JPH06291536A - Slot coupling type micro strip antenna and plane circuit device - Google Patents

Abstract

PURPOSE:To make the device small in size and light in weight, and to eliminate coupling with a power feeding line of an antenna by shielding electromagnetically a high frequency signal for passing through the inside of a through-slot in a different ground conductor and a high frequency signal for passing through a different plane microwave line. CONSTITUTION:Between two ground conductor plates 11, 14 opposed to each other, two dielectric layers 21, 22 are filled. In this case, a slot is formed in the ground conductor plate 14 so that between the dielectric layers 21, 22, a different micro strip conductor 12 is inserted/provided and formed, and opposed to a slot formed in the ground conductor plate 11. Subsequently, the dielectric layers 21, 22 are eliminated and a slot 30 for passing through in the thickness direction between two slots is formed, and on the whole inside surface of the slot 30, a ground conductor 13 for connecting two ground conductor plates 11, 14 is formed and a through-slot 31 whose conductor part is grounded is formed. Also, a power feeding line to a radiation conductor 10, and a strip line containing the strip conductor 12 are shielded electromagnetically by the ground conductor plates 11, 14 and the through-slot 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot-coupling type microstrip antenna for transmitting and receiving signals in the microwave band, quasi-millimeter wave band or millimeter wave band of approximately 1 GHz or more, and a planar circuit device for transmitting the signals. Is.

[0002]

25 and 26 show a linear polarization slot-coupled microstrip antenna of a first conventional example. As shown in FIGS. 25 and 26, a dielectric substrate 23 having a microstrip conductor 15 formed on the back surface,
A grounding conductor plate 11 is sandwiched between a dielectric substrate 20 having a rectangular radiation conductor 10 formed in the center thereof, and a rectangular slot 30 is formed in the center of the grounding conductor plate 11.
Is formed immediately below the central portion of the microstrip conductor 10 so as to be three-dimensionally orthogonal to the longitudinal direction of the microstrip conductor 15 and parallel to one side of the rectangle of the radiation conductor 10. Here, the microstrip conductors 15 and the ground conductor plate 11 formed on both surfaces of the dielectric substrate 10 facing each other form a power supply microstrip line.

In the linear polarization slot-coupled microstrip antenna of the first conventional example, two rectangular slots are formed on the ground conductor plate 11 so that they are separated from each other and their longitudinal directions are orthogonal to each other. ,further,
A slot coupling type microstrip antenna for orthogonal polarization sharing (hereinafter, referred to as a second conventional example) in which two feedline microstrip conductors are formed on the back surface of the dielectric substrate 23 corresponding to each slot is known. ing. The second
In the conventional orthogonal polarization dual-use microstrip antenna, the two linearly polarized waves orthogonal to each other are used for transmission or reception, or one of them is used for transmission and the other is used for reception as a transmission / reception antenna. Can be used.

Further, for example, an MMI having an IF / RF frequency conversion circuit on the dielectric substrate on the back surface of the antenna device.
A planar circuit (hereinafter referred to as a third conventional example) provided with C (Microwave Monolithic Integrated Circuit) is known. In the third conventional example, in order to simplify the configuration of the MMIC, it is preferable that the frequency of the local oscillation signal be close to the transmission / reception signal frequency. For this reason,
In the millimeter wave band and the Ka band, the local oscillation signal supplied to the MMIC is also set to a frequency close to the transmission / reception signal passing through the feeding line of the antenna.

Furthermore, for example, in a planar circuit device formed by stacking two planar circuit boards (hereinafter referred to as a fourth conventional example), a microstrip line formed in one planar circuit and a planar circuit in the other planar circuit. In order to connect with the formed microstrip line, a method of electromagnetically connecting through a slot formed so as to be orthogonal to the microstrip conductor of each microstrip line and penetrate each substrate in the thickness direction is described. It is used.

[0006]

However, in the above-mentioned first conventional example, when another microstrip conductor is formed close to the back surface of the dielectric substrate 23 in the same manner as the microstrip conductor 15, the microstrip is formed. There is a problem in that the conductor 15 and the other microstrip conductor are electromagnetically coupled to each other, and the isolation between signals cannot be increased.

