RU1788564C - Shf generator - Google Patents

Abstract

Usage: the invention relates to radio engineering, and more specifically to microwave generators, and is intended to create self-oscillators of small and medium power level and short-wave part of the microwave range, with electric frequency tuning. SUMMARY OF THE INVENTION: the generator comprises a metal base 1 on which a transistor 2 and a vector diode and a dielectric substrate 4 are mounted, on the front surface of which there is a first strip segment 5, the first end of which is connected to the input electrode of transistor 2, and the second end is the output of the generator. a third strip segment 7, the first end of which is connected to a varactor diode, and a dielectric resonator 8. A hole is made in the dielectric substrate 4, the first and third strip segments 5 and 7 are placed along its edge, and in the metal base 1, in the area under the hole and the first and third segments 5 and 7, a rectangular recess 10 with a flat bottom is made on which a dielectric resonator 8 is mounted on the inserted dielectric plate 11, the dimensions of the recess 10 and the thickness dielectric plate 11 is selected in accordance with the above recommendations. 1 C.p. f-ls, 2 ill. (L C

Description

V

v4 00 00 CL ON

The invention relates to radio engineering and is intended for the creation of low and medium power level oscillators in the short-wave part of the microwave range, which are electrically tuned for frequency and intended for use in REA for various functional purposes.

The aim of the invention is to increase the operating frequency.

In FIG. 1 shows a microwave generator; in FIG. 2 is a section AA in FIG. 1.

The microwave generator contains a metal base 1 on which a transistor 2 and a varactor diode 3 and a dielectric substrate 4 are mounted, on the front side of which there is a first strip segment 5, the first end of which is connected to the input electrode of the transistor 2, a second strip segment 6, the first end of which is connected to the output electrode of transistor 2, and the second end is the output of the generator, the third strip segment 7, the first end of which is connected to the second electrode of the varactor diode 3, a dielectric resonator 8, an opening 9 in the dielectric substrate 4, a rectangular recess 10 with a flat bottom in the metal base 1, on which a dielectric resonator 8 is mounted on the dielectric plate 11.

The microwave generator operates as follows ..

When power is applied to the transistor 2, electromagnetic oscillations occur in it, controlled by the resonant frequency of the dielectric resonator 9, electromagnetically coupled to the first strip segment 5. In this case, a self-oscillator with sequential feedback is realized. The resonant frequency of the dielectric resonator 8 is electrically tuned by a varactor diode 3 through the third strip section 7. Making holes 9 in the dielectric substrate 4, arranging the first and third segments 5 and 7 along its edge, making a rectangular notch 10 with a flat bottom in the metal base 1 under the hole in the first dielectric substrate 4 and the first and third segments 5 and 7 provides a strong electromagnetic coupling of the dielectric resonator 8 with the transistor 2 and the varactor diode 3, since the dielectric A tric resonator 8 is placed in the region of strong fields of the transmission lines formed by the first and third segments 5 and 7, the first dielectric substrate 4, the air gap defined by the rectangular recess 10 and its flat bottom. The removal of the dielectric resonator 8 from the metal base 1 due to the recess 10 and the dielectric plate 11 further increases the specified electromagnetic

coupling by increasing the effective quality factor of the dielectric resonator 8. This ensures the achievement of the goal. . -.

The choice of the dimensions of the rectangular recess 10 in the metal base 1 from one to five thicknesses of the dielectric substrate 4 and the thickness limits of the dielectric plate 11 from half to four thicknesses of the dielectric substrate 4 is set

experimentally in accordance with the limits of the range of the most effective regulation of the magnitude of the electromagnetic coupling of the dielectric resonator 8 with the formed transmission line type.

Based on the proposal, a microwave generator was created on the basis of the ZP-603 transistor with an operating frequency of 13700 MHz, an output power of 150 mW and an electrical tuning range of 0.5%, an efficiency of 10%, which

2 GHz is higher than that of the prototype, and the output power is 1.2-1.3 times larger, the range of electrical tuning is 1.5-2.5 times. The first and second dielectric plates - 0.5 mm, polycrust recess

- 2.5 mm.

The use of the proposal makes it possible to qualitatively improve the REA characteristics due to the replacement of diode microwave generators by transistor ones. In comparison with the industrially developed analog on the Gunn diode, the created transistor analog has by far the best efficiency.

40

Claims (2)

1. A microwave generator containing a metal base on which a transistor is mounted, a dielectric substrate with first and second strip segments placed on its front side connected to the input and output electrodes of the transistor, respectively, and a dielectric resonator located in a rectangular hole made in 0 metal base, while the second strip segment is located along one edge of the rectangular hole, characterized in that, in order to increase the operating frequency and output power, 5, a metal base in the region where the dielectric resonator is located has a rectangular recess, an inserted dielectric plate is inserted between the flat bottom of which and the bottom of the dielectric resonator, while the transverse dimension of the rectangular recess is greater than the sum of the transverse size of the rectangular hole and the width of the second strip conductor, its depth H and the thickness h of the dielectric plate are selected from the condition H (1-5) d, h (1 / 2-4) d. where d is the thickness of the dielectric substrate. 2. The generator according to claim 1, characterized in that, in order to provide a wide range of electrical frequency tuning, a varactor diode and a third strip segment connected to it are introduced, which is located along the other edge of the rectangular hole, and the transverse dimension of the rectangular recess increased by the width of the third strip segment. Ts 9 78 ° I. ///