JPH0438565Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an array antenna in which a plurality of element antennas are arranged in a straight line.More specifically, this invention relates to improvement of coupling between elements of an array antenna. It is something.

[Conventional technology]

FIG. 2 is a diagram showing a conventional array antenna, in which 1a to 1d are first element antennas that resonate at a first frequency, and 2a to 2d are second element antennas that resonate at a second frequency. . FIG. 3 is a sectional view showing a rectangular microstrip antenna with one side shorted, which is this element antenna. In the figure, 3 is a dielectric substrate, 4 is a ground conductor, 5 is a radiator element, 6 is a short-circuit end, and 7 is a power supply connector.

The electric field distribution of this rectangular microstrip antenna short-circuited on one side is as shown in FIG. 4, and radio waves are radiated from the open end. Conventionally, as shown in FIG. 2, element antennas were arranged in a straight line with all short-circuited ends on the same side to form an array antenna.

[Problem that the invention attempts to solve]

However, when the element spacing is small and the first and second frequencies are close to each other, the difference in dimensions between the first element antenna and the second element antenna is small, and therefore the height of the substrate is reduced. If such restrictions are imposed, the open ends of adjacent elements from which radio waves are radiated will come close to each other, resulting in an increase in mutual coupling between the elements and deterioration of radiation characteristics.

This invention was made to solve this problem, and its purpose is to reduce mutual coupling between element antennas.

[Means for solving problems]

In the array antenna according to this invention, the open ends of the first element antenna and the second element antenna are opposed to each other, and the short-circuited ends are arranged in a staggered manner to constitute the array antenna.

[Effect]

With this idea, the distance between the open ends of adjacent elements from which radio waves are radiated can be made greater than when the shorted ends are arranged on the same side of the board.
It is possible to reduce the amount of mutual coupling between adjacent elements.

〔Example〕

FIG. 1 is a diagram showing an embodiment of this invention.
Reference numerals 1a to 1d designate first element antennas that resonate at a first frequency, and are arranged so that all short-circuited ends are located below the substrate. Second element antennas 2a to 2d resonate at a second frequency, and are arranged so that all short-circuited ends are above the substrate. The element antennas are all short-circuited rectangular microstrip antennas.

In the array antenna configured as above, even if the height of the board is limited and the element antennas must be placed close to each other, if the element antennas are arranged so that the shorted ends are on the same side of the board, In comparison, since the distance between the open ends of adjacent elements from which radio waves are radiated can be increased, mutual coupling between the elements can be reduced.

[Effect of idea]

As explained above, this idea uses short-circuited microstrip antennas as element antennas, and in an array antenna in which these elements are arranged in a straight line,
With an extremely simple structure in which adjacent elements are arranged so that the shorted ends are on the opposite side of the board,
This has the effect of reducing the amount of mutual coupling between elements.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of this invention, Fig. 2 shows a conventional array antenna, Fig. 3 is a cross-sectional view of a short-circuited rectangular microstrip antenna, which is an element antenna, and Fig. 4 FIG. 3 is a diagram showing the electric field distribution of a rectangular microstrip antenna with one end shorted. In the figure, 1a to 4a are first element antennas, 1b to 4b are second element antennas, 3 is a dielectric substrate, 4 is a ground conductor, 5 is a radiation conductor element, 6 is a short-circuited end, and 7 is a feed connector. be. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A dielectric substrate, a ground conductor provided on one side of the dielectric substrate, and a rectangular radiation provided on the other side of the dielectric substrate to face the ground conductor, one side of which is short-circuited to the ground conductor. A one-sided short-circuited rectangular microstrip antenna consisting of an element is used as a first element antenna that resonates at a first frequency and a second element antenna that resonates at a second frequency, and the first element In an array antenna formed by alternately arranging a plurality of antennas and the second element antenna, the open ends of the first element antenna group and the second element antenna group are opposed to each other, and the short-circuited ends are arranged. An array antenna characterized by a staggered arrangement.