GB2548474A - Filter apparatus and a method of assembling and/or washing the same - Google Patents
Filter apparatus and a method of assembling and/or washing the same Download PDFInfo
- Publication number
- GB2548474A GB2548474A GB1702211.2A GB201702211A GB2548474A GB 2548474 A GB2548474 A GB 2548474A GB 201702211 A GB201702211 A GB 201702211A GB 2548474 A GB2548474 A GB 2548474A
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- GB
- United Kingdom
- Prior art keywords
- raised
- sections
- outwardly protruding
- body portion
- protruding members
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The filter apparatus includes a body portion having at least one resonant cavity with resonating means located therein or associated therewith when the apparatus is assembled. The at least one resonant cavity has an opening defined in a first surface of the body portion. One or more parts of the first surface have one or more raised or outwardly protruding members or sections 30 defined thereon. The method includes the step of engaging a lid member 24 with the one or more raised or outwardly protruding members or sections such that a gap 26 is defined between an inwardly facing surface of the lid and an area 28 of the first surface of the body portion which is recessed relative to the one or more raised or outwardly protruding members or sections on said first surface. With the lid member engaged to the body portion, the method includes the step of washing and/or cleaning the filter apparatus in a wash fluid, and subsequently draining the wash fluid from the filter apparatus via the gap defined between the lid member and the recessed area of the first surface of the body portion. .
Description
Filter Apparatus and a Method of Assembling and/ot Washing the same
This invention relates to filter apparatus and to a method of assembling and/or washing the filter apparatus.
The filter apparatus referred to in this application is of a type to receive and/or transmit radio frequency signals within specified radio frequency bands as part of a witeless communication network. An example of such filter apparatus is that which is used in transceiving apparatus for wireless communication apparatus such as Base Transceiver Stations (BTS) for mobile or cell phone networks.
Conventional filter apparatus typically comprises a body of electrically conductive material with a plurality of resonant cavities defined therein to allow the filter to operate in a desired manner. In particular, each resonant cavity typically has a resonator provided therein which is capable of resonating at a desired frequency in use. A lid having an inwardly facing electrically conductive surface is provided over the openings of the resonant cavities to close the filter apparatus and to enclose the resonant cavities. A top surface of the filter body that defines the openings of the resonant cavities is provided as a flat surface to allow a good electrical contact to be made between the inwardly facing flat surface of the lid and the top surface of the filter body. Both the lid and the top surface of the filter body have to be made to tight specifications to ensure good electrical contact is achieved between the same. In addition, a large number of screws are used to engage the Ud to the filter body to ensure good electrical contact between the lid and filter body. Good electrical contact between the lid and the filter body is essential in order for good passive intermodulation (PIM) performance of the filter.
Problems associated with conventional filter apparatus is that the fitting of the lid to the filter body and the insertion of aU the fixing screws is a labour intensive process, which increases the cost and time for producing the filter apparatus. Minor deviations in the specification of the Ud and/or the filter body can lead to poor electrical contact between the Ud and the filter body, thereby creating a non-Unear effect which generates PIM problems. High power transmit signals passing through the filter apparatus in use pass through the non-linear junction created between the Ud and filter body, thereby creating a PIM product that can faU within the receive band of the mobile cell site, which can result in desensiti2ation of the receiver at the ceU site. This has a negative impact on the coverage and up-Unk capacity of the mobile ceU site. Problems can also arise in the areas between the Ud and / filter body where there are no fixing screws present. The contact pressure in these areas is reduced, thereby leading to intermittent electrical contact between the Ud and filter body and the formation of PIM problems. This problem increases with increasing distance from a fixing screw.
It is therefore an aim of the present invention to provide filter apparatus which overcome the abovementioned problems.
It is a further aim of the present invention to provide a method of using filter apparatus that overcomes the abovementioned problems.
It is a yet further aim of the present invention to provide a method of assembUng and/or washing filter apparatus.
