KR100431938B1 - A monoblock dual-band duplexer - Google Patents

Abstract

The present invention relates to an integrated dual band duplexer, wherein the first and second duplexers, which have conductive surfaces coated on the outer surface except for the open surface and pass different frequency bands with one surface as an open surface, have a predetermined distance from each other. A duplexer portion formed integrally with each open surface facing each other, and having a concave groove formed toward an open surface from a short circuit surface positioned in an opposite direction of each open surface so as to distinguish a transmitting end and a receiving end of each duplexer, and first and second duplexer portions; A common antenna part formed at the center of the dielectric block to which the duplexers are connected to each other so that the antenna terminals of the second dielectric filter are shared with each other, and the common antenna part is formed as a transmission line between the common antenna part and the first and second duplexers, respectively. Impedance matching section for matching the impedance of the negative and the first and second duplexer As a result, two duplexers having different pass frequency bands can be implemented as a single dielectric block, thereby integrating a dual band duplexer into a printed circuit board (PCB) of the terminal to enable surface mounting at once, thereby simplifying the manufacturing process. In addition, the manufacturing cost can be expected to be reduced, as well as the advantage that can be applied to a small terminal.

Description

A monoblock dual-band duplexer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer for filtering transmission and reception frequencies, and more particularly, to an integrated dual band duplexer which can be surface mounted at a time by integrating a dual band duplexer by forming two duplexers having different pass frequency bands as one dielectric block. will be.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual band duplexer for filtering transmission and reception frequencies. In particular, two duplexers having different pass frequency bands are formed as one dielectric block, and a diplexer is added to the bottom surface to integrate the duplexers of each band. An integrated dual band duplexer that can be surface mounted.

In the information age, the use of mobile communication devices using high frequency circuits such as cellular terminals and PCS terminals is increasing rapidly. Therefore, the components used in the high frequency circuit have a lot of difficulties in design to effectively prevent the interference of the frequency and suppress the harmonics.

Among the components used in the high frequency circuit, the dielectric filter is composed of a band pass filter or a band stop filter for passing or blocking only necessary signals among high frequency signals, and is a front-end of a wireless device. End) It is applied to the transceiver.

The implementation method of the dielectric filter is classified into an integrated filter and a resonator coupled filter. In the integrated filter, a resonator hole is formed in a dielectric block composed of one block, and an input / output electrode and an electrode pattern for coupling a resonance period and a coupling between the resonator and the ground are formed. At this time, a capacitance exists between the electrode patterns, and by adjusting the capacitance, the coupling value between the resonators and the resonant frequency of the resonator can be adjusted.

On the other hand, the resonator coupling type filter is a structure in which a plurality of resonators are coupled through a coupling board to form a capacitor so that a predetermined capacitance value appears on the board to control coupling between the resonators. It is.

The integrated duplexer according to the related art shown in FIG. 1 has a dielectric block D10 having one surface as an open surface 12 and an outer conductor formed by applying a conductive material to the outer surface except for the open surface 12. First to eighth resonators R11, R12, R13, in which an inner conductor is formed by applying a conductive material to the inner surface of the hole penetrating from the one open surface 12 of the dielectric block D10 to the corresponding other rear surface 13. First and second R14, R15, R16, R17, and R18, and formed on the open surface 12 and the upper surface 11 of the dielectric block D10 to perform the function of signal input and output to the band pass filter. And second and third input / output electrodes P1, P2, and P3.

At this time, one end of the resonators R11 to R18 is a short end connected to the ground at the rear surface 13 of the dielectric block, and the open surface 12 is a quarter wave resonator to be the open end of the resonators R11 to R18. It works. The second to fourth resonators R12, R13, and R14 and the fifth internal seventh resonators R15, R16, and R17 of the dielectric block form a band pass filter, and the first and eighth resonators R11 and R18 form attenuation poles. It is operated as a band stop filter.

