CN114938203B - Duplex Phase-shifting Dielectric Oscillating Frequency Source with Impedance Matching at Two Frequency Points - Google Patents

Abstract

A duplex phase shift inference medium oscillation type frequency source with double frequency point impedance matching belongs to the technical field of frequency sources. The duplex phase-shifting propulsive dielectric oscillation type frequency source comprises a dielectric oscillation module working at a fundamental frequency, two identical first double-frequency point impedance matching modules and second double-frequency point impedance matching modules which are used for impedance matching at fundamental frequency and second harmonic frequency points, two identical first diplexer and second diplexer with pass bands covering the fundamental frequency and the second harmonic frequency points, two identical first phase shifter and second phase shifter working at the second harmonic frequency points and a combiner. The invention effectively improves the output power of the second harmonic by using the double-frequency point matching circuit, and ensures the smooth oscillation of the circuit; the diplexer is utilized to separate signals of different frequency points, so that the waste of fundamental wave signals is avoided, and the harmonic suppression is improved; the phase shifter is added to adjust the phases of the two paths of signals, so that the phase matching of the second harmonic is ensured, and the problem of phase deterioration caused by circuit difference is solved.

Description

Duplex Phase-shifting Dielectric Oscillating Frequency Source with Impedance Matching at Two Frequency Points

technical field

The invention belongs to the technical field of frequency sources, and in particular relates to a duplex phase-shifting medium-oscillating type frequency source for impedance matching of fundamental wave second harmonic and dual-frequency points.

Background technique

With the development of communication technology, radar and satellite communication technology have been widely used and technologically innovated in civil and military fields. Communication systems have higher and higher requirements for frequency sources. The requirements for indicators such as phase noise have been improved. In order to meet the demand, the researchers designed a push-push dielectric oscillator based on the direct oscillation dielectric oscillator.

The phase difference between the two fundamental oscillation signals generated by the dielectric oscillation module in the push-push oscillator is 180°. After being output by the nonlinear device, multiple harmonic signals will be generated in the two output signals, and the corresponding Even harmonics are in the same direction, and odd harmonics are in the opposite direction. Then the odd harmonics are canceled after the combination, and the even harmonics with enhanced output power. The push-push dielectric oscillator uses the push-push structure to reduce the phase noise on the one hand, and on the other hand to increase the output frequency and power by using the second harmonic combined output.

Only by ensuring that the phases of the second harmonics in the two signals are the same during the combination can the phase noise level of the output signal be improved and the generation of spurious signals reduced. This requires that the two channels are exactly the same and have the same phase shift. However, due to various factors, there are differences in devices, microstrip circuits, etc., resulting in differences in the phases of the two signals, which become the main factor limiting the phase noise performance of the oscillator; and the negative resistance transistor in the dielectric oscillation module is in the second The output impedance at the harmonic does not match, resulting in low power of the output signal of the second harmonic, which also limits the performance and application of the oscillator; in addition, the phase difference of the two fundamental wave signals is 180°, and the two signals after combining offset, which also causes a waste of fundamental signal energy.

Contents of the invention

The object of the present invention is to propose a duplex phase-shifting dielectric oscillation frequency source with dual-frequency point impedance matching in view of the problems existing in the background technology. The present invention effectively improves the output power of the second harmonic by using a dual-frequency point matching circuit, ensuring smooth oscillation of the circuit; using a duplexer to separate signals of different frequency points, avoiding the waste of fundamental wave signals, and improving harmonic Wave suppression; add an additional phase shifter to adjust the phase of the two signals to ensure that the second harmonic phase matches, thereby solving the problem of phase deterioration caused by circuit differences.

