JP2005064676A - High frequency composite component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency composite component in which a pass band can be limited on a low pass-side, which is suitable for miniaturization and in which the characteristic of a balun is kept as it is. <P>SOLUTION: In a first line conductor 311 of a balun transformer 31, one end constitutes an unbalanced signal terminal T1. In a second line conductor 312, one end is connected to the other end of the first line conductor 311. In a third line conductor 313, one end corresponding to the unbalanced signal terminal T1 is connected to a ground terminal T2. A fourth line conductor 314 is combined with the second line conductor 312 with directivity, and one end corresponding to the other end of the second line conductor 312 is connected to a ground terminal T5. In a first filter circuit 32, one end is connected to the other end of the third line conductor 313. The other end of the first filter circuit 32 constitutes a first balanced signal terminal T3. In a second filter circuit 33, one end is connected to the other end of the fourth line conductor 314 and the other end constitutes a second balanced signal terminal T4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high frequency composite component and a mobile communication device, and more particularly to a high frequency composite component combining a balun transformer and a filter circuit and a mobile communication device using the same.

  In general, in a mobile communication device, it is necessary to equally distribute a high-frequency signal to an amplifier or a mixer with a phase shift of 180 degrees, or to synthesize a signal from the amplifier or the mixer with a phase shift of 180 degrees. The balun transformer is used as a means for that purpose, and is arranged on the input side or output side of an IC (transmission / reception circuit) including an amplifier, a mixer, etc., and a balanced signal of the balanced transmission line and an unbalanced signal of the unbalanced transmission line. A high-frequency circuit that converts between the two is configured.

  In the above-described balun transformer, a combination of a filter circuit and a balun transformer has been proposed as means for increasing the selectivity of the used frequency signal. For example, Patent Document 1 discloses a technique for connecting a bandpass filter to an unbalanced terminal of a balun transformer. Patent Document 2 discloses a technique in which a capacitor is connected to each of the balanced lines in parallel, thereby narrowing the band, thereby providing a filter function.

  By the way, for example, in a short-range communication system having a use frequency of 2.4 GHz, a band that needs to be attenuated most is a frequency band of 1.8 to 2.0 GHz with respect to a pass band of 2.4 GHz, and a lower frequency band. Must be constantly decaying. Low frequency attenuation is essential to eliminate interfering waves entering the system.

  Even in the high band, attenuation in the frequency range of 4.8 GHz to 5.0 GHz, which is twice that of the pass band, is required. This high band attenuation is mainly caused by harmonics generated from oscillators in the system. The purpose is to eliminate, and not the purpose of removing the interference wave. If the transmission / reception circuit constituted by the IC has an excellent characteristic with a small harmonic signal, the harmonic frequency does not need to be attenuated so much. However, even in such a case, it is necessary to design the filter unit so as to attenuate only the low band as much as possible from the viewpoint of eliminating the interference wave.

In order to satisfy the above-described requirements by the technique described in Patent Document 1, the number of elements for configuring a band pass increases, and it is not possible to cope with the downsizing required in mobile communication devices. According to the technique described in Patent Document 2, filter characteristics can be realized in a wide frequency range, but it is difficult to attenuate nearby frequencies from the passband.
JP 2002-353834 A JP 2001-168607 A

  An object of the present invention is to provide a high-frequency composite component that is particularly suitable for downsizing and that can maintain the characteristics of a balun transformer as it is, and a mobile communication device using the same, in which the passband limitation on the low frequency side is significant. It is.

  In order to solve the above-described problem, the high-frequency composite component according to the present invention includes a balun transformer, a first filter circuit, and a second filter circuit. The balun transformer includes first to fourth line conductors, and one end of the first line conductor constitutes an unbalanced signal terminal. One end of the second line conductor is connected to the other end of the first line conductor, and the third line conductor is coupled to the first line conductor with directionality, and the unbalanced signal One end corresponding to the service terminal is connected to the ground terminal. The fourth line conductor is coupled to the second line conductor with directivity, and one end corresponding to the other end of the second line conductor is connected to a ground terminal.

  One end of the first filter circuit is connected to the other end of the third line conductor, the other end forms a first balanced signal terminal, and the second filter circuit has one end connected to the fourth line. Are connected to the other end of the line conductor, and the other end constitutes a second balanced signal terminal.

  The high-frequency composite component according to the present invention is used in a mobile communication device such as a mobile phone in combination with an antenna and a transmission / reception circuit. The transmission / reception circuit includes one or both of a transmission circuit and a reception circuit.