In the second conventional example, although the polarized waves are separated by utilizing the orthogonal modes on the radiation conductor 10, the two microstrip conductors for the feed line or the conductors thereof are separated. There is a problem that electromagnetic coupling occurs between the two slots and the isolation characteristics of the orthogonal polarization deteriorate. Further, when it is used as a transmission / reception shared antenna, a transmission signal may sneak into the receiver via the receiving line side, and intermodulation may occur in the receiver.

Further, in the third conventional example, electromagnetic coupling occurs between the signal line of the local oscillation signal and the RF signal transmission microstrip conductor or the IF signal transmission microstrip conductor, and There is a problem in that isolation between signals cannot be obtained and cross modulation occurs.

Furthermore, in the above-mentioned fourth conventional example, since electromagnetic coupling occurs between a plurality of slots, it is necessary to separate the slots from each other, which makes the device large and the planar circuit. There is a problem that the degree of freedom in circuit design and wiring layout in the device is reduced.

The first object of the present invention is to solve the above problems and to form a planar microwave line which is smaller and lighter than the conventional example and which is not coupled to the feed line of the antenna. Another object is to provide a slot-coupled microstrip antenna that can be used.

A second object of the present invention is to provide a planar circuit which is smaller and lighter than the conventional example and which can form another planar microwave line which is not coupled to one planar microwave line. To provide a device.

[0012]

A slot-coupled microstrip antenna according to a first aspect of the present invention has a slot formed in a ground conductor sandwiched between a first dielectric substrate and a second dielectric substrate. A slot-coupled microstrip that excites a radiation conductor formed on the second dielectric substrate using a high-frequency signal input to a planar microwave line formed on the first dielectric substrate via In the antenna, a pair of 2 facing each other is provided between the first and second dielectric substrates.
Two ground conductors are provided, and the second dielectric is provided from the first dielectric substrate via the two ground conductors so as to three-dimensionally intersect with the planar microwave line immediately below the radiation conductor. A through slot is formed that penetrates to the substrate in the thickness direction, another planar microwave line is sandwiched between the two ground conductors apart from the through slot, the two ground conductors are connected, and Another grounding conductor that electromagnetically shields a high-frequency signal passing through the through-slot and a high-frequency signal passing through the other planar microwave line is formed on the inner surface of the through-slot.

The slot-coupled microstrip antenna according to a second aspect is the slot-coupled microstrip antenna according to the first aspect, in which the ground conductor on the side of the radiation conductor, which is immediately below the radiation conductor, has another plane. Another slot for exciting the radiation conductor is formed so as to three-dimensionally intersect with the microwave line.

According to a third aspect of the present invention, there is provided a planar circuit device having a triplate structure in which a dielectric is sandwiched between two ground conductors and sandwiched between two planar microwave lines. A planar circuit device provided, wherein a through slot penetrating the planar circuit of the triplate structure in a thickness direction is formed so as to three-dimensionally intersect the two planar microwave lines, and the through slot. Apart from the above, another plane microwave line is sandwiched between the two ground conductors to connect the two ground conductors, and the high frequency signal passing through the through slot and the another plane microwave line are connected. Another grounding conductor that electromagnetically shields a high-frequency signal passing through the path is formed on the inner surface of the through slot.

[0015]

In the slot-coupled microstrip antenna according to claim 1 configured as described above, the high-frequency signal input to the planar microwave line formed on the first dielectric substrate is the planar signal. The microwave conductor excites the radiation conductor through the through slot, and the radio wave of the high frequency signal is radiated. Here, the another ground conductor electromagnetically shields the high frequency signal passing through the through slot and the high frequency signal passing through the other planar microwave line.

In the slot-coupled microstrip antenna according to a second aspect of the present invention, by inputting another high-frequency signal to the other planar microwave line, the high-frequency signal is transmitted from the other planar microwave line to the above-mentioned planar microwave line. The radiation conductor is excited through another slot, and the radio wave of the other high frequency signal is radiated.