To achieve the above object, the technical scheme adopted in the present invention is as follows:

A dual-frequency point impedance matching duplex phase-shifting dielectric oscillation frequency source, including a dielectric oscillation module 1 working at the fundamental frequency, two identical, impedance matching at the fundamental frequency and the second harmonic frequency The first dual-frequency point impedance matching module 2 and the second dual-frequency point impedance matching module 3, two identical first duplexers 4 and second duplexers with passbands covering fundamental frequency and second harmonic frequency points device 5, two identical first phase shifters 6 and second phase shifters 7 operating at the second harmonic frequency point, and a combiner 8;

The dielectric oscillation module 1 includes a dielectric resonance module 11, a first negative resistance transistor module 12, and a second negative resistance transistor module 13. The dielectric resonance module 11 is composed of a dielectric column 01, a first coupling microstrip line 02, a second coupling microstrip line 03, the first matching load 04 and the second matching load 05, the first coupled microstrip line 02 and the second coupled microstrip line 03 are placed parallel and symmetrically about the dielectric column 01, and the dielectric column 01 is located on the first coupled microstrip line 02 Between the second coupled microstrip line 03; one end of the first coupled microstrip line 02 is connected to the first matching load 04, and the other end is connected to the input end of the first negative resistance transistor module 12; the second coupled microstrip One end of the line 03 is connected to the second matching load 05, and the other end is connected to the input end of the second negative resistance transistor module 13; the first matching load 04 and the second matching load 05 are grounded and located on the same side of the coupled microstrip line;

The output end of the first negative resistance transistor module 12 is connected to the input end of the first dual-frequency point impedance matching module 2, and the output end of the second negative resistance transistor module 13 is connected to the input end of the second dual-frequency point impedance matching module 3 Connected; the output end of the first dual-frequency point impedance matching module 2 is connected with the input end of the first duplexer 4, and the output end of the second dual-frequency point impedance matching module 3 is connected with the input end of the second duplexer 5; The high-frequency output terminal of the first duplexer 4 is connected to the input terminal of the first phase shifter 6, and the low-frequency output terminal of the first duplexer 4 is connected to a matching load; the high-frequency output terminal of the second duplexer 5 The output end is connected to the input end of the second phase shifter 7, and the low-frequency output end of the second duplexer 5 is connected to a matching load;

The output end of the first phase shifter 6 is connected with the first input end of the combiner 8, and the output end of the second phase shifter 7 is connected with the second input end of the combiner 8; the output of the combiner 8 Terminal is the signal output terminal.

Further, the first negative resistance transistor module 12 and the second negative resistance transistor module 13 are identical.

The present invention provides a duplex phase-shifting medium-oscillating frequency source with dual-frequency point impedance matching, and its working principle is as follows:

The two oscillation signals generated by the dielectric oscillation module are reversed (that is, the difference is 180°). After being amplified by the negative resistance transistor module, multiple harmonics will be generated. Therefore, the corresponding odd harmonics in the two amplified signals are reversed, even Subharmonics are in phase. The two-way signals are transmitted to the next-level circuit after passing through the dual-frequency point impedance matching module. Because of the function of the dual-frequency point impedance matching module, the maximum power of the fundamental wave and the second harmonic is transmitted to the next-level circuit, and the other sub-harmonics are transmitted to the next-level circuit. Primary circuit reflection. Therefore, a signal containing the fundamental wave and the second harmonic is obtained at the input end of the duplexer, and the corresponding fundamental wave is reversed and the second harmonic is in phase. After the signal passes through the duplexer, the fundamental wave signal and the second harmonic signal are separated, the fundamental wave signal is output to the matching load, and the second harmonic signal is input to the phase shifter for phase adjustment and combined. Only when the phases of the two signals are in the same phase when combined, can the output signal spurious and excellent phase noise performance be guaranteed. However, there are differences in the two circuits, resulting in different phases when the two signals are combined. The phase of the signal is adjusted. The final output has an ultra-low phase noise, power-boosted second harmonic signal.

The beneficial effects of the present invention are:

1. The present invention provides a dual-frequency point impedance matching duplex phase-shifting dielectric oscillation frequency source. The dual-frequency point impedance matching module ensures the smooth start-up of the dielectric oscillation module on the one hand, and on the other hand combines the dielectric oscillation module with the The next-stage circuit is matched at the fundamental frequency and the second harmonic frequency, which ensures the maximum power transmission of the fundamental wave and second harmonic signals to the next stage, and improves the output power of the second harmonic signal.

