CN221842529U - Differential oscillator based on rectangular substrate integrated waveguide - Google Patents

Abstract

The utility model relates to the technical field of oscillators, in particular to a differential oscillator based on a rectangular substrate integrated waveguide, which comprises a rectangular substrate integrated waveguide differential resonator, a first amplifying oscillation circuit and a second amplifying oscillation circuit, wherein the oscillator is designed through the rectangular substrate integrated waveguide, so that the phase noise of output signals of the two oscillators is lower; on the basis, two paths of oscillators are designed to share the same rectangular substrate integrated waveguide resonator, the two paths of oscillators are strongly coupled to form a coupled oscillator, the near-end phase noise of two paths of output signals can be reduced, the differential oscillator designed by utilizing the rectangular substrate integrated waveguide differential resonator is easy to integrate in a plane and miniaturize, the two paths of oscillators are completely symmetrical and share the rectangular substrate integrated waveguide resonator, the rectangular substrate integrated waveguide resonator has the characteristic of differential resonance, and the finally output signals can be ensured to be a pair of standard differential signals without additional phase compensation.

Description

A Differential Oscillator Based on Rectangular Substrate Integrated Waveguide

Technical Field

The utility model relates to the technical field of oscillators, in particular to a differential oscillator based on a rectangular substrate integrated waveguide.

Background Art

As the core device of RF microwave system, the phase noise and spurious of oscillator largely affect the bit error rate, transmission rate, detection accuracy and other performances of mobile communication, radar detection and other systems. However, with the development, the phase noise, spurious and flexibility of existing oscillators are gradually unable to meet the needs of microwave systems.

In order to optimize the oscillator phase noise, reduce spurious signals, and improve flexibility, the design of differential oscillators is carried out using dielectric resonators and metal waveguide cavity resonators with higher Q values. The differential oscillator outputs two reverse signals, which can better meet the needs of more application scenarios. Although the dielectric differential oscillator and the metal waveguide cavity differential oscillator have a good phase noise level, these oscillators are large in size, complex in structure, difficult to assemble and debug, and difficult to integrate with other planar circuits to achieve system miniaturization.

Therefore, it is very important to design a differential oscillator with simple structure, easy planar integration, excellent phase noise and high spurious suppression.

Utility Model Content

In view of the above problems, the utility model provides a differential oscillator based on a rectangular substrate integrated waveguide.

The adopted technical solution is a differential oscillator based on a rectangular substrate integrated waveguide, comprising a rectangular substrate integrated waveguide differential resonator, a first amplifying oscillation circuit and a second amplifying oscillation circuit;

The rectangular substrate integrated waveguide differential resonator is provided with four coupling feeder ports, namely coupling feeder port P1, coupling feeder port P2, coupling feeder port P3 and coupling feeder port P4;

The input end of the first amplifying oscillating loop is connected to the coupling feed line port P1 of the rectangular substrate integrated waveguide differential resonator, and the output end of the first amplifying oscillating loop is connected to the coupling feed line port P3 of the rectangular substrate integrated waveguide differential resonator;

The input end of the second amplifying oscillating loop is connected to the coupling feed line port P2 of the rectangular substrate integrated waveguide differential resonator, and the output end of the second amplifying oscillating loop is connected to the coupling feed line port P4 of the rectangular substrate integrated waveguide differential resonator.

Further, the first amplifying oscillation circuit includes a first amplifying unit, a first power divider and a first phase shifter;

The signal input end of the first amplifying unit is connected to the coupled feeder port P1 of the rectangular substrate integrated waveguide differential resonator, and the signal output end of the first amplifying unit is connected to the signal input end of the first power divider;

The signal output end of the first power divider is connected to the signal input end of the first phase shifter;

The signal output end of the first phase shifter is connected to the coupling feed line port P3 of the rectangular substrate integrated waveguide differential resonator.

Optionally, the second amplifying oscillation circuit includes a second amplifying unit, a second power divider and a second phase shifter.

The signal input end of the second amplifying unit is connected to the coupled feeder port P2 of the rectangular substrate integrated waveguide differential resonator, and the signal output end of the second amplifying unit is connected to the signal input end of the second power divider;

The signal output end of the second power divider is connected to the signal input end of the second phase shifter;

The signal output end of the second phase shifter is connected to the coupling feed line port P4 of the rectangular substrate integrated waveguide differential resonator.

Furthermore, the first amplifying oscillation loop and the second amplifying oscillation loop are symmetrically distributed about the central axis of the long side of the rectangular substrate integrated waveguide differential resonator.

