DE1015873B - By means of a short-circuit device, tunable line arrangement for very short waves - Google Patents

Description

The invention relates to a tunable by means of a galvanically or capacitively acting short-circuit device Line arrangement for meter, decimeter and centimeter waves, especially a tunable one Resonator whose characteristic impedance is along the line arrangement at least at one point changes abruptly and / or in a steady transition.

Should voting circles of z. B. designed coaxial design tunable in a large frequency range it is necessary that the length of a line can be adjusted over a wide range. For Frequencies below z. B. 0.5 GHz, the resonators or tunable lines already have such unwieldy dimensions that they are very annoying. The geometric dimensions of such structures namely should be small in order to be able to accommodate them in existing boxes or structural units. The use of concentrated switching elements is mostly because of the high. Losses no longer permitted. Since the possibility of voting should be retained, the line cannot be better known Way to fill with dielectric material. To overcome this problem it is known to use a tunable resonance circuit for very short waves, consisting of a fixed outer wall and a insertable inner conductor consists of designing the outer wall so that the clear width of the outer conductor funnel-shaped from the short-circuit connection between the inner and outer conductors as the largest width rejuvenates. The tuning of the resonance frequency is done by the movable inner conductor, while the coupling and decoupling of the energy takes place via special coupling elements. This embodiment is, however, often undesirable in spatial relation, since it is one of the open end of the line Has adjacent outer conductor section, which is practically not used as a line.

The invention is based on the object of providing a tunable line arrangement as described in the introduction Kind that z. B. as a tunable resonator in microwave generators or amplifiers, Frequency meters, filters or the like. Can be used to improve their overall length becomes relatively short despite the large tuning range or, if an expansion of the tuning range is desired is to design the tunable line so that its geometric length is significantly greater than their electrical length becomes. The line arrangement is to be short-circuited by means of a short-circuit slide and be matched.

According to the invention, this object is achieved in that different line sections Characteristic impedance lines having an outer jacket are provided and that these lines By means of a short circuit device

tunable line arrangement

for very short waves

Applicant:
Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Dipl.-Ing. Hans-Günther KoIb, Munich,

and Dr. rer. nat. Viktor Pfirrmann, Haßloch (Palatinate),

have been named as inventors

and / or the short-circuit device are designed so that a displacement of the short-circuit device is possible across the sections of the wave resistance change.

It is known per se to form a so-called "strip line" that can be tuned in such a way that you Characteristic impedance along the line changes continuously or abruptly. There is, however neither given the problem that arises when there is an outer-sheathed line, nor the solution there is transferable to such a line.

It has also already been proposed to use a short-circuit device that acts galvanically tunable line arrangement, the wave resistance of which is along the line arrangement at a Place changes by leaps and bounds, so build up that the line sections have different wave resistance lines having an outer sheath are provided. There, however, are neither the management nor the Short-circuit device designed according to the invention.

In the simplest way, a line that can be tuned in this way can be made up of two lines joined together produce different wave resistance. Assuming that the line is short-circuited at the end, you can shorten or lengthen it the overall length of the tunable line used as a resonator, depending on whether one on the side of the short-circuited part the line section with higher or lower characteristic impedance used. Practically any frequency response can be achieved through suitable dimensioning

70Ϊ 697/291)

Claims (5)

