KR19990058995A - High-Q Bandpass Filter for CD-A Base Station with Window Coupling Structure of Dielectric Resonance Period - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

High-Q Bandpass Filter for CDRM Base Station with Left Coupling Structure of Dielectric Resonance Period

2. The technical problem to be solved by the invention

The present invention provides a high-Q having a window with a dielectric resonance period capable of maximally suppressing unwanted wave generation occurring in a dielectric filter by using a window coupling method in order to significantly reduce mechanical size while improving electrical performance. (Q) The purpose is to provide a bandpass filter.

3. Summary of Solution to Invention

The present invention has a plurality of cavities therein, a metal housing having input and output connectors on both sides; A dielectric resonator mounted in each cavity of the housing; A plurality of partitions partitioning each cavity of the housing and having a window for adjusting an amount of coupling coefficient of the electromagnetic wave; and electromagnetic waves connected to input and output connectors in the cavity of the housing and input and output to pass only a desired bandwidth. Inducing coupling loop.

4. Significant Uses of the Invention

This is used for a filter that only passes band signals in the 1.25MHz frequency band.

Description

High-Q Bandpass Filter for Base Station with Window Coupling Structure of Dielectric Resonance Period

The present invention relates to a high-Q bandpass filter used in a CDMA base station for personal communication services (PCS) and a base station for digital cellular systems (DCS). It relates to a high-Q (Q) bandpass filter for a CDMA base station having a dielectric coupling period-coupling window coupling structure that allows only a band signal to pass through with small loss and other signals cannot pass through with high attenuation.

In general, the CDMA bandpass filter is a channel filter used in a CDMA wireless mobile communication base station, and its bandwidth is an essential component used in various ways such as 1.25 MHz, 5 MHz, and 10 MHz, which are channel bandwidths of the CDRM method.

Currently, a combiner used in a domestic radio calling base station is a device for transmitting a plurality of transmission channels by combining them into one antenna stage. An isolator, a dummy load, a cavity filter, It is composed of a junction and an RF cable, and its performance depends largely on the arrangement of the components.

In addition, in the conventional analog system, a combiner using a coaxial cavity filter technique has been used. However, since the channel occupied bandwidth for combining transmission channels is only a narrow bandwidth of 25 kHz, the components of the combiner are used. The in filter could only be used if it passed only narrowband frequencies (up to 25kHz). However, in the CDMA digital system, since the channel occupied bandwidth is 1.23MHz, 5MHz, and 10MHz, the component filter is also a component, and the bandpass filter with bandwidths of 1.23MHz, 5MHz, and 10MHz is used to make the configuration possible. there was.

The conventional channel filter developed and used for CDMA is configured by adjusting the coupling amount of the dielectric resonance period only by the distance between dielectrics. Accordingly, the overall size of the filter is very large, and there is a problem in that the suppression of the unnecessary mode signal generated basically is impossible in the dielectric filter structure.

Therefore, the present invention was devised to solve the above problems, and in order to significantly reduce the mechanical size while improving the electrical performance of the conventional CDMA channel filter, a window coupling method is used in the dielectric filter. It is an object of the present invention to provide a high-Q bandpass filter having a window of a dielectric resonance period capable of suppressing generation of fundamentally undesired waves.

In addition, the present invention has a channel bandwidth of 1.25MHz, 5MHz, 10MHz to significantly reduce the size of the base station to reduce the size, high-quality digital mobile phone service, personal mobile communication service and wireless subscriber network (WLL) Another purpose is to provide a high-Q bandpass filter that can provide good radio wave quality to service.

1 is a perspective view showing an embodiment configuration of a high-Q bandpass filter according to the present invention.

Figure 2 is a perspective view showing a window configuration inside the housing according to the present invention.

3 is a front sectional view of FIG.

* Explanation of symbols for main parts of the drawings

1 housing 2 coupling loop

3: dielectric resonator 4: tuning plate

5: support 6: fixing screw

7: cover 8, 9: input / output connector

10: partition 10a: window

In order to achieve the above object, the present invention is a metal housing having a plurality of equally spaced intervals therein, and provided with input and output connectors on both sides, a dielectric resonator mounted in each cavity of the housing, Each cavity is partitioned, and a plurality of partitions formed with windows for adjusting the amount of coupling coefficients of electromagnetic waves, and inducing electromagnetic waves connected to an input / output cutter in the cavity of the housing and input and output to pass only a desired bandwidth. A high-Q bandpass filter comprising a coupling loop is provided.

