JPS58194404A - Band pass filter - Google Patents

Abstract

PURPOSE:To enable the control of frequency and at the same time to attain a low cost and miniaturization of a BPF, by providing a metallic plate for control of frequency at the side of an open terminal of a coaxial dielectric material. CONSTITUTION:A metallic plate 20 for control of frequency is formed in series to a coaxial dielectric material 9 and a fixed conductor 7 and set vertically to the bottom plate of a housing 5 which holds fixedly the material 9 to have a conduction to the housing 5. The capacity between the conductor 7 and the plate 20 by controlling the space between them. Then the resonance frequency is controlled for each resonator. In such a way, the plate 20 is set in series to the conductor 7 which fixes the material 9 to facilitate the control the frequency. At the same time, a low cost and miniaturization are possible for a BPF.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency band mud wave generator composed of a coaxial resonator including a plurality of dielectric materials, and is applicable to VHF, 0A
It can be applied to band pass filters such as double-mixing wideband receivers that receive TV and UHF band (7) fL/HiSHIA7 signals.

A conventionally commonly used band F wave device will be explained using FIGS. 1(a), 1+, and 1(c). for example,
Here, a band P-wave device composed of three stages of resonators will be explained. FIG. 1 ifa+ is a plan view of a conventional two-band wave generator.

In FIG. 1, 1 and 2 are input and output connectors, and conventionally, 60Ω coaxial connectors called 08M and TSSM connectors have been used. These connectors are very expensive and, due to their large size, require considerable space during connection.

3 is a tuning screw fixing jig machined to a fine pitch of, for example, 0.25 mm, and the tuning screw fixing jig is
It is fixed to the upper side of the corrugator housing 6. 4 is a nut for fixing the L-two screw. Reference numeral 6 is a tuning screw machined with a fine pinch, and by rotating it clockwise or counterclockwise, the distance between the coaxial dielectric and the coaxial dielectric is determined, the capacitance is changed, and the resonant frequency is adjusted. Tuning screw fixing jig 3. The tuning screw is constituted by a combination of tuning screws 6 machined with 4 fine pitch nuts for fixing the tuning screw. Here, three stages of resonators and three
Tuning screws are used.

In this way, the conventionally used tuning screw has a tuning screw 6 machined with a fine pitch of 0.25 mm, a tuning screw fixing jig 3. Since the tuning screw fixing nut 4 is used, the tuning screw becomes very expensive, and there is a disadvantage that it is impossible to reduce the price and it cannot be used in consumer equipment. Furthermore, due to the limited dimensions, there is a problem that miniaturization and economicalization cannot be realized. 5 shows the casing of the band-pass transducer with the lid removed. A fixed conductor 7 fixes the coaxial dielectric 9 and is electrically connected to the band wave generator housing 6, and is fixed to the band wave wave generator housing 6 using conductive paste, screw-in type, etc. It is something that will be done. Reference numeral 8 denotes a dielectric coupling board that determines the input/output and inter-stage coupling of the band F wave device, and the input/output and interstage coupling are performed by interdigital and gap capacitive coupling constructed on the dielectric substrate 8. Reference numerals 11 and 12 are connecting terminals of the input/output connector 1°2, respectively, which are connected to the input/output ends of the dielectric bonding board 8. Generally, adhesive conductive paste is used for soldering. .

Reference numeral 9 denotes a cylindrical coaxial dielectric body, which is fixedly and conductively bonded to the band modulator housing 5 through a fixed conductor 7. Fig. 1 To) shows a plan view when the lid for the band ν wave device is attached 1° to Fig. ia1. FIG. 1(c) is a front view of a lid 1o for a P-wave device, and the lid 1o is shielded to the housing 5 by soldering, conductive paste, screws, etc.

As described above, the conventional configuration of the band P-wave device shown in FIG. 1 has the following drawbacks.

(1) Fixing 11 jigs that make up the tuning screw 3. Fixing nut 4. Since the tuning screw 6 is machined with a fine pitch of 0.25 mm, it becomes a very expensive tuning screw and cannot be reduced in price.

(2) Since the tuning screw is expensive, it cannot be used in consumer equipment.

(3) Since this tuning screw has limited dimensions, it cannot be made smaller and more economical.

The present invention eliminates the expensive fine pitch tuning screw conventionally used, and at the same time
By adopting a metal plate for frequency adjustment on the open end side of the coaxial dielectric, we aim to improve the conventional drawbacks and at the same time provide a band P wave generator that aims to achieve lower cost and smaller size. It is something to do. Furthermore, it is an object of the present invention to provide a compact and economical band transducer structure that can be adopted in consumer equipment.

Next, one embodiment of the present invention will be described in detail using FIGS. 2+U, (b) and FIG. 3. The same reference numerals are given to parts having the same functions as those of the conventional example, and the details are omitted.

Fig. 2 (Al is a plan view of the metal plate for frequency adjustment of the present invention configured into a band wave generator housing, and Fig. 2 mountain) is a plan view of the metal plate for frequency adjustment of the present invention configured into a band wave generator housing. FIG. 3 is a plan view of a case in which a lid with a frequency adjustment hole is arranged on the housing, and FIG. It shows.

