KR20020056748A - The dielectric duplexer - Google Patents

Abstract

PURPOSE: A dielectric duplexer is provided to facilitate design and manufacture by using non-conductive pattern of a strip line for freely adjusting poles and zeros. CONSTITUTION: A dielectric duplexer comprises a dielectric block(D2), a first to an eighth resonator holes(R21-R28) from the open surface(12) to the rear surface(13) of the dielectric block(D2), a first and a second input/output electrodes(P21,P22), an antenna electrode(Ant2), a load electrode(H21), a strip line conductive pattern(H24) and a non-electrode pattern(S1). The dielectric block(D2) is coated with conductive material except for the open surface(12). The inner surfaces of the resonator holes(R21-R28) are coated with conductive material. The first and the second input/output electrodes(P21,P22) are formed on the open surface(12) and the top surface(11) of the dielectric block(D2) for functioning as signal input and output of a band pass filter. The load electrode(H21) is formed around the resonator holes(R21-R28) on the open surface(12) and is coupled to the inner conductor. The conductive pattern(H24) is formed near the top of the second to the fourth resonator holes(R22-R24). The non-electrode pattern(S1) is formed by removing a receiving stage part of an electrode coupled to the outer conductor.

Description

The dielectric duplexer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric duplexer. In particular, the present invention relates to a dielectric duplexer that is easy to design and manufacture by using a non-conductive pattern in the form of a strip line that can freely adjust the frequency position of the pole forming the passband and the zero forming the stopband. It is about.

In the information age, the use of mobile communication devices using high frequency circuits such as home wireless telephones and PCS mobile communication 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, a band pass filter or a band stop filter for passing or blocking only necessary signals among high frequency signals is currently used, and the most widely used dielectric filter is the front of a wireless device. -It is used for front-end transceiver.

The implementation method of the dielectric filter is divided into an integrated filter and a resonator coupled filter. In the integrated filter, a resonator hole is formed in a dielectric block formed of one block, and a coupling pattern for coupling an input / output electrode and a coupling is formed. At this time, an inter-digital capacitance exists between the coupling patterns. By adjusting the capacitance, the coupling value between the resonators 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 pattern to display a predetermined capacitance value on the board (board) to control the coupling between the resonators.

1 is a dielectric duplexer according to the prior art, the dielectric block (D1) and the outer surface is formed by applying a conductive material to the entire outside including one side of the open surface (2) and one side edge of the open surface (2), and First to eighth resonator holes 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 2 of the dielectric block D1 to the corresponding other rear surface 3. First and second R14, R15, R16, R17, and R18, and the first and second portions formed across the open surface 2 and the upper surface 1 of the dielectric block D1 to perform a function of signal input and output to the band pass filter. It consists of two input-output electrodes and antenna electrodes P11, P12, and Ant1.

At this time, one end of the resonator holes R11 to R18 becomes a short end connected to the ground at the rear surface 3 of the dielectric block, and the second to fourth resonators R12, R13 and R14 and the fifth to seventh resonators ( R15, R16, and R17 operate as band pass filters of the receiving end and the transmitting end Rx1 and Tx1, and the first and eighth resonators R11 and R18 operate as band stop filters that form an attenuation pole.

In the receiving terminal Rx1, the first input / output electrode P11 is operated as an input port of a band pass filter, and in the transmitting terminal Tx1, the second input / output electrode P12 is operated as an output port and the antenna electrode Ant1. Is shared by the output port of the receiver and the input port of the transmitter.

The first and second input and output electrodes P11 and P12 are shared between the band stop filter and the adjacent resonator hole, and the first and second input and output electrodes and the antenna electrodes P11 and P12 and Ant1 are divided into the dielectric block D1. It is separated from the outer conductor by an exposed isolation pattern of.

The open surface 2 is connected to the inner conductor to form a load electrode H11 around the resonator holes R11 to R18, and a band connected to the outer conductor around the outermost side of the open surface 2. An electrode pattern H12 having a shape is formed, and is connected to the external conductor between the fifth to seventh resonator holes R15 to R17 and the load electrode H11 connected to form the band pass filter of the transmitting end Rx1. A bar-shaped electrode H13 is formed.

Electromagnetic coupling occurs between the load electrodes H11 formed on the open surface 2, and the strength of the coupling and the position of the transmission zero are adjusted by the distance and the area between the load electrodes H11.

In this case, when the electrode H13 having a bar shape connected to the external conductor passes between the load electrodes H11, the transmission agent appears at a position higher than the pass band. When only the load electrode H11 is formed, the transmission agent is the pass band. Will appear below.

