KR100541068B1 - Repeater having dielectric filter - Google Patents

Abstract

The present invention provides a repeater with a dielectric filter. The present invention also provides a repeater having a duplexer dielectric filter.

The dielectric filter is formed by forming an input / output end resonator and a plurality of intermediate resonators on an integral dielectric, and applying at least one bandstop filter (BSF) to one side of the dielectric, and the bandstop filter (BSF), A first conductive stripline 1 having a predetermined width and a predetermined length, and at least one second conductive stripline 2, 2-1, .. having a predetermined width and a predetermined length. 1,2) are placed at right angles to each other at predetermined intervals.

The duplexer dielectric filter DDF bandstops at least one of a receiving electrode RE of the receiving end Rx dielectric filter DF or a transmitting electrode TE of the transmitting end Tx dielectric filter DF. And a band stop filter BSF comprising a first conductive stripline 1 having a predetermined width and a predetermined length, and at least one second conductive stripline having a predetermined width and a predetermined length 2; 2-1, ..), and the conductive strip lines 1, 2 are positioned at right angles to each other in a state spaced apart at predetermined intervals.

Bandstop Filter, Dielectric Filter, Microstrip Filter

Description

Repeater having dielectric filter

1 is a perspective view showing a dielectric filter manufactured according to the elliptic function filter theory;

2A and 2B are graphs schematically showing frequency characteristics of the dielectric filter of FIG. 1;

3 is a perspective view illustrating a dielectric filter having a microstrip bandstop filter according to an embodiment of the present invention;

Figure 4 is a view showing a bandstop filter of an embodiment provided in the dielectric filter according to the present invention,

5 is a view showing a bandstop filter of another embodiment;

6 is a graph showing a comparison of frequency characteristics of the bandstop filter of the other embodiment shown in FIGS. 4 and 5;

7 is a graph schematically showing the frequency characteristics of the dielectric filter shown in FIG.

8 is a perspective view showing a dielectric filter having a microstrip bandstop filter according to another embodiment of the present invention;

9 is a graph schematically showing the frequency characteristics of the dielectric filter shown in FIG. 8;

10 is a perspective view showing a duplexer dielectric filter according to the present invention having a microstrip bandstop filter;

FIG. 11 is a graph schematically showing the frequency characteristics of the duplexer dielectric filter shown in FIG. 10;

12 is a perspective view showing a duplexer dielectric filter of another embodiment according to the present invention;

FIG. 13 is a graph schematically showing the frequency characteristics of the duplexer dielectric filter shown in FIG. 12;

14 is a view schematically showing a general repeater,

15 is a schematic structural diagram of an intermediary having a dielectric filter in accordance with an embodiment of the present invention;

16 is a schematic diagram of an intermediary having a duplexer dielectric filter according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

# 1 ~ # 6: I / O stage resonator or intermediate resonator AE: Antenna electrode

CE: Coupling Electrode GE: Common Electrode

IE: Input electrode OE: Output electrode

LPF: Low Pass Filter BSF: Band Stop Filter

10,20: first and second elliptic function filter

The present invention provides a dielectric filter having improved skirt and isolation characteristics or a duplexer including the dielectric filter, thereby providing a direct conversion without a circuit configuration for IF frequency conversion. The present invention relates to a repeater having a dielectric filter that can be configured by a direct conversion method.

The role of a filter in a communication device is to select a signal of a desired frequency band, and the most ideal filter is a filter that passes only a signal of the desired frequency band without loss and removes all remaining signals. Therefore, the most important characteristics of the filter are the in-band characteristic of passing only a signal of a signal pass band, that is, a frequency band (pass band) without loss, and an out band eliminating the remaining frequency band. ) All of the characteristics are satisfied.

Filters used in duplexers and repeaters of portable communication devices are generally two or more dielectric resonators, for example, a coaxial resonator or a re-entrant resonator that resonates at a specific frequency. Create by combining The dielectric filter mainly determines the bandwidth, insertion loss, skirt and spurious frequency responses of the filter by the number of resonators and the coupling method of the filter. .

However, due to the limitation of the bandwidth in the frequency allocated for portable communication, there is a need to rapidly attenuate frequency components other than the passband frequency. In other words, while filtering, the skirt representing the electrical characteristics of the filter is required to be steep, while the isolation is required (currently, for example, a skirt of -45db / 0.625Mhz in a PCS network). Characteristics and isolating characteristics of -80dB or less).

On the other hand, in order to satisfy the skirt characteristics and selectivity characteristics of such a repeater, an IF conversion scheme is currently used, and accordingly, using a local oscillator and a mixer, for example, a 1800 MHz band After downconverting the frequency to 70MHz, the SAW filter is used. However, this repeater has a disadvantage that the amplifier of several stages should be connected due to the characteristics of the SAW filter having excellent skirting characteristics, but having an insertion loss of more than -20dB. That is, the cost of the device is increased, but since there is no alternative in practice (cost-effectively), the above IF scheme is employed.

In the 3rd, 4th generation, and satellite DMB communication systems, the IF conversion method is expected to be used to ensure the selectivity from the adjacent channel. Accordingly, the problem of cost is not solved. It is expected to remain.

In order to solve the cost problem of the communication field, the present inventors have proposed a method for solving the cost problem in the field of communication. Improving the performance of dielectric filters to meet the -50dB / 0.625MHz segmentation characteristics, we are looking to replace the IF-conversion method with a director conversion method that requires a circuit consisting of an oscillator, filter, mixer, and multiple amplifiers. I'm going.

On the other hand, the existing dielectric filter has a three-pole filter formed by combining an intermediate (coupling) resonator coupled between an input stage resonator and an output stage resonator in a column or row form. Further, in order to obtain a steep skirt characteristic in one or both frequency bands from the dielectric filter configured as described above, a band stop resonator (BSR) is coupled to one or both sides of the input stage resonator or the output stage resonator. Thereby, a steep skirt characteristic can be obtained in either side of a passband. As described above, the cut-off frequency characteristic in the stopband band of the in-band characteristics is further combined with one band stop resonator to each of the input stage resonator and the output stage resonator. Accordingly, there is a disadvantage that the insertion loss is increased by combining a plurality of resonators.

