JP2006129232A - High-frequency circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-frequency circuit board capable of measuring characteristics of a high-frequency circuit without additionally attaching a component such as a test circuit or a connector, which, when additionally disposed on the board in a radio transmit/receive circuit with built-in antenna, would interfere with the miniaturization of radio equipment, raise manufacturing costs, and make it difficult to ensure good-quality transmission and measurement since the test circuit disposed on the board would serve as an antenna to receive radiation from another equipment. <P>SOLUTION: The high-frequency circuit board comprises at least two earthing terminal pads 11 that do not contact a microstrip line 19, and a longitudinal component of the microstrip line 19 corresponding to the length between the two earthing terminal pads 11 is disposed to have a length equal to the sum of an integer multiple of the half wavelength of a transmitted signal and a quarter of a wavelength. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-frequency circuit board provided with a transmission line capable of measuring characteristics of a high-frequency circuit on the same board.

  In recent years, for application to next-generation wireless communication technologies such as high-speed wireless LAN and satellite broadcasting, electromagnetic waves having a frequency of 3 GHz to 300 GHz and a wavelength of 1 mm to 10 cm, which are called microwaves and millimeter waves, which enable high-capacity data to be transmitted at high speed. Is attracting attention. Since the amount of information that can be transmitted is large and communication is possible with a small antenna, it is used for mobile communication and is beginning to be applied to ITS (Next Generation Transportation System) and automobile collision prevention radar.

For example, a wireless device mounted on an automobile is required to be miniaturized because space is limited, and the miniaturization is achieved by arranging an antenna portion of a wireless facility and a wireless transmission / reception circuit on the same substrate. When the antenna unit of the radio equipment and the radio transmission / reception circuit are arranged on the same substrate, it is difficult to separately measure the characteristics of the antenna and the characteristics of the radio transmission / reception circuit. A method has been developed in which an inspection connector is added between the antenna unit and the radio-frequency circuit and measurement is performed (for example, see Patent Document 1).
JP 2002-111379 A

  However, it is only before shipment that the high frequency characteristics are measured in the shipping inspection, and it is difficult to reduce the size of the wireless device and to make the manufacturing cost disadvantageous if a circuit for that purpose is separately formed on the board and components such as connectors are attached. In addition, an inspection circuit arranged on the substrate serves as an antenna, and receives radiation from other devices using the same frequency band, making it difficult to perform communication and inspection with good characteristics.

  An object of the present invention is to provide a high-frequency circuit board capable of measuring characteristics of a high-frequency circuit such as an antenna unit and a wireless transmission / reception unit without arranging parts such as an inspection circuit and a connector.

  To achieve the above object, a high-frequency circuit board according to the first invention of the present application includes at least two ground terminal pads that are not in contact with a microstrip line, and the microstrip line has a distance between two ground terminal pads. The longitudinal component is arranged so as to be a length obtained by adding a quarter length of a wavelength to an integral multiple of a half wavelength of a signal to be transmitted.

  Specifically, the first invention of the present application includes a microstrip line and at least two ground terminal pads that are not in contact with the microstrip line, and in the two ground pad terminals among the ground pad terminals. The longitudinal component of the microstrip line of the distance between the center points is a length obtained by adding a quarter of the wavelength to an integral multiple of a half wavelength of a signal transmitted through the microstrip line. A high-frequency circuit board.

  By short-circuiting one point on the microstrip line and one of the ground terminal pads, the wavelength is reduced to an integral multiple of a half wavelength of a signal transmitted on the microstrip line from the one point. When the one point is viewed from another point separated by a distance including the length of 1, the microstrip line on the one point side has a high impedance, and the one point side is in an open state. Therefore, only the characteristics of high-frequency circuits such as an antenna unit and a radio transceiver unit connected to the microstrip line on the opposite side of the one point with respect to the other point by bringing the inspection terminal into contact with the other point. Can be measured.

  Therefore, the high-frequency circuit board according to the first invention of the present application reduces the influence on the transmitted signal, and does not arrange components such as a circuit for inspection and a connector, and the high-frequency circuit such as the antenna unit and the radio transceiver unit. The characteristics can be measured, and the size of the radio equipment can be reduced.

  In order to achieve the above object, a high-frequency circuit board according to the second invention of the present application has a pair of ground terminal pad pairs arranged so as to sandwich a microstrip line on the board, and another pair of ground terminal pad pairs is also provided. The microstrip lines are arranged so as to sandwich the microstrip line, and the two pairs of ground terminal pads are arranged with an interval obtained by adding a length of a quarter of a wavelength to an integral multiple of a half wavelength of a transmitted signal. It was.

  Specifically, the second invention of the present application includes a microstrip line, a first ground terminal pad that is non-contact with the microstrip line, a non-contact with the microstrip line, and the microstrip line. A second ground terminal pad disposed on a side opposite to the first ground terminal pad side, contactless with the microstrip line and the first ground terminal pad, and the first ground with respect to the microstrip line. A third ground terminal pad disposed on the terminal pad side, and is not in contact with the microstrip line and the second ground terminal pad, and is disposed on the second ground terminal pad side with respect to the microstrip line. A fourth ground terminal pad, and a center point of the first ground terminal pad and a center point of the second ground terminal pad. An intersection of the first virtual line and the longitudinal center line of the microstrip line (hereinafter, the first virtual line connecting the center point of the first ground terminal pad and the center point of the second ground terminal pad; and The second imaginary line connecting the center point of the third ground terminal pad and the center point of the fourth ground terminal pad from the intersection point with the center line in the longitudinal direction of the microstrip line as “first intersection point”) And the intersection of the longitudinal center line of the microstrip line (hereinafter, the second virtual line connecting the center point of the third ground terminal pad and the center point of the fourth ground terminal pad and the length of the microstrip line) The distance to the intersection with the center line in the direction is defined as the “second intersection”.) The length of a quarter of the wavelength is added to an integral multiple of a half wavelength of the signal transmitted through the microstrip line. Characterized by length It is a high-frequency circuit board.

  By short-circuiting the first intersection on the microstrip line with the first ground terminal pad and the second ground terminal pad, the microstrip line on the first intersection side has a high impedance when viewed from the second intersection. Thus, the first intersection point side is open. Therefore, only the characteristics of high-frequency circuits such as an antenna unit and a radio transmission / reception unit connected to the microstrip line on the opposite side of the first intersection with respect to the second intersection by bringing the inspection terminal into contact with the second intersection Can be measured.

  Conversely, by short-circuiting the second intersection point on the microstrip line with the third ground terminal pad and the fourth ground terminal pad, the microstrip line on the second intersection point side as viewed from the first intersection point Becomes high impedance, and the second intersection side is opened. Therefore, only the characteristics of high-frequency circuits such as an antenna unit and a radio transmission / reception unit connected to the microstrip line on the opposite side of the second intersection with respect to the first intersection by bringing the inspection terminal into contact with the first intersection Can be measured.

  Therefore, the high-frequency circuit board according to the second invention of the present application reduces the influence on the transmitted signal, and does not arrange components such as a circuit for inspection and a connector, and the high-frequency circuit such as the antenna unit and the radio transceiver unit. The characteristics can be measured, and the size of the radio equipment can be reduced.

  In the high-frequency circuit according to the second invention of the present application, the shape of the first ground terminal pad, the shape of the second ground terminal pad, the shape of the third ground terminal pad or / and the shape of the fourth ground terminal pad are: The width in a direction parallel to the longitudinal direction of the microstrip line may be narrowed toward the microstrip line.

  If there is a ground terminal pad near the microstrip line, the ground terminal pad becomes a ground plane and locally becomes a coplanar line, resulting in impedance mismatch. Therefore, the electrical influence can be reduced by setting the shape of the ground terminal pad so that the width in the direction parallel to the longitudinal direction of the microstrip line becomes narrower toward the microstrip line.

  In the high-frequency circuit according to the second invention of the present application, on the edge facing the first ground terminal pad, the second ground terminal pad, the third ground terminal pad or / and the fourth ground terminal pad of the microstrip line. The microstrip line may have a notch that narrows the width.

  By having a notch that narrows the width of the microstrip line at the edge facing the grounding terminal pad, the grounding terminal pad that faces the microstrip line across the microstrip line is minimized while minimizing the influence on the impedance of the microstrip line. The microstrip line can be brought close to the microstrip line without contact. By making the grounding terminal pads close to each other, it is possible to use a GSG probe needle with a narrow interval between terminals, which is a set of grounding terminal, signal terminal, and grounding terminal, and the characteristics of the high-frequency circuit are highly accurate. Can be measured.