In addition, a capacitive coupling is formed between the load electrode H11 and the band-shaped electrode pattern H12 to adjust the resonant frequency and bandwidth of each resonator hole, and the first and second input / output electrodes and the antenna electrode ( P11, P12, and Ant1 are electromagnetically coupled to the load capacitance of the neighboring resonator holes to form input / output capacitance.

The resonator holes R12 to R14 are formed to be spaced apart from the load electrode H11 at upper portions of the second to fourth resonator holes R12 to R14 forming the band pass filter of the receiving end Rx1. The conductive pattern H14 in the form of a strip line is formed in the direction shown.

The conductive pattern H14 in the form of a strip line determines the reception region Rx1 filtering region frequency band by adjusting a coupling capacitance between neighboring resonator holes and a cross coupling capacitance between non-adjacent resonator holes.

However, in the conventional dielectric filter, the actual strip line-shaped conductive pattern increases the load capacitance of each resonator hole to reduce the resonance frequency, so that the coupling between the resonator holes and the resonance frequency are adjusted instead of the cross coupling between non-neighbor resonator holes. It will play a role.

Therefore, the presence of a strip line-shaped conductive electrode causes the poles of each resonator hole to converge with each other, and the transmission zero is closer to each pole, making it easier to design and in the case of the receiver filter, the attenuation value in the transmitter band increases. Forming a conductive electrode of the type has a problem in that the pattern is complicated and the space in which it can be formed is limited.

The present invention has been made to solve the above problems of the prior art, the object of which is to use a non-conductive pattern in the form of a strip line that can freely adjust the frequency position of the pole forming the passband and the zero forming the stopband. The present invention relates to a dielectric duplexer that is easy to design and manufacture.

1 is a perspective view showing the configuration of a dielectric duplexer according to the prior art,

2 is a perspective view showing the structure of a dielectric duplexer according to the present invention;

3 is a graph illustrating a comparison of the filter characteristics of a receiver of a dielectric duplexer without a non-electrode pattern and a dielectric duplexer with a non-electrode pattern;

4 is a perspective view showing a second embodiment of the dielectric duplexer according to the present invention;

5 is a perspective view showing a third embodiment of the dielectric duplexer according to the present invention;

6 is a perspective view showing a fourth embodiment of the dielectric duplexer according to the present invention;

<Explanation of symbols on main parts of the drawings>

D2: dielectric block Rx2: receiving end

Tx2: Transmitter H21: Load electrode

H22: Strip-shaped electrode pattern H23: Bar-shaped electrode

H24: conductive pattern S1: non-electrode pattern

11: upper surface 12: open surface

13: rear P21, P22, Ant2: input / output electrode

R21 to R28: first to eighth resonator holes

According to a feature of the dielectric duplexer according to the present invention for solving the above problems, in the dielectric duplexer composed of a transmitting end and a receiving end to perform the transmission and reception of signals at the same time, one side as an open surface and one side edge of the open surface A dielectric block acting as a ground by applying a conductor to an outer front surface including a plurality of through-holes having an opening on the open side of the dielectric block and having an outlet at a corresponding rear side thereof is formed at regular intervals and at the same time. A plurality of resonators having internal conductors formed on the surface thereof, an input / output electrode portion formed over an open surface of the dielectric block and an upper surface adjacent to the open surface to perform signal input and output functions, and connected to the internal conductors An open surface and a neighborhood between the load electrode formed around the resonator hole in the direction and the resonator hole of the transmitting end Is a ground strip line connecting a top surface and a corresponding bottom surface to form a capacitive coupling with the load electrode, and an electrode is removed in a traveling direction in which a resonator hole is formed in an outer conductor serving as a ground between the resonator holes of the receiving end. It comprises a non-electrode pattern.

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

The dielectric duplexer is composed of a receiver and a transmitter filter, and plays an important role in separating the transmission signal and the reception signal in the mobile communication terminal. The dielectric duplexer needs to have a very large attenuation value in the transmitter band in the characteristics of the receiver filter.

2 is a dielectric block (D2) in which the outer surface is formed by applying a conductive material to the entire outer surface including one edge of the open surface 12 and the outer surface of the dielectric duplexer according to the present invention; First to eighth resonator holes R21, R22, and R23 having an inner conductor formed by applying a conductive material to an inner surface of the hole penetrating from the one open surface 12 of the dielectric block D2 to the corresponding other rear surface 13. And R24, R25, R26, R27, and R28, which are formed over the open surface 12 and the upper surface 11 of the dielectric block D2 to perform signal input and output functions to the band pass filter. It consists of 2nd input-output electrodes and antenna electrodes P21, P22, and Ant2.