In order to solve this problem, the applicant of the patent application No. 10-2001-0002523 "dielectric filter and duplexer dielectric filter", by combining the input stage resonator and the output stage resonator and attaching the odd or even number of resonators to the above or both sides In addition to the steep skirt frequency characteristics, the proposed method can reduce the insertion loss. At this time, the elliptic function filter theory is applied. To apply the elliptic function filter theory, first, the resonator array is arranged so that the input single resonator and the output single resonator can be coupled to each other. It must be correct and also find a suitable binding method for combining them. In addition, another requirement is that the elliptic coupling between the input stage resonator and the output stage resonator must be negative coupling. This could be satisfied by combining the three resonators in a triangle.

Then, let's briefly look at the conventional technology filed and disclosed by the applicant of the present invention.

1 is a perspective view showing a dielectric filter manufactured according to the elliptic function filter theory. As illustrated in FIG. 1, a dielectric having a triangle shape is formed, and a resonance hole H is formed near a vertex of the dielectric, and three resonance holes H are formed to have a predetermined interval in a triangle shape. Coupling electrodes CE are coated on the upper surface of each of the resonance holes H to be patterned for coupling the resonance period, and all areas except the patterned part are coated and patterned by the common electrode GE. In this case, the coupling electrode CE, the inner wall of the resonance hole H, and the common electrode GE are integrally connected. Functionally, the input stage resonator (# 1), the intermediate resonator (# 2), the output stage resonator (# 3), the intermediate resonator (# 2) between the input stage resonator (# 1) and output stage resonator (# 3) It is coupled to one side.

Meanwhile, an input terminal electrode IE and an output terminal electrode OE through which signals are input and output are formed adjacent to the coupling electrode CE. In this case, the input end electrode IE and the output end electrode OE are complementary in function, and thus the input end electrode IE may perform the function of the output end electrode OE, and is linked to the output end electrode OE. ) Serves as the input terminal electrode IE. Accordingly, the region where the coupling electrode CE adjacent to the input terminal electrode IE through which the signal is input serves as the input terminal resonator # 1, and the coupling electrode CE adjacent to the output terminal electrode OE is formed. The area serves as the output stage resonator (# 3). Like the input end electrode IE and the output end electrode OE, the input end resonator # 1 and the output end resonator # 3 have a complementary function, and the input end electrode IE and the output end electrode OE have a signal. By performing any one function in the input / output relationship of the input stage resonator (# 1) and the output stage resonator (# 3) to perform a complementary function.

Meanwhile, coupling electrodes CE are formed in the resonator regions as described above, and the coupling electrodes CE are spaced apart from each other and patterned. At this time, the input stage resonator # 1 and the output stage resonator # 3 may be negatively coupled according to the elliptic function filter theory, that is, the input stage resonator may be weakly coupled as compared with the coupling between other resonators. The opposing distance between the coupling electrode CE formed in the region of # 1) and the output stage resonator # 3 is increased or the mutually opposing area is reduced.

2A and 2B are graphs schematically showing frequency characteristics of an input terminal or an output terminal of the dielectric filter of FIG. 1. As shown in Figures 2a and 2b, the frequency characteristics of the three-pole filter shown in Figure 1 has an insertion loss compared to the frequency characteristics of the filter coupled to the band stop resonator (BSR) in the existing column or row form At the same time, a steep skirt frequency characteristic (A) is exhibited at one side of the transition bands on both sides of the passband. On the other hand, the steep skirt frequency characteristic (A) of the high or low transition frequency band formed on the left and right sides of the passband can be adjusted by tuning the resonator shown in FIG.

On the other hand, in order to obtain steep cutoff frequency characteristics in both stopbands of the passband, it is necessary to increase the number of resonators of the elliptic function filter by at least four.

However, this results in the disadvantage that the length of the dielectric filter becomes longer and the insertion loss increases. In addition, as the length increases, there is a limit to the compact design design.

On the other hand, together with the integrated dielectric filter proposed by the applicant, the frequency can be reduced by using the oscillator and the mixer, and then the SAW filter can be used to improve the skirt characteristics, but also, as the oscillator, the mixer and the SAW filter Since the circuit configuration must be inserted, there is a problem that the insertion loss increases.

This problem occurs in the same manner when manufacturing a duplexer dielectric filter in which the dielectric filter configured as described above is coupled to both sides of the antenna electrode.

On the other hand, the present applicant as a way to improve the characteristics of the dielectric filter, in the patent application No. 10-2003-0074714 describes a technique for applying a microstrip filter on one side of the dielectric filter in which a plurality of resonators are integrally formed in the dielectric It is starting.

Accordingly, the present invention is based on the applicant's patent application as described above, and has been made to improve the technology, and as described above, in a dielectric filter in which a plurality of resonators are integrally manufactured according to the elliptic function filter theory. By applying a microstrip bandstop filter to one side of a dielectric filter having an input stage or an output stage resonator, the skirt frequency characteristic of the stopband band (out) is improved while improving the passband characteristics (in-band characteristics) using the plurality of resonators. An object of the present invention is to provide a dielectric filter having a microstrip bandstop filter capable of improving band characteristics).

In addition, another object of the present invention is to manufacture a plurality of resonators on the dielectric according to the elliptic function filter theory, by providing an input and / or output stage resonator on one side and a microstrip bandstop filter on the other side, An object of the present invention is to provide a duplexer dielectric filter having a microstrip bandstop filter which is capable of improving the skirt frequency characteristic of the stopband band while improving the passband characteristic.

In addition, according to the present invention, by providing the dielectric filter as described above, an IF conversion unit including an oscillator, a filter, a mixer, and a plurality of amplifiers, which are conventionally provided for the IF conversion, may be replaced with the dielectric filter. It is an object of the present invention to provide a repeater having a dielectric filter in which frequency conversion is performed by direct conversion without conversion.

In addition, according to the present invention, since the duplexer dielectric filter is provided as described above, an IF conversion unit including an oscillator, a filter, a mixer, and a plurality of amplifiers, which are conventionally provided for the IF conversion, can be replaced with the duplexer dielectric filter. It is an object of the present invention to provide a repeater with a duplexer dielectric filter which is capable of frequency conversion by direct conversion without an IF conversion.