  In the mobile communication device, the unbalanced signal terminal is connected to the antenna, the first balanced signal terminal and the second balanced signal terminal are connected to the transmission / reception circuit, and the ground terminal is grounded.

  As already described, in a mobile communication device, it is necessary to equally distribute a high-frequency signal to an amplifier or a mixer with a phase difference of 180 degrees, or to synthesize a signal from an amplifier or a mixer with a phase difference of 180 degrees. is there. The high-frequency composite component according to the present invention is used as means for that purpose, and is disposed on the input side or output side of a transmission / reception circuit including an antenna, an amplifier, a mixer, and the like.

  The unbalanced signal supplied from the antenna side to the first line conductor and the second line conductor is coupled to the first line conductor and the second line conductor with directivity, and the third line conductor and the fourth line. The signal is converted into a balanced signal by the conductor and supplied to the transmission / reception circuit side from the first balanced signal terminal and the second balanced signal terminal. A signal supplied from the transmission / reception circuit is transmitted from the third line conductor and the fourth line conductor to the first line conductor and the second line conductor and supplied to the antenna.

  The mutual conversion between the unbalanced signal and the balanced signal described above is already known. A feature of the present invention is that it includes a first filter circuit and a second filter circuit. One end of the first filter circuit is connected to the other end of the third line conductor, and the other end constitutes a first balanced signal terminal. The second filter circuit has one end connected to the other end of the fourth line conductor and the other end constituting a second balanced signal terminal.

  According to this configuration, it is possible to limit the pass band by specifically attenuating the lower band side than the pass band while reducing the size. Therefore, according to the present invention, it is possible to reliably remove interference waves that enter the system of the mobile communication device. Moreover, the characteristics of the balun transformer can be maintained as they are.

  In addition, since the first filter circuit and the second filter circuit can be configured by a simple circuit configuration in which a capacitor and an inductor are combined, various filter characteristics can be imparted while achieving miniaturization. Further, even when an element for matching is added, the size can be sufficiently reduced in comparison with the prior art.

  Furthermore, since the number of circuit elements constituting the first filter circuit and the second filter circuit can be small, it is extremely suitable for obtaining a small multilayer high-frequency composite component.

  As described above, the present invention provides a high-frequency composite component that is particularly suitable for downsizing, and that can maintain the characteristics of a balun transformer as it is, and a mobile communication device using these components, in which the passband limitation on the low frequency side is remarkable. Can do.

  Other objects, configurations, and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

  FIG. 1 shows the configuration of a mobile communication device using a high-frequency composite component according to the present invention. The illustrated mobile communication apparatus includes an antenna 1, a high-frequency composite component 3 according to the present invention, an external circuit 4, and the like. The high-frequency composite component 3 includes a balun transformer 31, a first filter circuit 32, and a second filter circuit 32.

  The balun transformer 31 includes first to fourth line conductors 311 to 314. The first to fourth line conductors 311 to 314 are configured as, for example, (λ / 4) strip lines or microstrip lines. The first conductor line 311 and the second line conductor 312 are connected in series to form an unbalanced line. One end of the first line conductor 311 forms an unbalanced signal terminal T1. The unbalanced signal terminal T1 is connected to the antenna 1. One end of the second line conductor 312 is connected to the other end of the first line conductor 311.

  The third line conductor 313 is coupled to the first line conductor 311 with directionality by electromagnetic induction, and one end corresponding to the unbalanced signal terminal T1 is connected to the ground terminal T2. The ground terminal T2 is grounded.

  The fourth line conductor 314 is coupled to the second line conductor 312 with directionality by electromagnetic induction, and one end corresponding to the other end of the second line conductor 312 is connected to the ground terminal T5. The ground terminal T5 is grounded. The ground terminals T2 and T5 may be combined.

  One end of the first filter circuit 32 is connected to the other end of the third line conductor 313. The other end of the first filter circuit 32 constitutes a first balanced signal terminal T3. One end of the second filter circuit 33 is connected to the other end of the fourth line conductor 314, and the other end is the first. 2 balanced signal terminals T4 are formed.

  The transmission / reception circuit 4 includes a transmission circuit and a reception circuit, and is generally constituted by an IC (integrated circuit element). The transmission / reception circuit 4 is connected to a first balanced signal terminal T3 led from the first filter circuit 32 and a second balanced signal terminal T4 led from the second filter circuit 33.