According to a first aspect of the present invention there is provided a method of assembling and/or washing filter apparatus, said filter apparatus including a body portion having at least one resonant cavity with resonating means located therein or associated therewith when the apparatus is assembled, said at least one resonant cavity having an opening defined in a first surface of the body portion, and wherein one or more parts of the first surface have one or more raised or outwardly protruding members or sections defined thereon, said method including the step of engaging a lid member with the one or more raised or outwardly protruding members or sections such that at least one gap is defined between an inwardly facing surface of the lid and an area of the first surface of the body portion which is recessed relative to the one or more raised or outwardly protruding members or sections on said first surface, characterised in that with the lid member engaged to the body portion, said method includes the step of washing and/or cleaning the filter apparatus in a wash and/or cleaning fluid, and subsequently draining and/or removing the wash and/or cleaning fluid from the filter apparatus via the gap defined between the lid member and the recessed area of the first surface of the body portion.
Thus, the present invention recesses areas of the first surface of the filter body with respect to raised or protruding members or sections of the first surface which engage with the lid member. When the Ud member is attached to the raised or protruding members or sections of the filter body in use, the lid member typically only contacts the raised or protruding members or sections. This results in clear areas of high contact pressure between the raised or protruding members or sections and the lid member. The one or more relatively recessed areas of the first surface make no contact with the lid member, thereby removing the problems associated with the prior art of areas between the filter body and Hd member having low contact pressure or intermittent contact. The present invention therefore significantly improves PIM performance of the filter apparatus. A further advantage of the present invention is that the gap or gaps defined between the inwardly facing surface of the lid member and the relatively recessed areas of the first surface allows the filter apparatus to be washed and/or cleaned with the hd member engaged to the body portion. ConventionaUy the hd member has to be removed to ahow the filter body to be washed and drained. In one example in which the hd member is attached to the first surface of the filter body portion via screws, as the screws are inserted into screw apermres defined in the filter body portion it is often the case that small amounts of dust and/or debris are released from the screw aperture onto the filter body and/or into the resonant cavities. This dust and debris can cause PIM problems. In the present invention, since the lid member can be attached to the filter body portion when it is washed/cleaned and drained, this removes any dust and/or debris that may have been generated or moved when the screws were being inserted into the filter body or other attachment means were being fitted to attach the lid member to the filter body.
In addition, when one or more tuning screws are located through the hd member when the hd is fitted to the body portion and are rotated to provide the required frequency response of the filter apparatus, this fitting and rotation of the tuning screws can also produce dust and debris within the interior of the filter apparatus which can cause PIM problems. The one or more tuning screws are t)^ically fitted externally of the assembled filter apparatus. A portion of the tuning screw passes through an aperture in the assembled hd member such that a portion of the tuning screw protrudes inwardly into the interior of the filter body, such as for example in into a resonant cavity. Rotation of the tuning screw in use changes the degree of penetration of the screw into the resonant cavity, thereby allowing adjustment of the frequency response of the filter. The washing and/or cleaning process provided by the present invention also aUows the dust and debris firom the filter tuning process to be removed.
In one embodiment the wash and/or cleaning fluid is a hquid.
In one embodiment the wash and/or cleaning fluid is a gas.
In one embodiment the wash and/or cleaning fluid include a hquid and a gas.
In one embodiment the wash and/or cleaning fluid enters and leaves the filter apparatus via the at least one gap.
Preferably the wash and/or cleaning fluid is any fluid or any combination of fluids which allow one or more surfaces of the body portion of the filter apparatus to be washed and/or cleaned in use. For example, the wash fluid could be water, distilled water and/or the like.
Preferably the at least one gap is defined between a peripheral edge of the lid member and one or more edges of the body portion and/or a relatively recessed area of the first surface.
Preferably the gap or gaps are defined between two or more peripheral edges of the Ud member and one or more edges of the body portion and/or a relative recessed area of the first surface.
Preferably the gap or gaps are defined around the entire or substantially entire peripheral edges of the Hd member.
Preferably the lid member engages with the one or more raised or outwardly protruding members or sections so as to cover or substantially cover the at least one resonant cavity opening in use.
Preferably the lid member only contacts the one or more raised sections or outwardly protruding members or sections on the first surface and does not contact the relatively recessed areas or non-protmding areas of the first surface.
