CN200965905Y

CN200965905Y - Microwave adjustable filter

Info

Publication number: CN200965905Y
Application number: CN 200620131876
Authority: CN
Inventors: 曾万辉
Original assignee: Beijing Maxwell Tech Co Ltd
Current assignee: Beijing Maxwell Tech Co Ltd
Priority date: 2006-08-11
Filing date: 2006-08-11
Publication date: 2007-10-24
Anticipated expiration: 2016-08-11

Abstract

An adjustable microwave filter comprises a plurality of filter cavities and a tuning copper column. At the top of each filter cavity a mounting hole for copper column is opened, and a circular groove is opened along the horizontal direction of the hole wall. The wear-resistant flexible thin copper wire is winded to produce a clasp spring which is made a lap along the horizontal direction in the circular groove. The tuning copper column is put into the mounting hole, and the clasp spring is around the tuning copper column like scarves, then the clasp spring moderately deforms forced by the two-way squeeze from tuning copper column and the circular groove at the top of filter cavity. The clasp spring restitutes if the tuning copper column is extracted. In the clasp device of tuning copper column of the utility model, a plurality of contact points are arranged between the copper column and the filter cavity top surface for the spring, which ensures better electrical contact and more wearable between the copper column and the filter cavity top surface, and the movement direction of filter cavity more stable perpendicular to the top surface without influence by other forces.

Description

Microwave tunable filter

Technical field

The utility model relates to the microwave waveguide components in a kind of electronic technology, particularly relates to a kind of microwave tunable filter.

Prior art

In the prior art, microwave tunable filter generally uses threaded engagement or adopts the spring leaf chucking that goes in ring to need the copper post of lifting, and threaded engagement is easily lax, how long just follows the string and spring leaf is have more than is needed, all is difficult to guarantee good electrical contact.

As everyone knows, microwave filter conventional machinery tuner, high performance microwave filtering chamber is made up of some filtering chamber, open circular hole at each filtering top of chamber, from circular hole, stretch into copper post one by one, synchronous change copper post inserts the degree of depth in filtering chamber, can change the frequency by filtering chamber microwave, reaches to cause tuning and purpose filtering.

Guarantee the good of electrical properties such as the Insertion Loss standing wave in filtering chamber and filtering bandwidth, need satisfy following condition:

I. copper post and filtering chamber cavity electrically contact good, reliable and stable.

Ii. the copper post should be perpendicular to filtering chamber end face motion (straight up and down), and the copper post is in the not skew (micron dimension) of filtering chamber end face parallel direction in the motion process.

Iii. the gap between copper post and the end face perforate of filtering chamber is as far as possible little.

See also accompanying

drawing

1,2, design in the past, generally all use screw rod to screw in or the belt spring card T3 chucking of use copper post, the former is processed into the screw rod shape to copper post T2, and nut is processed in the hole on the end face T1 of filtering chamber, and utilize the rotation of screw rod to finish the lifting of copper post, this structure will guarantee preceding two unusual difficulties in the above condition owing to reasons such as machining accuracies, and not wear-resisting, along with the 3rd in the above condition of aggravation of wearing and tearing also very difficult the assurance.The latter relatively can guarantee second of above condition, but because spring leaf T3 is easy to wearing and tearing, fluffs, make first, the 3rd to be difficult to guarantee.Effect is all undesirable, and stability, reliability is all poor.

Summary of the invention

In view of this, the purpose of this utility model is to provide a kind of novel microwave tunable filter that can overcome the prior art defective.At filtering chamber end face copper post installing hole circular groove and the spring of holding tightly that is installed in it are set, form the enclasp device of tuning copper post, make electrically contacting of tuning copper post and filtering chamber end face more reliable, anti-wear performance is better, to improve the electrical property of microwave filter.

For achieving the above object, the technical solution of the utility model is: described microwave tunable filter comprises some filtering chamber and tuning copper post, wherein: on each described filtering chamber end face, offer copper post installing hole, open a circular groove along the hole wall horizontal direction, turn to wear-resisting elasticity thin copper wire and to hold spring tightly, hold this tightly spring along continuous straight runs dish in circular groove and become a circle, described tuning copper post is stretched into from copper post installing hole, make hold tightly spring as scarf be trapped among the tuning copper post of this copper post around, appropriateness is out of shape owing to be subjected to the two-way extruding of tuning copper post and filtering chamber end face circular groove to hold spring tightly, if extract tuning copper post out, holding spring tightly can restore to the original state.

Microwave tunable filter of the present utility model is by newly-designed filtering chamber circular groove and the spring of holding tightly that is installed in it, form the enclasp device of tuning copper post, the spring of appropriateness distortion is set up a lot of contact points between copper post and filtering chamber end face, contact point number is similar to the number of turn of spring, in addition, because the elastic force that the spring pressurized produces is basicly stable, the lateral stressed of these contact points can kept stable.These numbers are numerous, the contact point of stability under loading can guarantee the copper post and filtering chamber end face between have good electrical contact.So major advantage of the present utility model is:

1), the electrically contacting more well of copper post and filtering chamber end face, more wear-resisting.