  As already described, in the mobile communication device, the high-frequency signal is equally distributed to the amplifier and mixer by shifting the phase by 180 degrees in the transmission / reception circuit 4, or the signal from the amplifier and mixer is phase-shifted by 180 degrees. It is necessary to synthesize by shifting. In the present invention, the high-frequency composite component 3 is used as means for that purpose, and is disposed on the input side or output side of the antenna 1 and the transmission / reception circuit 4 including an amplifier, a mixer, and the like.

  The unbalanced signal supplied from the antenna 1 to the first line conductor 311 and the second line conductor 312 is converted into a balanced signal by the third line conductor 313 and the fourth line conductor 314, and the first balanced signal is obtained. The signal is supplied to the transmission / reception circuit 4 from the signal terminal T3 and the second balanced signal terminal T4. A signal supplied from the transmission / reception circuit 4 is transmitted from the third line conductor 313 and the fourth line conductor 314 to the first line conductor 311 and the second line conductor 312 and supplied to the antenna 1.

  The above-described mutual conversion between an unbalanced signal and a balanced signal is well known. A feature of the present invention is that it includes a first filter circuit 32 and a second filter circuit 33. One end of the first filter circuit 32 is connected to the other end of the third line conductor 313, and the other end constitutes a first balanced signal terminal T3. The second filter circuit 33 has one end connected to the other end of the fourth line conductor 314 and the other end constituting the second balanced signal terminal T4.

  According to this configuration, it is possible to limit the pass band by specifically attenuating the lower band side than the pass band while reducing the size. Therefore, according to the present invention, it is possible to reliably remove interference waves that enter the system of the mobile communication device. Moreover, the characteristics of the balun transformer 31 can be maintained as they are.

  In addition, since the first filter circuit 32 and the second filter circuit 33 can be configured by a simple circuit configuration in which a capacitor or an inductor is combined, various filter characteristics can be imparted while achieving miniaturization. Further, even when an element for matching is added, the size can be sufficiently reduced in comparison with the prior art. Furthermore, since the number of circuit elements constituting the first filter circuit 32 and the second filter circuit 33 is small, it is extremely suitable for obtaining a small multilayer high-frequency composite component.

  Next, a specific description will be given with reference to FIGS. 2 to 10, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 2 is an electric circuit diagram showing a specific example of the high-frequency composite component according to the present invention. In this embodiment, the first filter circuit 32 includes a first capacitor C1. The first capacitor C1 is connected between the other end of the third line conductor 313 and the first balanced signal terminal T3. The second filter circuit 33 includes a second capacitor C2, and the second capacitor C2 is connected between the other end of the fourth line conductor 314 and the second balanced signal terminal T4.

  FIG. 3 is a circuit diagram used to obtain the reflection and transmission characteristics of the high-frequency composite component shown in FIG. 2, and FIG. 4 is a circuit diagram used to obtain the reflection and transmission characteristics shown in FIG. In FIG. 3, reference numeral S11 indicates reflection characteristics, and reference numeral S21 indicates transmission characteristics. The frequency used is 2.4 GHz. In FIG. 4, by inserting ideal transformers into balanced signal terminals T3 and T4, this kind of high-frequency composite component normally used as a 3-port can be regarded as a 2-port circuit. It was measured.

  When attention is paid to the pass characteristic S21 shown in FIG. 3, it can be seen that the low frequency side of the operating frequency 2.4 GHz is particularly attenuated, and the pass band can be limited. Therefore, according to the present invention, it is possible to reliably remove interference waves that enter the system of the mobile communication device. When attention is paid to the reflection characteristic S11, a reflection attenuation pole is generated at a use frequency of 2.4 GHz, and the reflection can be minimized at 2.4 GHz. Moreover, the characteristics of the balun transformer 31 can be maintained as they are.

  Further, since the first filter circuit 32 and the second filter circuit 33 can be configured with a simple circuit configuration having the first and second capacitors C1 and C2, the size can be reduced.

  FIG. 5 is an electric circuit diagram showing another specific example of the high-frequency composite component according to the present invention. In this embodiment, the first filter circuit 32 includes a first capacitor C1 and a first inductor L1. The first capacitor C1 is connected between the other end of the third line conductor 313 and the first balanced signal terminal T3. The first inductor L1 is connected in parallel with the first capacitor C1.

  The second filter circuit 33 includes a second capacitor C2 and a second inductor L2. The second capacitor C2 is connected between the other end of the fourth line conductor 314 and the second balanced signal terminal T4. The second inductor L2 is connected in parallel with the second capacitor C2.

