Dual-band miniaturized digital phase shifter

Abstract

The invention discloses a dual-band miniaturized digital phase shifter, and belongs to the field of RFIC digital phase shifters. The dual-band miniaturized digital phase shifter comprises a switchingcircuit, an inductor structure with a variable coupling coefficient and two variable capacitor units, phase shift of input signals and output signals is achieved by switching on-off states of a firstswitch tube and a second switch tube in a switch circuit, coupling coefficients of a first inductor, a second inductor and a third inductor are changed by switching on-off states of a third switch tube in an inductor structure, and double frequency bands are achieved. According to the dual-band miniaturized digital phase shifter provided by the invention, an inductor structure with a variable coupling coefficient is adopted, dual bands are realized, and the two working bands can be mutually crossed or independent; meanwhile, the insertion loss of the phase shifter is reduced, the phase shift precision of the phase shifter in the embodiment is smaller than + / -0.37 degree, and the insertion loss is smaller than 3dB.

Description

technical field [0001] The invention relates to the field of RFIC digital phase shifters, in particular to a dual-band miniaturized digital phase shifter. Background technique [0002] The rapid development of modern satellite communication, aerospace technology and modern radar technology has made research on high-performance radio frequency communication components a top priority, and each phased array radar needs thousands of phase shifters to control the radiation on the antenna aperture surface. The phase change of the unit, and then realize the main lobe of the beam to effectively suppress the side lobe, fast scanning, and accurate positioning. Therefore, the phase shifter is a key module in the T / R component of the basic unit of the phased array system. According to the control method of the phase shifter, it can be divided into analog phase shifter and digital phase shifter. If the amount of phase shift controlled within a certain range changes continuously, it is ...

AI Technical Summary

Problems solved by technology

However, since the loaded linear phase shifter contains a λ / 4 line, when the operating frequency band of the phase shifter is a low frequency band, the λ / 4 line is very long and occupies a large amount of chip area

And the bandwidth of the single-band loaded linear phase shifter is narrower, less than 30%, and the number of switching elements of the dual-band loaded linear phase shifter is large, which deteriorates the insertion loss and bandwidth of the phase shifter, making its two operating frequency bands wider. narrow

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