Waveguide micro-strip line converter

Abstract

The invention provides a waveguide micro-strip line converter which comprises a double-face printing circuit board. Micro-strip lines (1) and a short circuit paster (2) are etched on a pattern on the upper layer of the double-face printing circuit board, a signal window is formed in a metal earth plate (5) arranged on the lower layer of the double-face printing circuit board, T-shaped gaps are formed in the rectangular side of the short circuit paster, the two micro-strip lines symmetrically stretch into a short circuit metal face through the T-shaped gaps in the two sides of the short circuit paster to form two micro-strip line ports, a dielectric substrate (3) with a metal via hole (4) is arranged between the upper layer pattern and the lower layer pattern, the metalation via hole formed between the upper layer pattern and the lower layer pattern of the double face printing circuit surrounds the edge of the signal window to form a ring-shaped gap opening ring, the ring-shaped gap opening ring, and the short circuit paster and an incentive oscillator (7) jointly form a rectangular metal cavity which is formed over a rectangular waveguide (8) and equivalent to a cavity filled with media, so that a load terminal of the rectangular waveguide is formed, and the load terminal and the two micro-strip line ports form the three-port converter. According to the converter, the problem that when an existing double-port waveguide micro-strip line converter forms a micro-strip array antenna, the loss is large is solved.

Description

technical field [0001] The invention relates to a transmission line circuit conversion applicable between a waveguide and a microstrip line working in the quasi-millimeter wave band, and can also be used for a microstrip antenna with waveguide feeding and the feeding structure of the array thereof. Especially suitable for microstrip array antenna waveguide microstrip line converter structure. Background technique [0002] In the prior art, in order to reduce the loss of the transmission line of the microstrip antenna or microstrip array antenna, a two-port waveguide microstrip line converter is often used between the microstrip antenna and the microwave transmission line. The two-port waveguide microstrip line converter It is a single-layer dielectric board microstrip line converter. At the bottom of the dielectric board is a metal grounding plate with a window. The size of the window is exactly the same as the size of the cavity connected to the rectangular waveguide. In t...

AI Technical Summary

Problems solved by technology

In the application of microstrip array antenna, the microstrip line from the waveguide microstrip line converter is usually connected to the microstrip line power division network. Since the array antenna needs to eliminate the grating lobes in the pattern, the unit spacing should not be too large. The array center of the two-dimensional planar array antenna often does not have enough space for arranging the above-mentioned waveguide microstrip line converter in the prior art, and the position of the waveguide microstrip line converter can only be moved from the center by a section of microstrip line for a certain distance or even at the edge of the front

Since it is transmitted to the center of the front through a section of microstrip line, and then the energy is distributed to each radiation unit through the microstrip power division network, which increases the system loss