CN201117770Y - Low loss high selectivity filter - Google Patents

Abstract

A low wastage high selectivity fitter is provided with a body formed by parallel rectangle cavities, a cover plate, inner conductors of the resonance cavities, resonance frequency adjusting bolts, adjusting bolts for the coupling intensity between cavities, an input interface and an output interface. The resonance cavities are arranged in the body; at least three parallel rectangle cavities are arranged in the body; each rectangle cavity is provided with two resonance cavity in one line; all the resonance cavities are arranged in an 'S' shape; centralized coupling is arranged between two resonance cavities serially connected between neighboring lines; distributed coupling is between two neighboring resonance cavities in each line; an open isolated cavity coupling device is arranged between the resonance cavity at the end of the output interface and the resonance cavity in parallel and arranged opposite to an insulating wall; the utility model adopts the mode of organically combining the distributed coupling and the centralized coupling and operates the isolated cavity crossing coupling technology to lead the filter to realize low energy consumption and high selectivity as well as not generating signal interference, thus adopting the requirements of wireless communication development.

Description

The low loss high selectivity filter

Technical field

The utility model relates to the microwave filter of using in a kind of wireless communication field, particularly a kind of low loss high selectivity filter.

Background technology

In all kinds of Wireless Telecom Equipments of modern times, for example GSM/CDMA/PCS/DCS mobile communication high-power wireless base station, Digital Clustering high-power wireless base station etc. all need a kind of can by high-power, have high selectivity energy, a wave filter technology, and based on the various critical components of this art designs, as place the transceiving filter of base station, place the tower amplifier under the antenna for base station, and place that the base station delivery outlet is used for high-power amplification close road splitter or the like.But, with regard to present technical merit, can pass through powerful filter for one, seek out very high selection performance, also have many technological difficulties.Existing TEM film multicavity filter has two kinds of versions commonly used: the multicavity filter of distributed couplings and the adjustable multicavity filter of centralized coupling.The former generally in the main body that conventional cast processes the broach shape insert a plurality of inner wires, be formed centrally a plurality of rectangular cavities in inner wire being, screw in the resonance frequency adjustment screw relative from the cavity opposite side with inner wire, the filter two ends have end plate, and input and output connector joins with filter two ends cavity respectively.This Filter Design is ripe with manufacturing, it is also less to insert loss, the problem that exists is the Fixed Design that is coupled as between the adjacent resonators, passband width is non-adjustable, be unfavorable for the design and the manufacturing of many kinds series of products, and when passband width required constriction, the distributed couplings district extended thereupon, increased the volume of filter.The latter mostly is that rotary-cut processes a plurality of cylindrical cavities (or rectangular cavity) in the bulk metal piece, also has inner wire and resonance frequency adjustment screw, has intercommunicating pore between the adjacent resonators, in connection place, regulates the coupling amount between the resonant cavity by the extrapolation screw rod.The major advantage of this filter is that after product was made, performances such as ripple, input and output standing-wave ratio fully be adjusted to and reach satisfactory result in can and being with passband width.The problem that exists is that screw device is relatively more clumsy, and the insertion loss is also bigger, and under the more situation of resonant cavity requirement, difficulty of processing increases, and technological debugging work is quite loaded down with trivial details, complicated, time-consuming.Since the last century the nineties, in land mobile communication system and digital clustering communication system, generally adopt the adjustable multicavity filter of a kind of centralized coupling (Motorola Inc., Ericsson, Korea S KMW Inc. all adopt this filter product), in the main body of bulk metal piece, process a plurality of rectangles or cylindrical coaxial cavity that honeycomb fashion is arranged, cylindrical inner conductor is installed in the chamber, must from body portion from upper cover plate screw in the resonance frequency adjustment screw corresponding with inner wire, increased the difficulty of Installation and Debugging.The filter of this structure mainly relies on the cross section that enlarges coaxial cavity, improve the precision of machining and plating measures such as (for example electroplates) is carried out on the surface reduced its loss, improve its optionally approach mainly be reasonable arrangement between the chamber, and increase the separate space coupled structure and realize the separate space coupling.Its shortcoming mainly is a high material consumption, and the processing technology complexity requires height, and difficulty is big, and production efficiency is low, and the production cost height is difficult to produce in enormous quantities, can not adapt to the requirement of communication technology fast development.

At present, the multicavity filter of in wireless communication field, using, its signal-selectivity is relatively poor, is easy to generate interfering with each other of signal, can not adapt to the requirement of high selectivity.

Summary of the invention

Technical problem to be solved in the utility model is, overcomes the shortcoming of prior art, and a kind of low loss high selectivity filter is provided.

