KR100841938B1 - helix slot antenna - Google Patents

Abstract

At least one helix slot antenna according to the present invention is formed in a spiral shape surrounding an upper portion of a polygonal ceramic dielectric block surface in order to receive satellite signals or gap filler signals such as DAB / DMB and GPS. Implementing the above feed line, it is characterized in that the lower surface to form a ground, the slot formed in the ground surface. The present invention is designed to solve the structural problems and design problems of the user equipment according to the use of the conventional helix antenna, by implementing a helix antenna with a reduced width while maintaining the reception performance of the antenna inside and outside the receiver of the user equipment, etc. It is aimed at miniaturization of the antenna which can be positioned.

Helix Antenna, Slot, DAB / DMB, Isodirectional Antenna

Description

Helix slot antenna

1A and 1B are a perspective view and a development view showing an embodiment of a helix antenna according to the prior art,

2 is a view showing a DAB having a helix antenna according to the prior art,

3A and 3B are perspective and exploded views showing a first embodiment of a helix slot antenna according to the present invention;

4A and 4B are perspective and exploded views showing a second embodiment of the helix slot antenna according to the present invention;

5A and 5B are perspective and exploded views showing a third embodiment of the helix slot antenna according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for receiving a satellite signal or a gap filler signal on the ground. More specifically, the present invention relates to a global positioning system (GPS), digital multimedia broadcasting (DMB), digital audio broadcasting (DAB), and navigation. The present invention relates to an antenna module that can be miniaturized than a conventional helix antenna by implementing a small helix antenna for receiving a satellite signal or a gap filler signal.

In recent years, the use of wireless communication is rapidly increasing, and in order to meet the portability of wireless communication devices, a slim antenna that can be mounted inside a transceiver according to the trend of miniaturization and mass production needs and design is maintained while maintaining the performance of the antenna. The demand is rising.

In general, a microstrip patch antenna is used in a mobile receiver for using mobile multimedia information, broadcasting service, or current location and electronic map service. In addition, when receiving GPS satellite signals, left hand circular polarization or right hand circuit polarization transmitted to minimize the influence of the ionosphere interference and the multipath signal (noise) reflected from the ground. A circular polarization antenna is used for receiving the antenna, and as such an antenna, a patch antenna having a low reception rate and a good reception rate among various antennas is mainly used. The patch antenna is a kind of antenna capable of retaining the greatest gain and directivity in a given space, and is used as a communication relay antenna integrated with various mobile communication devices and portable devices. However, more compact helix antennas are preferred over external patch antennas for mounting in increasingly smaller sets.

1 is a view showing a development of an embodiment of a helix antenna according to the prior art. The conventional helix antenna is printed by twisting feed lines 12 at regular intervals on a cylindrical dielectric block 11 of ceramics, and the overall size of the terminal must be increased in consideration of the mounting space in the user equipment. It is impossible to mount it on the main body, and even if it is mounted on the main body, it is difficult to adjust the angle with the satellite to receive GPS satellite signals well because of frequency interference with other components. In addition, the helix antenna according to the related art uses a method of processing the feed line 12 or the conductive material 13 on the top surface of the antenna in the cylindrical dielectric block 11 by using a laser, in which defective products are generated. There is a problem.

FIG. 2 is a view showing a DAB using a conventional helix antenna as shown in FIG. 1, in which a miniaturized antenna mechanism 22 is positioned above the DAB 21, and the helix antenna is positioned therein. In such a manner that the antenna mechanism 22 protrudes above the upper end by the height of the helix antenna.

As described above, in recent years, since the use device itself such as DAB, DMB, etc. has become miniaturized and design is important, the built-in antenna which can be mounted inside the device is mainly used. However, there is a problem in that the user equipment having the built-in antenna has a weak reception sensitivity when compared to an external antenna. In general, when a built-in antenna and an external antenna are used, the reception sensitivity difference of about 2 dB to 3 dB is different. Is showing.

Therefore, as the miniaturization trend and the functions of the products are being combined with the slimming to the portable, for example, portable DAB, DMB, and mp3 companies need to develop a DAB that can be miniaturized. There is a demand for the development of a built-in antenna that can be built in or more than to satisfy the miniaturization and portability.

The present invention is designed to solve the structural problems and design problems of the user equipment according to the use of the conventional helix antenna as described above by configuring a helix antenna with a reduced width, while maintaining the reception performance of the antenna, such as internal and external receivers It is an object to provide a miniaturized slot helix antenna that can be located at.

