JPS59122204A - 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 making the end surface opposed to the power supply circuit side of a wide thin film conductor close to the end surface of the printed board and short-circuiting the power supply circuit side 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 P 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 Q of the printed board 1 and galvanized through holes 8 are formed on the power supply circuit side. The printed board 1 is short-circuited with the earth conductor 3 through said through holes 8 and the end surface P of the wide thin film conductor 2 almost coincides with the end surface Q 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. An example of such an element antenna is a printed 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 thin film conductor, (4) is a feed line formed by a strip line, and (5) is an 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. Figure 2 is a cross-sectional view of Figure 1, where 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, (5a) and (5b)
is the direction of the electric field, 2 is the direction perpendicular to the printed circuit board, is the direction parallel to the printed circuit board and opposite to the feed line (4), E
xa & Exb are the X components of electric fields (5a) and (5b), and similarly Bza and Ezb are two components.

Out and field are magnetic field components, which are perpendicular to the page and point out of the page. 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 two directions, orthogonal to the plane created by the electric and magnetic fields.

Now, as shown in Figure 3, a phased array antenna is composed of functional parts such as a phase shifter and an amplifier. 3. It is composed of a module (6), a printed antenna (7) consisting of the aforementioned printed circuit board (1), a wide thin film conductor (2), a ground conductor (3) and a feed line (4). Third
In the figure, (6) is the module, (7) is the printed antenna r al , 32 is 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 above-mentioned printed antenna is used as a phased array antenna, the element spacing becomes narrow due to wide-angle beam scanning, so it is necessary to reduce the module dimensions (32), and there is a risk of module (6) failure. Due to the need for easy replacement, etc., the size of the printed antenna (7) must be smaller than the dimensions a1 and 32 of the module. In that case, the following problems arise.

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

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

(3) Since the feed line connecting the wide thin film conductor (2) and the module (6) is short, 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 transmits radio waves in a direction parallel to the printed board and opposite to the feed line. It is designed to radiate light.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 4 is a diagram showing an embodiment of the present invention. In FIG. 4, (1) is a printed circuit board, (2) is a wide thin film conductor, and (3) is a ground conductor whose entire surface is formed of a thin film conductor. ,(
4) is a power supply tll path using a strip line, (5)
H electric field direction, (8) is through-hole plating, X is parallel to the printed circuit board (1) and opposite direction to the feed line (4), y
is a direction parallel to the printed circuit board (1) and perpendicular to the It is something.

The thin film conductor (2) is short-circuited to the ground conductor by through-hole plating (8), and the end face P of the wide thin film conductor 5 almost coincides with the end face Q of the printed circuit board, so an electric field as shown in (5) is generated. occurs, and radio waves are radiated in the X direction. This principle will be explained using FIG. 5. FIG. 5 is a cross-sectional view of FIG. 4, and in FIG. 9, (1) is a printed circuit board, and (2) is a wide thin film conductor.

(3) is a ground conductor whose entire surface is made of a thin film conductor; (5)
is the direction of the electric field, 2 is the direction perpendicular to the printed circuit board (1),
X is parallel to the printed circuit board (1) and opposite to the feed line r &c and &e are the X components of the electric field g Bzcs&d and BZ
e is two components of the electric field p He r Hd and He are components of the magnetic field, which are perpendicular to one sheet of paper and directed into one sheet of paper. Since the energy of radio waves is expressed as the outer 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. Therefore, according to the second invention, the fourth
The printed antenna shown in the figure is parallel to the printed circuit board.

Since radio waves can be radiated in the direction opposite to the feed line, the printed circuit board surface and the longitudinal direction of the module can be aligned. Therefore.

Since impedance matching can be performed only on the feed line (4) in FIG. 4, there is no restriction on the feed point, and the space for matching is also taken up in the longitudinal direction, so there is no problem. Further, unlike conventional antennas, there is no need to move the position of the connector for matching, so the module dimensions can be kept within the range of a1 and a, which has the effect of simplifying the construction of the element antenna.

Note that 9 and above are cases where the wide thin film conductor and the end face of the printed circuit board do not match, but the same is true even if they do, and the method of shorting is not limited to through-hole plating, but also the method of driving a bottle, etc. .

A method of short-circuiting with the Ml and 0 lines may also be used.

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 is a diagram showing a conventional printed antenna. 2 is a diagram showing the radio wave radiation principle of the printed antenna shown in FIG. 1, FIG. 3 is a diagram showing the module and radiating element of the phased array antenna, and FIG. FIG. 5 is a diagram showing the radio wave radiation principle of the printed antenna shown in FIG. 4. In the figure, (1) is a printed circuit board, C21Vi thin film conductor, (3) is a ground conductor, (4) is a feed line, (5) is the direction of electric field, (6) is a module, (7) is a printed antenna, (8) is through-hole plating. Note that the same reference numerals are given to the same or corresponding parts in the figures. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A ground conductor is formed on one side of a printed circuit board using a thin film conductor, and a wide conductor is formed on the other side using a thin film conductor,
And in a printed antenna in which a feeder circuit is formed by a strip line at one end of the wide conductor, the end face of the wide conductor opposite to the feeder circuit side is brought close to the end face of the printed circuit board, and the feeder circuit of the wide conductor is placed close to the end face of the printed circuit board. By shorting the circuit side with the above ground conductor. A printed antenna characterized by being configured to be parallel to a printed circuit board and to radiate radio waves in a direction opposite to the feeding circuit side.