KR100729969B1 - Repeater having dielectric band stop resonators - Google Patents

Abstract

A dielectric band stop resonator and a repeater including the same are provided to design a pass band and a duplex filter with high skirt and improved insertion loss characteristics by connecting a number of coaxial dielectric resonators having minimum radiation energy loss and a band stop filter. A repeater includes a transmitter stage and a receiver stage around an antenna. A low noise amplifier amplifies a receiving signal as an RF signal received from the receiver stage suppresses noise included in the RF signal. A filter unit improves skirt characteristics of the RF signal from the low noise amplifier. A drive amplifier amplifies the RF signal from the filter unit. The RF signal is inputted to the transmitter stage and then is radiated to the outside through the antenna. The filter unit is formed by assembling a coaxial dielectric resonator and a band pass filter capacitively or inductively. The coaxial dielectric resonator minimizes radiation energy loss. The band pass filter includes a coupling electrode holder composed of a thin metal film in order to connect an input/output port to the coaxial line. An electrode part is prepared in the coupling electrode holder, and a dielectric filter is prepared in the electrode part, and a coupling electrode is inserted in the dielectric filter and is connected to the input/output port.

Description

Dielectric band stop resonators and repeaters having the same {Repeater having Dielectric Band Stop Resonators}

1 schematically shows a general repeater circuit.

2 is a view showing an advanced repeater circuit according to the Republic of Korea Patent Registration No. 0541068 and Application No. 2006-23055,

3 is a diagram illustrating skirt frequency characteristics (transition portions of steep slope) of steep slopes on both sides of a passband;

4 is a diagram showing characteristics of a band stop filter,

5 is a block diagram of a method of combining a plurality of band stop filters in various cases to obtain characteristics of a band pass filter.

FIG. 6 is a diagram illustrating a simulation result of a band pass filter designed by the method of FIG. 5. FIG.

7 is a band stop filter designed by combining a coaxial dielectric resonator with a minimized radiation energy loss and a high frequency coaxial line according to the present invention for simulation and actual measurement characteristics of the filter.

8 is a diagram of a three-pole band stop filter in which three coaxial dielectric resonators with minimized radiant energy loss are combined with high frequency coaxial lines, and an estimation and actual measurement characteristic of the filter.

9 is a diagram of a five-pole band stop filter and characteristics in which five coaxial dielectric resonators with minimized radiant energy loss in accordance with the present invention are combined in the method of FIG.

FIG. 10 is a band pass filter designed by combining the method of FIG. 5 using two sets of 3-pole band stop filters of FIG. 8 as a new type of filter according to the present invention, and FIG.

FIG. 11 is a band pass filter designed by combining two 5-pole band stop filters of FIG. 9 with high frequency coaxial lines with a novel filter according to the present invention, and characteristics of the filter. FIG.

12 is a diagram of an improved repeater circuit of Korean Patent Registration No. 0541068 and Application No. 2006-23055.

FIG. 13 is a band pass filter designed by combining two 10-pole band stop filters designed to match the repeater characteristics of FIG. 12; FIG.

FIG. 14 is a diagram showing a duplexer filter designed to meet the repeater required characteristics of FIG. 12, the estimated characteristics of the filter, and the characteristics of the receiver measured in practice; FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater having a filter composed of dielectric band stop resonators having improved skirt and isolation characteristics, and in particular, a dielectric band stop resonator for repeaters used in wireless mobile communication devices. The present invention relates to a filter composed of these and high frequency coaxial lines.

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 signal pass band, that is, the in-band characteristic of passing only a signal of a frequency band (passband) without loss and the out-band eliminating the remaining frequency band. All of the characteristics are satisfied.

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

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 to be lowered.

In other words, the PCS network currently requires a skirt characteristic of -45db / 0.625Mhz and an isolation characteristic of -80dB or less.

Meanwhile, 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, After downconverting the frequency to 70MHz, the SAW filter is used. However, the operating frequency of the SAW filter is approximately 70 MHz to 200 MHz, much lower than 900 MHz for GSM or 1700 MHz for PCS. In addition, the repeater has excellent skirt characteristics, but has a disadvantage in that multiple stage amplifiers must be connected due to the characteristics of the SAW filter having an insertion loss of more than -20dB. That is, the cost of the device increases, but since there is no alternative in reality, the above IF configuration is adopted.

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 a cost problem in the field of communication, such as -50 dB / 0.6 MHz or the dielectric filter of 1800 MHz or 2600 MHz or 2000 MHz, 800 MHz, 900 MHz, which is required for radio or satellite broadcasting communication. Improvement of dielectric filter performance to meet -50dB / 0.625MHz segmentation characteristics, to replace IF conversion method that requires circuit consisting of oscillator, filter, mixer and multiple amplifiers with director conversion method Going on.