Further, in the planar circuit device according to claim 3, the another ground conductor electromagnetically transmits a high frequency signal passing through the through slot and a high frequency signal passing through the other planar microwave line. Shield.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
FIG. 7 is a vertical cross-sectional view (taken along line AA ′ of FIGS. 2 to 6) of the slot-coupled microstrip antenna that is the embodiment of FIG. 2, and FIG. 2 is a plan view of the slot-coupled microstrip antenna of FIG. FIG. 3 shows the ground conductor plate 1 in the slot-coupled microstrip antenna of FIG.
1 is a plan view as seen from below, FIG. 4 is a plan view as seen from below the dielectric layer 21 in the slot-coupled microstrip antenna of FIG. 1, and FIG. 5 is shown in FIG. FIG. 7 is a plan view of the slot-coupled microstrip antenna when viewed from the lower side from the dielectric layer 22 on which the strip conductors 12 are formed, and FIG. 6 is a bottom-side rear surface of the slot-coupled microstrip antenna of FIG. It is the top view seen. 1 to 6, in FIG.
5 and those which are the same as those in FIG. 26 are designated by the same reference numerals.

In the slot-coupled microstrip antenna of the first embodiment, instead of the ground conductor plate 11 sandwiched between the two dielectric substrates 20 and 23 in the conventional example of FIGS. 25 and 26, Two ground conductor plates 11 and 14 facing each other are provided, and the two ground conductor plates 1 are provided.
1, 14 are filled with two dielectric layers 21 and 22, and another microstrip conductor 12 is sandwiched and formed between the dielectric layers 21 and 22. Further, a slot formed in the ground conductor plate 11 is formed. A slot is formed in the ground conductor plate 14 so as to face the dielectric layer 2 in the portion between the two slots.
1, 22 are removed to form a slot 30 penetrating between the two slots in the thickness direction, and the formed slot 30
The grounding conductor 13 for connecting the two grounding conductor plates 11 and 14 is formed on the entire inner surface of 1 to form the through slot 31 in which the conductor portion is grounded.

1 to 6, a dielectric substrate 2 having a microstrip conductor 15 for a power supply line formed on its back surface.
The ground conductor plate 14 is formed on the upper surface 3. After the dielectric layer 22 is formed on the ground conductor plate 14, the dielectric substrate 23 is formed.
A strip conductor 12 of another line is formed at a position away from the central portion of the. Next, after the dielectric layer 21 is formed on the dielectric layer 22 on which the strip conductor 12 is formed,
The ground conductor plate 11 is formed. Furthermore, the dielectric substrate 23
A slot 30 having a rectangular planar shape is formed in the center of the microstrip conductor 15 so as to penetrate in the thickness direction from the ground conductor plate 11 to the ground conductor plate 14 via the dielectric layers 21 and 22.
After being formed so as to be orthogonal to the longitudinal direction, the slot ground conductor 13 that connects the two ground conductor plates 11 and 14 is formed on the entire inner surface of the slot 30 to form the through slot 31. Then, after the dielectric substrate 20 is formed on the ground conductor plate 11, the rectangular radiation conductor 10 is formed at the center of the dielectric substrate 20.

Here, the through slot 31 is defined by the radiation conductor 10.
Located just below the center of the. Microstrip conductor 1
5 and the ground conductor plate 14 form a power supply microstrip line, while the strip conductor 12 and the two ground conductor plates 11 and 14 sandwiching the strip conductor 12 form another strip line having a triplate structure.

In the slot-coupled microstrip antenna configured as described above, since the radiation conductor 10 and the microstrip conductor 15 are electromagnetically connected to each other through the through slot 31, the above feeding microstrip antenna is provided. By inputting the microwave signal to be transmitted to the line, the radiation conductor 10 can be excited from the microstrip conductor 15 through the through slot 31. Further, since the feed line to the radiation conductor 10 and the strip line including the strip conductor 12 are electromagnetically shielded by the ground conductor plates 11 and 14 and the through slot 31, in the slot coupling type microstrip antenna, It is possible to provide a separate strip line that is completely shielded from the feed line to the radiation conductor 10.

