CN201868543U

CN201868543U - Waveguide filter

Info

Publication number: CN201868543U
Application number: CN 201020509759
Authority: CN
Inventors: 刘杰; 邓贤进; 刘祥; 肖仕伟; 吴尚昀
Original assignee: Institute of Electronic Engineering of CAEP
Current assignee: Institute of Electronic Engineering of CAEP
Priority date: 2010-08-30
Filing date: 2010-08-30
Publication date: 2011-06-15
Anticipated expiration: 2020-08-30

Abstract

The utility model discloses a waveguide filter. The waveguide filter comprises an input low-pass filter unit (1), a first impedance conversion unit (2), a band-pass filter unit (3), a second impedance conversion unit (4) and an output low-pass filter unit (5) which are sequentially connected in series. The waveguide filter has the benefits of large power capacity, capabilities of both transmitting-receiving isolation and harmonic suppression, and the like.

Description

A kind of waveguide filter

Technical field

The utility model relates to a kind of waveguide filter, belongs to communication technical field.

Background technology

In the vehicle-mounted ground mobile radio station that uses in trunking traffic, volume is subjected to the restriction of highway transportation, and antenna is often little than fixed station, and this has just determined power amplifier need launch bigger power could guarantee proper communication; Often adopt the mode of frequency division multiplexing to carry out duplex communication in the communication, this just requires the vehicle-mounted ground mobile radio station when the transmission data, can not disturb the data that oneself receive; Under the prerequisite that guarantees ground station's proper communication, must avoid the harmonic wave of tranmitting frequency to occupy other communication apparatus communication frequencies simultaneously.Therefore, behind the power amplifier of vehicle-mounted ground mobile radio station, must connect the high power filter that a high power capacity and harmonic wave suppress.

In the prior art, reach filter high-power and harmonic wave inhibition index, what mainly adopt is the filter of pectinate line structure.The input/output port of comb line filter generally is a coaxial fitting, connection be coaxial cable.Owing to reasons such as the coaxial fitting physical size are little, make the power capacity of filter be restricted, and the insertion loss ratio of comb line filter is bigger, needing more in the vehicle-mounted ground mobile radio station, the filter of high power capacity substitutes it.

Summary of the invention

The technical problems to be solved in the utility model is to overcome existing defective, and a kind of waveguide filter is provided, and realizes that the power capacity of filter is bigger.

In order to solve the problems of the technologies described above, the utility model provides following technical scheme:

A kind of waveguide filter, comprising input low-pass filter unit (1), the first impedance conversion unit (2), bandpass filtering unit (3), the second impedance conversion unit (4), output low-pass filter unit (5), connects successively with output low-pass filter unit (5) in described input low-pass filter unit (1), the first impedance conversion unit (2), bandpass filtering unit (3), the second impedance conversion unit (4).

Preferably, described input low-pass filter unit (1) is the bending waveguide with output low-pass filter unit (5).

Preferably, described bandpass filtering unit (3) is the waveguide of E facial mask sheet shape.

From above scheme as can be seen, the utility model is a waveguide filter, what adopt is waveguiding structure, the waveguide power capacity is bigger 1 more than the order of magnitude than the power capacity of the employed coaxial cable of filter of pectinate line structure in the prior art, the utility model waveguide filter power capacity surpasses 1200W, at present at home, its power capacity is unprecedented in the filter manufacturing industry.As seen not only the filter power capacity than pectinate line structure in the prior art is big for the utility model waveguide filter power capacity, and its power capacity at home the filter industry rank the first.In addition, waveguide loss is little, and the loss of the utility model waveguide filter is less than 0.2dB, and visible the utility model waveguide filter also has the little advantage of loss.

Description of drawings

Accompanying drawing is used to provide further understanding of the present utility model, and constitutes the part of specification, is used from explanation the utility model with embodiment one of the present utility model, does not constitute restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the theory diagram of waveguide filter of the present utility model;

Fig. 2 is the left half cavity of waveguide filter of the present utility model and the structural representation in right half chamber;

Fig. 3 is the structural representation of waveguide filter of the present utility model.