  In order to achieve the above object, the third invention of the present application reduces the width of the microstrip line in a section having a length that is an integral multiple of a half wavelength of a signal transmitted through the microstrip line, and Three sets of ground terminal pad pairs are arranged at intervals of an integral multiple of a half wavelength of a signal to be transmitted and a length of a quarter of a wavelength so as to sandwich the line.

  Specifically, the third invention of the present application relates to a narrow microstrip line whose length in the longitudinal direction is an integral multiple of a half wavelength of a signal to be transmitted, and both ends in the longitudinal direction of the narrow microstrip line. A wide microstrip line having a width wider than that of the narrow microstrip line, and being in non-contact with the narrow microstrip line and the wide microstrip line, and extending in a longitudinal direction of the narrow microstrip line. A first ground terminal pad centered on a first straight line intersecting a midpoint of one end (hereinafter, a midpoint of one end in the longitudinal direction of the narrow microstrip line is referred to as a “first intersection”); The first grounding terminal is not in contact with the narrow microstrip line and the wide microstrip line, and the first grounding end with respect to the longitudinal center line of the narrow microstrip line A second ground terminal pad located on the opposite side of the pad and centered on the first straight line; and non-contact with the first ground terminal pad, the narrow microstrip line, and the wide microstrip line A midpoint of the other end in the longitudinal direction of the narrow microstrip line (hereinafter referred to as the center of the other end in the longitudinal direction of the narrow microstrip line). A second grounding point pad that is centered on a second straight line intersecting with the second grounding terminal pad, the second grounding terminal pad, the narrow microstrip line, and the wide microstrip line. A fourth ground terminal pad disposed on the second ground terminal pad side with respect to the center line and having a center on the second straight line; the first ground terminal pad; Non-contact with the third ground terminal pad, the narrow microstrip line, and the wide microstrip line, disposed on the first ground terminal pad side with respect to the center line, and in the longitudinal direction of the narrow microstrip line The position of a distance obtained by adding a quarter length to an integral multiple of a half wavelength on the center line from one end (hereinafter referred to as an integral multiple of a half wavelength on the center line from one longitudinal end of the narrow microstrip line) The position of the distance including the length of the quarter is referred to as a “third intersection”.) A fifth ground terminal pad centered on a third straight line intersecting with the second ground terminal pad, Four ground terminal pads, non-contact with the narrow microstrip line and the wide microstrip line, disposed on the second ground terminal pad side with respect to the center line, and the third And a sixth ground terminal pad centered on a straight line.

  By short-circuiting the third intersection point on the microstrip line with the fifth ground terminal pad and the sixth ground terminal pad, the microstrip line on the first intersection side has a high impedance when viewed from the second intersection point. Thus, the first intersection point side is open. Therefore, only the characteristics of high-frequency circuits such as an antenna unit and a radio transmission / reception unit connected to the microstrip line on the opposite side of the first intersection with respect to the second intersection by bringing the inspection terminal into contact with the second intersection Can be measured.

  Conversely, by short-circuiting the third intersection point on the microstrip line with the fifth grounding terminal pad and the sixth grounding terminal pad, the microstrip line on the second intersection point side when viewed from the first intersection point. Becomes high impedance, and the second intersection side is opened. Therefore, only the characteristics of high-frequency circuits such as an antenna unit and a radio transmission / reception unit connected to the microstrip line on the opposite side of the second intersection with respect to the first intersection by bringing the inspection terminal into contact with the first intersection Can be measured.

  Further, by using the narrow microstrip line, it is possible to bring the grounding terminal pad opposed across the narrow microstrip line close to the narrow microstrip line without contact. By bringing the ground terminal pads close to each other, it is possible to use a GSG probe needle having a narrow interval between terminals, and to measure the characteristics of the high-frequency circuit with high accuracy.

  The impedance of the narrow microstrip line is higher than the impedance of the wide microstrip line, and impedance mismatch occurs at the connection point between the narrow microstrip line and the wide microstrip line. However, by making the length in the longitudinal direction of the narrow microstrip line an integral multiple of the half wavelength of the transmitted signal, impedance mismatch at the connection points at both ends of the narrow microstrip line Since the reflected waves cancel each other, the influence of impedance mismatch on the signal transmitted at the connection point can be reduced.

  Therefore, the high-frequency circuit board according to the third invention of the present application reduces the influence on the transmitted signal, and does not arrange components such as a circuit for inspection and a connector, and the high-frequency circuit such as the antenna unit and the radio transceiver unit. The characteristics can be measured with high accuracy, and the radio equipment can be miniaturized.

  In the high-frequency circuit according to the third invention of the present application, the shape of the first ground terminal pad, the shape of the second ground terminal pad, the shape of the third ground terminal pad, the shape of the fourth ground terminal pad, the fifth The shape of the ground terminal pad and / or the shape of the sixth ground terminal pad may be a shape whose width in a direction parallel to the longitudinal direction of the microstrip line becomes narrower toward the microstrip line.

  If there is a ground terminal pad near the microstrip line, the ground terminal pad becomes a ground plane and locally becomes a coplanar line, resulting in impedance mismatch. Therefore, by reducing the width of the ground terminal pad in the direction parallel to the longitudinal direction of the microstrip line so that it narrows toward the microstrip line, the electrical influence on the transmitted signal is reduced. Can do.

  In the high-frequency circuit board according to the third invention of the present application, the wide microstrip line is reduced from the width of the wide microstrip line to the width of the narrow microstrip line toward the connection point with the narrow microstrip line. It may have a transition section.

  By having the transition section, it is possible to avoid an abrupt change in impedance at the connection point between the narrow microstrip line and the wide microstrip line. The influence of matching can be reduced.

  In order to achieve the above object, the fourth invention of the present application is a coplanar line whose length in the longitudinal direction is an integral multiple of a half wavelength of a signal to be transmitted plus a length of a quarter of the wavelength. A microstrip line is connected to each end of the wire.

  Specifically, in the fourth invention of the present application, the length of the signal line in the longitudinal direction is a signal line having a length that is an integral multiple of a half wavelength of the transmitted signal plus a quarter of the wavelength. And a microstrip line connected to both ends in the longitudinal direction of the signal line of the coplanar line.

  When viewed from the other end in the longitudinal direction of the signal line of the coplanar line by short-circuiting one end in the longitudinal direction of the signal line of the coplanar line and the ground plane of the coplanar line, the longitudinal direction of the signal line of the coplanar line One end of the signal line has a high impedance, and one end in the longitudinal direction of the signal line of the coplanar line is in an open state. Therefore, an antenna unit connected to the microstrip line connected to the other end in the longitudinal direction of the signal line of the coplanar line by contacting the inspection terminal with the other end in the longitudinal direction of the signal line of the coplanar line, wireless Only the characteristics of a high-frequency circuit such as a transceiver can be measured.

  Moreover, the impedance of the coplanar line can be adjusted by adjusting the distance between the signal line and the ground plane. Therefore, the impedance of the coplanar line can be matched with the impedance of the microstrip line, and the influence of impedance mismatch on the transmitted signal is reduced at the connection point between the microstrip line and the coplanar line. be able to.

  Therefore, the high-frequency circuit board according to the fourth invention of the present application reduces the influence on the transmitted signal and does not arrange components such as a circuit for inspection and a connector, and the high-frequency circuit such as the antenna unit and the radio transceiver unit. The characteristics can be measured, and the size of the radio equipment can be reduced.

  In the high-frequency circuit according to the fourth invention of the present application, the width of the signal line of the coplanar line may be narrower than the width of the microstrip line.

  By reducing the width of the signal line of the coplanar line, the ground plane can be brought close to the signal line of the coplanar line without contact. By making the ground plane close to each other, a GSG probe needle having a narrow interval between terminals can be used, and the characteristics of the high-frequency circuit can be measured with high accuracy.

  In the high-frequency circuit according to the fourth invention of the present application, the microstrip line decreases from the width of the microstrip line to the width of the signal line of the coplanar line toward the connection point with the signal line of the coplanar line. You may have.

  By having the transition section, it is possible to avoid an abrupt change in impedance at the connection point between the microstrip line and the coplanar line, and to reduce the influence of impedance mismatch on the transmitted signal at the connection point. can do.