The high-Q bandpass filter according to the present invention is implemented to pass only a frequency of a desired bandwidth and suppress unwanted signals. As shown in FIG. 1, the high-Q bandpass filter is formed of a rectangular parallelepiped having an open upper portion. In the metal housing (1) having a plurality of cavities partitioned at intervals, the input and output connectors (8, 9) mounted on both sides of the housing (1), and each cavity (1a) of the housing (1) An attached dielectric resonator 3 and a lid 7 for shielding the open surface of the housing are provided.

Here, each cavity 1a of the housing 1 is partitioned by a partition 10 in which a window 10a of a predetermined size is formed in the center to adjust the amount of coupling between the dielectric resonators 3, In addition, the inner surface of the housing 1 has a silver-plated structure in order to stabilize electrical performance and maximize conductivity. In addition, the window 10a of the partition 10 has a structure vertically cut from the cavity bottom surface by a predetermined interval, and the interval of the dielectric resonance period mounted in each cavity 1a by the interval of the window 10a. The amount of coupling is adjusted to suppress the generation of unwanted waves.

In addition, the dielectric resonators 3 mounted in the cavities 1a of the housing 1 are supported by the support 5 provided to stand upright on the bottom surface, and the frequency is adjusted on the upper surface of the dielectric resonator 3. Tuning control means for this is provided, the tuning control means in the present embodiment is fixed to the tuning plate 4, the tuning plate 4 to the cover (7) can move the tuning plate (4) up and down It consists of a fixed screw (6).

The inlet and output connectors 8 and 9 of the housing 1 induce electromagnetic waves entering the input and the electromagnetic waves going out the output to deliver only the desired bandwidth, i.e., the bandwidth of the 1.25 MHz, 5 MHz, and 10 MHz frequency bands from the input to the output, and the other frequencies A coupling loop 2 is provided which leads to rereflection at the input.

The coupling loop 2 in this embodiment has a short-circuit structure having a circular cross section and a rectangular structure so that the amount of coupling at the input and output terminals can be finely adjusted.

Referring to the operating state of the present invention configured as described above and the above is as follows.

When miner and RF signals are applied to the input connector 8, electromagnetic waves are induced between the first dielectric resonator 3a through the input coupling loop 2 and the first dielectric resonator 3a and the second dielectric resonator The coupling amount of electromagnetic waves coupled between the first dielectric resonator 3a and the second dielectric resonator 3b is determined according to the size of the window 10a between the third dielectric resonators 3b and the second dielectric resonator 3b and the third dielectric resonator 3b. The coupling coefficient is determined by the size of the window 10a between the three dielectric resonators 3c. Theoretically, the size of the first window and the second window are the same, and electromagnetic waves are induced between the third dielectric resonator and the coupling loop 2 provided on the output side and transmitted to the output connector 9. At this time, only the desired frequency bandwidth is transmitted from the input to the output by the size of each window and the loop at the input / output terminal, and the other unwanted frequency band is reflected back at the input terminal.

In addition, the length of the entire filter is reduced by adjusting the window 10a of the partition 10 to adjust the amount of coupling between the dielectric resonator and the resonator described above by using the window 10a of the partition 10. This can significantly reduce the unwanted clutter.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It is obvious to those who have knowledge of the world.

As described above, according to the present invention, the 1.25MHz, 5MHz, and 10MHz channels can be miniaturized by controlling the window size of the partition partitioning each cavity, thereby suppressing the unnecessary mode signal and greatly reducing the mechanical size. Since the bandpass filter can be configured, it has the effect of providing a good radio wave quality.

Claims (6)

It has a plurality of cavities partitioned inside at predetermined intervals, and a metal housing having input and output connectors on both sides, a dielectric resonator mounted in each cavity of the housing, partitioning each cavity of the housing, electromagnetic wave coupling Multiple partitions with windows for adjusting the amount. And a coupling loop coupled to an input and output connector in the cavity of the housing and for inducing electromagnetic waves to be input and output to pass only a desired bandwidth. 2. The high-Q bandpass filter of claim 1, further comprising a cover covering the upper open surface of the housing and tuning adjustment means mounted through the cover on the dielectric resonator to adjust the resonant frequency. 3. The high-Q bandpass filter of claim 2, wherein the tuning adjustment means comprises a tuning plate mounted on an upper portion of the dielectric resonator and a fixing screw for fine tuning the tuning plate in the vertical direction. The high-Q bandpass filter according to claim 1, wherein the window of the partition is cut vertically by a predetermined distance from the bottom surface of the cavity to the upper end thereof. 2. The high-Q bandpass filter of claim 1, wherein the coupling loop has a rectangular cross section. 2. The high-Q bandpass filter of claim 1, wherein the interior of the housing is silver plated to stabilize electrical performance and maximize conductivity.