Adjustable multiband antenna and methods
First Claim
1. An adjustable antenna having at least a lower and an upper operating band and comprising:
- a ground plane;
a radiating plane; and
an adjusting circuit configured to displace at least one of said lower and upper operating bands, said adjusting circuit comprising;
an LC circuit with an input coupled to the radiating plane;
a switch with its fixed end coupled to an output of the LC circuit; and
at least two tuning lines, the first of which is coupled to a first output pole of the switch and the second of said tuning lines coupled to a second output pole of the switch.
3 Assignments
0 Petitions
Accused Products
Abstract
An adjustable multi-band planar antenna especially applicable in mobile terminals and a radio device. The adjusting circuit (430) of the antenna is galvanically connected to a point (X) of the radiator, where the circuit can affect the places of at least two operating bands. The adjusting circuit comprises a multi-pole switch (433), by which said radiator point can be connected to one of alternative transmission lines. For example, one of two transmission lines (434, 435) is open and another shorted. A discrete capacitor (C2) can be located between the separate conductor of the transmission line and an output pole of the switch as an additive-tuning element. The adjusting circuit further comprises a LC circuit (432) between the radiator (320) and the switch. Among other things, the lengths of the transmission lines, the values of the discrete components and the distance between the antenna short-circuit point (G) and the adjusting circuit connecting point (X) are then variables from the point of view of the antenna adjusting. Such values are calculated for these variables that each of the antenna operation bands separately shifts to a desired other place when the switch state is changed. The space required for the adjusting circuit is relatively small, and a relatively high efficiency is achieved for the antenna despite of the use of a switch.
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Citations
39 Claims
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1. An adjustable antenna having at least a lower and an upper operating band and comprising:
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a ground plane; a radiating plane; and an adjusting circuit configured to displace at least one of said lower and upper operating bands, said adjusting circuit comprising; an LC circuit with an input coupled to the radiating plane; a switch with its fixed end coupled to an output of the LC circuit; and at least two tuning lines, the first of which is coupled to a first output pole of the switch and the second of said tuning lines coupled to a second output pole of the switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An adjustable antenna having at least a lower and an upper operating band and comprising:
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a ground plane; a radiating plane; and an adjusting circuit to displace at least one operating band of the antenna; wherein said radiating plane comprises a feeding point, a grounding point, an adjusting point of the antenna and two radiating parts having different electric lengths so as to implement said lower and upper operating bands; wherein said adjusting circuit comprises an LC circuit with its input galvanically coupled to the radiating plane at said adjusting point, a switch with its common pole connected to an output of the LC circuit, and at least two tuning lines; and wherein the electric distance in the radiating plane between the grounding point and the adjusting point is arranged for desired displacements of the operating bands, and the length of said tuning lines is at the most a fifth of the wavelength corresponding to the highest utilization frequency of the antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An adjustable antenna, comprising:
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at least a lower and an upper operating band; a ground plane; a radiating plane; and an adjusting circuit to displace at least one operating band of the antenna, said radiating plane comprising a feeding point, a grounding point, an adjusting point of the antenna and two radiating parts having different electric length to implement said lower and upper operating bands; wherein said adjusting circuit comprises an LC circuit with its input coupled to the radiating plane at said adjusting point, a switch with its common pole electrically coupled to the output of the LC circuit, and at least two tuning lines, the first of which is coupled at its head end to a first output pole of the switch and the second of which tuning lines is coupled at its head end to a second output pole of the switch to arrange alternative impedances between the adjusting point and ground and thus to displace the operating bands of the antenna; and wherein the electric distance in the radiating plane between the grounding point and the adjusting point is arranged for desired displacements of the operating bands, and the length of said tuning lines is at the most a fifth of the wavelength corresponding to the highest utilization frequency of the antenna. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A radio device, comprising:
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a radio transceiver circuit; and an adjustable multiband antenna having at least a lower and an upper operating band, said antenna comprising; a ground plane; a radiating plane; and an adjusting circuit configured to displace at least one of said lower and upper operating bands; wherein said adjusting circuit comprises; an inductive-capacitive (LC) circuit with an input coupled to the radiating plane; a switch with its fixed end coupled to an output of the LC circuit; and at least two tuning lines, the first of which is coupled to a first output pole of the switch and the second of said tuning lines coupled to a second output pole of the switch. - View Dependent Claims (35, 36, 37, 38, 39)
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Specification