  In order to achieve the above object, the fifth invention of the present application is the width of a signal line in a length section obtained by adding a quarter length of a wavelength to an integral multiple of a half wavelength of a signal transmitted through a coplanar line. Was decided to be narrowed.

  Specifically, in the fifth invention of the present application, the length of the signal line in the longitudinal direction is a signal line having a length that is an integral multiple of a half wavelength of the transmitted signal plus a quarter of the wavelength. A narrow coplanar line, and a wide coplanar line connected to both longitudinal ends of the signal line of the narrow coplanar line and having a signal line wider than the signal line of the narrow coplanar line, A high-frequency circuit board provided.

  By short-circuiting one end in the longitudinal direction of the signal line of the narrow coplanar line and the ground plane of the narrow coplanar line, when viewed from the other end in the longitudinal direction of the signal line of the narrow coplanar line, the narrow line One end in the longitudinal direction of the signal line of the coplanar line has a high impedance, and one end in the longitudinal direction of the signal line of the narrow coplanar line is in an open state. Therefore, the inspection terminal is brought into contact with the other end in the longitudinal direction of the signal line of the narrow coplanar line, thereby connecting the signal line of the wide coplanar line to the other end in the longitudinal direction of the signal line of the narrow coplanar line. Only the characteristics of the high-frequency circuit such as the connected antenna unit and wireless transceiver unit can be measured.

  Moreover, the impedance of the coplanar line can be adjusted by adjusting the distance between the signal line and the ground plane. Therefore, the impedance of the narrow coplanar line can be matched with the impedance of the wide coplanar line, and the influence of impedance mismatch on the transmitted signal at the contact point between the wide coplanar line and the narrow coplanar line. Can be reduced.

  Further, by reducing the width of the signal line of the narrow coplanar line, the ground plane can be brought close to the signal line of the narrow coplanar line without contact. By making the ground plane close to each other, a GSG probe needle having a narrow interval between terminals can be used, and the characteristics of the high-frequency circuit can be measured with high accuracy.

  Therefore, the high-frequency circuit board according to the fifth invention of the present application can accurately measure the characteristics of the high-frequency circuit such as the antenna unit and the wireless transmission / reception unit without arranging parts such as an inspection circuit and a connector. The equipment can be downsized.

  In the high-frequency circuit according to the fifth invention of the present application, the signal line of the wide coplanar line is connected to the signal line of the narrow coplanar line from the width of the wide coplanar line to the signal line of the narrow coplanar line. It may have a transition section that reduces to the width of.

  By having the transition section, it is possible to avoid an abrupt change in impedance at the connection point between the wide coplanar line and the narrow coplanar line, and to reduce the generation of reflected waves due to impedance mismatch, The influence of impedance mismatch on the signal transmitted at the connection point can be reduced.

  According to the present invention, it is possible to measure the characteristics of a high-frequency circuit such as an antenna unit and a wireless transmission / reception unit without arranging components such as an inspection circuit and a connector on a high-frequency circuit board. In addition, the size of the wireless device can be reduced.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing an outline of a high-frequency circuit board 101 according to an embodiment of the second invention of the present application. The high-frequency circuit board 101 is an antenna-integrated radio transceiver in which, for example, a radio transmission / reception circuit 92 that transmits and receives a high-frequency signal of 24 GHz and a planar patch antenna circuit 91 are arranged on the same board. FIG. FIG. The high-frequency circuit board 101 includes a board 10, a microstrip line 19, ground terminal pads 11 to 14, an antenna circuit 91, and a wireless transmission / reception circuit 92.

  The substrate 10 is a planar substrate on which high-frequency circuits such as an antenna circuit, a transmission circuit, and an amplifier circuit are arranged on the surface or an intermediate layer. The back surface or the intermediate layer has a conductor such as a grounding copper foil. As the material of the substrate 10, a material having improved insulation with the circuit on the surface, for example, a dielectric material such as glass epoxy resin, fluororesin, or ceramic can be used.

  The microstrip line 19 is a transmission line that couples the output power of the radio transmission / reception circuit 92 to the antenna circuit 91 and couples the radio power received by the antenna circuit 91 to the radio transmission / reception circuit 92. As the material of the microstrip line 19, a conductor such as copper, lead, silver, or an alloy thereof can be used. In order to match the output impedance and the input impedance of the antenna circuit 91 and the wireless transmission / reception circuit 92, the width of the microstrip line 19 is adjusted to a predetermined impedance.

  The ground terminal pads 11, 12, 13, and 14 are ground terminals that are connected to the back surface of the substrate 10 or a grounding conductor on an intermediate layer through a through hole opened in the substrate 10. Copper, lead, silver, and alloys thereof can be used as the conductor material.

  In the high-frequency circuit board 101, the microstrip line 19 and the ground terminal pads 11 to 14 are arranged in the following positional relationship. The microstrip line 19 and the ground terminal pad 11 are arranged so as not to contact each other. The ground terminal pad 12 is disposed so as not to contact the microstrip line 19 and to be opposite to the ground terminal pad 11 with respect to the microstrip line 19. The ground terminal pad 13 is disposed so as not to contact the microstrip line 19 and the ground terminal pad 11 and to be on the ground terminal pad 11 side with respect to the microstrip line 19. The ground terminal pad 14 is disposed so as not to contact the microstrip line 19 and the ground terminal pad 12 and to be on the ground terminal pad 12 side with respect to the microstrip line 19.

  Furthermore, the intersection of the first virtual line connecting the center point of the ground terminal pad 11 and the center point of the ground terminal pad 12 and the center line in the longitudinal direction of the microstrip line 19 (hereinafter referred to as the center point of the ground terminal pad 11 and the ground) The intersection point of the microstrip line 19 that crosses the center point of the terminal pad 12 and the center line of the longitudinal direction of the microstrip line 19 is referred to as “intersection point 191”), and the center point of the ground terminal pad 13 and the center point of the ground terminal pad 14 Of the microstrip line 19 crossing between the center point of the ground terminal pad 13 and the center point of the ground terminal pad 14 (hereinafter, the center point of the ground terminal pad 13 and the center point of the ground terminal pad 14). The distance to the intersection with the center line in the direction is “intersection 192”.) The distance to the integral multiple of the half wavelength of the signal transmitted through the microstrip line 19 is a quarter of the wavelength. The placing grounding terminal pads 11 to 14 so that the length obtained by adding.

  The high frequency circuit board 101 operates as follows. At the time of transmission, the radio transmission / reception circuit 92 couples a high frequency signal of 24 GHz to the microstrip line 19. The high-frequency signal propagates through the microstrip line 19 to reach the antenna circuit 91 and is radiated from the antenna circuit 91 as a radio signal. At the time of reception, the antenna circuit 91 converts the received radio signal into a high frequency signal and couples it to the microstrip line 19. The high-frequency signal propagates through the microstrip line 19 and reaches the wireless transmission / reception circuit 92 and is signal-processed.

  On the other hand, when measuring the characteristics of the wireless transmission / reception circuit 92, the intersection point 191, the ground terminal pad 11, and the ground terminal pad 12 are short-circuited. Next, an inspection terminal is brought into contact with the intersection 192 for measurement.

  An example in the case of measuring the radio transmission / reception circuit 92 on the high-frequency circuit board 101 is shown in FIG. 2, the same reference numerals as those used in FIG. 1 perform the same functions and the same operations. The microstrip line 19, the ground terminal pad 11, and the ground terminal pad 12 on the antenna circuit 91 side from the intersection 191 are covered with the electrode plate 22 and short-circuited. The signal needle 25b of the GSG probe 25 for the coplanar line is brought into contact with the intersection 192, which is a measurement point, and the ground terminal needles 25c and 25a are brought into contact with the ground terminal pad 13 and the ground terminal pad 14, respectively. A GSG probe is a probe for directly contacting a measurement target of a microwave transmission component such as a high-frequency printed circuit board, a high-speed CPU, or a socket, and measuring impedance and circuit characteristics. In the structure, three conductive needles such as aluminum and tungsten are arranged at regular intervals, the central needle is a signal wire, and the needles at both ends are grounding needles.

