranged to output a first electrical signal of the electrical signals; and
a second feeding point, arranged to output a second electrical signal of the electrical signals,
wherein the phase shifting circuit comprises:
a first phase shifting stage, coupled to the first feeding point, the first phase shifting stage being arranged to phase shift the first electrical signal to produce a first phase shifted signal and a second phase shifted signal of the phase shifted signals; and
a second phase shifting stage, coupled to the second feeding point, the second phase shifting stage being arranged phase shift the second electrical signal to produce a third phase shifted signal and a fourth phase shifted signal of the phase shifted signals,
wherein the amplifier circuit comprises:
a first amplifier path, configured to amplify the first phase shifted signal with a first gain value to generate a first amplified signal;
a second amplifier path, configured to amplify the second phase shifted signal with a second gain value to generate a second amplified signal;
a third amplifier path, configured to amplify the third phase shifted signal with a third gain value to generate a third amplified signal; and
a fourth amplifier path, configured to amplify the fourth phase shifted signal with a fourth gain value to generate a fourth amplified signal, wherein a combination of the first amplified signal, the second amplified signal, the third amplified signal and the fourth amplified signal serves as the RF output signal;
wherein when the RF input signal received by the radiating element is circularly polarized in one direction, the first gain value is opposite of the fourth gain value, and the second gain value is equal to the third gain value; when the RF input signal received by the radiating element is circularly polarized in another direction, the first gain value is equal to the fourth gain value, and the second gain value is equal to the third gain value.
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