A repeater having such a dielectric filter will be described with reference to FIG. 1.

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

Here, the down-and-up converter unit DUC1 may include a first RF SAW filter 34 and an oscillation signal and a filter from the local oscillator LO, which primarily improve a skirt characteristic of the RF signal input from the low noise amplifier 31. 34. A first mixer 35 for downmixing the signal passing through 34 to generate an intermediate frequency, a line amplifier 36 for amplifying the signal from the first mixer 35, and an intermediate from this line amplifier 36. A line amplifier 36-amplifying the intermediate frequency signal from the down converter unit 38 and the second RF SAW filter 34-1 including the second RF SAW filter 34-1 for improving the skirt characteristic of the frequency signal. 1) up-mix the oscillation signal from the third RF SAW filter 37, the local oscillator LO and the signal from the third RF SAW filter 37 to improve the skirt frequency characteristics of the amplified frequency signal. Of the second mixer 35-1 generating the RF signal of the RF signal up-mixed by the second mixer 35-1. The re-improving agent properties 4 Further included is an up-converter unit (39) comprising the RF SAW filter (37-1).

By such a configuration, the specific RF signal input to the receiving end Rx of one 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 it 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 is an intermediate frequency (IF). A second down-and-converter (DUC2) which down-converts to improve the skirt characteristic and then up-converts to restore the original RF signal; driving to amplify the RF signal from this down-and-up converter After input to the transmitting terminal (Tx) of the duplexer 30 via an amplifier 42 (drive amp) 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 is, like the converter DUC1 described above, the first RF SAW filter 44, which locally 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 oscillator LO and the signal passing through the filter 44 to generate an intermediate frequency, and a line amplifier 46 for amplifying the signal from the first mixer 45. And the down converter section 48 comprising the second RF SAW filter 44-1 for improving the skirt characteristic of the intermediate frequency signal from the line amplifier 46 and the second RF SAW filter 44-1. A line amplifier 46-1 for amplifying the intermediate frequency signal, a third RF SAW filter 47 for improving skirt frequency characteristics of the amplified frequency signal, an oscillation signal from the local oscillator LO, and a third RF SAW filter ( A second mixer 45-1, which upmixes the signal from 47) to generate an RF signal of its original size; The consists of two mixers 45-1 up-converter portion 49 consisting of the 4 RF SAW filter (47-1) to improve the skirt characteristic of the up mixer from the RF signal.

According to such a configuration according to FIG. 1, 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.

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.

However, in the technique disclosed in the above-mentioned literature and the like, there is a problem that the down-and-up converter of the repeater circuit makes it difficult to miniaturize the repeater itself and does not satisfy the requirements for the selectivity characteristics.

An object of the present invention has been made to solve the above problems, a combination of a coaxial dielectric resonator and a band stop filter made of a high frequency coaxial line with a plurality of radiation energy loss is minimized, showing a good skirt and insertion loss characteristics Designing band and duplexer filters and providing repeaters with these filters.

In order to achieve the above object, a repeater incorporating a high-frequency coaxial line and a coaxial dielectric resonator with minimized radiation energy loss includes a transmitting end and a receiving end around an antenna, and the RF signal received from the receiving end is an RF signal. A low noise amplifier for amplifying a received signal while suppressing noise in the middle, a filter means for improving a skirt characteristic of the RF signal from the low noise amplifier, a drive amplifier for amplifying the RF signal from the filter means, and a high power amplifier input to the transmitting end. The filter means is formed by a combination of a high frequency coaxial line and a band stop filter composed of a coaxial dielectric resonator with minimal radiation energy loss.

The present invention is characterized by a band pass and duplexer filter designed with a combination of high frequency coaxial lines and band stop filters composed of multiple coaxial dielectric resonators with minimal radiation energy loss.

The present invention is characterized by a combination of a band pass, a low pass, and a high pass filter combined with a band pass or duplexer filter composed of a coaxial line for high frequency and a coaxial dielectric resonator having a plurality of radiation energy losses minimized. do. Other types of filters include, for example, SAW or dielectric filters.

In the repeater according to the present invention, a band stop filter combination composed of the plurality of high frequency coaxial lines and a coaxial dielectric filter minimized radiation energy loss, and a filter of another type, that is, a dielectric filter including an SAW or elliptic function dielectric filter. A pass band filter (BPF) is added.

In the repeater according to the present invention, a dielectric filter in which a dielectric band pass filter (BPF) and a band stop filter are combined is added to a combination of the band stop filter of the coaxial dielectric resonator type in which the plurality of radiant energy losses are minimized. It features.