  FIG. 6 shows the reflection and transmission characteristics of the high-frequency composite part shown in FIG. 5, and was measured by the measurement circuit shown in FIG. The frequency used is 2.4 GHz. In FIG. 6, paying attention to the pass characteristic S21, the low band side is particularly attenuated from the use frequency of 2.4 GHz, and the pass band can be limited. Moreover, a notch (attenuation pole) P1 is generated in the vicinity of 1.8 GHz, which is on the lower frequency side than the operating frequency 2.4 GHz. Therefore, the interference wave that enters the system of the mobile communication device can be more reliably removed. When attention is paid to the reflection characteristic S11, a reflection attenuation pole is generated at a use frequency of 2.4 GHz, and the reflection can be minimized at 2.4 GHz. Moreover, the characteristics of the balun transformer 31 can be maintained as they are.

  The first filter circuit 32 and the second filter circuit 33 can be configured with a simple circuit configuration including the first and second capacitors C1 and C2 and the first and second inductors L1 and L2. Can be achieved.

  FIG. 7 is an electric circuit diagram showing still another specific example of the high-frequency composite component according to the present invention. In this embodiment, the first filter circuit 32 includes a first capacitor C1 and a third capacitor C3. The first capacitor C1 is connected between the other end of the third line conductor 313 and the first balanced signal terminal T3. The third capacitor C3 is connected between the first balanced signal terminal T3 and the ground terminal T5.

  The second filter circuit 33 includes a second capacitor C2 and a fourth capacitor C4. The second capacitor C2 is connected between the other end of the fourth line conductor 314 and the second balanced signal terminal T4. The fourth capacitor C4 is connected between the second balanced signal terminal T4 and the ground terminal T5.

  FIG. 8 shows the reflection and transmission characteristics of the high-frequency composite part shown in FIG. 7, and was measured by the measurement circuit shown in FIG. The frequency used is 2.4 GHz. In FIG. 8, paying attention to the pass characteristic S21, the attenuation is significant on the lower frequency side than the operating frequency 2.4 GHz. Therefore, the interference wave that enters the system of the mobile communication device can be more reliably removed. Moreover, it is also attenuated on the higher frequency side than the operating frequency of 2.4 GHz. Therefore, the pass band can be limited on the low frequency side and the high frequency side. If attention is paid to the reflection characteristic S11, a reflection attenuation pole is generated at a use frequency of 2.4 GHz, and reflection can be minimized at a use frequency of 2.4 GHz.

  Further, since the first filter circuit 32 and the second filter circuit 33 can be configured with a simple circuit configuration having the first to fourth capacitors C1 to C4, the size can be reduced.

  FIG. 9 is an electric circuit diagram showing still another specific example of the high-frequency composite component according to the present invention. In this embodiment, the first filter circuit 32 includes a first capacitor C1, a first inductor L1, and a third capacitor C3. The first capacitor C1 is connected between the other end of the third line conductor 313 and the first balanced signal terminal T3. The first inductor L1 is connected in parallel with the first capacitor C1. The third capacitor C3 is connected between the first balanced signal terminal T3 and the ground terminal T5.

  The second filter circuit 33 includes a second capacitor C2, a second inductor L2, and a fourth capacitor C4. The second capacitor C2 is connected between the other end of the fourth line conductor 314 and the second balanced signal terminal T4. The second inductor L2 is connected in parallel with the second capacitor C2. The fourth capacitor C4 is connected between the second balanced signal terminal T4 and the ground terminal T5.

  FIG. 10 shows the reflection and transmission characteristics of the high-frequency composite part shown in FIG. 9, and was measured by the measurement circuit shown in FIG. The frequency used is 2.4 GHz. In FIG. 10, when attention is paid to the pass characteristic S21, the low frequency side is particularly attenuated from the use frequency of 2.4 GHz. Moreover, a notch (attenuation pole) P1 is generated in the vicinity of 1.8 GHz, which is on the lower frequency side than the operating frequency 2.4 GHz. Therefore, the interference wave that enters the system of the mobile communication device can be more reliably removed.

  Furthermore, it is attenuated not only on the low frequency side but also on the high frequency side than the operating frequency of 2.4 GHz. Therefore, the pass band can be limited on the low frequency side and the high frequency side. If attention is paid to the reflection characteristic S11, a reflection attenuation pole is generated at a use frequency of 2.4 GHz, and reflection can be minimized at a use frequency of 2.4 GHz.

