SU1427447A2 - Shf circuit - Google Patents

Abstract

This invention relates to a microwave technique. The purpose of the invention is to improve the separation of types of oscillations and increase frequency stability when operating on the 1st overtone. The contour contains a transmission line segment (OLP) 1, one end of which is open, and the other is loaded with a capacitive load — capacitor 2, an open loop (RS) 3 connected to the end of OLP 1 loaded with a capacitive load. Introduced RSH 4, connected in parallel RSHZ to the OLP 1. 1 Il.

Description

(L

ND

four

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The invention relates to a microwave technique, can be used as a resonant circuit of generators and amplifiers, and is additional to the main author. St. No. 1394284.

The purpose of the invention is to improve the separation of types of oscillations and increase frequency stability when operating at the first overtone.

The drawing schematically shows a microwave circuit.

The microwave circuit contains segment 1 of the transmission line, one end of which is open and the other is loaded with a capacitive load — capacitor 2, open 3, connected in parallel to the end of segment 1 of the transmission line loaded with capacitive load, and an additional open loop 4 connected in parallel to segment 1 of the line transfer.

The considered lossless microwave circuit is a multiresonance system. Her rekhi - - ((al / Yl f2-)

sin (oil / V) cos ((x) ql / V) + mcos (u01 / V) sin (u) ql / V)

where W is the characteristic impedance of

ka 1 transmission line of length t; - relative length of open loop 3;

 - relative wave resistance of the open loop 3;

V is the propagation velocity of the electromagnetic wave

along segment 1 of the transmission line and the open loop 3. The presence of the open loop 3 reduces the frequency of the C02 oscillations of the first overtone to changes in capacitance C. The main contribution to instability is caused by a change in capacitance C, which is determined by the inadequacy of the power supply voltage and temperature.

4, CO 2

c-i speakers. Bc c

the presence of an open loop 3 stabilizes the frequency of co2. The greatest effect of co2 stabilization is achieved when the relative length of the open loop is 3 q 1/ 1/3 and q 3. 3. In these cases, the values of Sc are significantly reduced, regardless of the value of m (wm). The effect of stabilization 0) 2 increases with increasing m (decreasing Wm).

The resonant region of the microwave circuit at a frequency co, is bounded by zero oooi and adjacent

on the right there is a pole Pyr, the input co functions - (. X (co) –W. T, (on the resistance X (ш): сОо, ш, зр,. Effect D | S, i-DsicT-f-Doir

Reducing the sensitivity of the resonance frequency of the first overtone is due to the fact that, when and Q {3), the parallel-connected connected open loop device allows the division of oscillations and the low-frequency frequency to be stable on the first overtone. The tolerance of the additional open-loop open loop 3, the one {w is equal to Е / 3 (q the connection between them is equal to t / 3 X (u)) is written in the form

where O tg ((ot / 2v), a2 m + 3;

the resonant frequencies CO ;, i 1, 2, are the resonance equation

define -X (co,) 0,

(one)

where C is the capacitance of the capacitor 2, represented by ush, and the sum of the parasitic and output capacitances of the active element; X ((o) is the input impedance of the microwave circuit at the connection points of the capacitor 2.

From equation (1), it follows that the quality indicators of an oscillating system, such as frequency stability and separation of oscillation types, depend on the input impedance function X (ш).

The input resistance of segment 1 of the transmission line with open loop 3 is expressed by the ratio

The nanoscience region, W2b2d2, becomes very narrow — the frequencies soo2 and Sfr2 approach each other. However, the microwave circuit is characterized by a poor separation of the oscillations of the first and second overtones.

The separation of types of oscillations can be characterized by the relative removal of the working resonance region w; from the adjacent resonant regions w and co, i. Magnitude

RI SH02 / (iR |

(3)

characterizes the mutual removal of the resonant, regions of the main oscillation current (w |) and the first overtone (0) 2), and the value of Ng wo3 / Wp2 / a

characterizes the separation of the resonant regions of the first ((02) and second ((02) overtones.

The parallel connection of an additional open loop 4 in the proposed device allows to improve the separation of types of oscillations and to ensure high frequency stability when operating on the first overtone. Suppose that the parameters of the additional open loop 4 and open loop 3 are the same, the value {ш is equal to Е / 3 (q 1/3, the distance between them is equal to t / 3, then the function X (u)) is written as

(five)

where O tg ((ot / 2v), a2 m + 3;

1427447

34

34 m; frequency stability when working on it

bi 2m + 3; oscillation mode.

Claims (1)

Bm m + 4t + 1; claims   Microwave circuit on auth. St. No. 1394284, m W / Wii.otlichayush, i.is so that, in order to improve The analysis of expressions (3) - (5) shows the separation of the types of oscillations and that with the growth of the parameter m, the frequency stability improves when working on the allocation of modes of oscillation, as well as by reducing the overtone, to the segment of the transmission line The resonant region of oscillations is per-parallelly connected to an additional, equal overtone, which provides a high closed loop.