The present invention for achieving the above object of the present invention comprises two duplexers having a transmitting end (Tx) and a receiving end (Rx) around the antenna (ANT), and receives from the receiving end (Rx) of the one duplexer A low noise amplifier for amplifying a received signal while suppressing noise in the RF signal, a dielectric filter DF1 for improving skirt characteristics of the RF signal from the low noise amplifier, and amplifying the RF signal from the dielectric filter DF1 After input to the transmission terminal (Tx) of the other duplexer via a drive amplifier (drive amp) and a high power amplifier (rad), and radiated to the outside through the antenna (ANT),

A low noise amplifier for amplifying the received signal while the RF signal received from the receiving end Rx of the other duplexer suppresses noise in the RF signal, and a dielectric filter DF2 for improving the skirt characteristic of the RF signal from the low noise amplifier, After input to the transmission terminal (Tx) of the other duplexer via a drive amplifier and a high power amplifier for amplifying the RF signal from the dielectric filter (DF2), and then to the outside through the antenna (ANT) In a repeater configured to be radiated,

The dielectric filter DF is formed by forming an input / output end resonator and a plurality of intermediate resonators on an integrated dielectric, and apply at least one bandstop filter (BSF) to one side of the dielectric, and apply the bandstop filter ( BSF) is composed of a first conductive stripline having a predetermined width and a predetermined length, and at least one second conductive stripline having a predetermined width and a predetermined length, and the conductive striplines are orthogonal to each other at a predetermined interval. It provides a repeater having a dielectric filter, characterized in that by positioning.

In addition, the present invention includes two duplexers (DDF1, DDF2) having a transmitting end (Tx) dielectric filter (DF) and a receiving end (Rx) dielectric filter (DF) around the antenna ANT, and the one duplexer ( A low noise amplifier for amplifying the received signal while suppressing noise in the RF signal by the RF signal received from the receiver Rx dielectric filter DF of the DDF1, a drive amplifier for amplifying the RF signal from the low noise amplifier, and After input to the Tx dielectric filter DF of the other duplexer via a high power amplifier, it is radiated to the outside through the antenna ANT and receives the receiving end of the other duplexer DDF2. Rx) a low noise amplifier for amplifying a received signal while the RF signal received from the dielectric filter DF suppresses noise in the RF signal, a drive amplifier for amplifying the RF signal from the low noise amplifier, and a high power amplifier (high) power power In using a repeater configured to be emitted through the antenna (ANT) and then inputted to the transmitting end (Tx) dielectric filter (DF) and the other duplexer to the outside,

The duplexer dielectric filter DDF bandstops at least one of a receiving electrode RE of the receiving end Rx dielectric filter DF or a transmitting electrode TE of the transmitting end Tx dielectric filter DF. And a bandstop filter (BSF), the first conductive stripline having a predetermined width and a predetermined length and at least one second conductive stripline having a predetermined width and a predetermined length. Provided is a repeater having a duplexer dielectric filter, characterized in that the conductive strip line is positioned at right angles to each other at a predetermined interval.

(Example)

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

3 is a perspective view schematically showing an integrated dielectric filter according to a first embodiment of the present invention.

The integrated dielectric filter proposed in the first embodiment includes a first elliptic filter 10 and a second elliptic filter 20. That is, by combining two dielectric filters of FIG. 1, each of the first elliptic function filter 10 and the second elliptic function filter 20 forms a dielectric body integrally to form a substantially rectangular body. Resonance holes (H) are formed in the integrally formed dielectric, and three resonance holes (H) are formed in a lateral direction with a predetermined interval in a triangle form according to the elliptic function filter theory. The coupling electrode CE is patterned on the upper surface of each of the resonance hole H regions for coupling the resonance period, and all sides of the dielectric except the patterned portion are coated with the common electrode GE. Then, the first elliptic function filter 10 and the second elliptic function filter 20 are combined to manufacture one-piece. Meanwhile, an input stage resonator # 1, an intermediate resonator # 2, and an intermediate resonator # 3 are formed in the first elliptic function filter 10, and an intermediate resonator # is formed in the second elliptic function filter 20. 4), the intermediate resonator # 5 and the output stage resonator # 6 are formed. Meanwhile, between the input stage resonator # 1 and the intermediate resonator # 3, and between the resonator # 4 and the output stage resonator # 6, negative elliptic coupling, -k (1,3),-k ( 4,6). On the other hand, the input and output stage resonators # 1 and # 6 are complementary.

As a result, a dielectric filter (band pass filter) including the first elliptic function filter 10 and the second elliptic function filter 20 is formed.

Here, the input and output stage resonators and the intermediate resonators (# 1 ~ # 6) of the dielectric filter is not limited to being arranged in accordance with the elliptic function filter theory, the number can be variously selected, the diameter of the resonator hole and the The thickness ratio and the distance between adjacent resonance periods can also be varied. In addition, it is not only composed of a coaxial resonator, it is possible to replace at least one resonator with a variety of resonators including elliptical, concave and step-type resonator as needed.

On the other hand, the input end electrode IE or the output end electrode OE adjacent to the coupling electrode CE of the input stage resonator # 1 and the output stage resonator # 6 through which the signal is input and output is a microstrip bandstop filter according to the present invention. (BSF: band stop filter).

Such a microstrip bandstop filter is composed of a stripline bandstop filter disclosed in pages 452 to 462 of the technical document "MICROWAVE ENGINEERING: PASSIVE CIRCUIT" of PETER A, RIZZ.

4 to 6, the microstrip bandstop filter (BSF) included in the dielectric filter of the present invention has a predetermined width w ₀ having one end as an input terminal and the other end as an output terminal. consists of a straight of the first conductive strip line (1) and a predetermined width (w ₁₎ and a second conductive strip line (2) of the straight line having a predetermined length (l ₁₎ of predetermined length (l _0), the two The strip lines 1 and 2 have shapes that are orthogonal to each other in a state spaced apart at a predetermined interval d (see FIG. 4).

The second conductive stripline 2 may be provided in plural, for example, the 2-1 conductive stripline 2-1, the 2-2 conductive stripline 2-2, and the like. The strip lines 2-1, 2-2,... Maintain the predetermined distance d from the first strip line 1 like the second conductive strip line 2, and the adjacent strip lines 2-1,. 2-2, ..) so as to maintain a quarter-wavelength spacing λ _r / 4 of the resonant frequency signal (see FIG. 5). In the drawings, the conductive strip lines 2, 2-1, and 2-2 are shown to be spaced apart at 1/4 wavelength intervals in parallel with each other, but are not limited thereto.