  By covering the intersection 191, the ground terminal pad 11 and the ground terminal pad 12 with the electrode plate 22 and short-circuiting them, the microstrip line 19 on the antenna circuit 91 side from the intersection 192 which is a measurement point is in a short stub state. Since the distance between the intersection point 191 and the intersection point 192 is an integral multiple of a half wavelength of the transmitted signal plus a quarter of the wavelength, the wavelength is multiplied by an integral multiple of the half wavelength of the transmitted signal. A short stub with a length equal to one-fourth of the length is added. At the intersection 192, the waves of the high-frequency signal reflected at the intersection 191 strengthen each other, and the impedance on the intersection 191 side of the microstrip line 19 becomes very high. Apparently, only the wireless transmission / reception circuit 92 is connected to the microstrip line 19. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the wireless transmission / reception circuit 92.

  Conversely, the microstrip line 19, the ground terminal pad 13, and the ground terminal pad 14 on the wireless transmission / reception circuit 92 side from the intersection 192 are covered and short-circuited by the electrode plate 22, and the GSG probe 25 for the coplanar line is measured using the intersection 191 as a measurement point. The signal strip 25b at the crossing point 191 and the grounding terminal needles 25a and 25c are brought into contact with the grounding terminal pad 11 and the grounding terminal pad 12, so that the microstrip line 19 on the wireless transmission / reception circuit 92 side from the crossing point 191 is in a short stub state. It becomes. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the antenna circuit 91.

  1 and FIG. 2, between the center point of the ground terminal pad 11 and the center point of the ground terminal pad 12, and between the center point of the ground terminal pad 13 and the center point of the ground terminal pad 14. Although the microstrip line 19 vertically crosses between the ground terminal pads 11 to 14, the ground terminal pads 11 to 14 may be arranged at arbitrary angles. Even when the distance between the signal needle 25b of the GSG probe 25 and the ground terminal needles 25a and 25c is wider than the distance between the microstrip line 19 and the ground terminal pads 11 to 14, the high frequency circuit can be measured. Similarly, the ground terminal pads can be arranged at an arbitrary angle in the high-frequency circuit boards of FIGS. 3 to 6 described below.

  In the high-frequency circuit board 101a of FIG. 3, the shape of the ground terminal pad 11a, the shape of the ground terminal pad 12a, the shape of the ground terminal pad 13a, and the shape of the ground terminal pad 14a are parallel to the longitudinal direction of the microstrip line 19. The width of the line is narrowed toward the microstrip line 19. In FIG. 3, the same reference numerals as those used in FIGS. 1 and 2 perform the same functions and the same operations.

  If there is a ground terminal pad in the vicinity of the microstrip line, the ground terminal pad becomes a ground plane and locally becomes a coplanar line, resulting in impedance mismatch. Therefore, the signal transmitted by setting the shape of the ground terminal pad so that the width in the direction parallel to the longitudinal direction of the microstrip line 19 becomes narrower toward the microstrip line 19 like the ground terminal pads 11a to 14a. The electrical influence on can be reduced.

  The high-frequency circuit board 101b of FIG. 4 does not include the microstrip line 19 of the high-frequency circuit board 101a, and has a notch 17 on the edge facing the ground terminal pad 11a, the ground terminal pad 12a, the ground terminal pad 13a, and the ground terminal pad 14a. In addition, the microstrip line 19b having a locally narrow width is provided. 4, the same reference numerals as those used in FIGS. 1, 2, and 3 perform the same functions and the same operations.

  In order to accurately measure the characteristics of high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92, the interval between the signal needle 25b and the ground terminal needles 25a and 25c of the GSG probe 25 is set to be equal to or less than the wavelength of the signal to be transmitted. Is required.

  By having the notch 17 in which the width of the microstrip line becomes narrow at the edge facing the ground terminal pads 11a to 14a, the influence on the impedance of the microstrip line 19b is minimized, and the ground terminal pads 11a to 14a are connected to the microstrip line. It can be arranged close to the microstrip line 19b without contact with 19b. Therefore, in the high frequency circuit board 101b, the GSG probe 25 having a narrow interval between the signal needle 25b and the ground terminal needles 25a and 25c can be used, and the characteristics of the high frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92 are improved. It can be measured with high accuracy.

  According to the second invention of this application, the influence on the signal transmitted between the antenna circuit 91 and the wireless transmission / reception unit 92 is reduced, and the characteristics of the high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception unit 92 are measured. Can do. Therefore, it is possible to provide a high-frequency circuit board that does not require the placement of components such as a circuit for inspection and a connector. In addition, the size of the wireless device can be reduced.

(Embodiment 2)
FIG. 5 is a diagram showing an outline of the high-frequency circuit board 102 according to an embodiment of the third invention of the present application. The high-frequency circuit board 102 is, for example, an antenna-integrated radio transceiver in which a radio transmission / reception circuit 92 that transmits and receives a high-frequency signal of 24 GHz and a planar patch antenna circuit 91 are arranged on the same substrate. FIG. FIG. The high frequency circuit board 102 includes a substrate 10, a microstrip line 29 a, a microstrip line 29 b, a microstrip line 29 c, ground terminal pads 11 a to 16 a, an antenna circuit 91, and a radio transmission / reception circuit 92. 5, the same reference numerals as those used in FIGS. 1 and 4 have the same functions and the same operations.

  The high-frequency circuit board 101b in FIG. 4 differs from the high-frequency circuit board 102 in FIG. 5 in that the microstrip line 19b is not provided and the microstrip line 29a, the microstrip line 29b, the microstrip line 29a, and the width of the microstrip line 29b. The microstrip line 29c having a narrower width is provided, and the ground terminal pads 15a and 16a are provided.

  The microstrip line 29a, the microstrip line 29b, and the microstrip line 29c are transmission lines made of a conductor such as copper, lead, silver, or an alloy thereof. A microstrip line 29a and a microstrip line 29b are connected to both ends of the microstrip line 29c in the longitudinal direction, respectively. An antenna circuit 91 is connected to the end of the microstrip line 29a where the microstrip line 29c in the longitudinal direction is not connected. A wireless transmission / reception circuit 92 is connected to the end of the microstrip line 29b where the microstrip line 29c in the longitudinal direction is not connected.

  In order to match the output impedance and the input impedance of the antenna circuit 91 and the wireless transmission / reception circuit 92, the widths of the microstrip lines 29a and 29b are adjusted to have a predetermined impedance.

  The length of the microstrip line 29c in the longitudinal direction is an integral multiple of the half wavelength of the signal to be transmitted, and the microstrip line 29c is narrower than the microstrip lines 29a and 29b. .

  The ground terminal pads 15 a and 16 a are ground terminals that are connected to the ground conductors on the back surface or the intermediate layer of the substrate 10 through through holes opened in the substrate 10. Conductors such as copper, lead, silver, and alloys thereof can be used as the material for the ground terminal pads 15a and 16a.

  In the high-frequency circuit board 102, the microstrip lines 29a to 29c and the ground terminal pads 11a to 16a are arranged so as to have the following positional relationship. The ground terminal pad 11a is not in contact with the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, and is centered on a first straight line that intersects the midpoint of one end in the longitudinal direction of the microstrip line 29c. Be placed. The ground terminal pad 12a is not in contact with the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, and is opposite to the ground terminal pad 11a side with respect to the longitudinal center line of the microstrip line 29c. It arrange | positions so that a center may exist on a 1st straight line. The ground terminal pad 13a is not in contact with the ground terminal pad 11a, the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, is on the side of the ground terminal pad 11a with respect to the center line, and is the length of the microstrip line 29c. It arrange | positions so that a center may be on the 2nd straight line which cross | intersects the midpoint of the other end of a direction. The ground terminal pad 14a is not in contact with the ground terminal pad 12a, the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, is on the side of the ground terminal pad 12a with respect to the center line, and is on the second straight line. Arranged to have a center. The ground terminal pad 15a is not in contact with the ground terminal pad 11a, the ground terminal pad 13a, the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, is on the side of the ground terminal pad 11a with respect to the center line, and is microscopic. The strip line 29c is arranged so that the center is on a third straight line that intersects the position of a distance obtained by adding a length of a quarter to an integral multiple of a half wavelength on the center line from one end in the longitudinal direction of the strip line 29c. The ground terminal pad 16a is not in contact with the ground terminal pad 12a, the ground terminal pad 14a, the microstrip line 29c, the microstrip line 29a, and the microstrip line 29b, is on the side of the ground terminal pad 12a with respect to the center line, and It arrange | positions so that a center may exist on a 3rd straight line.