<Second Embodiment> FIG. 7 shows a second embodiment of the present invention.
FIG. 8 is a vertical cross-sectional view (taken along line B1-B1 ′ of FIGS. 8 to 13) of the transmission / reception split-type circularly polarized planar array antenna of the (3 + 3) element of FIG. FIG. 14 is a vertical cross-sectional view (taken along line B2-B2 ′ of FIGS. 8 to 13), FIG. 9 is a plan view of the planar array antenna of FIGS. 7 and 8, and FIG. 10 is a plan view of FIGS. 7 and 8. FIG. 9 is a plan view of the array antenna when viewed from the lower side from the ground conductor plate 11, and FIG. 11 shows strip conductors 12a, 12b, 1 in the planar array antennas of FIGS. 7 and 8.
2C is a plan view of the lower side of the dielectric layer 22 on which 2c is formed, and FIG. 12 is a plan view of the planar array antenna of FIGS. FIG. 13 is a plan view of the planar array antenna of FIGS. 7 and 8 as viewed from the lower back surface to the upper surface. 7 to 13, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals.

The planar array antenna of the second embodiment has three transmitting antennas and three antennas as compared with the first embodiment.
Six cross-slot coupling type microstrip antennas each including one receiving antenna are provided. Here, the six rectangular radiation conductors 10 a to 1 are formed on the dielectric substrate 20.
0f is formed in a matrix shape so that transmission and reception are staggered, and the transmission radiation conductors 10a, 1 are formed on the dielectric layer 22.
0b and 10c are respectively excited through the cross-shaped slots 31a, 31b and 31c formed in the ground conductor plate 11 for feeding line strip conductors 12a and 12c.
b and 12c are formed, the receiving radiation conductors 10d, 10e, and 10f are formed on the back surface of the dielectric substrate 23 in the same cross-shaped through slots 31d and 31 as in the first embodiment.
Microstrip conductors 15d, 15e, and 15f for a power supply line for exciting via e and 31f are formed.

Since the transmission frequency and the reception frequency are different, the rectangular size of the transmission radiation conductors 10a to 10c is different from that of the reception radiation conductors 10d to 10f. In addition, as in the first embodiment, each strip conductor 1
While 2a to 12c and the ground conductor plates 11 and 14 respectively form a strip line for transmitting power, each microstrip conductor 12d to 12f and the ground conductor plate 14 are formed.
And form a microstrip line for receiving and feeding. In addition, as shown in FIG.
strip conductor 1 coupled via a, 31b, 31c
Each tip of 2a, 12b, 12c is made wider than its conductor width in order to increase the degree of coupling. Furthermore, FIG.
As shown in FIG. 3, the through slots 31d, 31e, 31f
Strip conductors 15d, 15e, 15 coupled via
Each tip of f is made wider than its conductor width in order to increase the degree of coupling.

In the planar array antenna configured as described above, the three transmitting radiation conductors 10a, 10b, 1
0c and the corresponding strip conductors 12a, 12b, 12
c is electromagnetically connected to each other through the slots 31a, 31b, 31c, and therefore, by inputting a microwave signal to be transmitted to the transmission power feeding strip antenna line, the strip conductors 12a, 12b, 12c are connected to the slots 31a. , 31b, 31c can excite the transmission radiation conductors 10a, 10b, 10c, respectively. On the other hand, the microwave signal received by the receiving radiation conductors 10 d, 10 e, 10 f is transmitted through the through slot 31.
Microstrip conductor 1 via d, 31e, 31f
It is input to three receiving and feeding microstrip lines including 5d, 15e, and 15f, respectively, and guided to the receiver.

Since the received microwave signal passes through the through slots 31d to 31f,
It is completely shielded from the microwave signal transmitted through each slot 31a to 31c. Therefore, the transmitted microwave signal does not sneak into the receiver, and it is possible to prevent cross modulation as in the conventional example.

In the second embodiment described above, the frequency-separated power supply or the transmission / reception-separated power supply can be performed in the form in which a plurality of power supply lines are completely separated into two groups.
This feeding method can be applied to an array antenna or a ray antenna using a subarray in which several elements are grouped and one active element is allocated to several radiating elements.