At this time, one end of the resonator holes R21 to R28 is a short end connected to the ground at the rear surface 13 of the dielectric block, and the second to fourth resonators R22 to R24 and the fifth to seventh resonators R25 to R25 of the dielectric block. R27 is a bandpass filter of the receiving end and the transmitting end Rx2 and Tx2, and the first and eighth resonators R21 and R28 are operated as band stop filters forming an attenuation pole.

In the receiving terminal Rx2, the first input / output electrode P21 is operated as an input port of a band pass filter, and in the transmitting terminal Tx2, the second input / output electrode P22 is operated as an output port and the antenna electrode Ant2. Is shared by the output port of the receiving end Rx2 and the input port of the transmitting end Tx2.

The first and second input / output electrodes P21 and P22 are shared between the band stop filter and the adjacent resonator hole, and the first and second input / output electrodes and the antenna electrodes P21 and P22 are exposed to the dielectric block D2. It is separated from the outer conductor by an isolated isolation pattern.

The open surface 12 is connected to the inner conductor to form a load electrode H21 around the resonator holes R21 to R28, and a band connected to the outer conductor around the outermost side of the open surface 12. An electrode pattern H12 having a shape is formed, and is connected to the external conductor between the fifth to seventh resonator holes R25 to R27 and the load electrode H21 connected to form the band pass filter of the transmission terminal Tx2. The bar electrode H23 is formed.

Electromagnetic coupling occurs between the load electrodes H11 formed on the open surface 12, and the strength of the coupling and the position of the transmission zero are adjusted by the distance and the area between the load electrodes H21.

Here, when the electrode H23 of the bar shape connected to the external conductor passes between the load electrodes H21, the transmission agent appears at a position higher than the pass band. When only the load electrode H23 is formed, the transmission agent is the pass band. Will appear below.

In addition, a capacitive coupling is formed between the load electrode H21 and the band-shaped electrode pattern H22 to adjust the resonant frequency and bandwidth of each resonator hole, and the first and second input / output electrodes and the antenna electrode ( P21, P22 and Ant2 are electromagnetically coupled to the load capacitance of the neighboring resonator holes to form the input / output capacitance.

On the upper side of the second to fourth resonator holes R22 to R24 forming the band pass filter of the receiving terminal Rx2, the resonator holes R22 to R24 are formed to be spaced apart from the load electrode H21 by a predetermined distance. The conductive pattern H24 in the form of a strip line is formed.

The stripe-shaped conductive pattern H24 determines the receiving end Rx2 filtering region frequency band by adjusting a coupling capacitance between neighboring resonator holes and a cross coupling capacitance between non-adjacent resonator holes.

An electrode connected to an external conductor on the open surface 12 of the dielectric block D2 is disposed at a predetermined distance from the coupled pattern of each resonator hole, and in the receiving end Rx2 region, the electrode is removed in the form of a strip line. The non-electrode pattern S1 is formed to play the same role as the conductive pattern H24 in the form of the strip line.

FIG. 3 is a graph illustrating the receiver filter characteristics of the dielectric duplexer without the non-electrode pattern and the dielectric duplexer with the non-electrode pattern. In this region, the position of the transmission zero in the transmitter band is increased without changing the pass band of the receiver. It can be seen that the sharpness of the filter is increased.

4 is a second embodiment of the dielectric duplexer according to the present invention, in which one surface is an open surface 22 and a dielectric material is formed by applying a conductive material to the entire outside including one edge of the open surface 22 to form an outer conductor. First to eighth resonator holes in which an inner conductor is formed by applying a conductive material to the inner surface of the block D3 and the hole penetrating from the one side open surface 22 of the dielectric block D3 to the corresponding other rear surface 23. (R31, R32, R33, R34, R35, R36, R37, R38) and the opening 22 and the upper surface 21 of the dielectric block (D3) is formed over the function of the signal input and output to the band pass filter It consists of the first and second input and output electrodes, antenna electrodes (P31 and P32, Ant3) to perform the.

The open surface 22 is connected to the inner conductor to form a load electrode H31 around the resonator holes R31 to R38, and a band connected to the outer conductor around the outermost side of the open surface 22. An electrode pattern H32 having a shape is formed, and is connected to the external conductor between the fifth to seventh resonator holes R35 to R37 and the load electrode H31 connected to form the band pass filter of the transmission terminal Tx3. The bar electrode H33 is formed.