The microstrip bandstop filter may have a large number of strip lines 2, and may adjust and tune the variables w ₀ , l ₀ , w ₁ , l ₁ , d, and λ _r / 4 accordingly. have. Also, in the plurality of second conductive striplines 2, the variables w ₁ , l ₁ , d may be changed differently for each stripline 2, 2-1, 2-2,.

6 shows a microstrip bandstop filter (BSF) composed of a first stripline (1) and a second stripline (2), a first stripline, a second strip, and the like. A graph showing the stopband characteristics near the resonance frequency f _r of the microstrip bandstop filter (BSF) composed of the 2-1st strip lines (2,2-1), respectively, by a dotted line and a dashed line, respectively. When the first, second, and second-first conductive strip lines 1, 2, and 2-1 are composed of the line 1 and the second strip line 2, the stopband characteristics of the steep slope are reduced. You can see what it represents. On the other hand, it can be seen that the slope of the stopband characteristic becomes steeper as the number of second strip lines is increased through this graph.

In the dielectric filter according to the embodiment of FIG. 3, the microstrip bandstop filter (BSF) described with reference to FIGS. 4 to 6 may have an input stage resonator (# 1) and an output stage on one side of the dielectric filter in which the band pass filter is formed. It can be seen that it is applied adjacent to the resonator # 6. 3 shows a microstrip bandstop filter (BSF) composed of a first stripline 1 and second and second-first striplines 2 and 2-1, but the stripline 2 is shown in FIG. Of course, a plurality may be provided as necessary.

FIG. 7 is a graph illustrating the characteristics of the dielectric filter according to the embodiment of FIG. 3 having the microstrip bandstop filter as described above. FIG. 7 is an ellipsis in which the microstrip bandstop filter (BSF) is not provided. The characteristics of the functional bandpass filter are shown, the characteristics of the microstrip bandstop filter are indicated by a dashed line, and the characteristics of the elliptic-function dielectric filter of the present invention with the microstrip bandstop filter (BSF) are shown by the solid lines.

According to the drawings, in the dielectric filter having the microstrip bandstop filter according to the present invention (see the frequency band characteristic of the solid line), the band composed of the elliptic function filters 10 and 20 provided on one side of the dielectric filter. According to the pass filter, good passband characteristics are shown (reference numeral ①), and both edges of the passband (according to the characteristics of the two microstrip bandstop filters provided on the other side of the dielectric filter (front side in FIG. 3)). It can be seen that the band-stop characteristic (ref. 2) of steep slope is shown in the transition band).

FIG. 8 is a view showing a dielectric filter having a microstrip bandstop filter (BSF) according to a second embodiment of the present invention. Other configurations are the same as those of the first embodiment, and only one end of an input terminal or an output terminal is illustrated. It consists of a bandstop filter (BSF) according to the present invention.

The other stage is composed of a microstrip filter (low pass filter: LPF) of the shape shown in the applicant's patent application No. 10-2003-0074714. That is, the microstrip filter (low pass filter) may include, for example, a 3-set low pass filter in which an input impedance of 50 Ω is output as an output impedance of 50 Ω through a three-step CLC filter, or, for example, an input impedance of 50 Ω may be performed in five steps. It consists of a 5-set low pass filter which is output with 50Ω output impedance through CLCLC filter. If necessary, the low pass filter may be configured with a plurality of settings.

Meanwhile, in FIG. 8, the band stop filter BSF includes three second conductive strip lines 2, 2-1, and 2-2, and the low pass filter LPF is composed of five sets. Of course, the number of the conductive stripline and the set can be varied.

9 is a graph showing the characteristics of the dielectric filter according to the present invention having the configuration as described above, the elliptic function band pass filter is not provided with a microstrip bandstop filter (BSF) as a dotted line as shown in the graph In accordance with the present invention, the characteristics of the microstrip bandstop filter (BSF) are indicated by a dashed-dotted line, and the microstrip bandstop filter (BSF) and the 5-set low pass filter (LPF) are provided by solid lines. Frequency band characteristics of the dielectric filter are shown.

According to the drawings, in the dielectric filter having the microstrip bandstop filter according to the present invention (see the frequency band characteristic of the solid line), the band composed of the elliptic function filters 10 and 20 provided on one side of the dielectric filter. According to the pass filter, it shows good band pass characteristics (reference ① '), and one edge of a specific band according to the filter characteristics of one microstrip bandstop filter (BSF) provided at an input terminal or an output terminal at one side of the dielectric filter. Shows the bandstop characteristics (ref. ② ') of steep slopes as compared with the prior art, and not only suppresses the higher-order mode harmonics including the second harmonics in the outband characteristics by the low pass filter (LPF), but also the spurious frequency. It can be seen that the characteristics can be improved (③ ').

A duplexer dielectric filter having a microstrip bandstop filter according to the present invention will be described with reference to FIG. In the description of the duplexer dielectric filter, since the two dielectric filters described in the present invention are formed by combining the dielectric filter 200, the receiving dielectric filter 200 is referred to the reference numeral of the transmitting dielectric filter 100. They are to be distinguished from each other in the form of), and these reference signs shall be indicated only when necessary.

As shown in FIG. 10, the integrated duplexer dielectric filter of the present invention is formed by integrally coupling the dielectric filter shown in FIG. 3 to both sides of the antenna electrode AE. That is, the transmitting side dielectric filter 100 is formed at one side around the antenna electrode AE, and the receiving side dielectric filter 200 is formed at the other side. That is, the transmitter dielectric filter 100 and the receiver dielectric filter 200 are combined to each other. Each of the transmitter dielectric filter 100 and the receiver dielectric filter 200 is formed in a substantially rectangular shape. The first and second transmission functions of the first elliptic function filter 10 and the transmission / reception side in which the resonance holes H are formed in the dielectric, and the three resonance holes H are formed in the lateral direction at regular intervals in the form of triangles. It consists of two elliptic function filters 20. The coupling electrode CE is patterned on the upper surface of each of the resonance hole H regions for coupling the resonance period, and all regions except the patterned portion are coated with the common electrode GE. In this case, the coupling electrode CE, the inner wall of the resonance hole H, and the common electrode GE are integrally connected. Meanwhile, an input stage resonator (# 6), an intermediate resonator (# 5), and an intermediate resonator (# 4) are formed in the first elliptic function filter (10), and the intermediate resonator (#) is formed in the second elliptic function filter (20). 3) The intermediate resonator # 2 and the output stage resonator # 1 are formed. On the other hand, between the input stage resonator (# 6) and the intermediate resonator (# 4), between the intermediate resonator (# 3) and the output stage resonator (# 1) negative negative coupling, -k (6, 4), -k (3,1) is achieved. On the other hand, the input and output stage resonators # 1, # 6; # 1 ', # 6' are complementary.

