Sapphire microwave oscillator with low phase noise

A microwave oscillator and sapphire technology, which is applied in the direction of single-port active network, etc., can solve the problems of large temperature drift coefficient of the resonant cavity, affecting the long-term stability of the sapphire resonant cavity, etc.

Active Publication Date: 2015-09-23
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the disadvantage of sapphire resonator is that the dielectric constant of sapphire crystal changes with temperature, which makes the temperature coefficient of sapphire resonator very high, and the drift of sapphire dielectric constant with temperature is relatively la

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  • Sapphire microwave oscillator with low phase noise
  • Sapphire microwave oscillator with low phase noise

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Embodiment Construction

[0014] In order to explain the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are denoted by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0015] Such as figure 1 , figure 2 As shown, a low-phase noise sapphire microwave oscillator includes: mixer 1, low-pass filter 2, power detector 3, integrating circuit 4, voltage-controlled phase shifter 5, manual phase shifter 6, microwave amplifier 7. Power coupler 8, microwave circulator 9, sapphire filter 10, temperature control circuit 11, in which sapphire filter 10 includes: vacuum cover 12, heating wire 13, metal shield cavity 14, sapphire crystal 15, vacuum maintenance component 16 .

[0016] The B port of the sapphire filter 10 is conne...

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Abstract

The invention discloses a sapphire microwave oscillator with low phase noise. The sapphire microwave oscillator comprises a mixer, a low pass filter, a power detector, a integral circuit, a voltage controlled phase shifter, a manual phase shifter, a microwave amplifier, a power coupler, a microwave circulator, a sapphire filter and a temperature control circuit, wherein the sapphire filter comprises an evacuated enclosure, a heating wire 13, a metallic shield chamber, a sapphire crystal and a vacuum maintaining subassembly. The microwave oscillator of the invention could obtain a stable high-frequency microwave signal with low phase noise under room temperature, and the phase noise of the microwave signal at the far-end is far higher than the index reached by crystal oscillator frequency doubling.

Description

Technical field [0001] The invention relates to a microwave oscillator. More specifically, it relates to a low phase noise sapphire microwave oscillator. Background technique [0002] Microwave frequency sources with low phase noise and high stability are widely used in radar, communication measurement and other fields. The traditional microwave source is generally obtained by multiple frequency multiplications of the crystal oscillator, but as the number of frequency multiplications increases, the phase noise (short-term stability) will become larger and larger, which means that the phase noise will increase with the carrier frequency. And increase. The low temperature (4k) sapphire microwave frequency source has extremely low phase noise (in the X band, <-160dBc / Hz10kHz) and excellent short-term stability ( <1E-151s). The microwave source formed by the sapphire high-Q filter can generate extremely low phase noise at high frequencies, which has a higher index than the h...

Claims

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Application Information

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IPC IPC(8): H03H11/46
Inventor 陈海波黄凯高连山
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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