Optionally, the rectangular substrate integrated waveguide differential resonator includes a dielectric substrate, a metal layer circuit, a metal reference ground plane, and a metallized through hole array;

The metal layer circuit is arranged on the upper surface of the dielectric substrate;

The metal reference ground plane is arranged on the lower surface of the dielectric substrate;

The metallized through hole array forms a substrate integrated waveguide resonant cavity, surrounds the metal layer circuit, and leads out a coupled feeder port P1, a coupled feeder port P2, a coupled feeder port P3 and a coupled feeder port P4.

Furthermore, the coupled feed line port P1 and the coupled feed line port P3, and the coupled feed line port P2 and the coupled feed line port P4 are symmetrical about the central axis of the long side of the rectangular substrate integrated waveguide differential resonator.

The beneficial effects of the present utility model include at least one of the following:

1. The oscillator is designed by using a rectangular substrate integrated waveguide with a high Q value, so that the phase noise of the output signals of the two oscillators is low; on this basis, the two oscillations are designed to share the same rectangular substrate integrated waveguide resonator. At this time, there is a strong coupling between the two oscillations to form a coupled oscillator, which can reduce the 3dB near-end phase noise of the two output signals.

2. The substrate integrated waveguide is a planar transmission structure that is easy to integrate and miniaturize. Therefore, the differential oscillator designed using the rectangular substrate integrated waveguide differential resonator is easy to planar integrate and miniaturize.

3. By setting the two oscillators to be completely symmetrical and share a rectangular substrate integrated waveguide resonator, and the operating frequency of the oscillation circuit is at the high-order mode resonance frequency of the rectangular substrate integrated waveguide resonator, the rectangular substrate integrated waveguide resonator has the characteristics of differential resonance, so it can ensure that the final output signal is a pair of standard differential signals, and no additional phase compensation is required.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a differential oscillator structure based on a rectangular substrate integrated waveguide;

FIG2 is a schematic diagram of a differential oscillator circuit based on a rectangular substrate integrated waveguide;

FIG3 is a schematic diagram of a rectangular substrate integrated waveguide differential resonator with dimension annotations;

FIG4 is a diagram showing the simulation results of the power comparison of two-way output signals;

FIG5 is a diagram showing the phase comparison simulation results of two-way output signals;

FIG6 is a simulation result diagram of phase noise comparison of two-way output signals;

FIG7 is a simulation result diagram showing the comparison of the output phase noise with the output phase noise of a common single-channel rectangular substrate integrated waveguide oscillator;

The figure marks are: 1 is a rectangular substrate integrated waveguide differential resonator, 2 is a first amplifying unit, 3 is a second amplifying unit, 4 is a first power divider, 5 is a second power divider, 6 is a first phase shifter, 7 is a second phase shifter, 01 is a dielectric substrate, 02 is a metal layer circuit, 03 is a metal reference ground plane, and 04 is a metalized through-hole array.

DETAILED DESCRIPTION

The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

As shown in FIG. 1 and FIG. 2 , a differential oscillator based on a rectangular substrate integrated waveguide includes a rectangular substrate integrated waveguide differential resonator 1, a first amplifying oscillation circuit and a second amplifying oscillation circuit;

The rectangular substrate integrated waveguide differential resonator 1 is provided with four coupling feeder ports, namely coupling feeder port P1, coupling feeder port P2, coupling feeder port P3 and coupling feeder port P4;

The input end of the first amplifying oscillating loop is connected to the coupling feed line port P1 of the rectangular substrate integrated waveguide differential resonator 1, and the output end of the first amplifying oscillating loop is connected to the coupling feed line port P3 of the rectangular substrate integrated waveguide differential resonator 1;

The input end of the second amplifying oscillation loop is connected to the coupling feed line port P2 of the rectangular substrate integrated waveguide differential resonator 1 , and the output end of the second amplifying oscillation loop is connected to the coupling feed line port P4 of the rectangular substrate integrated waveguide differential resonator 1 .

The purpose of this design is to design an oscillator through a rectangular substrate integrated waveguide with a high Q value, so that the phase noise of the output signals of the two oscillators is low; on this basis, the two oscillations are designed to share the same rectangular substrate integrated waveguide resonator, and at this time, there is a strong coupling between the two oscillations to form a coupled oscillator, which can reduce the 3dB near-end phase noise of the two output signals. The substrate integrated waveguide is a planar transmission structure that is easy to integrate and miniaturize. Therefore, the differential oscillator designed using a rectangular substrate integrated waveguide differential resonator is easy to planar integrate and miniaturize. By setting the two oscillators to be completely symmetrical and share a rectangular substrate integrated waveguide resonator, and the operating frequency of the oscillation circuit is at the high-order mode resonance frequency of the rectangular substrate integrated waveguide resonator, the rectangular substrate integrated waveguide resonator has the characteristics of differential resonance, so it can be ensured that the final output signal is a pair of standard differential signals, and no additional phase compensation is required.