Here, the transmitting end electrode TE and the coupling electrode CE of the resonator # 6 'which are formed on the other side of the dielectric filter and are adjacent to the coupling electrode CE of the resonator # 6 through which signals are inputted and outputted. The receiving end electrode RE adjacent to the N is composed of the microstrip band stop filter (BSF). In addition, the antenna electrode AE adjacent to the coupling electrode CE of the resonators # 1 and # 1 'through which signals are input and output is configured as the 3-set low pass filter or 5-set low pass filter.

Meanwhile, any one of the transmitting end electrode TE and the receiving end electrode RE may be configured as a 3-set or 5-set low pass filter.

Here, the number of resonators # 1 to # 6 constituting the band pass filter of the dielectric filter may also be variously selected as described in the embodiment of FIG. 3, and the diameter ratio of the resonance hole to the thickness of the resonator and adjacent resonance The distance of the period can also be adjusted in various ways. In addition, it is not only composed of a coaxial resonator, it is possible to replace at least one resonator with a variety of resonators including elliptical, concave and step-type resonator as needed.

FIG. 11 is a graph illustrating the characteristics of the duplexer dielectric filter having the configuration as described above. FIG. 7 illustrates the characteristics of the duplexer without the microstrip bandstop filter (BSF) as a dotted line as shown in the graph of FIG. 7. Of the dielectric filter according to the present invention, which shows the characteristics of the microstrip bandstop filter (BSF) by a dashed-dotted line, and the microstrip bandstop filter (BSF) by the solid line and the 5-pass low pass filter (LPF). The characteristics are shown.

According to the drawings, in the duplexer having a microstrip bandstop filter according to the present invention, a good passband according to the bandpass filter composed of the elliptic function filters 10 and 20 provided on one side of the integrated duplexer dielectric filter is provided. Both edges of a specific band according to the frequency band characteristics of the microstrip bandstop filter (BSF) provided at the input or output at the other side (front side of FIG. 10) of the dielectric filter. Shows a bandstop characteristic (ref. 2) of steep slope as compared with the prior art, and not only suppresses the higher-order mode harmonics including the second harmonic in the outband characteristics by the low pass filter (LPF), but also the spurious frequency. It can be seen that the characteristics can be improved (③ ").

12 shows an integrated duplexer dielectric filter in accordance with another embodiment of the present invention. The duplexer dielectric filter according to the present embodiment is also formed by integrally coupling the dielectric filter shown in FIG. 3 to both sides of the antenna electrode AE. That is, the transmitting side dielectric filter 100 is formed at one side around the antenna electrode AE, and the receiving side dielectric filter 200 is formed at the other side. That is, the transmitter dielectric filter 100 and the receiver dielectric filter 200 are combined to each other. Each of the transmitter dielectric filter 100 and the receiver dielectric filter 200 is formed in a substantially rectangular shape. The first and second transmission functions of the first elliptic function filter 10 and the transmission / reception side in which the resonance holes H are formed in the dielectric, and the three resonance holes H are formed in the lateral direction at regular intervals in the form of triangles. It consists of two elliptic function filters 20. The coupling electrode CE is patterned on the upper surface of each of the resonance hole H regions for coupling the resonance period, and all regions except the patterned portion are coated with the common electrode GE. In this case, the coupling electrode CE, the inner wall of the resonance hole H, and the common electrode GE are integrally connected. Meanwhile, an input stage resonator (# 6), an intermediate resonator (# 5), and an intermediate resonator (# 4) are formed in the first elliptic function filter (10), and the intermediate resonator (#) is formed in the second elliptic function filter (20). 3) The intermediate resonator # 2 and the output stage resonator # 1 are formed. On the other hand, between the input stage resonator (# 6) and the intermediate resonator (# 4), between the intermediate resonator (# 3) and the output stage resonator (# 1) negative negative coupling, -k (6, 4), -k (3,1) is achieved.

Here, the transmitting end electrode TE adjacent to the coupling electrode CE of the resonator # 6 and the receiving end electrode RE adjacent to the coupling electrode CE of the resonator # 6 'are formed in the microstrip band. It consists of a stop filter (BSF).

In addition, the antenna electrode AE adjacent to the coupling electrode CE of the resonators # 1 and # 1 'through which signals are input and output is also constituted by a microstrip bandstop filter.

However, in the band stop filter BSF provided in the antenna electrode AE, a first conductive strip line having a predetermined width w ₀ and a predetermined length l ₀ having one end as an input terminal and the other end as an output terminal is provided. (1), at least one second conductive stripline 2 having a predetermined width w ₁ and a predetermined length l ₁ , and at least one having a predetermined width w ₂ and a predetermined length l ₂ . And a third conductive stripline 3, wherein the second conductive stripline 2 and the third conductive stripline 2 are spaced apart from each side of the first conductive stripline 1 by a predetermined distance d. It has a shape positioned so as to be orthogonal to the first conductive stripline 1 in the spaced apart state.

In FIG. 12, the second conductive stripline 2 and the third conductive stripline 3 are shown to be asymmetrical about the first conductive stripline 1.

The second conductive stripline 2 and the third conductive stripline 3 are plural, for example, the second-first conductive stripline 2-1 and the second-second conductive stripline 2-2. And 3-1 conductive stripline, 3-2 conductive stripline, etc., and these striplines 2-1, 2-2, 3-1, 3-2,. .) Maintains a predetermined distance d from the first stripline 1 as with the second and third conductive striplines, and the adjacent striplines 2-1,2-2, ..; 3-1,3 -2, ..) so as to maintain a quarter-wavelength spacing (λ _r / 4) of the resonant frequency signal.

According to such a configuration, the band stop filter BSF provided in the antenna electrode AE can obtain the effect of constituting two band stop filters shown in the basic form in FIG. 4 or 5. Accordingly, the duplexer dielectric filter of the embodiment of FIG. 12 has a form in which two dielectric filters illustrated in FIG.

