JPH0343802B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotationally symmetrical microstrip antenna constituting a planar or spherical phased array antenna, and a hybrid ring circuit directly below each antenna element. The present invention relates to a phased array antenna suitable for circularly polarized wave excitation with two-point feeding.

[Conventional technology]

Each antenna element of a phased array antenna using a conventional hybrid ring circuit was configured separately from the hybrid ring circuit.

[Problem that the invention seeks to solve]

Since each antenna element and hybrid ring circuit are configured separately, it is necessary to consider the grounding method of the hybrid ring circuit board, and when considering the space occupied by the hybrid ring circuit, the antenna system itself becomes heavier and larger. There were flaws.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an efficient fixation of a hybrid ring circuit for circularly polarized wave excitation for each antenna element of a phased array antenna.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention arranges a board of a circularly polarized wave excitation eyelid ring circuit on the back side of a conductor plate directly under each antenna element, and connects the antenna element through a hole provided in the center of the board. The antenna was constructed so that it penetrated through a grounding post connected to the center and fixed the hybrid ring board by the grounding post.

[Effect]

Hybrid ring circuits have no circuit elements at all in the center of the circuit, and can be modified to fix the antenna element in the center.
Since it is grounded and used, it can be used in common for grounding the hybrid ring circuit, so there is no need to separately consider a method for fixing the hybrid ring circuit, and moreover, efficient fixing can be achieved [Example] Hereinafter, the present invention will be described. An example of this will be described with reference to the drawings.

Figures 1 to 3 are shown to facilitate understanding of the embodiment; Figure 1 is a perspective view showing the attachment of the antenna element to the mounting conductor; Figure 2 is a sketch of the antenna element; FIG. 3 is a front view thereof. These symbols are the same as the numbers shown in the following examples, so their explanation will be omitted.

FIG. 5 and FIG. 6 are diagrams showing an embodiment of the present invention.

Antenna element 1 with fixing bolt 6 and nut 4
is fixed to the mounting conductor 3, and at the same time, the hybrid ring circuit board 2 for two-point circularly polarized wave excitation is fixed. The hybrid ring circuit is fixed at the center of the circuit as shown in Fig. 4, the input end 22 is connected to a connector 26, the termination end 23 is grounded via a chip resistor 27, and the output ends 24 and 25 are connected to the power supply transmission line using bonding wires. It is configured to be tied at 29. Because this hybrid ring circuit has a 90° phase difference, two
Circularly polarized waves can be generated by feeding directional power on two straight lines 13 and 14 that are perpendicular to each other at the center of the antenna element and at two points equidistant from the center. The distance from the center is related to the impedance of the antenna element.
Define it so that it matches the power supply system.

Generally, the entire back side of a hybrid ring circuit is grounded, so by fixing the back side 8 of the board (the side without the circuit pattern) in contact with the mounting conductor, you can ground the antenna element and ground the hybrid ring circuit. Grounding is also possible at the same time. Furthermore, by making the hybrid ring circuit board circular as shown in FIGS. 4 and 6, it is possible to ground the peripheral edge of the circuit board and fix the circuit board at the same time even with a spherical mounting conductor. FIG. 7 shows one type of phased array antenna in which an antenna element is fixed to a spherical mounting conductor.

According to the present invention, there is no need for new circuit board fixing jigs, fixing bolts, nuts, etc. for the hybrid circuit board.
Since the number of parts can be reduced by half, there is an effect of economicalization and weight reduction.
Furthermore, by having a hybrid ring circuit located closest to the antenna element, it is possible to minimize the length of the transmission line for two-point circularly polarized wave excitation.

In addition, since the antenna element and hybrid ring circuit are integrated, space can be used effectively.
Furthermore, it can be expected that the overall size of the phased array antenna will be reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram of the installation of the antenna element to the mounting conductor, Figs. 2 and 3 are the antenna elements, however, the former is a sketch and the latter is a front view, and Fig. 4 is a circularly polarized wave two-point excitation of an embodiment of the present invention. FIGS. 5 and 6 are diagrams showing how the antenna element is attached to the mounting conductor, and FIG. 7 is a diagram showing how the antenna element is attached to the mounting conductor, and FIG. 7 is a phased array antenna arranged on a spherical surface. 1... Antenna element, 11... Feeding point, 12...
...Fixing holes, 13, 14... Straight lines orthogonal at the center of the antenna element, 2... Hybrid ring circuit board, 21... Hybrid ring circuit pattern,
22...Input end, 23...Reflection-free termination, 24...
Input end (+90°), 25...Output end, 26...Input connector, 27...Chip resistor, 28...Earth area, 29...Bonding wire, 3...Mounting conductor, 31...Flat mounting Conductor, 32... Spherical mounting conductor, 4... Fixing nut, 5... Power supply transmission line,
6... Fixing bolt, 7... Antenna element support, 8... Conductor on the back of the hybrid ring circuit,
9... Dielectric material at the center of the hybrid ring circuit board, 10... Hole for power supply transmission line.

Claims (1)

[Claims] 1. In a phased array antenna consisting of a plurality of rotationally symmetrical microstrip antennas arranged on a flat or spherical conductor plate, a hybrid ring for circularly polarized wave excitation is placed on the back surface of the conductor plate directly under each antenna element. A circuit board is arranged, and a ground post connected to the center of the antenna element is passed through a hole provided in the center of the hybrid ring, and the hybrid ring board is fixed by the ground post. Phased array antenna.