Preferably the Ud member is attached to the first surface of the filter body, and preferably to the one or more raised or outwardly protmding members or sections of the first surface via attachment means.
Preferably attachment means are provided on, defined in and/or are associated with the one or more raised or outwardly protmding members or sections.
Preferably the attachment means include any or any combination of one or more apertures, screw apertures, screws, nuts and bolts, cUps, adhesive, soldering, welding and/or the like.
In a preferred embodiment the one or more raised or outwardly protruding members or sections have one or more screw apertures defined in the same. This preferably allows the lid member to be engaged to the raised or protruding members or sections via one or more screws in use.
Preferably the one or more raised or outwardly protruding members or sections are provided at or adjacent one or more edges of the first surface defining the one or more openings of the at least one resonant cavity.
Preferably two or more, or a plurality, of raised or outwardly protruding members or sections are defined on the first surface and said two or more or plurality of members or sections are a spaced distance apart on the first surface.
Preferably the one or more relatively recessed areas of the first surface is/are separate to, independent of and/or are not the surface or surfaces defining one or more interior surfaces of the at least one resonant cavity.
Preferably the lid member is engaged with the one or more raised or outwardly protruding members or sections of the filter body so as to close or substantially close the opening(s) of the at least resonant cavity of the filter body.
In one embodiment two or more Ud members can be provided to engage with the one or more raised or outwardly protmding members or sections of the filter body so as to cover or substantially cover the at least one resonant cavity.
In one embodiment a single lid member is used to cover or substantially cover two or more or all the resonant cavities of the filter body.
Preferably at least the inwardly facing surface of the lid (i.e. the surface that is arranged to face towards an opening of the one or more resonant cavities when fitted to the filter body in use) is formed from and/or includes an electrically conductive material or materials, one or more electrically conductive coatings and/or layers, printed circuit board (PCB) and/or the like.
Preferably the one or more areas of the first surface of the filter body that are relatively recessed is/are planar, flat, substantially planar or substantially flat.
In one embodiment the one or more areas of the first surface of the filter body that are relatively recessed with respect to the one or more raised or outwardly protruding members, sections or parts of the first surface are recessed with respect to the same or substantially the same depth, degree, height and/or distance.
In one embodiment one or more areas of the first surface of the filter body that are relatively recessed with respect to the one or more raised or outwardly protmding members, sections or parts of the first surface have two or more sections that are at different heights, depths, degree or distances. Thus, in one embodiment, the recessed areas of the first surface of the body portion can be at different heights/distance/depths if required.
Preferably the one or more raised or outwardly protruding members or sections of the first surface protrude relatively to the recessed areas perpendicularly, substantially perpendicularly, have a narrowing or diverging tapered, and/or at an acute angle.
In one embodiment a top edge of a wall defining the one or more raised or outwardly protruding members or sections or screw apertures can be flat, planar, substantially flat, substantially planar, rounded, curved, convexed, stepped and/or the like.
In one embodiment the one or more raised or outwardly protruding members or sections defining the opening(s) of the one or more screw apertures are not flush with one or more areas of the first surface which are relatively recessed or are not prottuding from the first surface.
Preferably the filter body is formed from, includes or is provided with one or more electrically conductive materials, coatings and/or layers. Further preferably the outermost surface of the filter body is formed from, includes or is provided with one or more electrically conductive materials, coatings and/or layers.
Preferably the one or more screw apertures are blind apertures made in the filter body with the openings in the first surface.
Preferably one or more walls of the filter body defining one or more interior walls of the one or more screw apertures are threaded. This allows engagement with complementary threaded screws in use.
Preferably the lid member is arranged to be a spaced distance apart from the relatively recessed areas of the first surface of the body portion when fitted to the one or more raised or outwardly protruding members or sections in use.
In one embodiment a plurality of screw apertures or attachment means are provided in one protmding or raised member or section or the first surface.
In one embodiment a single screw aperture can be provided in one protruding or raised member or section.
In one embodiment the one or more protruding or raised members or sections in which the one or more screw apermres are defined is a continuous member or includes two or more non-continuous members.