Meanwhile, the microstrip bandstop filter may have a plurality of second and third conductive strip lines 2 and 3, and accordingly, the variables w ₀ , l ₀ , w ₁ , l ₁ , w ₂ , You can tune by adjusting l ₂ , d and λ _r / 4. Also, in the plurality of second and third conductive striplines 2 and 3, the variables w ₁ , l ₁ , d and w ₂ , l ₂ , d are the striplines ₂ , 2-1, 2-2, ..; 3,3-1,3-2, ..) can be changed differently.

Here, the resonators # 1 to # 6 constituting the band pass filter of the dielectric filter may also be variously selected as described in the embodiment of FIG. 3 without being limited to an elliptic function filter theory. The ratio of the diameter of the resonance hole to the thickness of the resonator and the distance between adjacent resonance periods can also be variously adjusted. In addition, it is not only composed of a coaxial resonator, it is possible to replace at least one resonator with a variety of resonators including elliptical, concave and step-type resonator as needed.

FIG. 13 is a graph illustrating the characteristics of the duplexer dielectric filter having the configuration as described above. The characteristics of the duplexer are not provided with the microstrip bandstop filter (BSF) in a dotted line as shown in the graph of FIG. 7. In the present invention, the microstrip bandstop filter (BSF) is indicated by a dashed-dotted line, and the microstrip bandstop filter (BSF) is provided at the input / output end electrodes RE and TE and the antenna electrode AE by solid lines. The characteristics of the dielectric filter are shown.

According to the drawings, in the duplexer having a microstrip bandstop filter according to the present invention, good passband characteristics can be obtained in accordance with the bandpass filter composed of the elliptic function filters 10 and 20 provided on one side of the integrated duplexer. ('1' '), and the steeper slope than the conventional one at both edges of a specific band according to the frequency band characteristics of the microstrip bandstop filter (BSF) provided at the input terminal or output terminal electrode on the other side of the duplex dielectric filter. It can be seen that the bandstop characteristic (reference symbol ② ") is shown, and that the spacing between two adjacent pad bands is widened by the band pass filter BPF provided in the antenna electrode AE (③ " ') [ That is, the skirt characteristic between two adjacent pad bands is improved.

Meanwhile, in the above embodiment of the present invention, only the case of the dielectric filter is presented as an embodiment, but each of the separately manufactured resonators can be combined to achieve the object of the present invention. For example, a resonant resonator may be used to configure a dielectric filter and a microstrip dielectric filter, and a combination of a coaxial resonator and a resonant resonator may be used. In addition, the coupling strength may be adjusted through the shape deformation of each resonator, the distance interval adjustment, the diameter of the resonance hole, and the like. In addition, at least one microstrip filter may be applied to improve in-band frequency characteristics as well as out-band frequency characteristics.

Hereinafter, a repeater having a dielectric filter as described above and a repeater having a duplexer dielectric filter will be described. First, in order to facilitate the description, in the following drawings, the above-described dielectric filters 100 and 200 according to the present invention are denoted by reference numeral DF (dielectric filter), and the duplexer dielectric filter according to the present invention is denoted by reference numeral DDF (duplexer). dielectric filter).

14 is a view schematically showing a general repeater circuit. A general repeater receives two duplexers 30 and 40 having a transmitting end Tx and a receiving end Rx provided on both sides of the antenna ANT and a receiving end Rx of one of the duplexers 30. The low noise amplifier 31 and the low noise amplifier 31 which amplify the received signal while suppressing the noise in the old signal are converted to the intermediate frequency IF by downconverting to improve the skirt characteristic, and then upconverted to the original RF. Down and up converter (DUC1) for restoring the signal, a drive amplifier (32) for amplifying the RF signal from the down and up converter, and a high power amplifier (33). It is configured to include.

Here, the down-and-up converter unit DUC1 includes a first RF SAW filter 34 which primarily improves a skirt characteristic of the RF signal input from the low noise amplifier 31, an oscillation signal from the local oscillator LO, and the A first mixer 35 for downmixing the signal passing through the filter 34 to generate an intermediate frequency, a line amplifier 36 for amplifying the signal from the first mixer 35, and the line amplifier 36 A down converter section 38 made up of a second RF SAW filter 34-1 for improving the skirt characteristic of the intermediate frequency signal; A line amplifier 36-1 for amplifying the intermediate frequency signal from the second RF SAW filter 34-1, a third RF SAW filter 37 for improving a skirt frequency characteristic of the amplified frequency signal, and the local oscillator A second mixer 35-1 which upmixes the oscillation signal from LO and the signal from the third RF SAW filter 37 to generate an RF signal of an original size, and the second mixer 35-1. And an up-converter portion 39 made up of a fourth RF SAW filter 37-1 which further improves the skirt characteristics of the upmixed RF signal.

By such a configuration, the specific RF signal input to the receiving terminal Rx of the duplexer 30 passes through the low noise amplifier 31 and the down-and-up converter DUC1, and the skirt characteristic is improved, and the driving amplifier ( 32), and is restored to the original RF signal size via the high power amplifier 33, input to the transmitting terminal Tx of the other duplexer 40, and radiated to the outside through the antenna ANT.

On the other hand, the RF signal received from the receiving end (Rx) of the duplexer 40 is a low noise amplifier 41 for amplifying the received signal while suppressing noise in the signal and the RF signal from the low noise amplifier 41 to the intermediate frequency (IF). A second down and up converter (DUC2) which downconverts to improve the skirt characteristic and then converts it back to the original RF signal, and amplifies the RF signal from the down and up converter. After being input to the transmitting terminal Tx of the duplexer 30 via a drive amplifier 42 and a high power amplifier 43, it is radiated to the outside through the antenna ANT.

Here, the second down-and-up converter unit DUC2, like the converter DUC1 described above, has a first RF SAW filter 44 that primarily improves the skirt characteristic of the frequency signal from the low noise amplifier 41; A first mixer 45 for downmixing the oscillation signal from the local oscillator LO and the signal passing through the filter 44 to generate an intermediate frequency, and a line for amplifying the signal from the first mixer 45 A down converter section 48 composed of an amplifier 46 and a second RF SAW filter 44-1 for improving the skirt characteristic of the intermediate frequency signal from the line amplifier 46; A line amplifier 46-1 for amplifying the intermediate frequency signal from the second RF SAW filter 44-1, a third RF SAW filter 47 for improving a skirt frequency characteristic of the amplified frequency signal, and the local oscillator A second mixer 45-1 which upmixes the oscillation signal from LO and the signal from the third RF SAW filter 47 to generate an RF signal of an original size, and the second mixer 45-1. Is composed of an up-converter section 49 composed of a fourth RF SAW filter 47-1 for improving the skirt characteristic of the upmixed RF signal.

