JPH0733346Y2 - Antenna switching matrix device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an antenna switching matrix (hereinafter referred to as antenna matrix) device for connecting a plurality of radios and a plurality of antennas in an arbitrary combination.

(Prior Art) Conventionally, in this type of device, a relay and a switch having an expensive coaxial structure are connected in a matrix by a coaxial tube or a coaxial cable, so that the cost is very high. For this reason, inexpensive relays and switches used in general-purpose power supply circuits such as those shown in Fig. 3 are used as simple antenna matrices in the medium-wave band and short-wave band where the frequency is not as high as the left. Then there was something that was configured. In FIG. 3, X1 to X4 are connection points of wireless devices, A1 to
A4 represents a connection point of the antenna, and forms a 4 × 4 matrix composed of four rows on the X side and four columns on the A side. S11 ~ S
Reference numeral 44 denotes a switch or relay contact, which is mounted on the intersection of each matrix to connect the row and the column, and is one of the switches existing on one row or one column. By turning on only the switch, it is possible to connect any combination of radio and antenna.

(Problems to be solved by the invention) In an antenna matrix device that does not have such a coaxial configuration, if the antenna has a low impedance such as 50Ω or 75Ω, the wiring inductance of each matrix is the standing wave of the circuit. Aggravates the ratio (VSWR). Further, when each matrix is simple wiring, line leakage occurs due to the capacity between the matrices, and the isolation between the radios deteriorates, causing crosstalk. Further, when each element is simply wired in a plane as shown in FIG. 3 and relays are used for S11 to S44, the wiring for controlling the winding of each relay and the high frequency wiring forming each matrix are crossed with each other. There are problems such as interference.

(Means for Solving the Problems) In the present invention, two printed circuit boards forming each row and each column by a conductor pattern surrounded by a ground pattern and one printed circuit board on which a switch or a relay is wired are stacked in three stages. It is characterized by connecting wires, and its purpose is to obtain good isolation between each row and each column, and to lower the VSWR of the circuit and facilitate the wiring. Hereinafter, embodiments will be described in detail with reference to the drawings.

(Embodiment) FIG. 1 shows a part of the structure of the antenna matrix according to this embodiment. 1, a wireless device is connected. A printed circuit board having a conductor pattern of rows, a printed circuit board having a conductor pattern of a column to which an antenna is connected, a printed circuit board to which a relay or a switch is attached, a coaxial connector 4
A metal plate to which X1 to X4 and A1 to A4 are attached. 5
Is a conductor pattern in a row on the radio side, and 6 is a pattern in a column on the antenna side. The conductor patterns of the three printed circuit boards and the coaxial plugs on the metal plate 4 are vertically connected by wiring to form the same antenna matrix circuit as in FIG. FIG. 2 shows a printed circuit board 1 having a conductor pattern of rows.
FIG. 5 is a plan view of FIG. 5, 5 shows a conductor pattern, and 9 shows an earth pattern. The connection point 7 is connected to the coaxial connector which is the connection point of the wireless device by wiring, and the connection point 8 is connected to the switch or relay on the printed circuit board 3 by wiring. The printed circuit board forming the column on the side of the antenna shown by 2 in FIG. 1 also has the same structure as in FIG. Since the conductor patterns 5 and 6 in rows and columns on the printed circuit board are surrounded by the ground pattern 9, they have an electrostatic shield effect and an effect of preventing leakage between each row and each column. Further, since the distributed constant circuit is formed between the conductor patterns 5 and 6 and the ground pattern 9 by the distributed capacitance on the printed circuit board, there is an effect that the impedance characteristic of the circuit is improved.

Although the printed boards are shown separated from each other in the embodiment, they may be in contact with each other if necessary.

(Effect of the device) As described above, since each row and column is electrostatically shielded by the ground pattern on the printed circuit board, less crosstalk occurs between radios and antennas than with simple wiring. , In each row and column, the impedance characteristic of the circuit is improved by the distributed capacitance by the ground pattern on the printed circuit board, and VSWR can be lowered. Furthermore, S11 ~ S
The wiring for controlling the winding when a relay is used for 44 has an advantage that wiring can be performed on the printed circuit board 3.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of the device of the present invention, and FIG.
FIG. 1 is a plan view of the printed circuit board shown in FIG. 1, and FIG. 3 is a circuit diagram of a conventional simplified antenna matrix device for connecting four radios and four antennas. X1 to X4 …… Radio connection point, A1 to A4 …… Aerial connection point, S1
1 to S44 ... Switch or relay contact, 1 ... Printed circuit board with conductor pattern in the row to which the radio is connected, 2 ...
... Printed circuit board with conductor pattern in a row to which antenna is connected, 3 ... Printed circuit board with relay or switch attached, 4 ... Metal plate with coaxial plug attached, 5
...... Conductor pattern in the row on the radio side, 6 ...... Conductor pattern in the column on the antenna side, Radio connection point connected to the coaxial plug on the pattern 7 ... 5, On the pattern 8 ... 5 Point connected to switch or relay, 9 ... Ground pattern.

Claims (1)

[Scope of utility model registration request] 1. Two printed circuit boards (1) and (2) formed by conductor patterns (5) and (6) in which each row and each column of a matrix are individually surrounded by a ground pattern (9), and a row,
An antenna switching matrix device characterized in that a printed circuit board (3) having switches or relays for selecting a combination of columns arranged on a conductor pattern is connected in three layers.