2. The present invention provides a duplex phase-shifting medium-oscillating frequency source with dual-frequency point impedance matching. A duplexer is used to separate the fundamental wave signal from the second harmonic signal, and the fundamental wave signal is connected to a matching load for further output. utilization while improving harmonic rejection.

3. The present invention provides a dual frequency point impedance matching duplex phase-shifting dielectric oscillation frequency source, which uses a phase shifter to adjust the phase of the two signals to ensure the phase of the second harmonic signal when the final combination The same, thereby solving the problems of phase noise and harmonic suppression deterioration caused by device and circuit differences.

Description of drawings

Fig. 1 is a structural representation of a duplex phase-shifting medium-oscillating frequency source of a dual-frequency point impedance matching of the present invention;

Fig. 2 is a schematic circuit diagram of an embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example

The embodiment is a duplex phase-shifting medium-oscillating frequency source for impedance matching of the second harmonic of the fundamental wave and dual-frequency points, and FIG. 2 is a schematic circuit diagram of the embodiment. The transistor models in the first negative resistance transistor module 12 and the second negative resistance transistor module 13 are BFU730F; the first dual-frequency point impedance matching module 2 and the second dual-frequency point impedance matching module 3 adopt a parallel multi-branch matching structure, Impedance matching can be performed at the fundamental wave and the second harmonic; the first duplexer 4 and the second duplexer 5 adopt a matching connection structure of two Chebyshev bandpass filters, and the passband covers the fundamental wave and the second harmonic Wave frequency point; the first phase shifter 6 and the second phase shifter 7 are reflective phase shifters based on branch line couplers, and the operating frequency covers the second harmonic frequency point; the combiner 8 is a Wilkinson power splitter, The working frequency band covers the second harmonic frequency point.

A duplex phase-shifting medium-oscillating frequency source for impedance matching of the second harmonic of the fundamental wave and dual-frequency points of the embodiment, the specific working process is as follows:

The first resonance signal V ₁ (t) and the second resonance signal V ₂ (t) generated by the dielectric resonance module 11 have the same amplitude, same frequency, and opposite phase, that is, the phase difference is 180°:

V ₁ (t)=a ₁ e ^jωt

V ₂ (t)=a ₁ e ^j(ωt-π)

When the resonant signals V ₁ (t), V ₂ (t) are respectively input to the first negative resistance transistor module 12 and the second negative resistance transistor module 13, the first negative resistance transistor module 12 and the second negative resistance transistor module 13 will be The output terminal of the resistive transistor module 13 obtains the oscillating and amplified first oscillating signal V _OSC1 (t) and the second oscillating signal V _OSC2 (t). Due to the nonlinearity of the transistor, the oscillating signal contains multiple harmonic signals, considering the phase shift brought by the transistor.

V _OSC1 (t)＝A ₁ e ^j(ωt+Δ121) +A ₂ e ^{j(2ωt+Δ122)} +A ₃ e ^{j(3ωt+Δ123)} +A ₄ e ^{j(4ωt+Δ124)} +…

Wherein, Δ121 , Δ122 , Δ123 , Δ124 . . . are phase shifts brought by the first negative resistance transistor module 12 .

V _OSC2 (t)＝A ₁ e ^{j(ωt-π+Δ131)} +A ₂ ^{e j[2(ωt-π)+Δ132]} +A ₃ e ^{j[3(ωt-π)+Δ133]} +A ₄ e ^{j[4(ωt-π)+Δ134]} +…

＝A ₁ e ^{j(ωt-π+Δ131)} +A ₂ e ^{j(2ωt+Δ132)} +A ₃ e ^{j(3ωt-π+Δ133)} +A ₄ e ^{j(4ωt+Δ134)} +…