  In addition, the first filter circuit 32 and the second filter circuit 33 can be configured with a simple circuit configuration including the first to fourth capacitors C1 to C4 and the first and second inductors L1 and L2. Can be achieved.

  Next, a specific structure of the high-frequency composite component shown in FIGS. 2, 5, 7, and 9 will be described with reference to FIGS.

  11 is an external perspective view of the high-frequency composite component 3 according to the present invention, and FIG. 12 is an exploded perspective view showing the internal structure of the high-frequency composite component 3 having the circuit configuration shown in FIG. The purpose of FIG. 12 is to show line conductor or capacitor electrode patterns provided between the functional layers.

  The illustrated high-frequency composite component 3 includes an insulating base 7. The insulating base 7 is formed by laminating a plurality of functional layers 71 to 78. The functional layers 71 to 78 can use any of an organic material, a ceramic material, or a composite material in which both are mixed. For the functional layers 71 to 78, material properties such as thickness, relative dielectric constant, and Q are selected according to the role and function of each layer.

  A ground electrode GND <b> 1 is formed on the surface of the first functional layer 71. The ground electrode GND <b> 1 is widely formed on one surface of the first functional layer 71 leaving a slight gap from the outer edge of the first functional layer 71. Terminal connections are provided on opposite sides of the ground electrode GND1, and the ground electrode GND1 is connected to the ground terminals T2 and T5 (see FIGS. 1, 2, and 11) via the terminal connection. . Although not shown in FIG. 3, as apparent from FIG. 11, a functional layer that completely covers the ground electrode GND <b> 1 may be provided on the surface of the first functional layer 71.

  A lead conductor pattern 721 is provided between the first functional layer 71 and the second functional layer 72. One end of the lead conductor pattern 721 is connected to the terminal T <b> 1 (see FIGS. 1, 2, and 11), and the other end is connected to a through-hole (via hole) conductor 722. The through-hole conductor 722 passes through the second functional layer 72.

  Between the second functional layer 72 and the third functional layer 73, a first line conductor 311 and a second line conductor 312 constituting the balun transformer 31 are provided. The first line conductor 311 and the second line conductor 312 are formed in a spiral shape so as to be, for example, a (λ / 4) strip line or a microstrip line, and are continuous with each other on the outer periphery thereof. . A through-hole conductor 722 that penetrates the second functional layer 72 is connected to the inner end of the first line conductor 311.

  Between the third functional layer 73 and the fourth functional layer 74, a third line conductor 313 and a fourth line conductor 314 that form the balun transformer 31 are formed. The third line conductor 313 and the fourth line conductor 314 are formed in a spiral shape so as to be, for example, a (λ / 4) strip line or a microstrip line, and are continuous with each other on the outer periphery thereof. . The third line conductor 313 is electromagnetically coupled to the first line conductor 311 via the third functional layer 73, and the fourth line conductor 314 is connected to the second line conductor via the third functional layer 73. 312 is electromagnetically coupled.

  The inner ends of the third line conductor 313 and the fourth line conductor 314 are connected to the through-hole conductors 741 and 742. In addition, a through-hole conductor 743 is provided in a substantially middle portion of the line conductors connected to the outer peripheral portions of the third line conductor 313 and the fourth line conductor 314. The through-hole conductors 741 to 743 penetrate the fourth functional layer 74.

  A ground electrode GND <b> 2 is formed between the fourth functional layer 74 and the fifth functional layer 75. The ground electrode GND <b> 2 is widely formed on one surface of the fifth functional layer 75 leaving a slight gap from the outer edge of the fifth functional layer 75. Terminal connections are provided on opposite sides of the ground electrode GND2, and the ground electrode GND2 is connected to the grounded terminals T2 and T5 (see FIGS. 1, 2, and 11) via the terminal connection. The Through-hole conductors 751, 752, and 753 that overlap with the through-hole conductors 741 to 743 are provided in the surface of the ground electrode GND2. A ring-shaped insulating gap is provided around the through-hole conductors 751 and 752, and the through-hole conductors 751 and 752 are electrically insulated from the ground electrode GND2 by the insulating gap. In a state where the fourth functional layer 74 and the fifth functional layer 75 are overlapped, the through-hole conductors 741 to 743 provided in the third line conductor 313 and the fourth line conductor 314 are the through-hole conductors 751 to 751. 753 is connected.