<Third Embodiment> FIG. 14 shows a slot-coupled microstrip antenna according to a third embodiment of the present invention (for the CC ′ line in FIGS. 15 to 19).
15 is a vertical sectional view, FIG. 15 is a plan view of the slot-coupled microstrip antenna of FIG. 14, and FIG.
4 is a plan view of the slot-coupled microstrip antenna of No. 4 when viewed from the ground conductor plate 11;
17 is a plan view of the slot-coupled microstrip antenna of FIG. 14 when viewed from below the dielectric layer 22 on which the strip conductor 12 is formed, and FIG. 18 is a plan view of the slot-coupled microstrip antenna of FIG. FIG. 20 is a plan view when the lower side is viewed from the ground conductor plate 14, and FIG. 19 is a plan view when the upper side is viewed from the lower back surface in the slot-coupled microstrip antenna of FIG. 14. Here, in FIG. 14 to FIG.
The same parts as those in FIG. 13 are designated by the same reference numerals.

The third embodiment is a polarization split feed microstrip antenna similar to the second conventional example.
As compared with the first embodiment, a slot formed in the ground conductor plate 11 so as to be orthogonal to the through slot 31g by the microwave signal fed to the strip line including the strip conductor 12 formed on the dielectric layer 22. It is characterized in that the radiation conductor 10 is excited via 31h.

As shown in FIG. 14, the through slot 31g
Is formed just like the through slot 31 of the first embodiment of FIG. 1 just under the radiation conductor 10 but away from the center portion, while the slot 31h is formed in the radiation conductor 10 as shown in FIG. It is formed so as to pass through the center and be three-dimensionally orthogonal to the through slot 31g. This makes it possible to construct a slot-coupling microstrip antenna for dual orthogonal polarization. Here, the first microwave signal input to the strip line including the strip conductor 12 and the second microwave signal input to the micro strip line including the microstrip conductor 15 have the same frequency and their By setting the phase difference to 90 °, circularly polarized radio waves can be transmitted as is known.
Alternatively, two linearly polarized waves orthogonal to each other may be used for transmission or reception, or one of them may be used for transmission and the other may be used for reception to be also used as a transmission / reception antenna.

In the third embodiment configured as described above, the first micro that excites the radiation conductor 10 after passing through the through-slot 31g after being input to the microstrip line including the microstrip conductor 15 is excited. The wave signal and the second microwave signal which is input to the strip line including the strip conductor 12 and excites the radiating conductor 10 through the slot 31h are supplied to the ground conductor plates 11 and 14 as in the first embodiment. With the through slot 30g, it can be electromagnetically shielded.

<Fourth Embodiment> FIG. 20 shows a slot-coupled microstrip antenna according to a fourth embodiment of the present invention (for the DD ′ line in FIGS. 21 to 24).
21 is a vertical sectional view, FIG. 21 is a plan view of the slot-coupled microstrip antenna of FIG. 20, and FIG.
FIG. 23 is a plan view of the slot coupling type microstrip antenna of No. 0 when viewed from the lower side from the dielectric layer 22 on which the strip conductor 12 is formed, and FIG. 23 is the grounding conductor plate 14 in the slot coupling type microstrip antenna of FIG. 20. FIG. 24 is a plan view of the slot-coupled microstrip antenna of FIG. 20 when viewed from the bottom to the top. 20 to 24, the same components as those in FIGS. 1 to 19 are designated by the same reference numerals.

In the fourth embodiment, as compared with the first embodiment, the MMIC section 40 having an RF / IF frequency conversion circuit is formed on the back surface of the dielectric substrate 23, and the dielectric layer 2 is formed.
Local oscillator signal transmission strip conductor 1 formed on 2
A rectangular slot 31i for electromagnetically coupling the strip conductor 12 and the microstrip conductor 15q is formed in the ground conductor plate 14 so as to be three-dimensionally orthogonal to 2 while being formed on the back surface of the dielectric substrate 23. The local oscillation signal transmission strip conductor 15q is formed so as to be connected to the MMIC section 40 so as to be three-dimensionally orthogonal to the slot 31i. Here, the tip end of the strip conductor 12 and the tip end of the microstrip conductor 15q orthogonal to the slot 31i are made wider than the line width in order to increase the coupling degree through the slot 31i.