  The ground terminal pad in the vicinity of the microstrip line serves as a ground plane and locally serves as a coplanar line to prevent impedance mismatch and does not affect the signal transmitted to the microstrip line 29c. The pads 11a to 16a have a shape in which the width in the direction parallel to the longitudinal direction of the microstrip line 29c becomes narrower toward the microstrip line 29c, but other shapes can also be used.

  The high frequency circuit board 102 operates as follows. At the time of transmission, the radio transmission / reception circuit 92 couples a high frequency signal of 24 GHz to the microstrip line 29b. The microstrip line 29b couples the high frequency signal to the microstrip line 29c, then the microstrip line 29c couples the high frequency signal to the microstrip line 29a, and the microstrip line 29a couples the high frequency signal to the antenna circuit 91. To do. The antenna circuit 91 radiates the high frequency signal as a radio signal. Conversely, at the time of reception, the antenna circuit 91 converts the received radio signal into a high frequency signal and couples it to the microstrip line 29a. The microstrip line 29a couples the coupled high frequency signal to the microstrip line 29c, then the microstrip line 29c couples the high frequency signal to the microstrip line 29b, and the microstrip line 29b wirelessly transmits and receives the high frequency signal. Coupled to circuit 92. The radio transmission / reception circuit 92 processes the combined high-frequency signal.

  Further, by making the width of the microstrip line 29c narrower than the width of the microstrip lines 29a and 29b, the impedance of the microstrip line 29c becomes higher than the impedance of the microstrip lines 29a and 29b. Accordingly, a connection point between the microstrip line 29c and the microstrip line 29a (hereinafter, a connection point between the microstrip line 29c and the microstrip line 29a is referred to as a “connection point 291”) and the microstrip line 29c and the microstrip line 29b. A reflected wave due to impedance mismatching occurs at a connection point (hereinafter, a connection point between the microstrip line 29c and the microstrip line 29b is referred to as a “connection point 292”). However, since the length of the microstrip line 29c in the longitudinal direction is an integral multiple of the half wavelength of the signal to be transmitted, the reflected waves generated at the connection point 291 and the connection point 292 cancel each other. At point 292, the effect of impedance mismatch on the transmitted signal can be reduced.

  On the other hand, when measuring the characteristics of the wireless transmission / reception circuit 92, the position of a distance (hereinafter, referred to as a length obtained by adding a quarter length to an integral multiple of a half wavelength on the center line from one end in the longitudinal direction of the microstrip line 29c. The position of a distance obtained by adding a quarter length to an integral multiple of a half wavelength on the center line from one end in the longitudinal direction of the microstrip line 29c is referred to as an “intersection 293”), the ground terminal pad 15a, and the ground terminal The pad 16a is short-circuited. Next, an inspection terminal is brought into contact with the connection point 292 and measurement is performed.

  An example in the case of measuring the radio transmission / reception circuit 92 on the high-frequency circuit board 102 is shown in FIG. In FIG. 6, the same reference numerals as those used in FIGS. 1, 2, and 5 have the same functions and the same operations. The microstrip line 29c, the ground terminal pad 15a, and the ground terminal pad 16a on the antenna circuit 91 side from the intersection 293 are covered with the electrode plate 22 and short-circuited. The signal needle 25b of the GSG probe 25 for the coplanar line is brought into contact with the connection point 292 which is a measurement point, and the ground terminal needles 25c and 25a are brought into contact with the ground terminal pad 13a and the ground terminal pad 14a.

  By covering the intersection point 293, the ground terminal pad 15a, and the ground terminal pad 16a with the electrode plate 22 and short-circuiting them, the microstrip line 29c on the antenna circuit 91 side from the connection point 292 that is the measurement point becomes a short stub state. The distance between the intersection 293 and the connection point 292 is an integral multiple of a half wavelength of the transmitted signal plus a length of a quarter of the wavelength, and thus is an integral multiple of the half wavelength of the transmitted signal. It becomes a short stub with a length that is a quarter of the wavelength, and the wave of the high-frequency signal reflected at the intersection 293 is strengthened at the connection point 292, and the impedance on the connection point 291 side of the microstrip line 29c is very high. Apparently, only the wireless transmission / reception circuit 92 is connected to the microstrip line 29c. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the wireless transmission / reception circuit 92.

  On the other hand, the microstrip line 29c, the ground terminal pad 15a, and the ground terminal pad 16a on the wireless transmission / reception circuit 92 side from the intersection 293 are covered with the electrode plate 22 and short-circuited, and the GSG probe for the coplanar line is measured using the connection point 291 as the measurement point. By connecting the 25 signal needles 25b to the connection point 291 and the grounding terminal needles 25a and 25c to the grounding terminal pad 11a and the grounding terminal pad 12a, the microstrip line 29c on the wireless transmission / reception circuit 92 side from the connection point 291 becomes Short stub state. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the antenna circuit 91.

  Further, by reducing the width of the microstrip line 29c, the ground terminal pads 11a to 16a can be arranged close to the microstrip line 29c without contacting the microstrip line 29c, so that the signal needle 25b, the ground The GSG probe 25 having a narrow interval between the terminal needles 25a and 25c can be used, and the characteristics of high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92 can be measured with high accuracy.

  In the high-frequency circuit board 102, the microstrip lines 29a and 29b have a transition section A that decreases from the width of the microstrip lines 29a and 29b to the width of the microstrip line 29c toward the connection point with the microstrip line 29c. Also good.

  By having the transition section A, an abrupt change in impedance can be avoided at the connection point between the microstrip line 29c and the microstrip lines 29a and 29b, and the generation of reflected waves due to impedance mismatching can be reduced. Therefore, at the connection point between the microstrip line 29c and the microstrip lines 29a and 29b, the influence of impedance mismatch on the transmitted signal can be reduced.

  According to the third invention of the present application, it is possible to reduce the influence on the signal transmitted between the antenna circuit 91 and the wireless transmission / reception circuit 92, and to measure the characteristics of the high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92. Can do. Therefore, it is possible to provide a high-frequency circuit board that does not require the placement of components such as a circuit for inspection and a connector. In addition, the size of the wireless device can be reduced.

(Embodiment 3)
FIG. 7 is a diagram showing an outline of the high-frequency circuit board 103 according to the fourth embodiment of the present invention. The high frequency circuit board 103 is, for example, an antenna integrated radio transceiver in which a radio transmission / reception circuit 92 that transmits and receives a high frequency signal of 24 GHz and a planar patch antenna circuit 91 are arranged on the same substrate. FIG. FIG. The high-frequency circuit board 103 includes a board 10, a microstrip line 39 a, a microstrip line 39 b, a coplanar line 38, an antenna circuit 91, and a wireless transmission / reception circuit 92. 7, the same reference numerals as those used in FIGS. 1 and 5 have the same functions and the same operations.

  The microstrip lines 39a and 39b are transmission lines made of conductors such as copper, lead, silver, and alloys thereof. The microstrip line 39 a has one end in the longitudinal direction connected to the signal line 38 a of the coplanar line 38 and the other end connected to the antenna circuit 91. The microstrip line 39 b has one end in the longitudinal direction connected to the signal line 38 a of the coplanar line 38 and the other end connected to the radio transmission / reception circuit 92. In order to match the impedance of the antenna circuit 91 and the wireless transmission / reception circuit 92, the widths of the microstrip lines 39a and 39b are adjusted to have a predetermined impedance.

  The coplanar line 38 includes a signal line 38a and a grounded planar 38b. The signal line 38a is a transmission line made of a conductor such as copper, lead, silver, or an alloy thereof. The signal line 38a is connected to microstrip lines 39a and 39b at both ends in the longitudinal direction. The ground planar 38b is a ground planar that is connected to the back surface of the substrate 10 or a grounding conductor on an intermediate layer through a through hole opened in the substrate 10. Conductors such as copper, lead, silver, and alloys thereof can be used as the material of the ground planar 38b. The ground planar 38b is arranged so as to sandwich the signal line 38a and not to contact both sides of the signal line 38a. The impedance of the coplanar line 38 can be set to a predetermined impedance by adjusting the width of the signal line 38a and the distance between the signal line 38a and the ground planar 38b.