In the repeater according to the present invention, a dielectric band pass filter coupled with a strip line low pass filter is added to a combination of the band stop filter of the coaxial dielectric resonator type having the plurality of radiation energy losses minimized.

 In the repeater according to the present invention, the filter means is provided in the transmitting end and the receiving end, respectively.

The above and other objects and novel features of the present invention will become more apparent from the description of the specification and the accompanying drawings.

First, the concept of the present invention will be described.

The filter at high frequencies is roughly divided into a high pass filter, a low pass filter and a band pass filter.

The bandpass filter passes signals in the frequency bands f1 and f2 and attenuates the signals in the stopband as shown in FIG. 3. Here, the attenuation (skirt) characteristic is -ΔS21 / Δf. Since the selectivity characteristic of the repeater is, for example, -50dB / 1MHz for PCS, and the attenuation characteristic at PCS operating frequency is about -50dB / 20MHz among the dielectric filters currently used, a converter circuit with a SAW filter is used. Done.

The band stop filter attenuates the signals in the frequency bands f1 and f2 as shown in FIG. 4 and passes the other signals with as little loss as possible.

FIG. 5 illustrates a method of designing a desired band pass filter by combining multiple band stop filters, and also has other forms of filter combinations, i.e., SAW or other dielectric filters, other types of characteristics, i.e., pass bands, FIG. 6 is a diagram illustrating a method for obtaining a desired final filter characteristic as shown in FIG. 6 by combining filters of low pass and high pass characteristics.

The present invention combines a SAW or dielectric band pass filter with a combination of a high frequency coaxial line and a coaxial dielectric resonator with a minimum number of radiant energy losses and a coaxial dielectric resonator in both the Rx and Tx stages of the repeater. Simulation and actual experiments confirmed that the attenuation characteristics of the filter combination at the operating frequency, for example, 1700 MHz of the PCS, can be as low as -50 dB / 1 MHz to satisfy the repeater selectivity characteristics. .

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated according to attached drawing.

In addition, in description of this invention, the same code | symbol is attached | subjected to the same part and the repeated description is abbreviate | omitted.

(Example 1)

The band stop filter applied to the present invention is designed using a high frequency coaxial line which is easy to mass-produce, inexpensive, reliable, and has a low loss, and a coaxial dielectric resonator with minimal radiation energy loss.

7 is a diagram showing a 1-pole band stop filter according to the present invention, and simulation and actual measurement characteristic results. To reduce the radiation energy loss of the coaxial dielectric resonator to minimize the insertion loss of the filter, the coaxial dielectric resonator is well wrapped with a thin copper plate-like conductor and combined with high frequency coaxial lines.

That is, FIG. 7 is a view showing the structure and characteristics of the coaxial dielectric band stop filter according to the present invention.

In FIG. 7A, reference numeral 100 denotes an input terminal S21, 200 denotes an output terminal S11, and 300 denotes a coupling electrode holder for connecting a band pass filter and an input / output terminal with a coaxial cable.

An electrode part 400 is provided in the coupling electrode holder 300, and a dielectric filter 500 is embedded in the electrode part 400. In addition, a coupling electrode 600 connected to the input terminal 100 and the output terminal 200 is inserted into the dielectric filter 500. The height of the coupling electrode 600 in the dielectric filter 500 is mounted in accordance with the characteristics of the desired frequency.

That is, as shown in Figure 7, the metal-coated coupling electrode holder 300 and the electrode portion 500 is spaced apart by a predetermined distance, for example, a distance of about 2 mm without affecting the skirt characteristics In addition, the dielectric filter 500 and the electrode unit 500 are also spaced apart by a predetermined distance.

In a preferred embodiment of the present invention, the coupling electrode holder 300 and the electrode portion 500 are manufactured in a substantially rectangular pillar shape, and the dielectric filter 500 has a cylindrical shape in a cylindrical through hole at the center of the electrode portion 400. It is built. The coupling electrode 600 is also mounted at the center of the dielectric filter 500.

FIG. 7B is a graph schematically illustrating the frequency characteristics of the coaxial dielectric band stop filter shown in FIG. 7A, and FIG. 7C is a diagram illustrating a result of measuring S11 and S21 characteristics by coupling the coaxial dielectric band stop filter with a coupling electrode. to be.

8 is a three-pole band stop filter according to the present invention and the estimated and actual measurement characteristics of the filter.

9 is a five-pole band stop filter according to the present invention and its characteristics. Compared with the characteristics of the three-pole filter of FIG. 8, the skirt characteristic of one side is very excellent at -50dB / 1MHz in the 1.7 GHz band of the PCS frequency domain.