Preferably the one or more protruding or raised members or sections define one or more side walls of at least one screw aperture.
Preferably the one or more protruding or raised members or sections are in the form of one or more sleeve members with a screw aperture defined therein.
Preferably the resonating means can be located in the at least one resonant cavity prior to engaging of the lid member and/or the resonating means can be provided on or associated with the lid member such that on engagement of the lid member with the body portion, the resonating means are located in the at least one resonant cavity.
According to a further aspect of the present invention there is provided a method of forming or manufacturing filter apparatus.
According to one aspect of the present invention there is provided a method of using filter apparatus.
According to one aspect of the present invention there is provided filter apparatus, said filter apparatus including a body portion having at least one resonant cavity defined therein for the location of resonating means therein in use, said at least one resonant cavitj'^ having an opening defined in a first surface of the body portion, and wherein one or more parts of the first surface has one or more raised or outwardly protruding members or sections defined thereon.
Preferably the apparatus includes a lid member and the lid member is engaged or adapted to be engaged with the one or more raised or outwardly protruding members or sections in use.
Preferably the Ud member and the one or more raised or outwardly protruding members or sections are arranged such that at least one gap is defined between an inwardly facing the surface of the lid member and an area of the first surface of the body portion that is recessed relative to the one or more raised or outwardly protmding members or sections on the first surface.
Preferably the at least one gap is of such size, shape, design and/or dimensions to allow wash and/or cleaning fluid to be inserted therethrough to allow washing of the interior of the filter body in use when the lid is assembled on the filter body, and to allow draining and/or removal of the wash and/or cleaning fluid from filter body with the ltd assembled on the filter body (i.e. without removal of the lid from the filter body).
Preferably the inwardly facing surface of the hd member is planar, flat, substantially planar or substantially flat.
According to one aspect of the present invention there is provided filter apparatus, said filter apparams including a body portion having at least one resonant cavity with resonating means located therein, said at least one resonant cavity having an opening defined in a first surface of the body portion, and wherein one or more parts of the first surface has one or more raised or outwardly protmding members or sections defined thereon, a lid member is engaged with the one or more raised or outwardly protmding members or sections such that at least one gap is defined between an inwardly facing the surface of the Hd member and an area of the first surface of the body portion that is recessed relative to the one or more raised or outwardly protmding members or sections on the first surface, and wherein said at least one gap is of such size, shape, design and/or dimensions to allow wash and/or cleaning fluid to be inserted or pass therethrough in use to allow washing of the interior of the filter body in use when the Hd is assembled on the filter body, and to aUow draining and/or removal of the wash and/or cleaning fluid from filter body with the Hd assembled on the filter body.
It wHl be appreciated that any of the abovementioned features can apply both to the method and/or the apparatus.
Embodiments of the present invention will now be described with reference to the accompanying figures, wherein:
Figure 1 (PRIOR ART) is a perspective view of a conventional filter body;
Figure 2 is a perspective view of a filter body according to an embodiment of the present invention;
Figure 3 is an enlarged view of part of the filter body showing the screw holes and the surrounding recessed surface in one embodiment;
Figures 4a and 4b show examples of cross sections of screw apertures according to embodiments of the present invention;
Figure 5 is a side view of a filter body with Hd according to an embodiment of the present invention.
Referring firstly to figure 1 (PRIOR ARl), there is illustrated a conventional filter body 2 having a plurality of resonant cavities 4 defined therein for the location of resonating means in the form of, for example, a resonator post, in use.
The filter body has a base surface 6, side walls, 8, 10, 12, 14 and a top surface 16. The top surface 16 defines the openings 18 to the resonant cavities 4. A plurahty of screw apertures 20 are defined in top surface 16. The openings of the screw apertures 20 are defined in top surface 16 and the openings to the screw apertures 20 are flush with the top surface 16. The top surface 16 is flat and planar. A problem associated with this filter design is that when a hd (not shown) is attached to the top surface 16 by inserting screws into apertures 20, it creates areas of relatively high contact pressure between the Hd and the top surface adjacent the screw apertures, and areas of relatively lower contact pressure between the Hd and the top surface a spaced distance from the screw apertures. The difference in contact pressure in different areas between the lid and the top surface of the body portion can result in PIM performance problems for the filter. In addition, as the screws are inserted into the screw apertures 20 to engage the Hd with the filter body, dust and debris can often be generated within the filter body and/or resonant cavities which can cause PIM performance problems.