  The high-frequency circuit board 103 operates as follows. At the time of transmission, the radio transmission / reception circuit 92 couples a high frequency signal of 24 GHz to the microstrip line 39b. Microstrip line 39b couples the high frequency signal to signal line 38a, then signal line 38a couples the high frequency signal to microstrip line 39a, and microstrip line 39a couples the high frequency signal to antenna circuit 91. The antenna circuit 91 radiates the high frequency signal as a radio signal. At the time of reception, the antenna circuit 91 converts the received radio signal into a high frequency signal and couples it to the microstrip line 39a. Microstrip line 39a couples the high frequency signal to signal line 38a, then signal line 38a couples the high frequency signal to microstrip line 39b, and microstrip line 39b couples the high frequency signal to radio transceiver circuit 92. . The radio transmission / reception circuit 92 processes the combined high-frequency signal.

  Further, by matching the impedance of the microstrip lines 39a and 39b and the impedance of the coplanar line 38, the influence of impedance mismatch on the transmitted signal is reduced at the connection point between the microstrip lines 39a and 39b and the coplanar line 38. can do.

  On the other hand, when measuring the characteristics of the wireless transmission / reception circuit 92, a connection point between the signal line 38a and the microstrip line 39a (hereinafter, a connection point between the signal line 38a and the microstrip line 39a is referred to as a “connection point 391”. ) And the grounding planar 38b. Next, an inspection terminal is brought into contact with a connection point between the signal line 38a and the microstrip line 39b (hereinafter, a connection point between the signal line 38a and the microstrip line 39b is referred to as “connection point 392”), and measurement is performed.

  An example in the case of measuring the radio transmission / reception circuit 92 on the high-frequency circuit board 103 is shown in FIG. 8, the same reference numerals as those used in FIGS. 1, 2 and 7 have the same functions and the same operations. The microstrip line 39a and the ground planar 38b on the antenna circuit 91 side from the connection point 391 are covered with the electrode plate 22 and short-circuited. The signal needle 25b of the GSG probe 25 for the coplanar line is brought into contact with the connection point 392 as a measurement point, and the ground terminal needles 25a and 25c are brought into contact with the ground planar 38b.

  By covering the connection point 391 and the ground planar 38b with the electrode plate 22 and short-circuiting them, the coplanar line 38 on the antenna circuit 91 side from the connection point 392 which is a measurement point is in a short stub state. Since the interval between the connection point 391 and the connection point 392 is a length obtained by adding a length of a quarter of the wavelength to an integral multiple of the half wavelength of the transmitted signal, it is an integral multiple of the half wavelength of the transmitted signal. A short stub having a length equal to one-fourth of the wavelength is added, and the wave of the high-frequency signal reflected at the connection point 391 is strengthened at the connection point 392, and the connection point 391 side of the coplanar line 38 is high. As a result, only the wireless transmission / reception circuit 92 is apparently connected to the microstrip line 39b. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the wireless transmission / reception circuit 92.

  Conversely, the microstrip line 39b and the ground planar 38b on the wireless transmission / reception circuit 92 side from the connection point 392 are covered with the electrode plate 22 and short-circuited, and the signal needle of the GSG probe 25 for the coplanar line is measured using the connection point 391 as a measurement point. 25b is brought into contact with the connection point 391, and the ground terminal needles 25a and 25c are brought into contact with the ground planar 38b, whereby the microstrip line 39b on the side of the wireless transmission / reception circuit 92 from the connection point 391 becomes a short stub state. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the antenna circuit 91.

  In the high-frequency circuit board 103, the microstrip lines 39a and 39b may have a transition section A that decreases from the width of the microstrip lines 39a and 39b to the width of the signal line 38a toward the connection point with the signal line 38a. .

  By having the transition section A, an abrupt change in impedance can be avoided at the connection point between the coplanar line 38 and the microstrip lines 39a and 39b, and the generation of reflected waves due to impedance mismatching can be reduced. Therefore, the influence of impedance mismatch on the transmitted signal can be reduced at the connection point between the signal line 38a and the microstrip lines 39a and 39b.

  According to the fourth aspect of the present invention, the influence on the signal transmitted between the antenna circuit 91 and the wireless transmission / reception circuit 92 is reduced, and the characteristics of the high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92 are measured. Can do. Therefore, it is possible to provide a high-frequency circuit board that does not require the placement of components such as a circuit for inspection and a connector. In addition, the size of the wireless device can be reduced.

(Embodiment 4)
FIG. 9 is a view showing an outline of the high-frequency circuit board 104 according to the fifth embodiment of the present invention. The high-frequency circuit board 104 is an antenna-integrated radio transceiver in which, for example, a radio transmission / reception circuit 92 that transmits and receives a high-frequency signal of 24 GHz and a planar patch antenna circuit 91 are arranged on the same board. FIG. The high frequency circuit board 104 includes a board 10, coplanar lines 42, 44, 46, an antenna circuit 91, and a wireless transmission / reception circuit 92. 9, the same reference numerals as those used in FIGS. 1 and 5 have the same functions and the same operations.

  The coplanar line 42 includes a signal line 42a and a ground planar 48b. The coplanar line 44 includes a signal line 44a and a ground planar 48b. The coplanar line 46 includes a signal line 46a and a ground planar 48b. A coplanar line 42 and a coplanar line 46 are respectively connected to both ends of the coplanar line 44 in the longitudinal direction. The length in the longitudinal direction of the signal line 44a is a length obtained by adding a quarter of the wavelength to an integral multiple of a half wavelength of the transmitted signal.

  The signal lines 42a, 44a and 46a are transmission lines made of a conductor such as copper, lead, silver, or an alloy thereof. The ground planar 48 b is a ground planar that is connected to a grounding conductor on the back surface or intermediate layer of the substrate 10 through a through hole opened in the substrate 10. Conductors such as copper, lead, silver, and alloys thereof can be used as the material of the ground planar 48b. The ground planar 48b is disposed on the surface of the substrate 10 so as not to be in contact with the signal lines 42a, 44a, and 46a and electrically in contact with the antenna circuit 91 and the wireless transmission / reception circuit 92.

  The impedance of the coplanar line 42 can be set to a predetermined impedance by adjusting the width of the signal line 42a and the distance between the signal line 42a and the ground planar 48b. Similarly, the impedance of the coplanar line 44 adjusts the width of the signal line 44a and the distance between the signal line 44a and the ground planar 48b, and the impedance of the coplanar line 46 is the width of the signal line 46a and the distance between the signal line 46a and the ground planar 48b. By adjusting the value, a predetermined impedance can be obtained.

  The coplanar line 42 is connected to the antenna circuit 91 at a longitudinal end to which the coplanar line 44 is not connected. The impedance of the coplanar line 42 is matched with the impedance of the antenna circuit 91.

  The coplanar line 46 connects the end in the longitudinal direction to which the coplanar line 44 is not connected to the radio transmission / reception circuit 92. The impedance of the coplanar line 46 is matched with the impedance of the radio transmission / reception circuit 92.

  The high frequency circuit board 104 operates as follows. At the time of transmission, the radio transmission / reception circuit 92 couples a high frequency signal of 24 GHz to the signal line 46a. The signal line 46a couples the high frequency signal to the signal line 44a, and the signal line 44a couples the high frequency signal to the signal line 42a. The antenna circuit 91 radiates the high frequency signal as a radio signal. At the time of reception, the antenna circuit 91 converts the received radio signal into a high frequency signal and couples it to the signal line 42a. The signal line 42 a couples the high frequency signal to the signal line 44 a, then the signal line 44 a couples the high frequency signal to the signal line 46 a, and the signal line 46 a further couples the high frequency signal to the radio transceiver circuit 92. The radio transmission / reception circuit 92 processes the combined high-frequency signal.

  Further, by matching the impedance of the coplanar line 42 and the coplanar line 46 with the impedance of the coplanar line 44, the influence of the impedance mismatch on the transmitted signal at the connection point between the coplanar line 42 and the coplanar line 46 and the coplanar line 44. Can be reduced.

  On the other hand, when measuring the characteristics of the wireless transmission / reception circuit 92, a connection point between the signal line 44a and the signal line 42a (hereinafter, a connection point between the signal line 44a and the signal line 42a is referred to as a “connection point 491”). Short the ground planar 48b. Next, measurement is performed by bringing an inspection terminal into contact with a connection point between the signal line 44a and the signal line 46a (hereinafter, a connection point between the signal line 44a and the signal line 46a is referred to as a “connection point 492”).