In the fourth embodiment configured as described above, by inputting a local oscillation signal to the strip line including the strip conductor 14, the local oscillation signal is supplied from the strip conductor 14 via the slot 31i to the micro-channel. Input to strip conductor 15q, and further MMIC
It is input to the section 41. Thus, although the strip conductor 12 transmitting the local oscillation signal and the microstrip conductor 15p transmitting the RF signal intersect three-dimensionally, the ground conductor plates 11 and 14 and the through slot 31 are used. Since it is possible to electromagnetically shield the local oscillation signal and the RF signal, the isolation between the local oscillation signal and the RF signal can be increased.

The fourth embodiment can be applied to, for example, a so-called DBF antenna (Digital Beam Forming Antenna) having a digital IC for each antenna element, in which a slot 31i is not provided and a through hole is formed. By forming a through-hole conductor on the inner surface and electrically connecting the strip conductor 12 and the microstrip conductor 15q through the through-hole conductor, the strip line including the strip conductor 12 is connected to the digital I.
It may be used to supply a high-speed digital signal to C, or R
It may be used as a DC power supply line for supplying power to the F active element.

As described above, according to the above embodiments, the feed line for transmitting the RF signal for exciting the radiation conductor 10 through the through slot 31 and the ground conductor plates 11, 14 are provided.
Since it is possible to electromagnetically shield another feed line conductor that is sandwiched between the two line conductors, it is possible to physically bring the two line conductors close to each other in a state of having a predetermined isolation. Therefore, the devices of the above-described embodiments have the advantages that they can be made smaller and lighter than conventional devices, and that the degree of freedom in circuit design and wiring layout is increased.

Although the operation of the antenna during transmission is described in the above embodiments, the present invention is not limited to this, and the antenna can be used for reception.

Although the slot-coupled microstrip antenna and the planar array antenna using the same are described in the above embodiments, the present invention is not limited to this.
For example, in the structure of the first embodiment, the radiation conductor 10 is replaced with a microstrip conductor or a strip conductor, and the dielectric layers 21 and 22 are replaced with two ground conductor plates 11 and 14.
It is possible to apply the planar circuit of the triplate structure sandwiched between the two to the planar circuit device of the structure sandwiched between two planar microwave lines such as a microstrip line or a stripline. is there. Therefore, the 2
The two microwave lines can be electromagnetically connected via the through slot 31.

Although the rectangular radiation conductors 10 and 10a to 10f are used in the above embodiments, the present invention is not limited to this, and a radiation conductor having another shape such as a circular shape or an elliptical shape may be used. Good. The position of the slot is not limited to just below the central portion of the radiation conductor, but may be at the edge portion.

In the above embodiment, the two conductor plates 1
Although the dielectric layers 21 and 22 are sandwiched between 1 and 14, the present invention is not limited to this, and by supporting the strip conductor 12 with another dielectric member, these dielectric layers 21 and 22 can be formed.
22 may not be formed.

In the above embodiment, for example, the through slot 31 is three-dimensionally orthogonal to the microstrip conductor 15, but the present invention is not limited to this, and the degree of coupling is small, but at least they intersect. do it.

In the above embodiment, the slot 3 penetrating in the thickness direction from the ground conductor plate 11 to the ground conductor plate 14.
Although the ground conductor 13 is formed on the entire inner surface of 0, the present invention is not limited to this, and the slot 30 on the strip conductor 12 side is not limited to this.
The ground conductor 13 may be formed only on the inner surface. The formation position of the ground conductor 13 may be determined depending on the electromagnetic shielding characteristic.