The first, second and third input / output electrodes P1 are operated as input / output ports of a band pass filter, and the first and third input / output electrodes P1 and P3 are shared between the band stop filter and an adjacent resonator hole. .

Referring to the operation of the conventional integrated duplexer configured as described above are as follows.

First, a capacitive coupling is performed between the electrodes around the resonators R11 to R18 on the open surface 12 of the dielectric block D10 and between the hole electrodes around the resonators R11 to R18 and the input / output electrodes P1, P2, and P3. Is formed.

First, the receiver filter operates as follows. The signal input to the second input / output electrode P2 is a third resonator R13 due to capacitive coupling between the second input / output electrode P2, which is an input port on the side of the bandpass filter, and the electrode around the hole of the fourth resonator R14. The signal transmission between the second to fourth resonators R12 to R14 consists of an electromagnetic field coupling formed between the resonators R12 to R14 and a capacitive coupling between electrodes around the holes of the resonators R12 to R14.

In addition, a signal is transmitted to the first input / output electrode P1 by capacitive coupling between the electrode around the hole of the second resonator R12 and the first input / output electrode P1, wherein the hole of the first resonator R11 is It acts as a trap to block the passage of signals of any particular frequency band. Meanwhile, the transmitter filter is input to the third input / output electrode and output to the second input / output electrode. The detailed operation principle is the same as that of the receiver filter.

However, since the conventional duplexer is used only in one frequency band, when the terminal is used in the dual band, a duplexer having a different frequency band should be used. Accordingly, there is a problem that the size of the terminal increases and the manufacturing process increases, thereby increasing the manufacturing cost of the terminal.

The present invention has been made to solve the above problems of the prior art, the object of which is to manufacture a duplexer having a different pass frequency band used in a mobile terminal in one dielectric block to reduce the terminal manufacturing cost and miniaturize the terminal An integrated dual band duplexer is provided.

1 is a perspective view of an integrated duplexer according to the prior art,

2 is a conceptual diagram of an integrated dual band duplexer according to the present invention;

3 is a perspective view of a first embodiment according to the present invention;

4 is a bottom view of the integrated dual band duplexer according to the first embodiment of the present invention;

5 is a perspective view of a second embodiment according to the present invention;

6 is a bottom view of an integrated dual band duplexer according to a second embodiment of the present invention;

7 is a perspective view of a third embodiment according to the present invention;

8 is a bottom view of an integrated dual band duplexer according to a third embodiment of the present invention;

9 is a perspective view of a fourth embodiment according to the present invention;

10 is a bottom view of an integrated dual band duplexer according to a fourth embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

21: first dielectric filter 22: second dielectric filter

23: common antenna 24: first transmission line

25: second transmission line 26: antenna hole

27: separation groove 200: printed circuit board (PCB)

D20: dielectric block

According to a feature of the integrated dual-band duplexer according to the present invention for solving the above problems, the first and the outer surface except for the open surface by applying a conductive material to the first surface to pass different frequency bands; The duplexer is integrally formed so that each open surface faces each other at a predetermined distance from each other, and a duplexer is formed with a concave groove toward the open surface from a short circuit surface located opposite to each open surface so as to distinguish the transmitting and receiving ends of each duplexer. Wealth; A common antenna unit formed at the center of the dielectric block to which the duplexers are connected to each other such that the antenna terminals of the first and second dielectric filters of the duplexer unit are shared with each other; Characterized in that it is formed of a transmission line between the common antenna unit and the first and second duplexer, respectively, an impedance matching unit for matching the impedance of the common antenna unit and the first and second duplexer,

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram of an integrated dual band duplexer according to the present invention, wherein a common antenna 23 for transmitting and receiving signals to and from the first duplexer 21, the second duplexer 22 and the duplexers, and the common antenna 23 are shown in FIG. ) And a first transmission line 24 for matching impedance between the first duplexer 21 and a second transmission line 25 for matching impedance of the common antenna 23 and the second duplexer 22. do.