  An example in the case of measuring the radio transmission / reception circuit 92 on the high-frequency circuit board 104 is shown in FIG. 10, the same reference numerals as those used in FIGS. 1, 2 and 9 have the same functions and the same operations. The signal line 42a and the ground planar 48b on the antenna circuit 91 side from the connection point 491 are covered with the electrode plate 22 and short-circuited. The signal needle 25b of the GSG probe 25 for the coplanar line is brought into contact with the connection point 492 as a measurement point, and the ground terminal needles 25a and 25c are brought into contact with the ground planar 48b.

  The connection point 491 and the ground planar 48b are covered with the electrode plate 22 and short-circuited, so that the coplanar line 44 on the antenna circuit 91 side from the connection point 492 as the measurement point is in a short stub state. The interval between the connection point 491 and the connection point 492 is a length obtained by adding a length of a quarter of the wavelength to the integral multiple of the half wavelength of the transmitted signal, and thus is an integral multiple of the half wavelength of the transmitted signal. Is a short stub with a length of one-fourth of the wavelength added, and the wave of the high frequency signal reflected at the connection point 491 is strengthened at the connection point 492, and the connection point 491 side of the coplanar line 44 is high. As a result, only the wireless transmission / reception circuit 92 is apparently connected to the coplanar line 46. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the wireless transmission / reception circuit 92.

  Conversely, the signal line 46a and the ground planar 48b on the wireless transmission / reception circuit 92 side from the connection point 492 are covered and short-circuited by the electrode plate 22, and the signal needle 25b of the GSG probe 25 for the coplanar line is measured using the connection point 491 as a measurement point. Is brought into contact with the connection point 491 and the ground terminal needles 25a and 25c are brought into contact with the ground planar 48b, whereby the signal line 44a on the wireless transmission / reception circuit 92 side from the connection point 491 enters a short stub state. Therefore, the signal needle 25b of the GSG probe 25 can measure the characteristics of the antenna circuit 91.

  In the high-frequency circuit board 104, the signal lines 42a and 46a may have a transition section A that decreases from the width of the signal lines 42a and 46a to the width of the signal line 44a toward the connection point with the signal line 44a.

  By having the transition section A, an abrupt change in impedance can be avoided at the connection point between the coplanar line 44 and the coplanar lines 42 and 46, and the generation of reflected waves due to impedance mismatching can be reduced. Therefore, it is possible to reduce the influence of impedance mismatch on the transmitted signal at the connection point between the signal line 44a and the signal lines 42a and 46a.

  According to the fifth aspect of the present invention, the influence on the signal transmitted between the antenna circuit 91 and the wireless transmission / reception circuit 92 is reduced, and the characteristics of the high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92 are measured. Can do. Therefore, it is possible to provide a high-frequency circuit board that does not require the placement of components such as inspection circuits and connectors. In addition, the size of the wireless device can be reduced.

(Embodiment 5)
FIG. 11 is a diagram showing an outline of the high-frequency circuit board 105 according to the embodiment of the first invention of the present application. The high-frequency circuit board 105 is, for example, an antenna-integrated radio transceiver in which a radio transmission / reception circuit 92 that transmits and receives a high-frequency signal of 24 GHz and a planar patch type antenna circuit 91 are arranged on the same board. FIG. The high frequency circuit board 105 includes a board 10, a microstrip line 19, an antenna circuit 91, and a wireless transmission / reception circuit 92. 11, the same reference numerals as those used in FIG. 1 perform the same functions and the same operations.

  In the high-frequency circuit board 105, the microstrip line 19 and the ground terminal pads 11 and 13 are arranged so as to have the following positional relationship. The microstrip line 19 and the ground terminal pad 11 are arranged so as not to contact each other. The ground terminal pad 13 is disposed so as not to contact the microstrip line 19 and the ground terminal pad 11 and to be on the ground terminal pad 11 side with respect to the microstrip line 19. Further, an intersection of a virtual perpendicular line extending from the center point of the ground terminal pad 11 to the longitudinal center line of the microstrip line 19 and the center line (hereinafter, an imaginary perpendicular line extending to the longitudinal center line of the microstrip line 19) And an intersection of the center line and the center line (hereinafter referred to as “intersection 591”) and an intersection of the virtual line and the center line (hereinafter referred to as a center line in the longitudinal direction of the microstrip line 19 from the center point of the ground terminal pad 13). The interval between the virtual perpendicular line extending down the center line in the longitudinal direction of the microstrip line 19 and the center line is referred to as an “intersection 592”). The interval between the half-wavelengths of the signal transmitted through the microstrip line 19 is an integral multiple. The ground terminal pads 11 and 13 are arranged so as to be a length obtained by adding a length of a quarter of the wavelength.

  The high-frequency circuit board 105 may be arranged such that the ground terminal pad 13 is opposite to the ground terminal pad 11 side with respect to the microstrip line 19. Furthermore, in the high-frequency circuit board 105 of FIG. 11, the shape of the ground terminal pads 11 and 13 is a square, but may be an arbitrary shape. Further, the microstrip line 19 may have a notch that narrows the width of the microstrip line 19 at the edge facing the ground terminal pads 11 and 13.

  The high frequency circuit board 105 operates as follows. At the time of transmission, the radio transmission / reception circuit 92 couples a high frequency signal of 24 GHz to the microstrip line 19. The high-frequency signal propagates through the microstrip line 19 to reach the antenna circuit 91 and is radiated from the antenna circuit 91 as a radio signal. At the time of reception, the antenna circuit 91 converts the received radio signal into a high frequency signal and couples it to the microstrip line 19. The high-frequency signal propagates through the microstrip line 19 and reaches the wireless transmission / reception circuit 92 and is signal-processed.

  On the other hand, when measuring the characteristics of the wireless transmission / reception circuit 92, the intersection 591 and the ground terminal pad 11 are short-circuited. Next, an inspection terminal is brought into contact with the intersection 592 and measurement is performed.

  An example in the case of measuring the radio transmission / reception circuit 92 on the high-frequency circuit board 105 is shown in FIG. 12, the same reference numerals as those used in FIG. 1 perform the same functions and the same operations. The microstrip line 19 and the ground terminal pad 11 on the antenna circuit 91 side from the intersection 591 are covered with the electrode plate 22 and short-circuited. The signal needle 55b of the GS probe 55 for the coplanar line is brought into contact with the intersection 592, which is a measurement point, and the ground terminal needle 55c is brought into contact with the ground terminal pad 13. The GS probe is a probe for directly contacting a measurement target of a microwave transmission component such as a high-frequency printed circuit board, a high-speed CPU, or a socket, and measuring impedance and circuit characteristics. The structure has two conductive needles such as aluminum and tungsten, one needle for the signal line and the other needle for the grounding.

  By covering the intersection 591 and the ground terminal pad 11 with the electrode plate 22 and short-circuiting them, the microstrip line 19 on the antenna circuit 91 side from the intersection 592 which is a measurement point is in a short stub state. The interval between the intersection 591 and the intersection 592 is a length obtained by adding a quarter of the wavelength to the integral multiple of the half wavelength of the transmitted signal, so that the wavelength is multiplied by the integral multiple of the half wavelength of the transmitted signal. A short stub with a length of one quarter of the length is added. At the intersection 592, the waves of the high-frequency signal reflected at the intersection 591 strengthen each other, and the impedance on the intersection 591 side of the microstrip line 19 becomes very high. Apparently, only the wireless transmission / reception circuit 92 is connected to the microstrip line 19. Therefore, the signal needle 55b of the GS probe 55 can measure the characteristics of the wireless transmission / reception circuit 92.

  Conversely, the microstrip line 19 and the ground terminal pad 13 on the wireless transmission / reception circuit 92 side from the intersection 592 are covered with the electrode plate 22 and short-circuited, and the signal needle 55b of the GS probe 55 is set to the intersection 591 with the intersection 591 as a measurement point. When the ground terminal needle 55c is brought into contact with the ground terminal pad 11, the microstrip line 19 on the side of the wireless transmission / reception circuit 92 from the intersection 591 enters a short stub state. Therefore, the signal needle 55b of the GS probe 55 can measure the characteristics of the antenna circuit 91.

According to the first invention of this application, the influence on the signal transmitted between the antenna circuit 91 and the wireless transmission / reception circuit 92 is reduced, and the characteristics of the high-frequency circuits such as the antenna circuit 91 and the wireless transmission / reception circuit 92 are measured. Can do. Therefore, it is possible to provide a high-frequency circuit board that does not require the placement of components such as a circuit for inspection and a connector. In addition, the size of the wireless device can be reduced.
The high-frequency circuit board 105 has a width in a section from the intersection 591 to the intersection 592 of the microstrip line 19 in a section from the intersection 591 to the antenna circuit 91 and a section from the intersection 592 to the wireless transmission circuit 92. It can also be narrower than the width. When the width in the section from the intersection 591 to the intersection 592 of the microstrip line 19 is narrowed, the section length from the intersection 591 to the intersection 592 is set to an integral multiple of the half wavelength of the transmitted signal, and the high-frequency circuit board 102 in FIG. Similarly, it is preferable to provide a transition section A.

