Differential feeding variable directivity slot antenna

Abstract

The present invention provides a differential feeding variable directivity slot antenna. Opposite ends open slot resonators (601, 605) having a slot length during an operation set to become one half of effective wavelength are operated by a differential feeder liner (103c) and a slot resonator group excited with a reverse phase / equal amplitude is made to emerge in the circuit, and arrangement conditions of the open end points of selective radiation parts (601b, 601c, 603b, 603c, 605b, 605c, 607b, 607c) in each slot structure are switched dynamically.

Description

technical field [0001] The invention relates to a differential feeding antenna for receiving and sending analog high-frequency signals or digital signals in microwave bands and millimeter wave bands. Background technique [0002] In recent years, with the rapid improvement of the characteristics of silicon-based transistors, not only in digital circuits, but also in analog high-frequency circuit units, the replacement of compound semiconductor transistors to silicon-based transistors is accelerating, and further, the realization of analog high-frequency circuit units Single chip with digital baseband unit. As a result, the single-ended circuit (single end circuit), which was once the mainstream of high-frequency circuits, is being replaced by a differential signal circuit that performs a balanced operation of signals with positive and negative signs. This is because the differential signal circuit has the advantages of significantly reducing unwanted radiation and ensuring ...

AI Technical Summary

Problems solved by technology

[0011] First, in Conventional Example 1, the main beam is oriented only in the ±Z-axis direction, and it is difficult to orient in the ±Y-axis direction and ±X-axis direction

In addition, in particular, since it cannot cope with differential feeding, a balanced-unbalanced conversion (balun) circuit is required for feeding signal conversion, which increases the number of elements and hinders integration.

[0012] Second, in Conventional Example 2, although a wide main beam is formed toward the +Y direction, it is difficult to form beams toward other directions

In addition, in particular, since it cannot cope with differential feeding, a balanced-unbalanced conversion (balun) circuit is required for feeding signal conversion, which increases the number of elements and hinders integration.

In addition, since the emission characteristics of conventional example 2 have a wide half-value width, it is difficult to avoid deterioration of communication quality.

For example, when the desired signal arrives from the negative Y direction, the reception strength of the unwanted signal coming from the +X direction cannot be suppressed

When performing high-speed communication in an indoor environment with many signal reflections, it is difficult to avoid serious multipath problems, or it is difficult to maintain communication quality under conditions where a large number of interference waves arrive

[0013] Third, as shown in Conventional Example 3, in the case of replacing only the feed by a single-ended line with a differential feed line, the half-wavelength slot resonator, quarter-wavelength slot resonator Only non-radiation characteristics can be obtained, and effective antenna operation is difficult

[0014] Fourth, in conventional example 4, it is difficult to realize the main beam orientation in the direction of ±Y axis

Moreover, if the differential line is bent, unnecessary in-phase signal reflections will occur due to the phase difference between the two wirings at the bent portion, so in Conventional Example 3, it is not possible to bend the feeder line to make the main beam direction bending such a solution

Thus, as an antenna on a mobile terminal for use in an indoor environment, it is extremely unsatisfactory to produce a direction in which the main beam direction cannot be oriented.

[0015] Fifth, the transmission characteristics of Conventional Example 4 have a wide half-value width, so it is difficult to avoid deterioration of communication quality

For example, when the desired signal arrives from the Z-axis direction, the reception strength of the unwanted signal coming from the +X direction cannot be suppressed

When performing high-speed communication in an indoor environment with many signal reflections, it is difficult to avoid serious multipath problems, or it is difficult to maintain communication quality under conditions where a large number of interference waves arrive

[0016] Fifth, in Conventional Example 5, similar to the fourth problem, it is also difficult to suppress the adverse effect on communication quality of unwanted signals arriving from a direction different from the direction in which the desired signal arrives.

That is, even if the orientation of the main beam direction can be controlled, there is a problem that interference waves cannot be sufficiently suppressed

Of course, the same as the first problem, can not deal with differential feeding

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