In a specific connection, the first amplifying oscillating circuit includes a first amplifying unit 2, a first power distributor 4 and a first phase shifter 6;

The signal input end of the first amplifying unit 2 is connected to the coupling feeder port P1 of the rectangular substrate integrated waveguide differential resonator 1, and the signal output end of the first amplifying unit 2 is connected to the signal input end of the first power divider 4;

The signal output end of the first power distributor 4 is connected to the signal input end of the first phase shifter 6;

The signal output end of the first phase shifter 6 is connected to the coupling feed line port P3 of the rectangular substrate integrated waveguide differential resonator 1 .

The second amplifying oscillating circuit comprises a second amplifying unit 3, a second power divider 5 and a second phase shifter 7;

The signal input end of the second amplifying unit 3 is connected to the coupling feed line port P2 of the rectangular substrate integrated waveguide differential resonator 1, and the signal output end of the second amplifying unit 3 is connected to the signal input end of the second power divider 5;

The signal output end of the second power distributor 5 is connected to the signal input end of the second phase shifter 7;

The signal output end of the second phase shifter 7 is connected to the coupling feed line port P4 of the rectangular substrate integrated waveguide differential resonator 1 .

The first amplifying unit 2 and the second amplifying unit 3 are amplifiers of model GVA-93+ from Mini-Circuits, the first power divider 4 and the second power divider 5 are couplers of model DCW-11-722+ from Mini-Circuits, and the first phase shifter 6 and the second phase shifter 7 are phase shifters of model HMC247 from ADI.

As shown in FIG3 , the length of the rectangular substrate integrated waveguide differential resonator 1 is L, and the width is W. The hole spacing on both sides of the metallized through hole array 04 in the width direction is a, the hole spacing on both sides in the length direction is b, the diameter of the metallized through hole is d, and the distance between the metallized through holes is p. The high-order mode resonant frequency of the rectangular substrate integrated waveguide differential resonator 1 can be changed by changing the size of a and b. Usually, b/a is controlled to be around 1.65. The TE201 mode or TE102 mode resonant frequency can be calculated by the following formula:

Where c is the speed of light in a vacuum and _εr is the relative dielectric constant of the dielectric substrate.

In the present embodiment, the dielectric substrate of the rectangular substrate integrated waveguide differential resonator 1 is 99.6% alumina ceramic, ε _r =9.8, the dielectric substrate thickness is 20 mil, L=16.7 mm, W=10.7 mm; a=10 mm, b=16 mm; d=0.5 mm, p=1 mm, and the high-order mode resonance frequency is about 7.67 GHz.

Meanwhile, in this embodiment, the rectangular substrate integrated waveguide differential resonator 1 includes a dielectric substrate 01, a metal layer circuit 02, a metal reference ground plane 03 and a metallized through hole array 04;

The metal layer circuit 02 is arranged on the upper surface of the dielectric substrate 01;

The metal reference ground plane 03 is arranged on the lower surface of the dielectric substrate 01;

The metallized through hole array 04 forms a substrate integrated waveguide resonant cavity, surrounds the metal layer circuit 02, and leads out a coupled feed line port P1, a coupled feed line port P2, a coupled feed line port P3 and a coupled feed line port P4. The coupled feed line port P1 and the coupled feed line port P3, and the coupled feed line port P2 and the coupled feed line port P4 are symmetrical about the central axis of the long side of the rectangular substrate integrated waveguide differential resonator 1.

The rectangular substrate integrated waveguide differential resonator 1, the first amplifying unit 2, the first power distributor 4, and the first phase shifter 6 form a first oscillation circuit; the rectangular substrate integrated waveguide differential resonator 1, the second amplifying unit 3, the second power distributor 5, and the second phase shifter 7 form a second oscillation circuit; the two oscillation circuits share the same resonator and are completely symmetrical. The first amplifying unit 2 and the second amplifying unit 3 ensure that the initial gain of the oscillation circuit is greater than 1, the first phase shifter 6 and the second phase shifter 7 ensure that the oscillation circuit satisfies 0° or 360°, and the rectangular substrate integrated waveguide differential resonator 1 has the characteristic of reducing the phase shift amount with the frequency change at the resonance point, which ensures the oscillation circuit to start and stabilize.