2), the direction of motion of copper post is more stably perpendicular to filtering chamber end face, is not subjected to the influence of other external force.

Description of drawings

Fig. 1 screw-rod structure of the prior art

Fig. 2 spring housing structure of the prior art

Fig. 3 the utility model end view

Fig. 4 the utility model upward view

Embodiment

Below in conjunction with drawings and Examples the utility model is elaborated.

As Fig. 3, shown in 4: microwave tunable filter of the present utility model comprises some filtering chamber 1 and tuning copper post 2: offer copper post installing hole 3 on each described filtering chamber 1 end face, open a circular groove 4 along the hole wall horizontal direction, turn to wear-resisting elasticity thin copper wire and to hold spring 5 tightly, hold this tightly spring 5 along continuous straight runs dish in circular groove 4 and become a circle, described tuning copper post 2 is stretched into from copper post installing hole 3, make hold tightly spring 5 as scarf be trapped among the tuning copper post 2 of this copper post around, appropriateness is out of shape owing to be subjected to the two-way extruding of tuning copper post 2 and filtering chamber 1 end face circular groove 4 to hold spring 5 tightly, if extract tuning copper post 2 out, holding spring 5 tightly can restore to the original state.

The spring 5 of holding tightly of appropriateness distortion is set up a lot of contact points between tuning copper post 2 and filtering chamber 1 end face, contact point number is similar to this number of turn of holding spring 5 tightly, in addition, because it is basicly stable to hold the elastic force of spring 5 pressurizeds generation tightly, the lateral stressed of these contact points can kept stable.

These numbers are numerous, the contact point of stability under loading can guarantee tuning copper post 2 and filtering chamber 1 end face between have good electrical contact.And in former several schemes contact point number, the contact pressure of tuning copper post and filtering chamber end face all be at random, uncontrollable, also be unsettled.Therefore its electrical contact performance can't be held, and is unstable, and along with wearing and tearing aggravation performance is easy to rapid deterioration.

Because the high performance microwave filter generally has a lot of filtering chambeies 1, guarantee about tuning copper post 2 unifications in each filtering chamber 1, the utility model adopts a driven in synchronism cover plate 6 to come each tuning copper post 2 of driven in synchronism, at the top of each tuning copper post 2 top cover 7 is set, described driven in synchronism cover plate 6 is placed on this top cover 7.Reciprocal motion then on each tuning copper post 2 lifting spring 8 of cover solve, this lifting spring 8 is enclosed within on the filtering chamber 1 between the end face and top cover 7 bottom surfaces.

For the inclination that reduces driven in synchronism cover plate 6 influence to the directivity of copper post, driven in synchronism cover plate 6 directly is not fixed together with tuning copper post 2, but pressure is passed to tuning copper post 2: between the top cover 7 of described driven in synchronism cover plate 6 and each tuning copper post 2, be provided with a little steel ball 9 by a little steel ball 9.

Structure of the present utility model successful Application reaches and causes good result on the mechanical tuning microwave filter of the communication relay equipment that Beijing Maxwell Tech. Co., Ltd. produces.For the high-performance waveguide filter of one six resonant cavity, its actual measurement index reaches standing wave＜1.2, Insertion Loss＜1.0db, and passband shapes is constant substantially in than wide tuning range.

Claims

1, a kind of microwave tunable filter, comprise some filtering chamber (1) and tuning copper post (2), it is characterized in that: on each described filtering chamber (1) end face, offer copper post installing hole (3), open a circular groove (4) along the hole wall horizontal direction, turn to wear-resisting elasticity thin copper wire and to hold spring (5) tightly, hold this tightly spring (5) along continuous straight runs dish in circular groove (4) and become a circle, described tuning copper post (2) is stretched into from copper post installing hole (3), make hold tightly spring (5) as scarf be trapped among the tuning copper post of this copper post (2) around, appropriateness is out of shape owing to be subjected to the two-way extruding of tuning copper post (2) and filtering chamber (1) end face circular groove (4) to hold spring (5) tightly, if extract tuning copper post (2) out, holding spring (5) tightly can restore to the original state.

2, microwave tunable filter according to claim 1, it is characterized in that: described microwave tunable filter also comprises a driven in synchronism cover plate (6), at the top of each tuning copper post (2) top cover (7) is set, described driven in synchronism cover plate (6) is placed on this top cover (7), be with a lifting spring (8) on each tuning copper post (2), this lifting spring (8) is enclosed within filtering chamber (1) and goes up between end face and top cover (7) bottom surface.

3, microwave tunable filter according to claim 2 is characterized in that: between the top cover (7) of described driven in synchronism cover plate (6) and each tuning copper post (2), be provided with a little steel ball (9).