KR102032457B1 - Wideband antenna apparatus - Google Patents

Abstract

Provided is a broadband antenna device. According to one embodiment of the present invention, the broadband antenna device comprises: a ground formed on a substrate; a feeding structure positioned on one side of the ground and forming a loop including feeding power supply; and a plurality of radiators connected to the feeding structure, wherein a plurality of antennas may be configured by the plurality of radiators.

Description

Broadband Antenna Unit {WIDEBAND ANTENNA APPARATUS}

The following embodiments relate to a wideband antenna device, and more particularly, to a wideband antenna device which combines two antennas having resonances in the same frequency band through a wideband feeding structure to implement a wideband impedance bandwidth.

The penetration rate of mobile terminals using wireless communication is growing rapidly, and it is classified as a technology to replace wired communication in the future. The types of products currently on the market are also very diverse, especially in the case of broadband wireless portable terminals using LTE, GSM, WCDMA, etc., consumer demand is increasing. However, there is not much technology to widen the antenna in the products using the broadband, so the number of products on the market is small and it is difficult to develop.

The antenna for the wireless terminal is located on a printed circuit board (PCB) and the antenna forms an electromagnetic coupling with the PCB to radiate electromagnetic energy from the PCB into the air. When the PCB is very small compared to the wavelength, the impedance bandwidth Narrowing occurs. The prior art has a problem of narrow bandwidth in a structure having a very small PCB compared to the wavelength.

Korean Patent Laid-Open Publication No. 10-2012-0068273 relates to such a wideband single resonant antenna, and describes a technology related to a single resonant antenna supporting wideband.

Korean Patent Publication No. 10-2012-0068273

Embodiments describe a broadband antenna device, and more specifically, provide a technique for implementing a broadband impedance bandwidth by combining two antennas having resonances in the same frequency band through a broadband feeding structure.

Embodiments of the present invention provide a wideband antenna device using a Planar Inverted-E (PIE) feeding structure and two or more radiators, and additionally arranging a lumped element in the PIE feeding structure to adjust the coupling between the radiators to expand the impedance bandwidth. To provide.

Broadband antenna device according to an embodiment, the ground formed on the substrate; A feeding structure positioned on one side of the ground and forming a loop including a feeding power supply; And a plurality of radiators connected to the feeding structure, and a plurality of antennas may be configured by the plurality of radiators.

The power supply structure may further include a series concentrator connected in series with the power supply and disposed between the plurality of radiators to adjust coupling between the plurality of radiators.

The power supply structure may further include a parallel concentrator connected in parallel with the power supply, and may have a resonance circuit including the power supply, the series concentrator, and the parallel concentrator.

Resonances of the plurality of radiators are coupled to each other by the series concentrator and the parallel concentrators of the feed structure, and the resonances of the plurality of coupled radiators are coupled simultaneously with Planar Inverted-E (PIE) resonances to provide additional impedance bandwidth. It can be secured.

Here, the power supply structure, the power supply unit is configured the power supply; A connection part formed in series with the power supply and configured to connect between the plurality of radiators and to have the series concentrator formed of a capacitor; A first conductive line formed in parallel with the power supply and configured with the parallel concentrator formed of a capacitor; And a second conductive line connecting the connection part and the ground.

According to the embodiments, it is possible to provide a wideband antenna device that implements a wideband impedance bandwidth by combining two antennas having resonances in the same frequency band through a wideband feeding structure.

According to embodiments, a broadband antenna device using a Planar Inverted-E (PIE) feeding structure and two or more radiators and additionally placing a lumped element in the PIE feeding structure to adjust the coupling between the radiators to expand the impedance bandwidth Can provide.

1 is a view schematically showing the structure of a broadband antenna device according to an embodiment.
FIG. 2 is a diagram illustrating an enlarged view of portion A of FIG. 1.
3 is a diagram illustrating a power supply structure for multiple antenna resonance coupling according to another embodiment.
4 is a diagram illustrating an input impedance of a broadband antenna device according to an exemplary embodiment.
5 is a diagram illustrating return loss between a broadband antenna device and a conventional PIFA antenna device according to an embodiment.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings. However, the described embodiments may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. In addition, various embodiments are provided to more fully describe the present invention to those skilled in the art. Shape and size of the elements in the drawings may be exaggerated for more clear description.

The following embodiments provide a technique for implementing a wideband impedance bandwidth by combining two antennas having resonance in the same frequency band through a wideband feeding structure.

In order to meet the radiation efficiency and bandwidth of the antenna, the ground size and coupling of the terminal are very important. In general, the bandwidth of the antenna is very narrow in the case of very small ground compared to the wavelength.

Planar Inverted-F Antenna (PIFA), which is widely used as an existing antenna for mobile terminals, was able to freely adjust the coupling between the power supply and the radiator by using an inductive short-circuit pin, but the impedance bandwidth is very insufficient for the recent demand of the communication service frequency band Have

In order to solve this problem, a plurality of radiators may be used, but resonance may not be coupled to each other due to coupling problems between radiators. In recent years, PIE (Planar Inverted-E) technology has been studied for a technology that can expand a bandwidth 2 to 3 times compared to PIFA by converting to a resonant short pin using a capacitive short pin in a feed structure.