[0045]

As described in detail above, according to the slot-coupled microstrip antenna according to the first aspect of the present invention, it is formed on the ground conductor sandwiched between the first and second dielectric substrates. Slot for exciting the radiating conductor formed on the second dielectric substrate by using the high frequency signal input to the planar microwave line formed on the first dielectric substrate through the slot formed in the second dielectric substrate. In the coupled microstrip antenna, two opposing grounding conductors are provided between the first and second dielectric substrates so that they are three-dimensionally intersecting with the planar microwave line immediately below the radiation conductor. Forming a through slot penetrating in a thickness direction from the first dielectric substrate to the second dielectric substrate through the two ground conductors, and separating the two ground conductors from the through slot. Another plane microwave line is interposed between the two ground conductors, and the two ground conductors are connected to each other and the high frequency signal passing through the through slot and the high frequency signal passing through the other plane microwave line are electromagnetically shielded. Since another ground conductor is formed on the inner surface of the through slot, the high frequency signal passing through the through slot and the high frequency signal passing through the other planar microwave line are electromagnetically shielded by the other ground conductor. be able to. Therefore, there is an advantage that the degree of freedom in the circuit design and the wiring layout is increased, and in the case of arraying, the entire antenna can be made smaller and lighter than the conventional one.

According to a third aspect of the planar circuit device of the present invention, a planar circuit having a triplate structure in which a dielectric is sandwiched between two ground conductors is provided between two planar microwave lines. A planar circuit device sandwiched between the two planar microwave lines,
Forming a through slot penetrating the planar circuit of the triplate structure in the thickness direction, away from the through slot,
Another plane microwave line is sandwiched between the two ground conductors to connect the two ground conductors, and the high frequency signal passing through the through slot and the other plane microwave line are passed. Since another ground conductor that electromagnetically shields high-frequency signals is formed on the inner surface of the through slot,
The another ground conductor can electromagnetically shield the high-frequency signal passing through the through-slot and the high-frequency signal passing through the other planar microwave line. Therefore, there is an advantage that the planar circuit device can be reduced in size and weight as compared with the conventional example, and the degree of freedom in circuit design and wiring layout is increased.

[Brief description of drawings]

FIG. 1 shows a slot-coupled microstrip antenna according to the first embodiment of the present invention (see FIGS. 2 to 6A).
FIG. 9 is a vertical cross-sectional view (taken along the line AA).

FIG. 2 is a plan view of the slot-coupled microstrip antenna of FIG.

3 is a plan view of the slot-coupled microstrip antenna of FIG. 1 when viewed from the bottom side of the ground conductor plate 11. FIG.

4 is a plan view of the slot-coupled microstrip antenna of FIG. 1 when viewed from below the dielectric layer 21. FIG.

5 is a plan view of the slot-coupled microstrip antenna of FIG. 1 when viewed from the lower side from the dielectric layer 22 on which the strip conductor 12 is formed.

FIG. 6 is a plan view of the slot-coupled microstrip antenna of FIG. 1 viewed from the lower back surface to the upper surface.

FIG. 7 is a second example according to the present invention (3 + 3)
FIG. 14 is a vertical cross-sectional view (taken along the line B1-B1 ′ of FIGS. 8 to 13) of a transmission / reception separated circular polarization planar array antenna.

8 is a plan view of the planar array antenna of FIG.
3 is a vertical cross-sectional view (taken along line B2-B2 ′ of FIG. 3).

9 is a plan view of the planar array antenna of FIGS. 7 and 8. FIG.

10 is a plan view of the planar array antenna of FIGS. 7 and 8 when viewed from below the ground conductor plate 11. FIG.

FIG. 11 is a plan view of the planar array antenna of FIGS. 7 and 8 when the lower side is viewed from the dielectric layer 22 on which the strip conductors 12a, 12b, and 12c are formed.

12 is a plan view of the planar array antenna of FIGS. 7 and 8 when viewed from the lower side from the ground conductor plate 14. FIG.

FIG. 13 is a plan view of the planar array antenna of FIGS. 7 and 8 as viewed from the lower back surface to the upper surface.

FIG. 14 shows a third embodiment of a slot-coupled microstrip antenna according to the present invention (see FIGS. 15 to 1).
FIG. 9 is a vertical cross-sectional view (taken along a line CC ′ of FIG. 9).

FIG. 15 is a plan view of the slot-coupled microstrip antenna of FIG.

16 is a plan view of the slot-coupled microstrip antenna of FIG. 14 when viewed from the bottom side of the ground conductor plate 11. FIG.