3 4 achieve the vote. The dimensioning section 4 can also be selected so that the outer conductor dimensions are increased for a given Re. A cross section through the line sonator length of a very large resonance frequency changing section 4 is shown in FIG. This persistence is achieved. In order to be able to coordinate the line arrangement through the outer conductor 8 and the common inner one and the same short-circuit piston or short conductor 5. In the corners of the outer conductor of this circuit-breaker, metal pieces 9 are still installed in the line section, the line section with larger transverse dimensions. The structure shown here for an arrangement according to sungen inserts before which the leadership for the invention offers the great advantage that small short-circuit slide take over. These inserts short-circuit piston along the entire length of the Rewerden appropriately designed and arranged, io sonators, so both within the line that they can be moved in connection with the short-circuit slide section 4 as well as within the line actually a short circuit at a defined section 6, so that the Place of the resonator or the line arrangement be the resonator act in an extremely large wave range. Through a special training of the short-voting can be. The corner pieces 9 are namely the final slide can also be achieved that this 15 is designed and arranged in such a way that it can move away the guide surface formed by the outer wall 6 of the resonator despite the change in the distance between the outer and inner conductors in the line section 4 with a large wave resistance, z. B. when you put the short-circuit slide. A short-circuit element 10 can therefore be made of resilient material without. Interruption point along the entire extension The invention will be displaced below with reference to FIG. 20 of the resonator. Advantageous exemplary embodiments explained in more detail. In FIG. 1, the basic circuit diagram of a line piston can be used, which then itself shows an elastic arrangement according to the invention. They have he properties and an excellent and is available from the line section 1 with the higher secure contact between the short- _{circuited characteristic impedance Z 1} and the over an abrupt 25 line parts enable. In the Ausführungsbei-transition connected line section 2 with game four short-circuit tubes 10 are used, the lower characteristic impedance Z ₂ . A capacitor 3 is arranged and mechanically connected to one another as a load, preferably in the same cross-sectional plane of the resonance circuit. B. the tube capacity of a so that they can be moved together. The tube 30 connected to the resonator at this point is intended to replace the effect of this so-called short circuit. It can be proven mathematically that the tube is based on the fact that through it the line gives a certain length for the line section 1 system of the resonator into several waveguides or for the line section 2, for which the sections of sufficiently small cut-off wavelength total length at the lowest point of interest Is split open and therefore the line system is in sequence a minimum. 35 this level is short-circuited. These tubes - The ratio Z ₁ ZZ _{2 of} the wave resistances of the pistons thus give between the cylindrical inner butting line sections up to conductor and the non-cylindrical outer conductor galdem Wert3 and above without any special Schwievanian contact. It is always possible for the deviations to be realized. to choose measurements of the tubes so that in Ab-Fig. 2 shows a basic circuit diagram of a line 40 tuning of the resonator to very high frequencies arrangement in which, depending on the location of the wave, the operating wavelength does not steadily approach the limit resistance, e.g. B. falls in an exponential wavelength of the tubes. It will be so, it will change. The arrangement is avoided at the end of the line so that the attenuation of the end cap consisting of several high wave impedances and short-circuited on the tube drops at very high open ends with a load capacity of 3 frequencies. Of course, the one between should also be closed. With this arrangement, too, it is possible for the corner pieces 9, which remain free and are delimited by the small tubes, to achieve a piston that is shorter than the electrical lengths and so small transverse dimensions overall length. The wave resistance of the line arrangement formed like the short-circuit tube has a blocking effect. load point the value Z ₂ ; this value rises steadily. B. processing section with large wave impedance at the open exponential, and has at the 'short-circuited NEN end, line section with low wave end the value Z ₁ . resistance at the short-circuited end - you can In Fig. 3, a practical embodiment of an extension or expansion of the tuning path for an arrangement according to the invention is shown. The 55 reach, which in certain applications he arrangement consists of the line part 4 with one may be desired. In addition, through the appropriately rounded inner conductor 5 and the line part 6, the round inner conductor 5 is continued to a certain extent in the wave resistance curve. The wave range is a linear relationship between the series resistance of the line part 4 is much greater thrust of the short-circuit slide and the resonance range that of the line part 6. The transition 60 achieve quenzy. between the two parts of the line takes place in leaps and bounds. Particular importance in the arrangement according to the The outer wall of the line arrangement has the invention have the square made of elastic material Cross-section, as shown in FIGS. 4 and 5 standing short-circuit piston, z. B. those made of spring steel is shown. manufactured tubular flasks, since it is possible with them. In FIG processing section of smaller cross-section and 5 that the distance between the conductors is not constant. common inner conductor. To create a low wave resistance are between the claims; Outer and the inner conductor webs 7 attached. 1. By means of a galvanically or capacitively Generation of the high wave resistance in the routing 70 kenden short-circuit device, tunable line arrangement for meter, decimeter and centimeter waves, in particular a tunable resonator, whose wave resistance varies by leaps and bounds along the line arrangement at least at one point and / or changes in a steady transition, characterized in that different line sections Characteristic impedance lines having an outer jacket are provided, and that these lines and / or the short-circuit device are designed so that a displacement of the short-circuit device over the sections of the Wave resistance change away is possible. 2. Arrangement according to claim 1, characterized in that larger in the line section Ouer dimensions inserts for guiding the short-circuit device are provided. 3. Arrangement according to claim 1 or 2, characterized in that one of two joined together Lines of different wave resistance existing line arrangement in the Line of low wave resistance of the guide of the short-circuit device serving parts are continued into the interior of the line of higher wave resistance. 4. Arrangement according to one of claims 1 to 3, characterized in that the short-circuit devices consist of resilient material. 5. Arrangement according to one of claims 1 to 4, characterized in that as a short-circuit device several tubular structures are provided. Considered publications:
German Patent No. 873,415;
U.S. Patent No. 2,715,211. Cited earlier rights:
German Patent No. 950 132. 1 sheet of drawings © 709 65-7 / 290 9.