Referring to figures 2-5, the applicants have found that by recessing the area 22 of the top surface 16 adjacent the screw apertures 20 of a filter body 102, this creates clearly defined areas of high contact pressure between a Hd 24 and the screw apertures, and clearly defined areas of no contact pressure between the lid 24 and the body portion 102 (i.e. a gap 26 is formed between the lid and the top surface 16). The Applicants have designed this gap 26 to be of such shape, size and dimensions to allow wash fluid to flow freely or relatively unhindered through the gap between the lid and the top surface into the filter body and the resonant cavities to allow washing of any dirt and debris contained therein. The gap also allows the wash fluid to be subsequently drained from the apparatus \vithin removal of the Ud.
Thus, referring to figures 2 and 3, an embodiment of the present invention is shown wherein the top or first surface 16 of filter body 102 has a first recessed area 28 and a second recessed area 22. The first recessed area 28 is at a first lower height (or first depth) with respect to the walls 30 and top edge 32 of the first surface 16 defining the screw apertures 20. The second recessed area 22 is at a second lower height (or second depth) with respect to the walls 30 and top edge 32 defining the screw apertures. The recess height or depth of the second recessed area 22 is greater than the recess height or depth of the first recessed area 28.
Although figure 2 shows recessed areas having different heights/depths, it will be appreciated by persons skilled in the art that the recess area could be of the same or substantially the same height/depth with respect to the walls 30 and top edge 32 of the screw apertures 20.
Figure 3 show the walls 30 of first surface 16 defining the screw apertures 20 can be provided at an acute angle with respect to the remaining recessed area 28. A top edge 32 of the wall 30 defining the opening of the screw aperture 20 can be flat or planar as shown in figure 3. However, referring to figures 4a and 4b, the top edge 32 of walls 30 can be rounded or convex in form, or can be stepped or non-planar in form respectively.
Figure 5 shows a lid 24 attached to top surface 16 of filter body 102. More particularly, it can be seen than the lid 24 only contacts the top edge 32 of screw apertures 20. Screws 34 are located through an aperture in lid 24 and into a screw aperture 20 in the filter body in use. In addition, tuning screws 104 are located through the lid 24 and protrude inwardly of the filter body interior, and preferably into one or more of the resonant cavities within the filter body. The gap 26 formed between the lower surface of the lid 24 and the upper surface of the recessed area 28 is typically equal or substantially equal to the height of the screw wall 30. This gap allows washing fluid to flow into and drain from the filter body during a washing process, such that the lid 24 does not have to be removed in order for the filter body to be washed. The gap is typically open at the peripheral edge of the lid to allow wash fluid to enter and/or leave the interior of the assembled filter apparatus via the same.
Both the insertion of screws 34 and tuning screws 104 through the lid of the filter apparatus can generate dirt and debris within the interior of the filter apparatus, in addition to dirt and debris which may be present or fall into the interior of the filter apparatus during assembly. The washing and/or cleaning process of the present invention allows any dirt and debris to be removed and/or the interior of the filter apparatus to be cleaned without removing the lid of the apparatus from the filter body.
Claims (31)
1. A method of assembling and/or washing filter apparatus, said filter apparatus including a body portion having at least one resonant cavity with resonating means located therein or associated therewith when the apparatus is assembled, said at least one resonant cavity having an opening defined in a first surface of the body portion, and wherein one or more parts of the first surface have one or more raised or outwardly protruding members or sections defined thereon, said method including the step of engaging a lid member with the one or more raised or outwardly protruding members or sections such that at least one gap is defined between an inwardly facing surface of the lid and an area of the first surface of the body portion which is recessed relative to the one or more raised or outwardly protruding members or sections on said first surface, characterised in that with the lid member engaged to the body portion, said method includes the step of washing and/or cleaning the filter apparatus in a wash and/or cleaning fluid, and subsequently draining and/or removing the wash and/or cleaning fluid from the filter apparatus via the at least one gap defined between the lid member and the recessed area of the first surface of the body portion.