Wherein, Δ131 , Δ132 , Δ133 , Δ134 . . . are phase shifts brought by the second negative resistance transistor module 13 . The presence of the first dual-frequency point impedance matching module 2 and the second dual-frequency point impedance matching module 3 not only ensures that the dielectric oscillation module 1 starts to vibrate smoothly at the fundamental frequency, but also connects the first negative resistance transistor module 12, the second The output terminals of the two negative resistance transistor modules 13 perform impedance matching with the input terminals of the first duplexer 4 and the second duplexer 5 respectively at the fundamental frequency and the second harmonic frequency, so as to ensure the oscillation signal V _OSC1 (t) , the fundamental wave signal and the second harmonic signal in V _OSC2 (t) are transmitted to the input terminals of the first duplexer 4 and the second duplexer 5 with maximum power. However, other harmonic signals cannot be transmitted to the input terminals of the first duplexer 4 and the second duplexer 5 due to circuit mismatch.

Considering the phase shift brought by the dual frequency point impedance matching module, the input signal V ₄ (t) is obtained at the input end of the first duplexer 4:

V ₄ (t)＝A ₁ e ^{j(ωt+Δ121+Δ21)} +A ₂ e ^{j(2ωt+Δ122+Δ22)}

Wherein, Δ21 and Δ22 are phase shifts brought by the first dual-frequency point impedance matching module 2 .

Similarly, the input signal V ₅ (t) is obtained at the input end of the second duplexer 5:

V ₅ (t)＝A ₁ e ^{j(ωt-π+Δ131+Δ31)} +A ₂ e ^{j(2ωt+Δ132+Δ32)}

Wherein, Δ31 and Δ32 are phase shifts brought by the second dual-frequency point impedance matching module 3 .

After the signal passes through the first duplexer 4 and the second duplexer 5, the fundamental wave and the second harmonic signal in the signal will be separated and obtained at the low frequency output terminals of the first duplexer 4 and the second duplexer 5 The fundamental wave signal, the second harmonic signal is obtained at the high-frequency output terminals of the duplexers 4 and 5 .

Considering the phase shift brought by the duplexer, the signal V ₄₁ (t) is obtained at the low frequency output end of the first duplexer 4, and the signal V ₄₂ (t) is obtained at the high frequency output end of the first duplexer 4:

V ₄₁ (t)=A ₁ e ^{j(ωt+Δ121+Δ21+Δ41)}

V ₄₂ (t)=A ₂ e ^{j(2ωt+Δ122+Δ22+Δ42)}

Wherein, Δ41 and Δ42 are phase shifts brought by the first duplexer 4 .

Similarly, the signal V ₅₁ (t) is obtained at the low frequency output end of the second duplexer 5, and the signal V ₅₂ (t) is obtained at the high frequency output end of the second duplexer 5:

V ₅₁ (t)=A ₁ e ^{j(ωt-π+Δ131+Δ31+Δ51)}

V ₅₂ (t)=A ₂ e ^{j(2ωt+Δ132+Δ32+Δ52)}

Wherein, Δ51 and Δ52 are phase shifts brought by the second duplexer 5 .

After the signals V ₄₂ (t) and V ₅₂ (t) are respectively input to the first phase shifter 6 and the second phase shifter 7, the output terminals of the first phase shifter 6 and the second phase shifter 7 will obtain signals V ₆ (t), V ₇ (t):

V ₆ (t)=A ₂ e ^{j(2ωt+Δ122+Δ22+Δ42+Δ6)}

Wherein, Δ6 is the phase shift brought by the first phase shifter 6 , which can be adjusted as required.

V ₇ (t)=A ₂ e ^{j(2ωt+Δ132+Δ32+Δ52+Δ7)}

Wherein, Δ7 is the phase shift brought by the second phase shifter 7 , which can be adjusted as required.

The signals V ₆ (t) and V ₇ (t) output by the phase shifter are input to the combiner 8 for combination, and the combiner 8 will also generate additional phase shifts for the two signals. Therefore, _the signal V 8 (t) obtained after the signals V ₆ (t) and V ₇ (t) are input to the combiner 8:

V ₈ (t)＝A ₂ e ^{j(2ωt+Δ122+Δ22+Δ42+Δ6+Δ81)} +A ₂ e ^{j(2ωt+Δ132+Δ32+Δ52+Δ7+Δ82)}

Among them, Δ81 and Δ82 are the phase shifts brought by the combiner 8 .