Embodiment

Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in qualification the utility model.

Embodiment 1

As shown in Figure 1, be the theory diagram of waveguide filter of the present utility model, comprise that the low pass unit is that input waveguide low pass filter 1 and output waveguide low pass filter 5, impedance unit are that first impedance transformer 2 and second impedance transformer 4, the logical unit of band are waveguide bandpass filter 3; The input waveguide low pass filter 1 and first impedance transformer 2 are connected in series, first impedance transformer 2 is connected in series with waveguide bandpass filter 3, the logical waveguide filter 3 of waveguide band and second impedance transformer 4 are connected in series, and impedance transformer 4 is connected in series with output waveguide low pass filter 5.

As Fig. 2, shown in Figure 3, be the structural representation of waveguide filter of the present utility model, comprise diaphragm 1, right half chamber 2, left half cavity 3, screw 4, it is middle with left half cavity 3 that diaphragm 1 is arranged at right half chamber 2, and right half chamber 2 is fixing by screw 4 with left half cavity 3.Its waveguide aperture is the BJ22 standard.

Above-mentioned described input and output waveguide lowpass is the bending waveguiding structure, and described bending waveguiding structure is the waveguiding structure that has the arc camber that is different from straight wave guide, and its structure is same as bending waveguiding structure of the prior art; Simultaneously, described waveguide bandpass filter is an E facial mask sheet waveguiding structure, and described E facial mask sheet waveguiding structure also is same as prior art.

The operation principle of waveguide filter of the present utility model is: waveguide filter of the present utility model is operated in S-band in trunking traffic, and be high power filter, the position that waveguide filter of the present utility model is installed in mobile radio station is between the feed of travelling-wave tube amplifier and antenna, one end of waveguide filter is connected to the travelling-wave tube amplifier output by ring flange, the other end is connected to the feed end of antenna by ring flange, and the interface of waveguide filter is symmetrical, do not have directivity.The HIGH-POWERED MICROWAVES signal of travelling-wave tube amplifier output by ring flange, enters in the waveguide filter, and waveguide filter at first becomes TE with the HIGH-POWERED MICROWAVES signal bondage ₁₀Pattern becomes TE then ₁₀The HIGH-POWERED MICROWAVES signal of pattern enters the input waveguide low pass filter of waveguide bend structure, harmonic wave deal to the HIGH-POWERED MICROWAVES signal suppresses, simultaneously with Narrow Wall of Waveguide limit reduced size, by waveguide bandpass filter by E facial mask sheet waveguiding structure, the frequency wave outer to bandwidth suppresses, and forms passband; The output waveguide low pass filter that while HIGH-POWERED MICROWAVES signal enters once more by the waveguide bend structure suppresses the harmonic component of HIGH-POWERED MICROWAVES signal once more, simultaneously Narrow Wall of Waveguide limit size is amplified, return to the size of input, enter like this that the microwave signal of having passed through waveguide filter output just has certain passband and certain harmonic wave suppressed; Simultaneously, because the waveguide power capacity is very big, make this waveguide filter realize the high power capacity effect.

Wherein, the utility model waveguide filter design objective is: filter is operated in S-band (2-4GHz), power capacity surpasses 1200W, loss suppresses greater than 80dBc greater than 45dBc and harmonic wave less than 0.2dB, bandwidth 95MHz, transmitting-receiving isolation, receives and dispatches the 80MHz that is spaced apart between frequency range.

It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. waveguide filter, comprising input low-pass filter unit (1), the first impedance conversion unit (2), bandpass filtering unit (3), the second impedance conversion unit (4), output low-pass filter unit (5), it is characterized in that: connects successively with output low-pass filter unit (5) in described input low-pass filter unit (1), the first impedance conversion unit (2), bandpass filtering unit (3), the second impedance conversion unit (4).

2. waveguide filter according to claim 1 is characterized in that: described input low-pass filter unit (1) is the bending waveguide with output low-pass filter unit (5).

3. waveguide filter according to claim 1 is characterized in that: described bandpass filtering unit (3) is the waveguide of E facial mask sheet shape.