However, this also requires additional impedance bandwidth for terminals with very small ground compared to the wavelength.

1 is a view schematically showing the structure of a broadband antenna device according to an embodiment.

Referring to FIG. 1, a broadband antenna device according to an embodiment may implement a broadband impedance bandwidth by combining two antennas having resonances in the same frequency band through a broadband feeding structure.

Here, two antennas are connected from a power supply through a wideband parallel resonant feeding structure. In the feeding structure, a concentrated element is disposed between the two antennas so that the electromagnetic coupling force between the antennas can be controlled through the concentrated element. The input impedance of the antenna can be controlled independently through the arrangement of each antenna and the feeding structure and the control of the lumped elements in the feeding structure.

Broadband impedance bandwidth characteristics can be obtained by combining existing broadband feed structures and two or more antenna resonances independently.

For example, it illustrates an arbitrary portable terminal structure including an antenna designed on a 43 x 80 mm ² Print Circuit Board (PCB). Broadband antenna device 100 according to an embodiment is designed to operate at 840 ~ 1040 MHz. The antenna area of the broadband antenna device 100 is 43 x 10 mm ² on the same plane 111 as the ground 110 and 43 x 10 mm ² on the surface 112 perpendicular to the ground 110. It is.

The antenna feeding structure on the PCB is positioned at the end of the ground 110 and is configured in a loop form (A), and may have a resonant circuit structure including a power supply, a series concentrating element, and a parallel concentrating element.

FIG. 2 is a diagram illustrating an enlarged view of portion A of FIG. 1.

The broadband antenna device according to an embodiment uses a Planar Inverted-E (PIE) feeding structure and two or more radiators, and additionally arranges lumped elements in the PIE feeding structure to adjust the coupling between the radiators to expand the impedance bandwidth. Can be.

Two or more radiators are connected to the feeding structure, and the concentrating element is additionally disposed between the radiators in the feeding structure. Through this concentrator, coupling between radiators is adjustable and two radiator resonances can be coupled to each other. The combined two radiator resonances are combined with the existing broadband technology, PIE resonance, to secure additional impedance bandwidth.

As an example, a broadband antenna device according to an embodiment will be described in more detail.

Referring to FIG. 2, the broadband antenna device 100 may include a ground 110, a plurality of radiators 160 and 170, and a power supply structure, and may form a plurality of antennas. Here, the power supply structure may refer to the power supply structure described above.

The ground 110 may be formed on a substrate, and more specifically, the ground 110 may be formed in a predetermined region on the substrate, and the ground 110 may be made of a conductive metal material and electrically coupled to the feeding structure. have.

Here, the substrate is a body portion to which the components of the broadband antenna device are coupled, and as described with reference to FIG. 1, may be formed of a PCB. The substrate may be made of a dielectric material, and the dielectric constant of the substrate may be determined by required radiation characteristics. In addition, the PCB may be used as well as a flexible printed circuit board (FPCB).

The plurality of radiators 160 and 170 are spaced apart from each other and connected to the power supply structure, for example, may be arranged in parallel with each other, so that a plurality of antennas may be configured by the plurality of radiators 160 and 170.

For example, the plurality of radiators 160 and 170 may be configured as two radiators, and thus two antennas may be implemented. That is, the plurality of radiators 160 and 170 may be composed of the first radiator 160 and the second radiator 170.

Here, the first radiator 160 may be disposed in the antenna region on the same plane 111 as the ground 110 described with reference to FIG. 1, and the second radiator 170 may have a surface 112 perpendicular to the ground 110. It can be extended to the antenna area of) and can be bent to extend longer.

The power supply structure is positioned at one end of the ground 110 and may form a loop including the power supply 121.

The power supply structure may include the power supply 121, the series concentrating elements CF ₁ and 131, and the parallel concentrating elements CF ₂ and 141.

The series concentrating element 131 may have a power supply structure connected in series with the power supply 121, and may be disposed between the plurality of radiators 160 and 170 to adjust coupling between the plurality of radiators 160 and 170. The series concentrator 131 may be formed of a capacitor.

The parallel concentrator 141 may be connected in parallel with the power supply 121. In this case, the parallel concentrator 141 may be formed of a capacitor.

Accordingly, a resonance circuit including a power supply 121, a series concentrator 131, and a parallel concentrator 141 may be provided.

In addition, in another aspect, the power supply structure may include a power supply unit 120, a connection unit 130, a first conductive line 140, and a second conductive line 150.

The power supply unit 120 is composed of a power supply 121, the connection portion 130 is made in series with the power supply 121, connects between the plurality of radiators (160, 170) and the series concentrating element 131 is Can be configured. In addition, the first conductive line 140 may be formed in parallel with the power supply 121, and the parallel concentrating element 141 may be configured, and the second conductive line 150 may connect the connection unit 130 and the ground 110. have.

