Tuners – With resonant line elements – With lumped capacitor in tuned circuit
Patent
1996-04-29
1998-07-14
Gensler, Paul
Tuners
With resonant line elements
With lumped capacitor in tuned circuit
333185, 333235, 334 71, 336200, H03H 100
Patent
active
057810885
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a lumped-constant resonator construction comprising at least one, preferably ceramic substrate, at least one capacitance means, and at least one inductance means, said capacitance means and said inductance means being clearly locatable separately but operatively connected, said inductance means comprising a conductive coating.
The invention also relates to a method for adjusting a lumped-constant resonator construction, said method comprising altering the characteristics of one or more resonant circuits formed by one or more capacitance means and inductance means provided on one or more substrates, said capacitance means and inductance means of the resonator construction being clearly locatable separately but operatively connected, said inductance means comprising a conductive coating.
Resonator constructions are used for implementing high-frequency circuits for instance in mobile phones and their base stations. Resonators can be used, for example, as interface and filtering circuits in the output stages of amplifiers of mobile phones. If the resonator construction comprises several capacitance and inductance means, the resonant circuits are coupled to one another in such a manner that the resonator construction provides the desired frequency response in the frequency band.
The term lumped-constant resonator structure means that a capacitance means and an inductance means can be clearly located in a resonant circuit. Thus the lumped-constant resonator structure differs from other resonator types, such as coaxial resonators and micro-strip resonators, from which it is not possible to locate separate capacitance and inductance means. A lumped-constant resonator forms an LC oscillating circuit.
Lumped-constant resonators can be mounted, for instance, on a ceramic substrate, or base plate. Both a capacitance means and an inductance means are provided on the substrate. The capacitance means, i.e. in practice the capacitor, usually consists of electrodes provided on opposite sides of the substrate, and a substrate medium between them, such as zirconium-tin-titanate, the dielectric constant of which is high, i.e, about 36. In known lumped-constant resonators, the inductance means, in turn, has been implemented in a conventional way, i.e. with a wound coil. During the manufacture of resonators or apparatuses comprising resonators, and in the use of such apparatuses, resonators are often subjected to severe temperature conditions, for instance during soldering or rapid changes in the ambient conditions. A metallic thin-wired coil expands during heating, as a result of which the resonance frequency determined by the resonator construction drifts downwards. A significant further drawback in constructions with a wound coil is the possible rupture of the ceramic-metal-type joint between the ceramic substrate plate and the coil, since, as a result of temperature changes, the metallic coil expands, whereas the ceramic substrate does not. In the known solutions, the coil is secured to an electrode provided on the substrate in a conventional way, for example by tin solder. The soldering as such is a separate operation, and in addition, the solder must be purified by washing from the fluxes contained in the soldering tin. A significant problem with wound coils is the manufacture of particularly small coils, in which the laps of the coil should be precisely identical. Mounting of the coils on the base plate, or substrate, is an operation which also calls for particular accuracy.
Adjustment of a lumped-constant resonator is sometimes also problematic. If the resonance frequency of a circuit is to be adjusted in known lumped-constant resonators by adjusting the inductance, the winding of the coil must usually be changed; this is a difficult operation, which often requires that the entire coil be changed as long as it is economically sensible. In a construction comprising several resonant circuits, such as a filter, adjacent resonant circuits are connected to each other, i.e
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Jantunen Heli
Turunen Aimo
ADC Solitra Oy
Gensler Paul
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