3 is a perspective view of a first embodiment according to the present invention, in which a first duplexer 21 is formed on one side of the dielectric block D20 and a second duplexer 22 is formed on the other side so that the open surfaces thereof face each other. The first duplexer 21 has input / output electrode portions P11 and P12 for inputting and outputting signals and a plurality of through-holes having the openings as inlets and having outlets at corresponding rear surfaces thereof at regular intervals, and at the same time as the inner surfaces of the holes. A plurality of resonators R11 to R18 having inner conductors formed therein, and the second duplexer 22 also includes an input / output electrode unit and a plurality of resonators R21 to R30. Here, among the plurality of resonators R11 to R18 of the first duplexer 21, the resonators R11 and R18 at both ends of the open surface operate as band stop filters, and the other resonators R12 to R17 are band pass filters. It works. In addition, the resonators R21 and R30 at both ends of the open surface of the second duplexer 22 operate as band stop filters, and the other resonators R22 to R29 operate as band pass filters.

4 is a bottom view of the integrated dual band duplexer according to the first embodiment of the present invention, wherein the first and second duplexers 21 and 22 have the input / output electrode portions P11, P12, P21, and P22 toward the open surface. A common antenna 23 having a center of an open surface connected to each other so as to share antennas of the first and second dielectric filters 21 and 22, and the common antenna 23 and the first and second duplexers. The first and second transmission lines 24 and 25 are formed between the common antenna 23 and the duplexers 21 and 22 to match the impedances of the 21 and 22. The common antenna 23 and the first and second transmission lines 24 and 25 are formed by removing the outer conductor surface of the dielectric block D20.

The surface of the dielectric block D20 on which the common antenna 23 is formed is bonded to the printed circuit board PCB 200 to transmit and receive signals from the integrated dual band duplexer.

The operation of the first embodiment of the integrated dual band duplexer according to the present invention will be described with reference to Figs. 3 and 4, when a signal is input from the common antenna 23, a transmission line for matching impedance according to the frequency band of each signal. Through the first duplexer 21 or the second duplexer 22 is used. Accordingly, when a signal having a suitable band of the first duplexer 21 is input, the impedance of the first duplexer 21 and the common antenna 23 is matched, and the impedance of the second duplexer 22 is infinite, so that the first duplexer 21 is infinity. Only used.

The signal input to the first duplexer 21 is transmitted to R15 by the dielectric pattern between the resonators of the open surface, and the electromagnetic coupling and the resonator holes R15 to R18 formed between the resonators R15 to R17. The signal is transmitted by capacitive coupling between the surrounding electrodes. In addition, a signal is transmitted to the input / output electrode P12 by capacitive coupling between the electrode around the hole of R17 and the input / output electrode P12, wherein the resonance hole of the R18 blocks the passage of a signal of a specific frequency band. Serve as a trap.

The signal input to the input / output electrode P11 of the first duplexer 21 is transmitted by a capacitive coupling between the electromagnetic field coupling formed between the resonators R12 to R14 and the electrodes around the holes of the resonators R11 to R14. . This signal is also transmitted by the common antenna by capacitive coupling between the electrode around the hole of R14 and the common antenna.

FIG. 5 is a perspective view of a second embodiment according to the present invention, and description of elements overlapping with elements of FIG. 3 will be omitted. In the second embodiment shown in FIG. 5, in the first embodiment, the common antenna 23 positioned on the bottom surface of the dielectric block D20 is formed on the opposite side of the bottom surface of the dielectric block D20, and the common antenna 23 is formed. An antenna hole 26 vertically penetrating the dielectric block D20 is formed at the center of the antenna. Since the common antenna 23 is located on the top surface of the dielectric block D20 and is not bonded to the PCB 200, the common antenna 23 may reduce the signal interference effect with the PCB 200.

