CS229725B1 - Microstrip waveguide directional coupler with rectangular profile - Google Patents

Abstract

Directional tap with microstrip line for a circuit with a rectangular profile. The directional tap consists of a microstrip line with an odd multiple of the operating wavelength, where the first strip is formed by a part of the inner wall of the waveguide and the second strip is in the form of a thin strip, which is connected at its ends to the center conductors of the coaxial outputs, while the perpendicular distance of the first strip from the second strip is constant. The directional tap is schematically illustrated in Fig. 1.

Description

The invention relates to a waveguide directional coupler which is formed by a microstrip line having an odd multiple of a quarter of the operating wavelength.

Large waveguides are used to control waveguide paths with parallel or crossed waveguides. These couplings have poor frequency and isolation frequency characteristics in the frequency bands assigned to the directional links. When using measuring devices with coaxial inputs to check the routes, these couplings need to be supplemented by transitions from the waveguide to the coaxial connectors, further increasing the dimensions and deteriorating the performance of the measuring device.

The above-mentioned drawbacks are eliminated by a directional coupler with a microstrip line according to the invention, which is based on the fact that the first microstrip line tape is an odd multiple of a quarter of the operating wavelength. * The perpendicular distance between the first strip of the microstrip line and the second strip is constant over the entire length of the microstrip line.

The microstrip directional coupler according to the invention makes it possible to reduce the overall dimensions of the waveguide path measuring device and has a satisfactory characteristic over a wide frequency band.

1 shows a basic embodiment of a directional coupler according to the invention. Figure 2 shows a directional coupler with variable coupling.

229 72S

The microstrip directional coupler for the rectangular profile circuit according to the invention consists of a microstrip line 1 having an odd multiple of one quarter of the operating wavelength. The first microstrip strip 11 is formed by part of the inner wall of the waveguide 2 and is grounded.

The second strip 12 is not grounded and is galvanically connected at its ends by the center conductor of the coaxial output 3. Between the two tapes 11, 12 there is a solid dielectric that ensures the parallelism of these tapes.

• The derived design of the directional coupler differs from the basic one in that the first strip. 11 does not form part of the waveguide, but a conductive plate that moves in the opening 21 of the waveguide 2. In the conductive, grounded plate there are conductor holes that galvanically connect the second strip 12 to the middle conductors 3.

The energy coming from the waveguide 2 from the left is bound to the left end of the microstrip line 1 »If this line is long odd multiples / 4 it does not bind to the right end of the microstrip line 1. To form a directional coupler, one end of the microstrip line 1 needs to be terminated with a load. The load may be in chip or coaxial design or may be steamed to the end of the microstrip line 1 · The opposite end of the microstrip line 1 is operational · It may therefore be terminated by a coaxial connector or directly by an indicator, such as a diode chip.

The directional coupler according to the invention can be used, for example, for a waveguide type R70 with adjustable 20dB coupling, coaxial load, coaxial diode and coaxial output to the NB connector. For use on the R100 waveguide, for example, a fixed coupling setting, a chip load, a chip diode, and an output on the NB or OSM connector B ·

Claims (2)

SUBJECT OF THE INVENTION 229 725 1 # directional coupler with a microstrip line to waveguide of rectangular profile, characterized in that the first strap (11) • microstrip line (1) long odd multiple of one quarter the operating wavelength is formed by the part of the inner wall of the waveguide (2) ¹ and the second strap (12) of the microstrip line (1) is in the form of a thin strip which is connected at its ends to the middle conductors of the coaxial outlets (3), the perpendicular distance of the first strip (11) from the second strip (12) being constant. 2 »The microstrip directional coupler for the rectangular waveguide according to claim L, characterized in that the first strip (11) of the broadband line (1) is formed by a wall of electrically conductive material inserted in the opening (21) in the waveguide (2).