According to such a configuration according to FIG. 14, the repeater includes two duplexers each having a transmitting end and a receiving end, and is configured by connecting one receiving end Rx to the transmitting end Tx of the other duplexer, respectively. It can be seen that the connection circuits are configured symmetrically with each other.

15 shows a state in which the dielectric filter according to the present invention replaces the down and up converters DUC1 and DUC2. That is, the repeater with the dielectric filter according to the present invention receives two duplexers 30 and 40 provided with a transmitting end Tx and a receiving end Rx, and a receiving end Rx of one of the duplexers 30. A low noise amplifier 31 for amplifying a received signal while suppressing noise in the old signal, a dielectric filter DF1 for improving the skirt characteristic of the RF signal from the low noise amplifier 31, and an RF signal from the dielectric filter DF1 And a high power amplifier (33) and a high power amplifier (33).

Here, since the dielectric filter DF1 uses the dielectric filter according to the present invention described with reference to FIGS. 3 to 9, the description thereof will be omitted. As shown in the graphs of FIGS. 6, 7, and 9, the dielectric filter DF1 has a skirt frequency characteristic of steep slope (a transition portion of steep slope) at both sides of the passband, and thus, the repeater according to the present invention. In the present invention, down-converting the RF signal to an intermediate frequency using conventional down-and-up converters DUC1 and DUC2, and improving the skirt characteristics of both sides of the pad band using the SAW filter (generating a steep slope transition), Up-converting again to recover the RF signal, and thus the circuit configuration can be omitted.

Therefore, the specific RF signal inputted to the receiving end Rx of the one duplexer 30 passes through the low noise amplifier 31, the dielectric filter DF1, the driving amplifier 32, and the high power amplifier 33. After input to the transmitting end (Tx) of the side duplexer 40 is radiated to the outside through the antenna (ANT).

On the other hand, the RF signal received from the receiving end Rx of the other duplexer 40 is the low noise amplifier 41 which amplifies the received signal while suppressing noise in the signal and the skirt of the RF signal from the low noise amplifier 41. The duplexer 30 via a dielectric filter DF2 for improving characteristics, a drive amplifier 42 for amplifying an RF signal from the dielectric filter DF2, and a high power amplifier 43. After being input to the transmitting terminal (Tx) of the radiated to the outside through the antenna (ANT).

Here, the dielectric filter DF2 has a steep slope skirt frequency characteristic (a steep transition portion) as shown in the graphs of FIGS. 6, 7 and 9, similar to the dielectric filter DF1. In the repeater according to the present invention, downconverting the RF signal to an intermediate frequency by using the conventional down-and-up converters DUC1 and DUC2, and improving the skirt characteristics of both sides of the pad band by using the SAW filter. (Generation of the steepness of the transition portion), the operation of up-converting again to recover the RF signal, and the circuit configuration accordingly can be omitted.

16 shows a state in which the duplexer dielectric filter according to the present invention replaces the duplexers 30 and 40. That is, the repeater including the duplexer dielectric filter (DDF) according to the present invention includes two duplexer dielectric filters (DDF1 and DDF2) described with reference to FIGS. 10 to 13, and one of the duplexer dielectric filters (DDF1). A low noise amplifier 31 for amplifying a received signal while suppressing noise in an RF signal received from a receiving end Rx of the dielectric filter DF, and a driving amplifier 32 for amplifying an RF signal from the low noise amplifier 31; drive amp) and a high power amplifier (33).

The RF signal passing through the high power amplifier 33 is transmitted to the transmit end Tx dielectric filter DF of the other duplexer dielectric filter DDF2 and radiated to the outside through the antenna ANT.

In addition, the RF signal received from the receiving end Rx dielectric filter DF of the other duplexer dielectric filter DDF2 includes a low noise amplifier 41 for amplifying a received signal while suppressing noise in the RF signal. 31 is transmitted to the transmitting end Tx dielectric filter DF of the one duplexer dielectric filter DDF1 via the driving amplifier 42 and the high power amplifier 43 for amplifying the RF signal output from the antenna ANT. Through the outside.

Here, the duplexer dielectric filter DDF is a filter using the dielectric filter DF according to the present invention described with reference to FIGS. 3 to 9 as a receiving end Rx and a transmitting end Tx, respectively. As shown in the graphs of Figs. 6, 7 and 9, both sides of the passband have a steep slope skirt characteristic (a steep transition portion).

Therefore, in the repeater according to the present invention, the skirt characteristic is improved by the receiving end Rx dielectric filter DF of the one duplexer dielectric filter DDF1, and again via the circuits 31, 32 and 33. Since the skirt characteristic of the other duplexer dielectric filter DDF2 is improved by the transmit end Tx dielectric filter DF and then radiated to the outside, the RF signal using conventional down-and-up converters DUC1 and DUC2 is used. Downconverts to an intermediate frequency, improves the skirt characteristics of both sides of the pad band by using the SAW filter (generates a transition portion of steep slope), and restores the RF signal by upconverting again, thereby eliminating a circuit configuration. To be able.

In addition, after the skirt characteristic is improved by the dielectric filter DF constituting the receiving end Rx dielectric filter DF of the other duplexer dielectric filter DDF2, the circuit 41, 42, 43 In addition, since the skirt characteristic is improved by the transmitting end Tx dielectric filter DF of the other duplexer dielectric filter DDF1 and then radiated to the outside, the conventional down-and-up converters DUC1 and DUC2 are used. Downconvert the RF signal to an intermediate frequency, improve the skirt characteristics on both sides of the pad band using SAW filters (create a transition with steep slope), and upconvert again to recover the RF signal, and the circuit configuration accordingly. Can be omitted.

As described above, according to the present invention, by applying a microstrip bandstop filter to one side of a dielectric filter having an input stage or an output stage resonator, the passband characteristics (in-band characteristics) are improved by using the plurality of resonators. There is an effect of providing a dielectric filter having a microstrip bandstop filter which can improve the skirt frequency characteristic (outband characteristic) of the stopband band.