  The arrangement of the microstrip line, the ground terminal pad, and the coplanar line of the high frequency circuit board according to the present invention can be applied not only to the high frequency circuit board but also to a semiconductor inspection circuit such as a CPU or a memory.

It is a figure which shows the outline of the high frequency circuit board 101 which concerns on one Embodiment of this invention 2nd invention. It is an example of a case where a radio transmission / reception circuit 92 is measured on the high-frequency circuit board 101. It is a figure which shows the outline of the high frequency circuit board 101a which concerns on other embodiment of this invention 2nd invention. It is a figure which shows the outline of the high frequency circuit board 101b which concerns on other embodiment of this invention 2nd invention. It is a figure which shows the outline of the high frequency circuit board 102 which concerns on one Embodiment of this invention 3rd invention. It is a figure of an example in the case of measuring the radio | wireless transmission / reception circuit 92 in the high frequency circuit board 102. FIG. It is a figure which shows the outline of the high frequency circuit board 103 which concerns on one Embodiment of this invention 4th invention. It is an example of a case where the radio transmission / reception circuit 92 is measured on the high-frequency circuit board 103. It is a figure which shows the outline of the high frequency circuit board 104 which concerns on one Embodiment of this invention 5th invention. It is a figure of an example in the case of measuring the radio | wireless transmission / reception circuit 92 in the high frequency circuit board 104. FIG. It is a figure showing the outline of high frequency circuit board 105 concerning one embodiment of the 1st invention of this application. It is a figure of an example in the case of measuring the radio | wireless transmission / reception circuit 92 in the high frequency circuit board 105. FIG.

Explanation of symbols

101, 101a, 101b, 102, 103, 104, 105 High frequency circuit board, 10 substrate, 11, 12, 13, 14 Ground terminal pad, 11a, 12a, 13a, 14a, 15a, 16a Ground terminal pad, 17 notch, 19 19b, 29a, 29b, 29c, 39a, 39b Microstrip line, 22 Electrode plate, 25 GSG probe, 55 GS probe, 25a, 25c, 55c Ground terminal needle, 25b, 55b Signal needle, 38, 42, 44 , 46 Coplanar line, 38a, 42a, 44a, 46a Signal line, 38b, 48b Grounded planar, 91 Antenna circuit, 92 Radio transceiver circuit, 191, 192, 293, 591, 592 Intersection, 291, 292, 391, 392, 491 492 Connection point, A Transition section

Claims (12)

Microstrip line,
At least two ground terminal pads that are non-contact with the microstrip line;
With
Of the ground pad terminals, the longitudinal component of the microstrip line at the distance between the center points of the two ground pad terminals is a quarter of the wavelength of an integral multiple of a half wavelength of the signal transmitted through the microstrip line. A high frequency circuit board characterized by having a length plus a length. Microstrip line,
A first ground terminal pad that is non-contact with the microstrip line;
A second ground terminal pad that is non-contact with the microstrip line and disposed on the opposite side of the first ground terminal pad with respect to the microstrip line;
A third ground terminal pad disposed in contact with the microstrip line and the first ground terminal pad, and disposed on the first ground terminal pad side with respect to the microstrip line;
A fourth ground terminal pad disposed in contact with the microstrip line and the second ground terminal pad, and disposed on the second ground terminal pad side with respect to the microstrip line;
With
From the intersection of the first virtual line connecting the center point of the first ground terminal pad and the center point of the second ground terminal pad and the longitudinal center line of the microstrip line,
The distance between the second virtual line connecting the center point of the third ground terminal pad and the center point of the fourth ground terminal pad and the intersection of the center line in the longitudinal direction of the microstrip line is the microstrip line. A high-frequency circuit board having a length obtained by adding a length of a quarter of a wavelength to an integral multiple of a half wavelength of a transmitted signal.   The shape of the first ground terminal pad, the shape of the second ground terminal pad, the shape of the third ground terminal pad or / and the shape of the fourth ground terminal pad are parallel to the longitudinal direction of the microstrip line. The high-frequency circuit board according to claim 2, wherein a width in a direction is narrowed toward the microstrip line.   A notch that narrows the width of the microstrip line is formed at an edge facing the first ground terminal pad, the second ground terminal pad, the third ground terminal pad or / and the fourth ground terminal pad of the microstrip line. The high-frequency circuit board according to claim 2, wherein the high-frequency circuit board is provided. A narrow microstrip line whose length in the longitudinal direction is an integral multiple of half the wavelength of the transmitted signal;
A wide microstrip line connected to both ends in the longitudinal direction of the narrow microstrip line and having a width wider than the width of the narrow microstrip line;
A first grounding terminal pad centered on a first straight line that is non-contact with the narrow microstrip line and the wide microstrip line and intersects the midpoint of one end in the longitudinal direction of the narrow microstrip line;
Non-contact with the narrow microstrip line and the wide microstrip line, located on the opposite side of the first ground terminal pad side with respect to the longitudinal center line of the narrow microstrip line and the first A second ground terminal pad centered on a straight line;
Non-contact with the first ground terminal pad, the narrow microstrip line, and the wide microstrip line, disposed on the first ground terminal pad side with respect to the center line, and the length of the narrow microstrip line A third ground terminal pad centered on a second straight line intersecting the midpoint of the other end of the direction;
Non-contact with the second ground terminal pad, the narrow microstrip line, and the wide microstrip line, disposed on the second ground terminal pad side with respect to the center line, and centered on the second straight line A fourth ground terminal pad;
Non-contact with the first ground terminal pad, the third ground terminal pad, the narrow microstrip line and the wide microstrip line, disposed on the first ground terminal pad side with respect to the center line, and A fifth ground terminal pad centered on a third straight line that intersects the position of a distance obtained by adding a quarter length to an integral multiple of a half wavelength on the center line from one end in the longitudinal direction of the narrow microstrip line When,
Non-contact with the second ground terminal pad, the fourth ground terminal pad, the narrow microstrip line and the wide microstrip line, disposed on the second ground terminal pad side with respect to the center line, and A sixth ground terminal pad centered on the third straight line;
A high-frequency circuit board comprising:   The shape of the first ground terminal pad, the shape of the second ground terminal pad, the shape of the third ground terminal pad, the shape of the fourth ground terminal pad, the shape of the fifth ground terminal pad, and / or the sixth 6. The high-frequency circuit board according to claim 5, wherein the ground terminal pad has a shape in which a width in a direction parallel to a longitudinal direction of the microstrip line becomes narrower toward the microstrip line.   The wide microstrip line has a transition section that decreases from a width of the wide microstrip line to a width of the narrow microstrip line toward a connection point with the narrow microstrip line. 5. The high frequency circuit board according to 5 or 6. A coplanar line having a signal line having a length in which the length of the signal line in the longitudinal direction is an integral multiple of a half wavelength of the transmitted signal plus a quarter of the wavelength;
Microstrip lines respectively connected to both ends in the longitudinal direction of the signal lines of the coplanar lines;
A high-frequency circuit board comprising:   9. The high frequency circuit board according to claim 8, wherein the width of the signal line of the coplanar line is narrower than the width of the microstrip line.   The microstrip line has a transition section that decreases from the width of the microstrip line toward the connection point with the signal line of the coplanar line from the width of the microstrip line to the width of the signal line of the coplanar line. 9. The high frequency circuit board according to 9. A narrow coplanar line having a signal line whose length in the longitudinal direction of the signal line is an integral multiple of a half wavelength of the transmitted signal plus a quarter of the wavelength;
A wide coplanar line connected to both ends in the longitudinal direction of the signal line of the narrow coplanar line and having a signal line wider than the width of the signal line of the narrow coplanar line;
A high-frequency circuit board comprising: The signal line of the wide coplanar line has a transition section that reduces from the width of the wide coplanar line to the width of the signal line of the narrow coplanar line toward a connection point with the signal line of the narrow coplanar line. The high-frequency circuit board according to claim 11, wherein

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