JPS59122202A - Printed antenna - Google Patents

Abstract

PURPOSE:To radiate radio waves in a direction parallel to a printed board and opposed to a power supply circuit side by curving the shape of a wide thin film conductor on the power supply side, changing a distance from the end surface of the printed board and short-circuiting the printed board with an earth conductor. CONSTITUTION:The earth conductor 3 consisting of a thin film conductor is formed on one surface of the printed board 1, a wide thin film conductor 2 is formed on the other surface and a power supply line 4 consisting of a strip line is formed on one end of the conductor 2. An end surface Q on the opposite side of the power supply line 4 of the wide thin film conductor 2 is formed so as to be close to the end surface P of the printed board 1 and the shape of the power supply side R is curved to change the position of galvanized through holes 8. The printed board 1 is short-circuited with the earth conductor 3 through said through holes 8 and the end surface Q of the wide thin film conductor 2 almost coincides with the end surface P of the printed board 1, so that the electric field shown as 5 in the figure is formed and radio waves are radiated in the direction of (x).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed antenna using a printed circuit board.

A phased array antenna requires a small and lightweight element antenna. A printed antenna is an example of such an element antenna.

Figure 1 shows a conventional printed antenna. In Figure 1, (1) is a printed circuit board, (2) is a wide thin film conductor,
(3) is a ground conductor whose entire surface is made of a thin film conductor.

(4) is a feed line formed by a strip line, (5) is the direction of the electric field, 2 is a direction perpendicular to the printed circuit board, and X is a direction parallel to the printed circuit board and opposite to the feed line (4). This type of antenna radiates radio waves in two directions. This principle will be explained using FIG. 2. FIG. 2 is a side view of FIG. 1, and (1) is a printed circuit board.

(2) is a wide thin film conductor, (3) is a ground conductor whose entire surface is made of thin film conductor, (5a) and (5b) are the directions of the electric field, Z is the direction perpendicular to the printed circuit board, and X is parallel to the printed circuit board. In the direction opposite to the feed line (4) + ”Xa and Ex
b is the X component of the electric fields (5a) and (5b); similarly, Eza and Ezb are the Z component + Ha and Hb are the magnetic field components, which are perpendicular to the plane of the paper and directed outward from the plane of the paper. The energy of radio waves is expressed as the cross product of the electric and magnetic fields, so if the electric and magnetic fields are orthogonal, the radio waves will be radiated in a direction perpendicular to the plane created by the electric and magnetic fields, that is, in the Z direction.

Now, as shown in Figure 3, the phased array antenna consists of a module (6) made up of functional parts such as a phase shifter and an amplifier, and the aforementioned printed circuit board (1).

Wide thin film conductor (2), ground conductor (3) and feed line (4)
) consists of a printed antenna (7). In FIG. 3, (6) is the module, (7) is the printed antenna, al and a2 are the dimensions of the module, C is the connector that connects the module (6) and the printed antenna (7), and F is the feeding point.

When the aforementioned printed antenna is used in a 7-aided array antenna, the element spacing becomes narrow due to wide-angle beam scanning, so the dimensions a1 and a2 of the module must be made small, and module failure due to failure of module (6), etc. Due to the need for easy replacement, the size of the printed antenna (7) must be smaller than the dimensions a1 and a2 of the module. In that case, there are problems such as the following:

(1) Impedance matching becomes difficult due to restrictions on the position of the feeding point F.

(2) Depending on the position of the connector C, the printed antenna (7) may not fit within the module dimensions a1 and a2.

(3) Wide thin film conductor (The feed line connecting 2i and module (6) is short, so there is no space for matching.

Therefore, the present invention eliminates the above drawback by aligning the board surface of the conventional printed antenna with the longitudinal direction of the module (6), and radiates radio waves in a direction parallel to the printed board and opposite to the feed line. It was made in a similar manner.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a diagram showing one embodiment of the present invention.

In Fig. 4, (1) is a printed circuit board, (2) is a wide thin film conductor, (3) is a ground conductor whose entire surface is made of thin film conductor, (4) is a feed line formed by a strip line, and (5) is a ground conductor formed entirely of thin film conductors.
) is the direction of the electric field, (8) is the through-hole plating, X is the direction parallel to the printed circuit board and opposite to the power supply line, and y is the direction parallel to the printed circuit board and perpendicular to the X direction.