In addition, a plurality of resonators are manufactured on the dielectric according to the elliptic function filter theory, and the input and / or output stage resonators are provided on one side and a microstrip bandstop filter is applied on the other side, thereby improving the passband characteristics and stopping. There is an effect of providing a microstrip bandstop filter to improve the skirt frequency characteristics of the band band.

In addition, it is possible to replace the IF conversion unit consisting of an oscillator, a filter, a mixer, and a plurality of amplifiers provided for the conventional IF conversion with the dielectric filter, so that the frequency conversion is performed by the direct conversion method without the IF conversion. There is an effect of providing a repeater with an integrated dielectric filter.

In addition, an IF conversion unit including an oscillator, a filter, a mixer, and a plurality of amplifiers, which are conventionally provided for an IF conversion, can be replaced by the duplexer dielectric filter, and frequency conversion is performed by a direct conversion method without an IF conversion. It is effective to provide a duplexer dielectric filter.

Claims (11)

Two duplexers (30, 40) provided with a transmitting end (Tx) and a receiving end (Rx) around the antenna (ANT), An RF signal received from the receiving end Rx of the one duplexer 30 improves the skirt characteristics of the RF signal from the low noise amplifier 31 and the low noise amplifier 31 which amplifies the received signal while suppressing noise in the RF signal. The transmitting end of the other duplexer 40 via a dielectric filter DF1, a drive amplifier 32 that amplifies the RF signal from the dielectric filter DF1, and a high power amplifier 33. Tx) and then radiated to the outside through the antenna ANT, The RF signal received from the receiving end Rx of the other duplexer 40 suppresses noise in the RF signal and a skirt characteristic of the RF signal from the low noise amplifier 41 and amplifies the received signal. Transmitting end of one duplexer 30 via an improved dielectric filter DF2, a drive amplifier 42 for amplifying the RF signal from the dielectric filter DF2, and a high power amplifier 43 In the repeater configured to be radiated to the outside through the antenna ANT after being input to (Tx), The dielectric filter DF, The input / output end resonator and the plurality of intermediate resonators are formed on an integral dielectric, and one side of the dielectric includes at least one bandstop filter (BSF), The bandstop filter BSF may include a first conductive stripline 1 having a predetermined width and a predetermined length and at least one second conductive stripline having a predetermined width and a predetermined length 2, 2-1,. And the conductive strip lines (1, 2) are positioned at right angles to each other in a state spaced apart at predetermined intervals. The method of claim 1, And the input and output stage resonators and the plurality of intermediate resonators are arranged in accordance with the theory of elliptic function filters. The method of claim 1, The plurality of second conductive strip lines (2,2-1,2-2, ..) are separated from each other by a quarter wavelength interval (λ _r / 4) of the resonant frequency signal. Repeater. The method of claim 1, The dielectric filter (DF) is a repeater having a dielectric filter, characterized in that one side is configured as a band stop filter (BSF), the other side is configured as a low pass filter. The method of claim 4, wherein And the low pass filter comprises a low pass filter having a plurality of settings. delete Two duplexers (DDF1, DDF2) provided with a transmitting end (Tx) dielectric filter (DF) and a receiving end (Rx) dielectric filter (DF) around the antenna ANT, An RF signal received from the receiving end Rx dielectric filter DF of the one duplexer DDF1 suppresses noise in the RF signal and amplifies a received signal, and an RF signal from the low noise amplifier 31. After input to a drive amplifier (32) for amplifying a (32), and a high power amplifier (33: high power amp) to the transmit end (Tx) dielectric filter (DF) of the other duplexer (DDF2), the antenna (ANT) Is radiated outward through A low noise amplifier 41 for amplifying a received signal while suppressing noise in the RF signal by the RF signal received from the receiving end Rx dielectric filter DF of the other duplexer DDF2, and the RF from the low noise amplifier 41. The antenna ANT is inputted through a drive amplifier 42 for amplifying a signal and a high frequency amplifier 43, and is inputted to the transmitting terminal Tx dielectric filter DF of one duplexer DDF1. In a repeater configured to radiate to the outside through The dielectric filter DF, At least one of the receiving electrode RE of the receiving end Rx dielectric filter DF or the transmitting electrode TE of the transmitting end Tx dielectric filter DF is configured as a bandstop filter BSF, The bandstop filter (BSF) comprises a first conductive stripline (1) having a predetermined width and a predetermined length and at least one second conductive stripline (2, 2-1, ..) having a predetermined width and a predetermined length. And a duplexer dielectric filter, characterized in that the conductive strip lines (1,2) are positioned at right angles to each other in a state spaced apart at predetermined intervals. The method of claim 7, wherein And a plurality of resonators formed in the transmitter and receiver dielectric filters are arranged in accordance with the theory of elliptic function filters. The method of claim 7, wherein the dielectric filter further comprises an antenna electrode (AE), The transmitting electrode TE and the receiving electrode RE are formed of a bandstop filter BSF, and the antenna electrode AE is composed of a low pass filter composed of a plurality of settings. With repeater. The method of claim 7, wherein the dielectric filter further comprises an antenna electrode (AE), The transmitting side electrode TE and the receiving side electrode RE have a first conductive stripline 1 having a predetermined width w ₀ and a predetermined length l ₀ , a predetermined width w ₁ , and a predetermined length l _1. At least one second conductive strip line (2, 2-1, ..), having a band band orthogonal to each other with the conductive strip lines (1, 2) spaced at a predetermined interval (d) Filter (BSF), The antenna electrode AE includes a first conductive stripline having a predetermined width, a predetermined length, and at least one second conductive stripline 2 having a predetermined width and a predetermined length having one end as an input terminal and the other end as an output terminal. And at least one third conductive stripline 3 having a predetermined width and a predetermined length, wherein the second conductive stripline 2 and the third conductive stripline 3 are formed of the first conductive stripline 1. And a bandstop filter (BSF) positioned so as to be orthogonal to the first conductive stripline (1) in a state spaced apart from both sides of a side by a predetermined distance (d). The method of claim 10, The plurality of second conductive strip lines 2, 2-1, 2-2,... And the plurality of third conductive strip lines 2, 2-1, 2-2 are each one quarter of the resonance frequency signal. A repeater having a duplexer dielectric filter, characterized in that separated by a wavelength interval (λ _r / 4).

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