In FIGS. 2(a) and (bl, 20 is a metal plate for frequency adjustment configured in series with the coaxial dielectric 9° fixed conductor 7, and the casing 6 which holds and fixes the coaxial dielectric 9. It is arranged perpendicularly to the bottom plate (the specific structure and installation will be described later) and is electrically connected to the housing 6. By adjusting the distance between the fixed conductor and the metal plate 2o,
The capacitance between the fixed conductor 7 and the metal plate 20 is changed to adjust the resonance frequency of each resonator. In this way, in this embodiment, the metal plate 20 for frequency adjustment is arranged in series with the fixed conductor 7 to which the coaxial dielectric 9 is fixed, as shown in the (&) diagram, so that it can be easily adjusted. This has the advantage that it is possible to adjust the frequency, and at the same time, it is possible to reduce the price.

FIG. 2(b) is a plan view of the lid 1o in which the frequency adjustment hole 21 is provided in the fa1 diagram, and the lid 1o is shielded by soldering, conductive paste, screwing, etc. It is something that 21 is a metal plate 20 for frequency adjustment
This is a frequency adjustment hole for adjusting the distance between the fixed conductor 7 and the fixed conductor 7 using a jig such as non-conductive tweezers. In this way, by adjusting the interval between the frequency adjustment hole 21 and the metal plate 2o to set the resonant frequency, it is possible to easily adjust the frequency, and at the same time, it is possible to adjust the frequency at a low cost without using a tuning screw. , it has the advantage of realizing a band waver that can be made smaller.

FIG. 3 is an example of a structural diagram of a specific embodiment of the frequency adjustment means 22 of the band offshore transducer of the present invention, (a) is a plan view;
fbl is a front view, and (C) is a side view. 20 is a metal plate, 23 is a holding part, and 24 is a fixing collar for fixing to the band offshore wave device housing 6. The metal plate 20 is preferably made of elastic material such as phosphorescent copper, and has a thickness of 0.1 to 3 mm depending on the purpose. The holding portion 23 and the fixing collar 24 are also integrally formed of the same material.

Also, the installation of the frequency adjustment means 22 to the housing 5 is shown in FIG.
)) The bottom surface of the metal plate 2o shown in FIG. 2 (2L) is installed so as to face the surface of the fixed conductor 70 shown in FIG.
Glue it to the housing 6 in step 4. The fixing buckle 24 is bonded to the casing by conductive bonding by soldering, conductive paste, or the like. At this time, the metal plate 20 and the frequency adjustment hole 21 shown in FIG. 2(b) are provided with the same pin, and the frequency adjustment is performed by using a jig such as Vincent from the frequency adjustment hole 21. This is done by adjusting the distance between the bottom surface of the metal plate 2o and the surface of the fixed conductor 7.

In this way, by forming the frequency adjustment means 22 into a structure as shown in FIG. 3, it becomes an integrated structure, which has the advantage of being an inexpensive metal plate for frequency adjustment.

In this way, this embodiment has a configuration in which the frequency adjustment means 22 is arranged in series with the fixed conductor 7 that fixedly holds the coaxial dielectric 9, thereby eliminating the need for expensive Since the tuning screw can be removed, the present invention has the advantage of being able to realize a small-sized bandpass filter that can be easily adjusted in frequency at a low cost. Furthermore, the above-described bandpass transducer has the advantage that the interval between the metal plates can be easily adjusted through the frequency adjustment hole 21.

Furthermore, by using the frequency adjustment means 22 having such a structure and configuration, it has the advantage of being able to be made lower in price and smaller in size, so it has the advantage of being applicable to consumer equipment.

As described above, the present invention provides a band-pass wave transducer in which a plurality of coaxial dielectric resonators are arranged and arranged in a housing, and the frequency adjustment means made of a metal plate is provided on the open end side of the coaxial dielectric resonator. This has the advantage that it is possible to easily adjust the frequency without using an expensive fine-pitch tuning screw, and at the same time, it can be made compact at a low cost. Further, since it is possible to form the frequency adjustment metal plate into an integrated structure, it is possible to realize a low-cost band offshore wave device.

[Brief explanation of the drawing]

Figure 1 [a] is a plan view of a conventional band offshore wave device, 1) 1
2 is a plan view of the band Pe device shown in ta+ with a lid on, (C) is a front view of the lid, FIG. ) is K) Plan view of the state with the enclosure, Figure 3ial, (b),
fc) is a plan view, a front view, and a side view showing an example of the structure of the frequency adjustment means of the F band F-wave device according to the present invention. 1...Input terminal, 2...Output terminal, 3
...Tuning screw fixing jig, 4...
...Tuning screw fixing nut, 6...
・・Bandwidth Wire device housing, 6・・Tuning screw, 7・・Fixed conductor, 8・・Dielectric coupling board, 9・・Coaxial dielectric, 11・... Input connector connection terminal, 12 ... Output connector connection terminal, 10 ... Lid for band E wave device 17, 20 ...
...Metal plate for frequency adjustment, 21.. Hole for frequency adjustment, 22.. Frequency adjustment means, 23.. Holding part, 24.. Fixing buckle. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure (C'l ” Figure 2 Figure 3 (various) 424

Claims (2)

[Claims] (1) A box has a plurality of coaxial dielectric resonators arranged in an array, and independent metal plates are provided opposite each open end of each of the coaxial dielectric resonators and separated from each other by a certain distance. 2. A band mud wave device, characterized in that a part of the metal plates are combined with each other to form an integral structure to constitute a frequency adjustment means, and the frequency adjustment means is electrically coupled to a housing. (2) A patent claim characterized in that the distance between the metal plate and the open end of the coaxial dielectric resonator is configured to be adjustable through a hole provided in the lid of the casing. Range 1
Bandwidth wave device described in section.