So the final phase difference is:

Δ=(Δ122+Δ22+Δ42+Δ6+Δ81)-(Δ132+Δ32+Δ52+Δ7+Δ82)

If the two devices are identical, the final phase difference Δ=0, that is, the two signals are in the same direction, so that the second harmonic signal with excellent phase noise will be obtained at the output end of the combiner 8 .

However, due to the difference and unbalance of the devices, the phase difference Δ≠0 results in poor signal quality after combining. At this time, the phase is adjusted by adjusting the phase shifters 6 and 7 to make the phase difference Δ=0, then the phases of the signal V ₈₁ (t) and the signal V ₈₂ (t) are the same, and the output signals are combined by the combiner 8 V _out (t) is:

V _out (t)＝2A ₂ e ^j(2ωt)

Finally, the second harmonic signal with ultra-low phase noise, high harmonic suppression and increased power is obtained.

The above-mentioned embodiments are only some embodiments of the present invention, but not all embodiments. With reference to the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Finally, it should be noted that the present invention is not limited to the above optional embodiments, and anyone can obtain other various forms of products under the enlightenment of the present invention. The above specific implementation methods should not be construed as limiting the protection scope of the present invention, and the protection scope of the present invention should be defined in the claims.

Claims (2)

1. The duplex phase-shifting propulsive dielectric oscillation type frequency source is characterized by comprising a dielectric oscillation module (1) working at a fundamental frequency, two identical first duplex point impedance matching modules (2) and second duplex point impedance matching modules (3) which are used for impedance matching at fundamental frequency and second harmonic frequency points, two identical first diplexer (4) and second diplexer (5) with pass bands covering the fundamental frequency and the second harmonic frequency points, two identical first phase shifter (6) and second phase shifter (7) working at the second harmonic frequency points and a combiner (8);

the dielectric oscillation module (1) comprises a dielectric resonance module (11), a first negative resistance transistor module (12) and a second negative resistance transistor module (13), wherein the dielectric resonance module (11) consists of a dielectric column (01), a first coupling microstrip line (02), a second coupling microstrip line (03), a first matching load (04) and a second matching load (05), the first coupling microstrip line (02) and the second coupling microstrip line (03) are symmetrically arranged in parallel relative to the dielectric column (01), and the dielectric column (01) is positioned between the first coupling microstrip line (02) and the second coupling microstrip line (03); one end of the first coupling microstrip line (02) is connected with a first matching load (04), and the other end of the first coupling microstrip line is connected with the input end of the first negative resistance transistor module (12); one end of the second coupling microstrip line (03) is connected with a second matching load (05), and the other end of the second coupling microstrip line is connected with the input end of the second negative resistance transistor module (13); the other ends of the first matching load (04) and the second matching load (05) are grounded;

the output end of the first negative resistance transistor module (12) is connected with the input end of the first double-frequency point impedance matching module (2), and the output end of the second negative resistance transistor module (13) is connected with the input end of the second double-frequency point impedance matching module (3); the output end of the first double-frequency point impedance matching module (2) is connected with the input end of the first duplexer (4), and the output end of the second double-frequency point impedance matching module (3) is connected with the input end of the second duplexer (5); the high-frequency output end of the first duplexer (4) is connected with the input end of the first phase shifter (6), and the low-frequency output end of the first duplexer (4) is connected with a matched load; the high-frequency output end of the second duplexer (5) is connected with the input end of the second phase shifter (7), and the low-frequency output end of the second duplexer (5) is connected with a matched load;

the output end of the first phase shifter (6) is connected with the first input end of the combiner (8), and the output end of the second phase shifter (7) is connected with the second input end of the combiner (8); the output end of the combiner (8) is a signal output end.

2. The dual-frequency point impedance-matched duplex phase-shifting propulsive dielectric oscillating-type frequency source according to claim 1, wherein the first negative resistance transistor module (12) and the second negative resistance transistor module (13) are identical.

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