2. The method of claim 1 wherein the wash and/or cleaning fluid is a liquid.
3. The method of claim 1 wherein the wash and/or cleaning fluid is a gas.
4. The method of claim 1 wherein the wash and/or cleaning fluid includes or consists of a liquid and a gas.
5. The method of claim 1 wherein the wash and/or cleaning fluid enters and leaves the filter apparatus via the at least one gap.
6. The method of claim 1 wherein the at least one gap is defined between a peripheral edge of the lid member and one or more edges of the body portion and/or a relatively recessed area of the first surface.
7. The method of claim 1 wherein the gap or gaps are defined between two or more peripheral edges of the lid member and one or more edges of the body portion and/or a relatively recessed area of the first surface.
8. The method of claim 1 wherein the gap or gaps are defined around the entire or substantially entire peripheral edges of the lid member
9. The method of claim 1 wherein the lid member is engaged with the one or more raised or outwardly protruding members or sections so as to cover or substantially cover the at least one resonant cavity opening in use.
10. The method of claim 1 wherein the lid member only contacts the one or more raised or outwardly protruding members or sections on the first surface and does not contact the relatively recessed area or areas of the first surface.
11. The method of claim 1 wherein attachment means are used to engage the lid member with the one or more raised or outwardly protruding members or sections on the first surface.
12. The method of claim 11 wherein the attachment means are provided on, defined in and/or are associated with the one or more raised or outwardly protruding members or sections on the first surface.
13. The method of claim 11 wherein the attachment means include any or any combination of one or more apertures, screw apertures, screws, nuts and bolts, clips, adhesive, soldering or welding.
14. The method of claim 1 wherein the one or more raised or outwardly protruding members or sections on the first surface are provided with one or more screw apertures defined in the same for allowing the lid member to be engaged with the same in use.
15. The method of claim 1 wherein the one or more raised or outwardly protruding members or sections are provided at or adjacent one or more edges of the first surface defining the opening of the at least one resonant cavity.
16. The method of claim 1 wherein the one or more recessed areas of the first surface are separate to, independent of and/or are not the surfaces defining one or more interior surfaces of the at least one resonant cavity.
17. The method of claim 1 wherein two or more lid members are engaged with the one or more raised or outwardly protruding members or sections on the first surface.
18. The method of claim 1 wherein the inwardly facing surface of the lid member is formed from and/or includes an electrically conductive material, coating and/or layer, or a printed circuit board (PCB).
19. The method of claim 1 wherein the one or more relatively recessed areas of the first surface of the body portion is planar, flat, substantially planar or substantially flat.
20. The method of claim 1 wherein the relatively recessed areas of the first surface of the body portion are recessed with respect to the same or substantially the same depth, degree, height and/or distance.
21. The method of claim 1 wherein the relatively recessed areas of the first surface of the body portion have two or more sections that are at different heights, degrees, depths and/or distances.
22. The method of claim 1 wherein the one or more raised or outwardly protruding members or sections protrude relative to the relatively recessed areas perpendicularly, substantially perpendicularly, have a narrowing or diverging taper, and/or are at an acute angle.
23. The method of claim 1 wherein a top edge of a wall defining the one or more raised or outwardly protruding members or sections is flat, planar, substantially flat, substantially planar, rounded, curved, convexed or stepped.
24. The method of claim 1 wherein the filter body is formed from, includes or is provided with one or more electrically conductive materials, coatings and/or layers.
25. The method of claims 13 or 14 wherein the one or more screw apertures are blind apertures made in the filter body with an opening in the first surface.
26. The method of claims 13, 14 or 25 wherein one or more interior walls defining the screw apertures are threaded.
27. The method of claim 1 wherein a plurality of screw apertures or attachment means are provided in one raised or outwardly protruding member or section on the first surface.
28. The method of claim 1 wherein a single screw aperture or attachment means is provided in one raised or outwardly protruding member or section on the first surface.
