EP4165717A1 - Filtre haute fréquence à réglage électronique - Google Patents

Filtre haute fréquence à réglage électronique

Info

Publication number
EP4165717A1
EP4165717A1 EP21735861.3A EP21735861A EP4165717A1 EP 4165717 A1 EP4165717 A1 EP 4165717A1 EP 21735861 A EP21735861 A EP 21735861A EP 4165717 A1 EP4165717 A1 EP 4165717A1
Authority
EP
European Patent Office
Prior art keywords
electronically adjustable
filter
bandpass filter
resonance structure
stripline
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21735861.3A
Other languages
German (de)
English (en)
Inventor
Benedikt Thelen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP4165717A1 publication Critical patent/EP4165717A1/fr
Pending legal-status Critical Current

Links

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
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20381—Special shape resonators

Definitions

  • the present invention relates to an electronically adjustable high-frequency bandpass filter (HF bandpass filter), which has a resonance structure formed from a stripline with at least one perturbation, the stripline forming a closed square loop and an integrated component with electronic at each corner adjustable capacity is arranged.
  • HF bandpass filter electronically adjustable high-frequency bandpass filter
  • Electronically adjustable high-frequency band-pass filters are required in many areas of high-frequency technology, for example in radar technology. Such filters are used e.g. in the receiving channel of
  • bandpass filters Used in radar systems. These bandpass filters should have a small size, a low insertion loss and an amplitude variation that is as small as possible over the center frequency setting range.
  • High-frequency bandpass filters can be implemented by a resonance structure formed from a stripline, the dimensions of which are matched to the desired filter parameters.
  • an electronically adjustable HF filter is known, which has a resonance structure formed from a stripline with at least one perturbation for double-mode excitation.
  • the stripline forms a closed square loop, in the corners of which, in one embodiment, a varactor diode with an electronically adjustable capacitance is arranged.
  • the center frequency of the bandpass filter can be electronically adjusted between 1.5 and 1.62 GHz via these varactor diodes.
  • the object of the present invention is to provide an electronically adjustable RF bandpass filter which has a low insertion loss and an amplitude variation that is as small as possible over the center frequency setting range and which can be implemented with a small overall size.
  • the proposed RF bandpass filter has a resonance structure formed from a stripline with at least one perturbation, by means of which double-mode excitation is achieved.
  • the strip conductor forms a closed square loop with a rectangular indentation on each side, an integrated component with an electronically adjustable capacitance being arranged at an inner corner of each indentation.
  • Inner corners of the indentations are to be understood as the corners of the indentations which are in the inner region of the square loop, that is to say not on the sides of the square formed by the square loop.
  • This configuration forms an electronically adjustable HF bandpass filter which, on the one hand, due to the special shape of the resonance structure and, on the other hand, due to the arrangement of the integrated components with electronically adjustable capacitance at the inner corners of the
  • the HF filter can be implemented in a particularly space-saving manner.
  • the HF filter can be implemented with low insertion loss and has a very low one Amplitude variation over the center frequency adjustment range of the filter.
  • so-called PTICs passive tunable integrated circuits
  • capacitance diodes in these components it is not the distance d of the depletion zone but the permeativity s r that changes with the applied voltage, since a ferroelectric material, in particular barium-strontium-titanate, is used as the dielectric material.
  • the coupling-in and coupling-out from the resonance structure preferably take place in each case via a coupling structure made up of intersecting conductor track sections, one section of which runs parallel to one side and the other perpendicular to this side of the square loop.
  • the vertical section extends into the respective rectangular indentation in order to realize a double-sided coplanar coupling.
  • the dimensioning of the filter in particular the dimensions of the resonance structure or conductor tracks, as well as the choice of the suitable integrated components with electronically adjustable capacitance is carried out in an HF simulation program, over which the width of the conductor tracks, the outer dimensions of the square and the rectangular indentations are looped can be optimized for the desired parameters.
  • the HF filter can thus be dimensioned for different frequencies or frequency ranges.
  • the proposed HF bandpass filter can be used for all frequency-selective high-frequency applications, for example in radar systems in which an electronically adjustable center frequency of the bandpass filter is desired.
  • Fig. 1 is a plan view of an exemplary
  • FIG. 2 shows an enlarged illustration of the layout of the inner area of the filter from FIG. 1 without the PTICs.
  • Figure 1 shows a photo in plan view of the circuit board 1, on which the HF-
  • the filter has a resonance structure formed by a strip conductor 2.
  • the strip conductor 2 forms a closed square loop with rectangular indentations on each side, as can be seen from FIG.
  • a perturbation 3 is formed, by means of which a double-mode excitation of the resonance structure is made possible, which leads to an enlarged pass bandwidth of the filter.
  • a PTIC 4 the capacitance of which is electronically adjustable, is arranged at an inner corner of each rectangular indentation. To set the capacity, each of these PTICs 4 is connected to a central via 9, via which a direct voltage can be applied to the PTICs 4.
  • the ground vias 8 to which the PTICs 4 are each connected can also be seen in FIG.
  • the PTICs 4 are arranged symmetrically in the resonance structure.
  • FIG. 1 also shows the adaptation network 6 for adapting the coupling structures 5 to the input or output line 7 with an impedance of 50 ohms.
  • FIG. 2 again shows a plan view of the inner area of the RF filter of FIG. 1 without the PTICs 4.
  • the contact surfaces or conductor tracks for the connection of the PTICs with the ground vias 8 and the via 9 for the direct voltage supply (DC) can be seen better.
  • the resonance structure of the filter shown in FIG. 1 can, for example, have a side length of approximately 30 mm.
  • the filter can thus be implemented in a very space-saving manner.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

La présente invention concerne un filtre HF à réglage électronique, comprenant une structure de résonance qui est formée par une ligne ruban (2) et qui présente au moins une perturbation (3). La ligne ruban (2) forme une boucle carrée fermée présentant un évidement rectangulaire de chaque côté. Un circuit intégré accordable passif (4) destiné au réglage électronique est disposé au niveau d'un coin interne de chaque évidement. Le filtre HF proposé peut être rendu compact, présente un faible affaiblissement d'insertion ainsi qu'une faible variation d'amplitude sur la plage de réglage de fréquences centrales.
EP21735861.3A 2020-06-15 2021-06-15 Filtre haute fréquence à réglage électronique Pending EP4165717A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020115690.1A DE102020115690A1 (de) 2020-06-15 2020-06-15 Elektronisch einstellbares Hochfrequenz-Filter
PCT/EP2021/066063 WO2021255004A1 (fr) 2020-06-15 2021-06-15 Filtre haute fréquence à réglage électronique

Publications (1)

Publication Number Publication Date
EP4165717A1 true EP4165717A1 (fr) 2023-04-19

Family

ID=76695696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21735861.3A Pending EP4165717A1 (fr) 2020-06-15 2021-06-15 Filtre haute fréquence à réglage électronique

Country Status (3)

Country Link
EP (1) EP4165717A1 (fr)
DE (1) DE102020115690A1 (fr)
WO (1) WO2021255004A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2467763B (en) 2009-02-13 2013-02-20 Univ Kent Canterbury Tuneable surface

Also Published As

Publication number Publication date
WO2021255004A1 (fr) 2021-12-23
DE102020115690A1 (de) 2021-12-16

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