The technical scheme that its technical problem that solves the utility model adopts is as follows: a kind of low loss high selectivity filter, has the main body that parallel rectangular cavity is formed, cover plate, the resonant cavity inner wire, the resonance frequency adjustment screw, stiffness of coupling adjustment screw between the chamber, input interface, output interface, be arranged with resonant cavity in the main body, it is characterized in that having in the main body 3 parallel rectangular cavity, be provided with 2 resonant cavitys of 1 row in each rectangular cavity, all resonant cavitys are pressed the serpentine ordering, between two resonant cavitys that sequence number links to each other between the adjacent column is centralized coupling, be distributed couplings between adjacent two resonant cavitys in every row, the resonant cavity of output interface end and go together with it and between the resonant cavity on partition wall opposite, have open circuit separate space coupling device.

The beneficial effects of the utility model are as follows: the mode that the employing distributed couplings of the utility model filter and centralized coupling organically combine, and used separate space cross-couplings technology, make this filter realize low-loss, high selectivity, can not produce the situation that signal disturbs, can adapt to the demand of radio communication development; This performance of filter is superior, the reliability height, of many uses, can design serial multicavity filter, with it is the basic transceiving filter that can design mobile communication, microwave radio relay communication, digital cluster communication and wireless access base station etc., for wireless communication engineering provides a kind of desirable core filter device; Filter construction is simple, compact, ingenious; volume is little; debugging work load reduces; processing technology is simplified greatly; its main body can be by ripe aluminum extrusion process one-shot forming; the filter of same type only need leave a kind of mould; number of molds is few, thoroughly changes the processing technology of traditional centralized coupling filter, and product repeats high conformity; do not need coating surface; consumptive material is few, the production efficiency height, and production cost can reduce by 80%; be easy to realize the large-scale production of many kinds, adapt to the requirement of communication technology fast development.

Description of drawings

Fig. 1 looks cutaway view for the utility model low loss high selectivity filter master.

Embodiment

With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in further detail.But the utility model is not limited to given example.

As shown in Figure 1, the utility model low loss high selectivity filter, has the main body 1 that parallel rectangular cavity is formed, cover plate 2, resonant cavity inner wire 31, resonance frequency adjustment screw (not drawing among the figure), stiffness of coupling adjustment screw (not drawing among the figure) between the chamber, input interface 4, output interface 5, be arranged with resonant cavity 3 in the main body 1, have 3 parallel rectangular cavity in the main body, be provided with 2 resonant cavitys of 1 row in each rectangular cavity, all resonant cavitys are pressed the serpentine ordering, as shown in Figure 1, from the input interface end to the output interface end, resonant cavity label successively is A1, A2, A6, between two resonant cavitys that sequence number links to each other between the adjacent column (between A2 and A3, between A4 and the A5) be centralized coupling, in every row between adjacent two resonant cavitys (between A1 and A2, between A3 and the A4, between A5 and the A6) be distributed couplings, the resonant cavity A6 of output interface end and go together with it and between the resonant cavity A3 on partition wall 11 opposites, have open circuit separate space coupling device 6.

Among the embodiment as shown in Figure 1, input interface 4 is positioned at the middle part of main body 1 side.

Filter is fixing for convenience, and among the embodiment as shown in Figure 1, the rear portion of main body 1 has fixedly muscle 7, fixedly has holddown groove 71 on the muscle 7; Another kind of fixed form is, the back of main body has fixing threaded hole, and screw hole is over against the partition wall of body interior.

Claims (4)

1, a kind of low loss high selectivity filter, has the main body that parallel rectangular cavity is formed, cover plate, the resonant cavity inner wire, the resonance frequency adjustment screw, stiffness of coupling adjustment screw between the chamber, input interface, output interface, be arranged with resonant cavity in the main body, it is characterized in that having in the main body 3 parallel rectangular cavity, be provided with 2 resonant cavitys of 1 row in each rectangular cavity, all resonant cavitys are pressed the serpentine ordering, between two resonant cavitys that sequence number links to each other between the adjacent column is centralized coupling, be distributed couplings between adjacent two resonant cavitys in every row, the resonant cavity of output interface end and go together with it and between the resonant cavity on partition wall opposite, have open circuit separate space coupling device.

2, low loss high selectivity filter according to claim 1 is characterized in that described input interface is positioned at the middle part of main body side.

3, low loss high selectivity filter according to claim 1 and 2 is characterized in that the rear portion of described main body has fixedly muscle, has holddown groove on the described fixedly muscle.

4, low loss high selectivity filter according to claim 1 and 2 is characterized in that the back of described main body has fixing threaded hole, and this screw hole is over against the partition wall of body interior.

Images