Coupled waveguide microstrip transition structure with low insertion loss

Abstract

The invention belongs to the technical field of microwave transmission lines, and particularly provides a coupling type waveguide microstrip transition structure with low insertion loss, which is used for meeting the requirement of the transition structure for reducing radiation loss. The antenna comprises a lower-layer rectangular metal waveguide 1, a middle transition layer 2, a grounding metal plate 3, an upper-layer dielectric plate 4 and a rectangular metal patch which are sequentially stacked from bottom to top, and the rectangular metal patch is introduced to the upper surface of the upper-layer dielectric plate, so that the coupling energy is greatly improved, and meanwhile, the radiation energy is remarkably reduced; therefore, the transmission coefficient from the waveguide to the microstrip line is obviously improved, and a good port reflection characteristic is also maintained; meanwhile, the short-circuit probe is ingeniously applied, the influence of impedance mismatch caused by the short-circuit probe is counteracted while the rectangular metal patch effect is achieved, and impedance matching is achieved; moreover, compared with the prior art, the structure is simple, the processing difficulty is low, and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of microwave transmission lines, relates to a transition structure converted from a waveguide transmission line to a microstrip transmission line, and specifically provides a coupled waveguide microstrip transition structure with low insertion loss. Background technique [0002] With the rapid development of wireless communication technology and demand, antennas, as the key components that determine the performance of wireless systems, play a pivotal role; array antennas are in great demand in some long-distance communication scenarios due to their own high-gain characteristics; but in In some large antenna arrays, the loss on the feed transmission line cannot be underestimated, which greatly limits the improvement of the gain of the array antenna; therefore, the use of a transmission structure with lower loss has become an extremely effective way to improve the radiation efficiency and gain of the array ante...

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Problems solved by technology

[0002] With the rapid development of wireless communication technology and demand, antennas, as the key components that determine the performance of wireless systems, play a pivotal role; array antennas are in great demand in some long-distance communication scenarios due to their own high-gain characteristics; but in In some large antenna arrays, the loss on the feed transmission line cannot be underestimated, which greatly limits the improvement of the gain of the array antenna; therefore, the use of a transmission structure with lower loss has become an extremely effective way to improve the radiation efficiency and gain of the array antenna. method

[0003] For the feeding network of the array, there are usually unavoidable problems in the single-form feeding structure; although the waveguide transmission line has extremely low transmission loss, due to the limitation of the transmission mode, its own size is large; and for the microstrip For transmission lines, although they have smaller size and more flexible wiring, as the array size increases, the increase in line length will bring non-negligible losses

In order to have a compact structure and low insertion loss, a hybrid network of waveguide and microstrip line is often used in engineering to realize large-scale array feeding; this type of structure is a multi-layer structure, and the waveguide and microstrip are located on different layers. , energy is coupled from the waveguide to the microstrip line through a transition structure; however, since the microstrip line is an open transmission line, in the process of energy coupling from the waveguide to the microstrip line, there is inevitably a part of the energy coupled into the space , resulting in a certain radiation loss; therefore, how to reduce the radiation loss of the transition structure as much as possible while ensuring the integrity of the structural function has become a research focus of great significance and value.

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