JPS63151202A - Microwave generator - Google Patents

Abstract

PURPOSE:To improve the efficiency of a multiple output by supplying a microwave of an opposite phase to both ends of a microstrip line from a microwave monolithic oscillator using an astable multivibrator and extracting an output from a point selected on the strip line. CONSTITUTION:Outputs 0, pi difference phase by 180 deg. from the microwave monolithic oscillator 1 is fed to feeding terminals 3, 3' at both ends of the microstrip line 2. Each effective length between an output terminal 4 and the terminals 3, 3' on the strip line is equal and an integral number of multiple of the wavelength of a fundamental wave of the microwave from the oscillator, the microwaves of the phases 0 and pi are canceled together at the terminal 4, the harmonic components of the oscillator having frequencies being an even number of multiple of the fundamental wave give the same phase and the harmonic components at the even number order are outputted from the terminal 4. In this case, the terminal 4 is short-circuited equivalently at the fundamental frequency, the impedance is 0 and the microwave from the oscillator is reflected toward the oscillator at this point thereby increasing the nonlinearity of the oscillator and decreasing the loss at the multiple waves. Moreover, in selecting said effective length, the output of a required frequency is obtained.

Description

[Detailed Description of the Invention] [Summary] Microwaves having a phase difference of 180 degrees from each other are supplied to both ends of a microstrip line from a microwave monolithic oscillator using an unstable multivibrator. By extracting the output from the point, the microwave was multiplied and output.

[Industrial application field]

The present invention relates to a microwave generator for obtaining microwaves of a higher frequency than the oscillation frequency of the microwave monolithic oscillator used.

[Conventional technology]

In conventional microwave generators that produce a multiplied output, the output frequency of the oscillator is multiplied by combining independent oscillators and multipliers, or by using the nonlinearity of the active elements that make up the oscillator. The output of the multiplied frequency is selected and extracted using, for example, a filter.

On the other hand, a microwave monolithic oscillator using an unstable multivibrator usually has two output terminals with different output phases, but in normal usage, only the output from one output terminal is used. , the output from the other output terminal is wasted.

[Problem that the invention seeks to solve]

Conventional microwave generators that use oscillator nonlinearity as described above have poor multiplication efficiency, and conventional techniques that use a combination of independent oscillators and multipliers have the drawback that the device configuration is complicated. was there.

An object of the present invention is to obtain a microwave generator that has good multiplication efficiency and effectively utilizes the two outputs of the above-mentioned microwave monolithic oscillator.

[Means for solving problems]

As shown in the principle diagram of FIG. 1, power supply terminals 3.3 are provided at both ends of a microstrip line 2 with outputs 0 and π having a phase difference of 180 degrees from each other from a microwave monolithic oscillator 1 using an unstable multivibrator. ', and a multiplied microwave output is obtained from an output terminal 4 provided at a selected point on the microstrip line.

[For production]

The effective length from the power supply terminal 3 to which the 0-phase output 0 from the oscillator 1 is supplied to the output terminal 4 and the π-phase output π of the oscillator 1
If the effective length L' from the feed terminal 3' to the output terminal 4 to which is supplied is equal, and this effective length is an integral multiple of the wavelength of the fundamental wave of the microwave oscillated by this oscillator, then
At the output terminal 4, the 0-phase microwave and the π-phase microwave cancel each other out, resulting in an output of O, but the harmonic components of the oscillator, which have frequencies that are even multiples of this fundamental wave, have the same phase. , even-order harmonics can be output from this output terminal 4.

At this time, the position of this output terminal 4 is isometrically short-circuited at the fundamental frequency, and the impedance is 0.
The microwave from the oscillator is reflected at this point and returned to the oscillator, increasing the nonlinearity of the oscillator and reducing multiplication loss.

〔Example〕

FIG. 2 shows an embodiment of the present invention, in which components corresponding to those in FIG. 1 are given the same reference numerals, and the oscillator 1 in FIG. The monolithic device 1' is shown divided into a monolithic device 1' including an unstable multivibrator 12, and a tuning circuit 1'' for determining the oscillation frequency of this multivibrator.

FET II, 11' are cross-connected to form monolithic element 1.
The oscillation frequency of the unstable multivibrator 12 configured within .21' and the equivalent impedance 23.23' of the conductor connecting the monolithic element 1.
It is determined by the impedance between the variable capacitance diode 13 and 13', which is provided in the oscillator and to which the frequency control voltage from the terminal 10 is applied to control the oscillation frequency of this oscillator. Note that the dielectric resonator coupling line 21.2
The resistor 24, 24' connected to the other end of 1' is an absorption resistor.

The output of the multivibrator 12 above is FETI4.14
A buffer amplifier constituted by a FET 15, 15' which operates as a resistor sends out microwaves from output terminals 16, 16' to the microstrip line 2 as O-phase and π-phase microwaves having mutually opposite phases.

This microstrip line 2 substantially constitutes two parallel conductor parts by a conductor 21, 21' connected to the output terminal 16, 16' of the oscillator, and a conductor 22 arranged parallel thereto, A connecting conductor 2 in which the conductors 21 and 22 and between the conductors 21' and 22 are constructed as separate bodies.
3, the line length can be selected by connecting at a required position. It goes without saying that the conductors of this parallel conductor section that are outside the connection point between the connection conductor 23 and the parallel conductor section need to be removed.

〔Effect of the invention〕

According to the present invention, an output at a frequency multiplied by the fundamental wave of the oscillator can be efficiently obtained with a simple configuration, and an output at a desired frequency can be obtained by selecting the effective length of the microstrip line. effect is achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, and FIG. 2 is a diagram showing an embodiment of the present invention. 1 is a microwave monolithic oscillator using an unstable multivibrator, 2 is a microstrip line, 3.3
' is a power supply terminal, and 4 is an output terminal. Raccoon dog (2) Figure 1

Claims (1)

[Claims] Outputs (0, π) with a phase difference of 180 degrees from a microwave monolithic oscillator (1) using an astable multivibrator are supplied to the power supply terminals (3, 3') provided at both ends of the microstrip line (2). and an output terminal (4) provided at a selected point on the microstrip line.
A microwave generator characterized in that it obtains a microwave output multiplied by .