RU112510U1 - DIRECTED TAP - Google Patents

Abstract

 A directional coupler consisting of an outer conductor, an inner conductor of the primary and inner conductor connected with the primary secondary line, characterized in that a recess is made in the inner part of the outer conductor, inside which the secondary line conductor is located, the end walls of the recess together with the outputs of the secondary line and load form a segment of a coaxial line with a slit.

Description

The invention relates to microwave technology, in particular, to power take-offs, and can be used in the feeder paths of communication technology, radar devices, television, and measuring equipment.

When developing microwave devices for measurements, there is a need to create a directional coupler having a high directivity, the possibility of tuning the transition attenuation without deterioration of directivity. At the same time, it should be simple to adjust and configure, and have small overall dimensions.

In this regard, directional couplers are characterized by a complex design, significant overall dimensions, complexity of adjustment and adjustment, due to the difficulty of implementing the complex of required electrical parameters in one device.

So, in a remote analogue of the claimed utility model, made in the form of a segment of a coaxial line with a two-stage inner conductor and a communication loop, movable shielding plates are placed between the inner conductor with a smaller diameter and a communication loop, forming a gap along the coaxial line (ed. St. USSR No. 192875 24a ⁴ , 73, IPC Н01Р, 1967).

The specified device has the following disadvantages:

- low manufacturability and structural complexity of the device, especially in terms of ensuring reliable contact between the housing and the movable shielding plates;

- large overall dimensions;

- low directivity due to the presence of inhomogeneities in the transition region (communication loop - secondary line output and communication loop - load output), causing excitation of spurious oscillation types (D.L. Matey, L.Yang, E.M.T.Jones Microwave filters , matching chains and communication chains, t.2, trans. from English, ed. "Communication" M. 1972.).

- the complexity of adjustment and adjustment. Reconfiguration of the transition attenuation is carried out by changing the distance between the inner conductor of the coaxial line and the communication loop or (and) the diameter of the communication conductor. The introduction of shielding plates changes the coupling coefficient only in the area of the inner conductor of smaller diameter.

A closer analogue, chosen as a prototype in connection with the similarity of the technical task being performed, is a directional coaxial coupler (ed. St. USSR No. 231641 24a ⁴ , 74, IPC Н01Р, 1968), consisting of a primary and associated secondary paths, moreover, the middle conductor of the primary line is placed between the end caps of the hollow metal cylinder, rigidly connected to each other by a metal rod, the central conductor of the secondary line is located inside the cylinder parallel to the Central conductor he primary line and the cylinder is made movable about an axis passing through the middle of the end caps.

However, this device also has the following disadvantages:

- low directivity due to the presence of inhomogeneities in the area of transitions (communication loop - secondary line output and communication loop - load), causing excitation of spurious oscillations;

- complex design.

The technical result of the proposed technical solution is to increase the directivity without complicating the design of the directional coupler at small weight and size indicators.

The specified technical result is achieved by the fact that in the directional coupler, consisting of an outer conductor, an inner conductor of the primary and inner conductor connected with the primary secondary line, a recess is made in the inner part of the outer conductor, inside which there is a conductor of the secondary line, and the end walls of the recess together with the exits secondary lines and loads form a segment of a coaxial line with a slit.

Figure 1 shows a schematic illustration of the proposed device.

The directional coupler (see Fig. 1) consists of an outer conductor 1, an inner conductor of the primary line 2 and an inner conductor of the secondary line 3, a recess 4 is made in the inner part of the outer conductor 1, inside which there is a conductor of the secondary line 2, and the end walls 5 of the recess 4 together with the outputs of the secondary line 6 and the load 7 form a segment of the coaxial line with a slit.

The directional coupler operates as follows.

A traveling wave propagating in a line formed by an inner conductor of the primary line 2 and an outer conductor 1 excites a traveling wave in the inner conductor of the secondary line 3 (Sazonov D.M. Gridin A.N. Mishustin B.A. Higher School microwave devices M .1981.). In this case, a part of the direct wave goes to the output of the secondary line 6, and the reflected wave goes to the output of the load 7. In this case, the end walls 5 of the recess 4 together with the outputs of the secondary line 6 and the load 7 form a segment of the coaxial line with a slit, dimensions (diameter, distance to the end walls of the recess, etc.) which are selected in such a way that the outputs of the secondary line 6 and the load 7 have a wave impedance equal to the wave impedance of the line formed by the inner conductor of the secondary line 3 and the outer conductor. Thus, at the junction in (communication loop - secondary line output and communication loop - load) there is no heterogeneity that causes the appearance of spurious oscillations. All this significantly increases the focus of the device. Reconfiguration of the transition attenuation occurs due to a change in the position of the inner conductor of the secondary line 3 relative to the inner conductor of the primary line 2. The directivity of the device does not deteriorate. At the same time, the directional coupler has a simple design and small overall dimensions.

At the filing date, a working model of a directional decimeter wavelength coupler was manufactured. Comparative tests of the inventive directional coupler and directional coupler with a smooth surface of the inner part of the outer conductor. Tests have shown that the inventive directional coupler has a simpler design due to the exclusion of some adjusting nodes and parts, smaller overall dimensions. The directionality of the claimed directional coupler increased by 15-20 dB, while the adjustment and adjustment were significantly simplified.

Claims (1)

A directional coupler consisting of an outer conductor, an inner conductor of the primary and inner conductor connected with the primary secondary line, characterized in that a recess is made in the inner part of the outer conductor, inside which the secondary line conductor is located, the end walls of the recess together with the outputs of the secondary line and load form a segment of a coaxial line with a gap.