29. The method of claim 1 wherein the one or more raised or outwardly protruding members or sections of the first surface is a single continuous member.
30. The method of claim 1 wherein the one or more raised or outwardly protruding members or sections of the first surface include two or more non-continuous members.
31. Filter apparatus, said filter apparatus including a body portion having at least one resonant cavity with resonating means located therein, said at least one resonant cavity having an opening defined in a first surface of the body portion, and wherein one or more parts of the first surface has one or more raised or outwardly protruding members or sections defined thereon, a Hd member is engaged with the one or more raised or outwardly protmding members or sections such that at least one gap is defined between an inwardly facing the surface of the lid member and an area of the first surface of the body portion that is recessed relative to the one or more raised or outwardly protruding members or sections on the first surface, and wherein said at least one gap is of such size, shape, design and/or dimensions to allow wash and/or cleaning fluid to be inserted or pass therethrough in use to ahow washing of the interior of the filter body in use when the Hd is assembled on the filter body, and to allow draining and/or removal of the wash and/or cleaning fluid from filter body with the lid assembled on the filter body.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1602521.5A GB201602521D0 (en) | 2016-02-12 | 2016-02-12 | Filter apparatus and method of use thereof |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201702211D0 GB201702211D0 (en) | 2017-03-29 |
| GB2548474A true GB2548474A (en) | 2017-09-20 |
| GB2548474B GB2548474B (en) | 2021-09-15 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1602521.5A Ceased GB201602521D0 (en) | 2016-02-12 | 2016-02-12 | Filter apparatus and method of use thereof |
| GB1702211.2A Active GB2548474B (en) | 2016-02-12 | 2017-02-10 | Filter apparatus and a method of assembling and/or washing the same |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1602521.5A Ceased GB201602521D0 (en) | 2016-02-12 | 2016-02-12 | Filter apparatus and method of use thereof |
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| GB (2) | GB201602521D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963399A (en) * | 2018-06-26 | 2018-12-07 | 浙江大学 | A kind of novel tunable high power cavity body filter |
| EP3660977A1 (en) * | 2018-11-30 | 2020-06-03 | Nokia Solutions and Networks Oy | Resonator for radio frequency signals |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079132A (en) * | 2020-08-20 | 2022-02-22 | 大富科技(安徽)股份有限公司 | Cavity filter and cleaning method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120049982A1 (en) * | 2009-03-18 | 2012-03-01 | Ace Technologies Corporation | Tuning bolt ground connection structure and rf cavity filter including same |
| WO2016076554A1 (en) * | 2014-11-10 | 2016-05-19 | 주식회사 케이엠더블유 | Radio frequency filter and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014007927A1 (en) * | 2014-05-27 | 2015-12-03 | Kathrein-Werke Kg | High frequency-tight housing, in particular high-frequency-proof filter housing |
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- 2016-02-12 GB GBGB1602521.5A patent/GB201602521D0/en not_active Ceased
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- 2017-02-10 GB GB1702211.2A patent/GB2548474B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120049982A1 (en) * | 2009-03-18 | 2012-03-01 | Ace Technologies Corporation | Tuning bolt ground connection structure and rf cavity filter including same |
| WO2016076554A1 (en) * | 2014-11-10 | 2016-05-19 | 주식회사 케이엠더블유 | Radio frequency filter and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963399A (en) * | 2018-06-26 | 2018-12-07 | 浙江大学 | A kind of novel tunable high power cavity body filter |
| CN108963399B (en) * | 2018-06-26 | 2019-12-24 | 浙江大学 | Novel tunable high-power cavity filter |
| EP3660977A1 (en) * | 2018-11-30 | 2020-06-03 | Nokia Solutions and Networks Oy | Resonator for radio frequency signals |
| US11121445B2 (en) | 2018-11-30 | 2021-09-14 | Nokia Solutions And Networks Oy | Resonator for radio frequency signals |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2548474B (en) | 2021-09-15 |
| GB201602521D0 (en) | 2016-03-30 |
| GB201702211D0 (en) | 2017-03-29 |
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