FIG. 10 is a combination of two 3-pole band stop filters of FIG. 8 to form a pass band filter, and shows an excellent insertion loss in the frequency band where estimation and actual measurement characteristics are desired.

FIG. 11 illustrates the design of a band pass filter by combining two 5-pole band stop filters of FIG. 9 and shows measurement characteristics of the filter. Within the PCS frequency of use, the new repeater characteristics, which require the skirting characteristics of both transition bands, are sufficiently satisfied and the insertion loss is very good at less than -1dB.

12 is a repeater circuit diagram shown in Korean Patent Registration No. 0541068 and Application No. 2006-23055 which can be designed if the skirt and insertion loss characteristics of two duplexers mounted at the input and output ends of the repeater are sufficiently good.

FIG. 13 illustrates a band pass filter suitable for the repeater of FIG. 12 and the duplexer filter of FIG. 14 by combining a band stop filter made of a combination of a high frequency coaxial line and a plurality of coaxial dielectric resonators with a minimum of radiant energy loss. It is showing.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

As described above, according to the repeater having a filter composed of a high-frequency coaxial line and a coaxial dielectric resonator with minimal radiation energy loss, the desired pass band can be designed by applying two kinds of band stop filters. The effects of repeater insertion loss, ripple, return loss, attenuation (skirt), and isolation are excellent.

In addition, according to the present invention, a repeater having filters composed of a coaxial line for high frequency and a coaxial dielectric resonator with minimized radiation energy loss, the effect that the repeater can be manufactured compact, inexpensive and easily can be obtained.

Claims (7)

A low noise amplifier having a transmitting end and a receiving end around the antenna, the RF signal received from the receiving end amplifying the received signal while suppressing noise in the RF signal, filter means for improving a skirt characteristic of the RF signal from the low noise amplifier; As a repeater which is input to the transmitting end via a drive amplifier and a high power amplifier for amplifying the RF signal from the filter means and radiated to the outside through the antenna, The filter means is formed by a combination of a high frequency coaxial line and a band stop filter in which a coaxial dielectric type resonator minimizing radiation energy loss is coupled in an electric or capacitive field. The plurality of high frequency coaxial lines and band stop filters of the coaxial dielectric type which minimize radiation energy loss are each connected in series or in parallel with each other.  The band stop filter includes a coupling electrode holder made of a thin film metal for connecting an input / output terminal to the coaxial line, And a coupling electrode provided in the coupling electrode holder, a dielectric filter embedded in the electrode portion, and a coupling electrode inserted into the dielectric filter and connected to the input / output terminal. The method of claim 1, A band stop filter consisting of a plurality of high frequency coaxial lines and a coaxial dielectric resonator minimizing a plurality of radiant energy losses is added to another band pass filter (BPF) including a dielectric or SAW filter and the filter combination. Repeater. The method of claim 1, A dielectric band pass filter (BPF) consisting of a coaxial dielectric resonator maximizing a high frequency coaxial line and a plurality of radiant energy losses in a combination of a plurality of high frequency coaxial lines and a band stop filter composed of a coaxial dielectric resonator minimizing a plurality of radiant energy losses. And a coaxial dielectric band stop filter and a combination of these filters. The method of claim 1, And a low pass or high pass filter and a filter combination added to the filter combination consisting of the plurality of high frequency coaxial lines and the coaxial dielectric resonator minimizing a plurality of radiant energy losses. The method of claim 1, And the filter means includes a duplexer filter combination comprising a high frequency coaxial line provided at the transmitting end and the receiving end and a coaxial dielectric resonator minimizing a plurality of radiant energy losses, and a duplexer. Coaxial dielectric resonators with minimal radiation energy loss are made up of a combination of band-stop filters coupled by high frequency coaxial lines,  The band stop filter includes a coupling electrode holder made of a thin film metal for connecting an input / output terminal to the coaxial line, And a coupling electrode inserted into the coupling electrode holder, a dielectric filter embedded in the electrode portion, and a coupling electrode inserted into the dielectric filter and connected to the input / output terminal. Adds a band stop filter in which a plurality of coaxial dielectric resonators are coupled by a high frequency coaxial line to a band pass filter consisting of a combination of band stop filters in which coaxial dielectric resonators minimizing a large number of radiant energy losses are coupled by a high frequency coaxial line,  The band stop filter includes a coupling electrode holder made of a thin film metal for connecting an input / output terminal to the coaxial line, And a coupling electrode provided in the coupling electrode holder, a dielectric filter embedded in the electrode portion, and a coupling electrode inserted into the dielectric filter and connected to the input / output terminal.

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