  The first filter circuit 32 and the second filter circuit are provided between the fifth functional layer 75 and the sixth functional layer 76 and between the sixth functional layer 76 and the seventh functional layer 77. 33 is formed. First, between the fifth functional layer 75 and the sixth functional layer 76, a capacitor electrode C11 for the capacitor C1 constituting the first filter circuit 32 and a capacitor constituting the second filter circuit 33 are provided. A capacitor electrode C21 for C2 is provided. The capacitor electrodes C11 and C21 are formed in a planar shape at positions overlapping with the through-hole conductors 751 and 752 that penetrate the fifth functional layer 75. Therefore, when the fifth functional layer 75 and the sixth functional layer 76 are overlapped, the capacitor electrodes C11 and C21 are connected to the third line conductor 313 by the through-hole conductors 751 and 752 penetrating the fifth functional layer 75. And the inner end of the fourth line conductor 314.

  Next, between the sixth functional layer 76 and the seventh functional layer 77, a capacitor electrode C12 for the capacitor C1 constituting the first filter circuit 32 and a second filter circuit 33 are formed. A capacitor electrode C22 for the capacitor C2 is provided. The capacitor electrodes C12 and C22 are formed in a planar shape at positions overlapping the capacitor electrodes C11 and C21. Therefore, when the sixth functional layer 76 and the seventh functional layer 77 are overlapped, the capacitor electrode C11 and the capacitor electrode C12 face each other via the sixth functional layer 76, and the sixth functional layer 76 is made to be a capacitance layer. The capacitor C1 is formed. In addition, the capacitor electrode C21 and the capacitor electrode C22 are opposed to each other via the sixth functional layer 76, and the capacitor C2 having the sixth functional layer 76 as a capacitance layer is formed.

  Since the capacitor electrode C11 and the capacitor electrode C21 are also opposed to the ground electrode GND2 existing between the fourth functional layer 74 and the fifth functional layer 75, a capacitance is generated also in this portion. As a means for avoiding the influence, the thickness of the fifth functional layer 75 may be about 2-3 times thicker than the thickness of the sixth functional layer 76.

  The edge of the capacitor electrode C12 is led to the side end surfaces of the sixth and seventh functional layers 76 and 77, and is connected to the first balanced signal terminal T3. The edge of the capacitor electrode C22 is also led to the side end faces of the sixth and seventh functional layers 76 and 77 and connected to the second balanced signal terminal T4.

  A ground electrode GND <b> 3 is provided between the seventh functional layer 77 and the eighth functional layer 78. The ground electrode GND3 is widely formed on one surface of the eighth functional layer 78 leaving a slight gap from the outer edge of the eighth functional layer 78. Terminal connections are provided on opposite sides of the ground electrode GND3, and the ground electrode GND3 is connected to the grounded terminals T2 and T5 (see FIGS. 1, 2, and 11) through the terminal connection. The A through-hole conductor 783 that overlaps the through-hole conductor 773 provided in the seventh functional layer 77 is provided in the plane of the ground electrode GND3.

  Since the capacitor electrodes C12 and C22 are also opposed to the ground electrode GND3 existing between the seventh functional layer 77 and the eighth functional layer 78, a capacitance is generated also in this portion. As a means for avoiding the influence, the thickness of the seventh functional layer 77 may be about 2-3 times thicker than the thickness of the sixth functional layer 76.

  The embodiment shown in FIG. 12 has only the first capacitor C1 and the second capacitor C2 as circuit elements constituting the first filter circuit 32 and the second filter circuit 33. It is also very suitable for obtaining composite parts.

  FIG. 13 is an exploded perspective view showing the internal structure of the high-frequency composite component 3 having the circuit configuration shown in FIG. In the figure, the same components as those shown in FIG. 12 are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, the first filter circuit 32 and the second filter circuit 33 are formed between the fifth functional layer 75 and the sixth functional layer 76. The first filter circuit 32 includes a capacitor electrode C11 for the capacitor C1 and a line conductor constituting the inductor L1. The capacitor electrode C11 is formed in a planar shape at a position overlapping the through-hole conductor 751 that penetrates the fifth functional layer 75. Accordingly, when the fifth functional layer 75 and the sixth functional layer 76 are stacked, the capacitor electrode C11 penetrates the through-hole conductor 751 that penetrates the fifth functional layer 75 and the fourth functional layer 74. The through-hole conductor 741 is connected to the inner end of the third line conductor 313.

  The line conductor constituting the inductor L1 of the first filter circuit 32 has one end connected to the capacitor electrode C11 and the other end where the first balanced signal terminal T3 (see FIGS. 1, 5, and 11) is located. And is connected to the first balanced signal terminal T3.