This is a wide thin film conductor (2) opposite the feed line (4).
) is brought close to the end surface of the printed circuit board (1), and the shape of the power supply side R of the two wide thin film conductors is made into a curve, and the position of through-hole plating is changed. Through-hole plating (8
), and the end face P of the wide thin film conductor and the end face Q of the printed circuit board are almost the same, so
An electric field as shown in (5) is generated and radio waves are radiated in the X direction. This principle will be explained using FIG. 5. Figure 5 is a cross-sectional view of Figure 4, and in Figure 2, (1) is a printed circuit board, (
2) is a wide thin film conductor, and (3) is a ground conductor whose entire surface is made of a thin film conductor.

(5) is the direction of the electric field, and Z is the direction perpendicular to the printed circuit board.

X is parallel to the printed circuit board and opposite to the power supply line.

EXC and BXe are the X component of the electric field 'Ezc+ "Zd
E:ze is the Z component of the electric field, and Hc, Hd, and H are the components of the magnetic field, which are perpendicular to the plane of the paper and directed into the plane of the paper. Since the energy of radio waves is expressed as the cross product of the electric field and the magnetic field, in the case of Fig. 5, the radio waves are radiated in a pattern with a wide beam width in the X direction. In addition, the shape of the power supply side R of the two wide thin film conductors is made into a curve, and through-hole plating (8) is applied.
By changing the position of the conductor and shorting it to the ground conductor, the resonance length is different, so it is possible to widen the band. Therefore, radio waves are radiated in a pattern with a wide beam width in a direction parallel to the printed circuit board and opposite to the feed line, and at the same time, the printed antenna has broadband properties.

Therefore, according to the present invention, the printed antenna shown in FIG. 4 can radiate radio waves in a direction parallel to the printed circuit board and opposite to the feed line, so that the printed circuit board surface and the longitudinal direction of the module can be aligned. Therefore, since impedance matching can be performed on the feed line (4) in FIG. 4, there is no restriction on the feed point, and since the space for matching is taken up in the longitudinal direction, there is no problem. In addition, unlike conventional antennas, there is no need to move the position of the connector for matching, so the module size can be kept within the range of A+ and A2, making the element antenna easy to configure and providing broadband performance. It becomes an antenna.

Note that 2 and above are cases in which the wide thin film conductor and the end face of the printed circuit board do not match, but the same applies even if they do, and the method of shorting is not limited to through-hole plating, but can also be 9 There is also a method of shorting the MIC line.

As described above, the printed antenna according to the present invention has the effect that radio waves can be radiated in a pattern with a wide beam width parallel to the printed circuit board and in a direction opposite to the feed line.

[Brief explanation of drawings]

Fig. 1 shows a conventional printed antenna, Fig. 2 shows the radio wave radiation principle of the printed antenna shown in Fig. 1, Fig. 3 shows the module and radiating element of the phased array antenna, Fig. 4 5 is a diagram showing an embodiment of the present invention, and FIG. 5 is a diagram showing the radio wave radiation principle of the printed antenna of FIG. 4. In fig. (1) is a printed antenna, (2) is a thin film conductor, (3)
is the ground conductor, (4) is the feed line, (5) is the direction of the electric field, (
6) is a module, 11/, (7) is a printed antenna, and (8) is through-hole plating. Note that the same or corresponding parts in FIG. 9 are denoted by the same reference numerals. Agent Makoto Kuzuno - Figure 1 Figure 2] Figure 3

Claims (1)

[Claims] A printed circuit board in which a ground conductor is formed by a thin film conductor on one side of the printed circuit board, a wide conductor is formed by a thin film conductor on the other side, and a power supply circuit is formed by a strip line at one end of the wide conductor. In the antenna, the end surface of the wide thin film conductor opposite to the feeding circuit side is brought close to the end surface of the printed circuit board, and the feeding side of the wide thin film conductor has a curved shape and is short-circuited from the end surface of the printed circuit board. By changing the distance to the ground conductor and shorting it to the ground conductor, a wave is generated parallel to the printed circuit board and in the opposite direction from the power supply circuit side. A printed antenna characterized by being configured to radiate radiation.