Helix slot antenna according to the present invention for achieving the above object is a polygonal ceramic dielectric block; At least one feed line formed in a spiral shape surrounding an upper surface of the ceramic dielectric block; And a ground plane formed at a lower end of the ceramic dielectric block and connected to the feed line, wherein at least one slot is formed in the ground plane so that a satellite or gap filler signal such as DAB / DMB and GPS is formed. It is characterized in that to solve the electrical length problem of the antenna for receiving the. In this case, the feed line is formed by a thick film printing method, by adjusting the formation height of the ground plane can match the impedance of the antenna and reduce the noise. On the other hand, the slot starts at the portion where the feed line and the ground plane is connected, is formed in a 'b' shape, the slot formed on the left side of the feed line is formed in a shape surrounding the slot formed on the right side Or the left and right sides of the feeder line are formed in an oblique form parallel to the feeder line, and the slot formed on the left side can be formed to be vertically folded at the same height as the slot formed on the right side. .

Hereinafter, the miniaturized helix slot antenna according to the present invention will be described in detail with reference to various embodiments illustrated in FIGS. 3 to 5.

3 is a view showing a first embodiment of a miniaturized helix slot antenna according to the present invention.

Referring to FIG. 3, the helix slot antenna has a width of 6.7 mm and a height of 18 mm, which is narrower than that of the conventional antenna. The dielectric block 31 is made of a polygonal pillar of ceramics to facilitate printing of a conductive material. Do it. In addition, the feed line 32 has a form in which the feed line 32 is twisted diagonally at regular intervals and printed. In addition, as shown in the development of the right side, the ground plane 33 is formed at the lower end of the surface of the dielectric block so that the feed line 32 and the ground plane 33 are connected. A plurality of slots 34 and 35 are formed in the ground plane 33. At this time, the printing of the feed line 32 or the conductive material 36 on the top surface of the polygonal dielectric block uses a thick film printing method, which reduces the incidence of defective products than the conventional printing method using a laser. On the other hand, there is a problem that the characteristics are different. In order to solve this problem, the height of the ground plane 33 is adjusted to reduce the impedance matching problem and noise influence of the antenna. In addition, the electrical length problem of the antenna can be solved by giving the slots 34 and 35 to the ground plane 33. The slot starts at a portion where the feed line 32 and the ground plane 33 are connected in a letter shape. And formed at both edges of the feed line, and the left b-shaped slot 35 of the feed line may include a right b-shaped slot 34 of the feed line. At this time, the antenna impedance may be adjusted by adjusting one or more of the length, shape, number, width, and thickness of the slot, and the slot in the horizontal direction may have a circular polarization (CP) characteristic and the direction of the feed line 32 to improve gain. The current flows smoothly under the influence of the slot and is formed to increase the gain of the antenna.

A first embodiment of the helix slot antenna according to the invention is a ceramic dielectric antenna. In the case of ceramic antennas, the performance (gain / bandwidth / volume) decreases due to miniaturization due to high dielectric constant, but contributes to the miniaturization of communication equipment with a small and low profile, and since it is built-in, there is little risk of damage due to external impact on the equipment. In addition, the frequency range in which the ceramic antenna can exhibit sufficient performance is between several hundred MHz and several kilohertz, and since most systems such as wireless communication and cellular phones are included in this frequency range, the use area will be widened in the future.

In addition, the first embodiment of the helix slot antenna according to the present invention, which adds a slot, can be mounted inside the receiver by reducing the size of the antenna module compared to the conventional helix antenna, and can be installed in the receiver while maintaining the reception performance. It has an effect that can be satisfied. Table 1 below compares the electrical characteristics of the first embodiment of the conventional helix antenna and the helix slot antenna according to the present invention.

Helix antenna Helix slot antenna Operating frequency 2338 ± 12.5 MHz 2388 ± 15 MHz Gain @ Zenith 0 dBi -2 dBi Polarization LHCP LHCP Size width = 10mm, height = 18mm width = 6.7mm, height = 18mm

In Table 1, the antenna gain means a measured value when compared with a logical antenna called a directional antenna. That is, the ratio of the power supplied to the input of the given antenna and the power required to the input of the reference antenna to obtain the same electric field strength at the same distance in the given direction. The unit is decibels (dB). The unit of dBi is usually used for isotropic antennas, and the unit of dBd is used to calculate gains for dipole antennas. The higher antenna gain means that a stronger electric vehicle can be sent in a specific direction where electromagnetic waves are desired. The gain of the conventional helix antenna is 0 dBi, while the gain of the first embodiment of the helix slot antenna according to the present invention is -2 dB. The gain of the conventional helix antenna is higher than the gain inherent in the present invention, but when the low noise amplifier is attached, the gains of the antenna modules become equal to each other, so that the conventional embodiment of the helix slot antenna according to the present invention is used. Compared to the helix antenna, it is smaller in size but does not lag behind in reception performance.

On the other hand, as shown in Figure 3, the most preferred form of the first embodiment of the helix slot antenna according to the present invention has the above-described effect is a hexagonal dielectric block of a slightly flat shape of 6.7mm horizontally, 8.7mm vertically In order to facilitate mounting inside the user equipment rather than a regular hexagonal antenna. However, even if the shape of the antenna is in the shape of a polygon such as a regular hexagon, an octagon, a square, etc., the shape of the antenna will not be limited to the shape of the hexagon if it has the same effect as the first embodiment of the helix slot antenna according to the present invention.