  The second filter circuit 33 includes a capacitor electrode C21 for the capacitor C2 and a line conductor that constitutes the inductor L2. The capacitor electrode C <b> 21 is formed in a planar shape at a position overlapping the through-hole conductor 752 that penetrates the fifth functional layer 75. Therefore, when the fifth functional layer 75 and the sixth functional layer 76 are overlapped, the capacitor electrode C21 penetrates the through-hole conductor 752 that penetrates the fifth functional layer 75 and the fourth functional layer 74. The through-hole conductor 742 is connected to the inner end of the fourth line conductor 314.

  In the embodiment shown in FIG. 13, the circuit elements constituting the first filter circuit 32 and the second filter circuit 33 are the first and second capacitors C1 and C2, and the first elements formed at the same positions as these. Since only the first inductor L1 and the second inductor L2 are provided, a small multilayer high-frequency composite component can be obtained.

  FIG. 14 is an exploded perspective view showing the internal structure of the high-frequency composite component 3 having the circuit configuration shown in FIG. In the figure, the same components as those shown in FIG. 12 are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, the thicknesses of the fifth functional layer 75 and the seventh functional layer 77 are approximately the same as the thickness of the sixth functional layer 76, and the capacitor electrode C11, the capacitor electrode C21, and the fourth functional layer 74 are formed. And the ground electrode GND2 existing between the fifth functional layer 75 and the ground existing between the capacitor electrodes C12 and C22 and the seventh functional layer 77 and the eighth functional layer 78. The third capacitor C3 and the fourth capacitor C4 are obtained by the facing relationship with the electrode GND3.

  Therefore, the embodiment shown in FIG. 14 has a small and thin laminated high frequency in spite of having an additional third capacitor C3 and a fourth capacitor C4 in comparison with FIG. Composite parts can be obtained.

  FIG. 15 is an exploded perspective view showing the internal structure of the high-frequency composite part 3 having the circuit configuration shown in FIG. In the figure, the same reference numerals are given to the same components as those shown in FIG. In this embodiment, the thicknesses of the fifth functional layer 75 and the seventh functional layer 77 are approximately the same as the thickness of the sixth functional layer 76, and the capacitor electrode C11, the capacitor electrode C21, and the fourth functional layer 74 are formed. And the ground electrode GND2 existing between the fifth functional layer 75 and the ground existing between the capacitor electrodes C12 and C22 and the seventh functional layer 77 and the eighth functional layer 78. The third capacitor C3 and the fourth capacitor C4 are obtained by the facing relationship with the electrode GND3.

  Accordingly, the embodiment shown in FIG. 15 has a small and thin multilayer high frequency in spite of having an additional third capacitor C3 and a fourth capacitor C4 in contrast to FIG. Composite parts can be obtained.

  While the present invention has been described with reference to the embodiment, it is needless to say that the present invention is not limited to this embodiment, and various modifications and changes can be made within the scope of the claims.

It is a figure which shows the structure of the mobile communication apparatus using the high frequency composite component which concerns on this invention. It is an electric circuit diagram which shows the specific example of the high frequency composite component which concerns on this invention. It is the reflection and transmission characteristic of the high frequency composite component shown in FIG. FIG. 4 is a circuit diagram provided to obtain the reflection and transmission characteristics shown in FIG. 3. It is an electric circuit diagram which shows another specific example of the high frequency composite component which concerns on this invention. 6 shows reflection and transmission characteristics of the high-frequency composite part shown in FIG. It is an electric circuit diagram which shows another specific example of the high frequency composite component which concerns on this invention. 8 shows reflection and transmission characteristics of the high-frequency composite part shown in FIG. It is an electric circuit diagram which shows another specific example of the high frequency composite component which concerns on this invention. 10 shows the reflection and transmission characteristics of the high-frequency composite part shown in FIG. 1 is an external perspective view of a high-frequency composite component according to the present invention. It is a disassembled perspective view which shows the internal structure of the high frequency composite component which has a circuit structure shown in FIG. It is a disassembled perspective view which shows the internal structure of the high frequency composite component 3 which has a circuit structure shown in FIG. It is a disassembled perspective view which shows the internal structure of the high frequency composite component 3 which has a circuit structure shown in FIG. It is a disassembled perspective view which shows the internal structure of the high frequency composite component 3 which has a circuit structure shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 7 Insulation base | substrate 31 Balun transformer 32 1st filter circuit 33 2nd filter circuit 71-78 Functional layer 311 1st line conductor 312 2nd line conductor 313 3rd line conductor 314 4th line conductor