FIG. 6 is a bottom view of the integrated dual band duplexer according to the second embodiment of the present invention, and description of elements overlapping with the components of FIG. 4 will be omitted. An opposite surface of the common antenna is formed on the bottom of the integrated dual band duplexer shown in FIG. 6, and a dielectric pattern is formed around the antenna hole 26.

The operation of the second embodiment of the integrated dual band duplexer according to the present invention will be described with reference to Figs. 5 and 6, wherein the signals received from the common antenna 23 are first and second transmission lines 24 and 25 according to frequency. Signal is transmitted by the capacitive coupling of the antenna of the common antenna 23 and the antenna hole 26 to the first duplexer 21 or the second duplexer 22 suitable for the band at each frequency. do.

The signal input to the input / output electrode P11 of the first duplexer 21 is transmitted to the common antenna 23 by capacitive coupling of the dielectric pattern of the bottom part and the antenna hole 26. The operation is the same as that of the first embodiment.

7 and 8 are a perspective view and a bottom view of an integrated dual band duplexer according to a third embodiment of the present invention, the description of components overlapping with the first embodiment will be omitted throughout the drawings. In the integrated dual band duplexer of the third embodiment, the first and second duplexers 21 and 22 have a predetermined area between the transmitting end and the receiving end of each filter in a separation groove 27 recessed from one side of the filter to the open surface. Are separated. The separation groove 27 improves the signal interference effect of the transmission and reception of each filter to improve the frequency characteristics.

9 and 10 are a perspective view and a bottom view of an integrated dual band duplexer according to a fourth embodiment of the present invention, the description of components overlapping with the second embodiment will be omitted throughout the drawings. In the fourth embodiment, a separation groove in which the first and second duplexers 21 and 22 of the dual band duplexer of the second embodiment are recessed from one surface of the filter to an open surface concave a predetermined area between the transmitting end and the receiving end of each filter. It is comprised separately by (27).

The operations of the third and fourth embodiments are omitted with reference to the operations of the first and second embodiments.

The integrated dual band duplexer configured as described above may change the dielectric pattern of the open surface or the dielectric pattern of the outer conductor surface of the dielectric block to suppress the interference effect of the signal and improve the characteristics of the signal.

The integrated dual band duplexer of the present invention configured as described above can implement a duplexer having different pass frequency bands as a single dielectric block, thereby reducing the area occupied on the PCB of the terminal and miniaturizing the terminal, as well as printing of the terminal. Since a dual band duplexer can be integrated into a circuit board (PCB) and surface mounted at a time, the manufacturing process can be simplified and the production cost can be lowered accordingly and economical.

Claims (5)

The first and second duplexers for applying a conductive material to the outer surface other than the open surface with one surface as an open surface and passing different frequency bands are integrally formed to face each open surface at a predetermined distance from each other. A duplexer portion in which a recess is formed toward the open surface from a short circuit surface positioned in an opposite direction to each open surface so that a transmitting end and a receiving end of each duplexer are distinguished; A common antenna unit formed at the center of the dielectric block to which the duplexers are connected to each other such that the antenna terminals of the first and second dielectric filters of the duplexer unit are shared with each other; And an impedance matching unit formed between transmission lines between the common antenna unit and the first and second duplexers, respectively, to match impedances of the common antenna unit and the first and second duplexers. The method of claim 1, The common antenna unit is formed within the separation distance of the first and second duplexer and the integrated dual band duplexer, characterized in that located at the same distance from the antenna end of each duplexer. delete The method of claim 1, And the common antenna part and the impedance matching part are formed on the side of the junction where the integrated dual band duplexer is attached to a printed circuit board (PCB). The method of claim 1, The common antenna part and the impedance matching part are formed on the opposite side of the bonding surface to which the integrated dual band duplexer is attached to the printed circuit board (PCB), the integral double including the hole formed through the dielectric block through the common antenna part as an inlet Band duplexer.