4 is a view showing a second embodiment of the helix slot antenna according to the present invention.

4, the width of the helix slot antenna is also 6.7 mm wide and 18 mm high, which is narrower than the conventional antenna. In addition, in order to facilitate printing, the dielectric block 41 is a polygonal pillar of ceramics, and the feed line 42 is twisted at regular intervals and printed. Then, as shown in the developed view on the right side, the slot 44 is formed in the ground plane 43. The slot 44 may be started at a portion where the feed line 42 and the ground plane 43 are connected in an oblique form positioned in parallel with the feed line 42, and the length of each slot may not be constant. have. The second embodiment of the helix slot antenna according to the present invention has the same effect as the first embodiment.

5 is a view showing a third embodiment of a miniaturized helix slot antenna according to the present invention.

Referring to FIG. 5, the helix slot antenna also has a width of 6.7 mm and a height of 18 mm, the width of which is narrower than that of the conventional antenna, and the dielectric block 51 is made of a polygonal ceramic pillar to facilitate printing. , And the feed line 52 is twisted at regular intervals and printed. In addition, the slots 54 and 55 are formed in the ground plane 53 as shown in the developed view of the right side. The slots 54 and 55 may be formed in the form of an oblique line starting at a portion where the feed line 52 and the ground plane 53 are connected and parallel to the feed line 52 on both sides of the feed line 52. The slot 55 positioned on the left side of each feed line may be diagonally descending and vertically descending from the same height as the right slot 54. The third embodiment of the helix slot antenna according to the present invention has the same effect as the first embodiment.

Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the specific slot form described above, and if the design can have the same effect as the embodiments, the designer can design the slot freely. In addition, the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Such changes are intended to fall within the scope of the claims.

The miniaturized helix slot antenna according to the present invention is a miniaturized antenna than the conventional cylindrical helix antenna, and thus can satisfy the miniaturization requirement to be mounted inside the user equipment, thereby solving the problem of slimming and designing the user equipment.

In the conventional DAB / DMB terminal, while using the cylindrical helix antenna according to the prior art, the design inconvenience of mounting a separate device to position the antenna was to bear the inconvenience of the helix antenna according to the prior art is high. It was because of merit. Even when a slimmer antenna is released due to the manufacturer's demand for antenna miniaturization, there have been problems in that the reception performance is reduced or the antenna characteristic is changed.

However, the miniaturized helix slot antenna according to the present invention is not significantly different in terms of reception performance or gain compared to conventional antennas, and the dielectric block of the antenna can be made polygonal rather than cylindrical to facilitate printing, and the thick film printing method can be used. Application can reduce the incidence of defective products. In addition, by preventing the change in the characteristics of the antenna that can occur when using the thick film printing method by moving the frequency by adjusting the height of the ground, it is possible to transmit and receive two or more channels at one frequency by adjusting the timing and circular polarization antenna with low polarization loss Can take advantage of the benefits. In addition, the height adjustment of the ground can solve the noise influence on the antenna, and if the slot is formed in the ground, it can solve the electrical length problem of the antenna as well as the length, shape, number, width, and thickness of the slot. The antenna impedance may be adjusted by adjusting one or more of the following.

Furthermore, the miniaturized helix slot antenna may be located inside / outside according to the terminal design, thereby enabling various applications.

Claims (7)

Polygonal ceramic dielectric blocks; At least one feed line formed in a spiral shape surrounding an upper portion of the ceramic dielectric block surface; And A ground plane formed below the ceramic dielectric block surface and connected to the feed line; And a slot for adjusting the length of the feed line in the ground plane to receive satellite signals such as DAB / DMB and GPS or gap filler signals. The method of claim 1, The feed line is a helix slot antenna, characterized in that formed in the thick film printing method. The method of claim 1, The ground plane is a helix slot antenna, characterized in that for adjusting the formation height to match impedance and reduce noise. In claim 1, The slot is formed in a 'b' shape starting from the portion where the feed line and the ground plane is connected, characterized in that the slot formed on the left side of the feed line is formed around the slot formed on the right side Helix slot antenna. In claim 1, The slot is formed in the shape of an oblique line starting from a portion where the feed line and the ground plane is connected, the direction of the slot is formed helix slot antenna, characterized in that parallel to the feed line. In claim 1, The slot starts at a portion where the feed line and the ground plane are connected to each other, and is disposed on the left and right about the feed line and is formed in an oblique form parallel to the feed line, and the slot formed at the left side is a slot formed at the right side. Helix slot antenna, characterized in that formed to be bent vertically at the same height. The method according to any one of claims 4 to 6, Helix slot antenna, characterized in that for adjusting the impedance of the helix slot antenna by adjusting one or more of the length, shape, number, width, and thickness of the slot.

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