Claims (7)

A high-frequency composite component including a balun transformer, a first filter circuit, and a second filter circuit,
The balun transformer includes first to fourth line conductors,
One end of the first line conductor constitutes an unbalanced signal terminal,
The second line conductor has one end connected to the other end of the first line conductor,
The third line conductor is coupled to the first line conductor with directionality, and one end corresponding to the unbalanced signal terminal is connected to a ground terminal,
The fourth line conductor is coupled to the second line conductor with directionality, and one end corresponding to the other end of the second line conductor is connected to a ground terminal,
One end of the first filter circuit is connected to the other end of the third line conductor, and the other end constitutes a first balanced signal terminal,
The second filter circuit is a high-frequency composite component having one end connected to the other end of the fourth line conductor and the other end constituting a second balanced signal terminal. A high-frequency composite component including an insulating base, a balun transformer, a first filter circuit, and a second filter circuit,
The insulating base has a plurality of functional layers,
The balun transformer includes first to fourth line conductors, and is disposed between the functional layers.
The first line conductor has one end connected to an unbalanced signal terminal provided on the outer surface of the insulating base,
One end of the second line conductor is connected to the other end of the first line conductor inside the functional layer,
The third line conductor is coupled to the first line conductor with directionality inside the functional layer, and one end corresponding to the unbalanced signal terminal is provided on the outer surface of the insulating base. Connected to the terminal,
The fourth line conductor is coupled with the second line conductor in a direction within the functional layer, and one end corresponding to the other end of the second line conductor is provided on the outer surface of the insulating base. Connected to the ground terminal
The first filter circuit has a circuit element conductor disposed between the functional layers, one end connected to the other end of the third line conductor inside the functional layer, and the other end connected to the insulating base. Connected to the first balanced signal terminal provided on the outer surface of
The second filter circuit has a circuit element conductor disposed between the functional layers, one end connected to the other end of the fourth line conductor inside the functional layer, and the other end of the insulating base. A high-frequency composite component connected to a second balanced signal terminal provided on the outer surface. The high-frequency composite component according to claim 1 or 2,
The first filter circuit includes a first capacitor, and the first capacitor is connected between the other end of the third line conductor and the first balanced signal terminal;
The second filter circuit includes a second capacitor, and the second capacitor is connected between the other end of the fourth line conductor and the second balanced signal terminal. . The high-frequency composite component according to claim 1 or 2,
The first filter circuit includes a first capacitor and a first inductor, and the first capacitor is connected between the other end of the third line conductor and the first balanced signal terminal. The first inductor is connected in parallel with the first capacitor,
The second filter circuit includes a second capacitor and a second inductor, and the second capacitor is connected between the other end of the fourth line conductor and the second balanced signal terminal. A high-frequency composite component connected in between, wherein the second inductor is connected in parallel with the second capacitor. The high-frequency composite component according to claim 1 or 2,
The first filter circuit includes a first capacitor and a third capacitor, and the first capacitor is interposed between the other end of the third line conductor and the first balanced signal terminal. The third capacitor is connected between the first balanced signal terminal and the ground terminal;
The second filter circuit includes a second capacitor and a fourth capacitor, and the second capacitor is interposed between the other end of the fourth line conductor and the second balanced signal terminal. The high-frequency composite component is connected, and the fourth capacitor is connected between the second balanced signal terminal and the ground terminal. The high-frequency composite component according to claim 1 or 2,
The first filter circuit includes a first capacitor, a first inductor, and a third capacitor, and the first capacitor includes the other end of the third line conductor and the first balanced signal. The first inductor is connected in parallel with the first capacitor, and the third capacitor is connected between the first balanced signal terminal and the ground terminal. Connected between,
The second filter circuit includes a second capacitor, a second inductor, and a fourth capacitor, and the second capacitor includes the other end of the fourth line conductor and the second balanced signal. And the second inductor is connected in parallel with the second capacitor, and the fourth capacitor is connected between the second balanced signal terminal and the ground terminal. High frequency composite parts connected between. A mobile communication device including an antenna, a transmission / reception circuit, and a high-frequency composite component,
The transmission / reception circuit includes at least one of a transmission circuit and a reception circuit,
The high-frequency composite component according to any one of claims 1 to 6, wherein the unbalanced signal terminal is connected to the antenna, and the first balanced signal terminal and the second balanced signal are connected. A mobile communication device in which a terminal is connected to the transmission / reception circuit and the ground terminal is grounded.

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