The resonance of the plurality of radiators 160 and 170 are coupled to each other by the series concentrating element 131 and the parallel concentrating element 141 of the power supply structure, and the resonance of the coupled radiators 160 and 170 is PIE (Planar Inverted). -E) Combined with resonance, additional impedance bandwidth can be secured.

A plurality of antennas (for example, two antennas) having the same resonance frequency are connected to the resonance circuit of the power supply structure. A power supply loop 121, a series concentrator 131, and a parallel concentrator 141 may form a feed loop and adjust an input impedance of an antenna. Since the input impedance of the antenna can be adjusted using a lumped element connected to the loop shape, the power supply 121 and the lumped element can be implemented regardless of the position of the resonance circuit.

3 is a diagram illustrating a power supply structure for multiple antenna resonance coupling according to another embodiment.

Referring to FIG. 3, a power supply structure for multiple antenna resonance coupling according to another embodiment is illustrated. As illustrated, positions of a power supply and a short circuit pin may be changed in the power supply structure. At this time, a capacitor must be configured between the antennas.

4 is a diagram illustrating an input impedance of a broadband antenna device according to an exemplary embodiment.

Referring to FIG. 4, which illustrates the input impedance of the broadband antenna device, the input impedance of the antenna may be controlled by using the series concentrating element CF ₁ and the parallel concentrating element CF ₂ having a power supply structure.

5 is a diagram illustrating return loss between a broadband antenna device and a conventional PIFA antenna device according to an embodiment.

Referring to FIG. 5, the return loss of the existing PIFA antenna device 510 and the broadband antenna device 520 according to an embodiment is shown in the same terminal structure. The conventional PIFA antenna device 510 satisfies a bandwidth of about 40 MHz with a return loss of -6 dB at 840 to 880 MHz, and the broadband antenna device 520 according to an embodiment has a wavelength of about 200 MHz at 840 to 1040 MHz. Meets the bandwidth.

This indicates that the impedance bandwidth of the broadband antenna device 520 according to the embodiment is improved by about 5 times or more, compared to the existing PIFA antenna device 510.

As portable wireless terminals have been miniaturized, numerous efforts have been made to obtain the radiation performance and the broadband characteristics of the antenna. However, a simple model has not been proposed for practical application. By utilizing the above embodiments, it is possible to realize a high-performance broadband antenna by applying a multi-antenna resonant coupling feed structure in a mobile phone, a portable wireless AP, a GPS terminal and the like. Therefore, embodiments of the present invention can implement a high radiation performance, broadband antenna in the mobile antenna field very efficiently.

These embodiments are not only mobile phones, but also terminals for wireless communication such as WCDMA, LTE, GPS, Wi-Fi, and Bluetooth, terminals using broadband, and multiple input multiple output (MIMO). ) In case of terminal using antenna, it is applicable, and this technology can be applied on PCB of the product.

When a component is referred to as "connected" or "connected" to another component, the component may be directly connected to or connected to the other component, but another component may be present in the middle. It should be understood that. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “… unit”, “… module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

In addition, the components of the embodiments described with reference to the drawings are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of the technical spirit of the present invention. Even if the description is omitted, it is obvious that a plurality of embodiments may be reimplemented into one integrated embodiment.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same or related reference numerals and redundant description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (5)

A ground formed on the substrate;
A feeding structure positioned on one side of the ground and forming a loop including a feeding power supply; And
A plurality of radiators connected to the feeding structure
Including,
The feeding structure,
A feeder configured with the feeder;
A connection portion formed in series with the power supply and configured to connect between the plurality of radiators and have a series concentrating element;
A first conductive line made in parallel with the power supply and configured with a parallel concentrator; And
A second conductive line connecting the connecting portion to the ground
To include, form a Planar Inverted-E (PIE) feeding structure,
The plurality of radiators,
The PIE (Planar Inverted-E) feeding structure is arranged spaced apart from each other at a predetermined interval, one of the plurality of radiators are disposed in the antenna area on the same plane as the ground, the other of the plurality of radiators Extending to the antenna area of the surface perpendicular to the ground, the plurality of radiators are configured by the plurality of radiators,
Resonances of the plurality of radiators are coupled to each other by the series concentrator and the parallel concentrators of the feed structure, and the resonances of the plurality of coupled radiators are coupled simultaneously with Planar Inverted-E (PIE) resonances to provide additional impedance bandwidth. Securing
Characterized in that, the broadband antenna device. The method of claim 1,
The feeding structure,
A serial concentrator connected in series with the power supply and having a capacitor disposed between the plurality of radiators to adjust coupling between the plurality of radiators;
Further comprising a wideband antenna device. The method of claim 2,
The feeding structure,
Parallel lumped element consisting of a capacitor connected in parallel with the power supply
More,
Having a resonant circuit comprising said power supply, said series concentrator and said parallel concentrator
Characterized in that, the broadband antenna device. delete delete

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