The resonator hole R32 is spaced apart from the resonator holes R32 to R34 at a rear surface 23 of the receiving terminal Rx3 side of the dielectric block D3 in which the second to fourth resonator holes R32 to R34 are short-circuited. The non-electrode pattern S2 in which the electrode is removed in the form of a strip line is positioned in the direction in which ~ R34 is formed.

The non-electrode pattern S2 may be present on the upper side, the lower side, or both sides of the resonator holes R32 to R34, and the width, length, and number of the non-electrode patterns S2 satisfy a characteristic of the duplexer. Is determined within.

FIG. 5 is a third embodiment of a dielectric duplexer according to the present invention, wherein a non-electrode pattern S3 is formed on an upper surface 31 formed by connecting the input / output electrode portions P41, P42, and Ant4 of the dielectric duplexer to an open surface 32. ) Is formed.

The non-electrode pattern S3 should be formed to be spaced apart from the open surface 32 of the dielectric block by a predetermined distance, and the distance between the non-electrode pattern S3 and the open surface 32 and the width, length and number of the non-electrode pattern. Is determined within a range satisfying the characteristics of the duplexer.

6 shows a fourth embodiment of the dielectric duplexer according to the present invention, in which the non-electrode pattern S4 of the dielectric duplexer corresponds to the upper surface 41 on which the input / output electrode portions P41, P42, and Ant4 are formed. It is formed at 44.

A dielectric block D4 having one surface as an open surface 42 and a conductive material applied to the entire outside including one edge of the open surface 42 to form an outer conductor, and one open surface of the dielectric block D4 The first to eighth resonator holes R41, R42, R43, R44, R45, R46, R47, and R48 having conductive materials applied to the inner surfaces of the holes penetrating from the 42 to the corresponding other rear surfaces 43. And first and second input / output electrodes and antenna electrodes P41 and formed on the open surface 42 and the upper surface 41 of the dielectric block D4 to perform a function of signal input and output to the band pass filter. P42, Ant4).

The non-electrode pattern S4 formed on the lower surface 44 of the dielectric block D4 should be formed to be spaced apart from the open surface 42 of the dielectric block D4 by a predetermined distance, and the non-electrode pattern S4 and the open surface ( The separation distance 42 and the width, length, and number of the non-electrode patterns are determined within a range satisfying the characteristics of the duplexer.

In the dielectric duplexer of the present invention configured as described above, in realizing the characteristics of the receiver filter, the filter is formed by freely adjusting the position of the pole forming the receiver passband and the transmission channel appearing thereunder using a non-electrode pattern in the form of a strip line. Not only is easy to design and manufacture, but also has an effect of improving attenuation characteristics in a transmission band.

Claims (6)

In the dielectric duplexer composed of a transmitter and a receiver to simultaneously transmit and receive a signal, A dielectric block having one surface as an open surface and a conductor applied to an outer entire surface including one edge of the open surface to serve as a ground; A plurality of resonators in which an opening surface of the dielectric block is an inlet and a plurality of through holes having an outlet at a corresponding rear surface thereof are formed at regular intervals and an inner conductor is formed on an inner surface of each hole; An input / output electrode unit formed over an open surface of the dielectric block and an upper surface adjacent to the open surface to perform signal input and output functions; A load electrode connected to the inner conductor and formed around a resonator hole of an open surface; A ground strip line connecting the open surface between the resonator holes of the transmitting end and an adjacent upper surface and a lower surface corresponding thereto to form a capacitive coupling with the load electrode; And a non-electrode pattern in which electrodes are removed in a traveling direction in which a resonator hole is formed in an outer conductor serving as a ground between the resonator holes of the receiving end. The method of claim 1, The non-electrode pattern is a dielectric duplexer, characterized in that formed by varying the width, length, number of patterns in accordance with the characteristics of the receiver filter. The method of claim 1, The non-electrode pattern is a dielectric duplexer characterized in that the electrode is removed in the form of a strip line spaced apart from the resonator hole in a direction in which the resonator holes are arranged on the receiving end side open surface of the dielectric block. The method of claim 1, The non-electrode pattern is a dielectric duplexer, characterized in that the electrode is removed in the form of a strip line spaced apart from the resonator hole in the direction in which the resonator holes are arranged on the back side of the dielectric block. The method of claim 1, The non-electrode pattern is a dielectric duplexer characterized in that the electrode is removed in the form of a strip line spaced apart from the open surface on the upper surface of the receiving end side of the dielectric block. The method of claim 1, The non-electrode pattern is a dielectric duplexer characterized in that the electrode is removed in the form of a strip line spaced apart from the open surface on the lower surface of the receiving end side of the dielectric block.