Finally, a first oscillation circuit output signal Pout_P is obtained at the first output end of the first power divider 4 , and a second oscillation circuit output signal Pout_N is obtained at the first output end of the second power divider 5 .

As shown in FIG. 4 to FIG. 7 , it can be seen from FIG. 4 that the output signal power of the first oscillation circuit is the same as the output signal power of the second oscillation circuit;

It can be seen from FIG5 that the phase of the output signal of the first oscillation circuit is 180° different from the phase of the output signal of the second oscillation circuit, and the two signals are in opposite directions;

From Figure 6, we can see that at a frequency offset of 1MHz, the phase noise is -151.6dBc/Hz;

From FIG. 7 , it can be seen that the differential oscillator based on the rectangular substrate integrated waveguide provided in this embodiment can optimize the phase noise within a frequency deviation of several tens of MHz, and the phase noise is optimized by about 3dB within a frequency deviation of 1 MHz.

Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The differential oscillator based on the rectangular substrate integrated waveguide is characterized by comprising a rectangular substrate integrated waveguide differential resonator (1), a first amplifying oscillation loop and a second amplifying oscillation loop;

four coupling feeder ports are arranged on the rectangular substrate integrated waveguide differential resonator (1), and the four coupling feeder ports are a coupling feeder port P1, a coupling feeder port P2, a coupling feeder port P3 and a coupling feeder port P4 respectively;

The input end of the first amplifying oscillation circuit is connected with the coupling feeder line port P1 of the rectangular substrate integrated waveguide differential resonator (1), and the output end of the first amplifying oscillation circuit is connected with the coupling feeder line port P3 of the rectangular substrate integrated waveguide differential resonator (1);

The input end of the second amplification oscillation circuit is connected with the coupling feeder line port P2 of the rectangular substrate integrated waveguide differential resonator (1), and the output end of the second amplification oscillation circuit is connected with the coupling feeder line port P4 of the rectangular substrate integrated waveguide differential resonator (1).

2. The differential oscillator based on the rectangular substrate integrated waveguide according to claim 1, wherein the first amplifying tank circuit comprises a first amplifying unit (2), a first power divider (4) and a first phase shifter (6);

The signal input end of the first amplifying unit (2) is connected with the coupling feeder line port P1 of the rectangular substrate integrated waveguide differential resonator (1), and the signal output end of the first amplifying unit (2) is connected with the signal input end of the first power distributor (4);

the signal output end of the first power divider (4) is connected with the signal input end of the first phase shifter (6);

And the signal output end of the first phase shifter (6) is connected with the coupling feeder line port P3 of the rectangular substrate integrated waveguide differential resonator (1).

3. The differential oscillator based on the rectangular substrate integrated waveguide according to claim 1, wherein the second amplifying tank circuit comprises a second amplifying unit (3), a second power divider (5) and a second phase shifter (7);

The signal input end of the second amplifying unit (3) is connected with the coupling feeder line port P2 of the rectangular substrate integrated waveguide differential resonator (1), and the signal output end of the second amplifying unit (3) is connected with the signal input end of the second power distributor (5);

the signal output end of the second power divider (5) is connected with the signal input end of the second phase shifter (7);

And the signal output end of the second phase shifter (7) is connected with the coupling feeder line port P4 of the rectangular substrate integrated waveguide differential resonator (1).

4. The differential oscillator based on the rectangular substrate integrated waveguide according to claim 1, wherein the first amplifying tank circuit and the second amplifying tank circuit are symmetrically distributed about a long-side central axis of the rectangular substrate integrated waveguide differential resonator (1).

5. The differential oscillator based on the rectangular substrate integrated waveguide according to claim 1, wherein the rectangular substrate integrated waveguide differential resonator (1) comprises a dielectric substrate (01), a metal layer circuit (02), a metal reference ground plane (03) and a metallized through hole array (04);

the metal layer circuit (02) is arranged on the upper surface of the dielectric substrate (01);

the metal reference ground plane (03) is arranged on the lower surface of the dielectric substrate (01);

The metallized through hole array (04) encloses a substrate integrated waveguide resonant cavity, surrounds the metal layer circuit (02), and leads out the coupling feeder port P1, the coupling feeder port P2, the coupling feeder port P3 and the coupling feeder port P4.

6. The differential oscillator based on the rectangular substrate integrated waveguide according to claim 5, wherein the coupling feeder port P1 and the coupling feeder port P3, the coupling feeder port P2 and the coupling feeder port P4 are respectively symmetrical with respect to a long-side central axis of the rectangular substrate integrated waveguide differential resonator (1).