FIG. 17 is a plan view of the slot-coupled microstrip antenna of FIG. 14 when viewed from below the dielectric layer 22 on which the strip conductor 12 is formed.

FIG. 18 is a plan view of the slot-coupled microstrip antenna of FIG. 14 when viewed from the ground conductor plate 14;

FIG. 19 is a plan view of the slot-coupled microstrip antenna of FIG. 14 when viewed from the lower back surface to the upper surface.

FIG. 20 shows a fourth embodiment of the slot-coupling type microstrip antenna according to the present invention (see FIGS. 21 to 2).
4 is a vertical cross-sectional view (taken along line DD ′ of FIG. 4).

21 is a plan view of the slot-coupled microstrip antenna shown in FIG. 20. FIG.

22 is a plan view of the slot-coupled microstrip antenna of FIG. 20 as viewed from below the dielectric layer 22 on which the strip conductors 12 are formed.

23 is a plan view of the slot-coupled microstrip antenna of FIG. 20 when viewed from below the ground conductor plate 14. FIG.

FIG. 24 is a plan view of the slot-coupled microstrip antenna of FIG. 20 when viewed from the lower back surface to the upper surface.

FIG. 25 is a vertical cross-sectional view (taken along line EE ′ of FIG. 26) of a slot-coupled microstrip antenna of a conventional example.

FIG. 26 is a plan view of the slot-coupled microstrip antenna shown in FIG. 25.

[Explanation of symbols]

10, 10a to 10f ... Radiating conductor, 11, 14 ... Ground conductor plate, 12, 12a to 12c ... Strip conductor, 15, 15d to 15f, 15p, 15q ... Microstrip conductor, 13, 13d to 13f, 13g ... Slot grounding Conductor, 20, 23 ... Dielectric substrate, 21, 22 ... Dielectric layer, 30, 30d to 30g, 31a to 31c, 31h,
31i ... Slots, 31, 31d to 31g ... Through slots, 40 ... MMIC part.

Front page continuation (72) Wataru Nakajo Wataru Nakajo, Seika-cho, Kyoto Prefecture Oita Inuiya, No. 5 Mihiraya, ATR Optical & Radio Communications Research Institute, Inc. (72) Inventor Masayuki Fujise, Seiraku-cho, Kyoto Prefecture No. 5 Mihiratani, Inui-ya, Kochi Optical Radio Communications Laboratory, ATR Co., Ltd.

Claims (3)

[Claims] 1. An input to a planar microwave line formed on the first dielectric substrate through a slot formed in a ground conductor sandwiched between the first and second dielectric substrates. In a slot-coupled microstrip antenna for exciting a radiation conductor formed on the second dielectric substrate by using the generated high-frequency signal, two grounds facing each other between the first and second dielectric substrates are provided. A conductor is provided, and from the first dielectric substrate to the second dielectric substrate via the two ground conductors so as to three-dimensionally intersect the planar microwave line immediately below the radiation conductor. A through-slot that penetrates in the thickness direction, separates the through-slot from another through-plane microwave line between the two ground conductors, connects the two ground conductors, and connects the through-slot. Pass through Slot coupled microstrip antenna with separate grounding conductor, characterized in that formed on the inner surface of the through slot to shield the high-frequency signal passing through the high-frequency signal and said another plane microwave line electromagnetically. 2. The slot-coupled microstrip antenna according to claim 1, wherein the ground conductor on the side of the radiation conductor, which is directly below the radiation conductor, intersects the another planar microwave line in three dimensions. A slot-coupled microstrip antenna characterized in that another slot for exciting a radiation conductor is formed. 3. A planar circuit device in which a planar circuit having a triplate structure in which a dielectric is sandwiched between two ground conductors is sandwiched between two planar microwave lines, A through slot penetrating the planar circuit of the triplate structure in the thickness direction is formed so as to three-dimensionally intersect the planar microwave line, and is separated from the through slot to form a dielectric between the two ground conductors. Another plane microwave line is sandwiched to connect the two ground conductors and electromagnetically shield a high frequency signal passing through the through slot and a high frequency signal passing through the other plane microwave line. 2. The planar circuit device, wherein the ground conductor is formed on the inner surface of the through slot.