KR100525313B1 - A patch antenna using L-Probe feed with Shorting point - Google Patents

Abstract

 The present invention relates to a directional patch antenna used for mobile communication (cellular, PCS, IMT-2000, etc.) and data communication (ISM-band, Wireless LAN), etc., and the L-Probe feeding structure and backside generally used for patch antenna By adding a shorting point with the reflector, it is structurally stabilized by using it as a feeding part of a broadband patch antenna. The simplified structure maximizes the gain. The present invention relates to a broadband patch antenna that enables the use of an improved antenna rather than an antenna.

The broadband patch antenna has an L-feeding structure having a radiating element unit 110 that determines an antenna gain and beam width, a shorting point for supplying predetermined power to the radiating element through EM coupling, and matching impedance. The feeder 112 and the reflector 113 reflects the role of ground and the radiated power to be directed in one direction. do.

Description

Patch antenna using L-Probe feed with Shorting point {A patch antenna using L-Probe feed with Shorting point}

The present invention relates to a directional patch antenna used in mobile communication (cellular, PCS, IMT-2000, etc.) and data communication (ISM-band, Wireless LAN). More particularly, the present invention relates to a patch antenna designed by applying an L-Probe feeding structure to widen a bandwidth and easily tune a frequency, including a matching circuit, and a power supply unit for efficiently supplying power to a radiating element of an antenna.

As the patch antenna used for the same purpose, there are a microstrip patch antenna using a dielectric substrate (FIG. 1A), a patch antenna using a dipole element (FIG. 1B), a patch antenna using an L feeding method (FIG. 1C), and the like.

1A to 1B are patch antennas commonly used in a conventional mobile communication service or wireless communication, and FIG. 1A is a microstrip substrate including a feeder and a matching part, and a pattern of a feeder plate should be modified during frequency tuning. If the dielectric constant and thickness of the dielectric is not constant, detailed tuning may be difficult, and therefore, expensive dielectric substrates may be used, and etching may be necessary, which may be disadvantageous to the antenna cost structure. For this reason, a patch antenna using a dipole element in which a microstrip substrate is replaced is frequently used (FIG. 1B). However, the frequency resonance of the dipole is basically determined by the length of the device, and because it feeds directly with the cable, it has disadvantages in changing to other frequencies and in detailed tuning, and there are many points to fill the feed line. As a result, mass productivity may drop significantly. In the case of Figure 1c is a feed method to improve the bandwidth of the patch antenna can be manufactured in a wider bandwidth than the microstrip patch antenna, but the feed and the ground part is an open type that is not stable to use as an outdoor antenna, the peripheral It is easily affected by the environment. After all, the open type antenna is similar to the Whip antenna is affected by the ground. On the other hand, in the case of L-Probe feeding structure or dipole with shorting point, the feeding part and ground part are shorted DC so that it is less affected by the installation environment, and when installed outside, it can protect the system by lightning. do.

Accordingly, the present invention is to provide an excellent antenna for not only excellent bandwidth and gain, but also stable electrical characteristics with a simple structure that is not complicated.

The present invention for achieving the above object, the L-Probe feeding structure patch antenna having a shorting point that minimizes the size of the antenna by using a central portion of the dipole antenna is equivalently short (maximum current, minimum voltage) As a result, a patch antenna having a simple antenna structure and excellent electrical characteristics can be obtained.

The broadband patch antenna of the present invention includes a radiating element portion for determining gain and beam pattern, an L-Probe feeding portion having a shorting point for supplying a predetermined power to the radiating element through EM coupling and matching impedance, and ground. It is a reflector that reflects the role of and to radiate the power to be directed in one direction. It is basically composed of three basic parts of the antenna, and the radiator and the feeder on the reflector. It is characterized by consisting of a space ring (Spacer), a feed cable and a radome (Radome) for fixing the feeder.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A is a perspective view illustrating device arrangement of a broadband patch antenna according to a preferred embodiment of the present invention.

As shown in Figure 2a, the antenna of the present invention is designed by consisting of a radiating element portion 110 and the feeder 112 using a spacer (Spacer) on the reflector 113, the feeder ( 112) applies a L-Probe feeding structure having a shorting point to a patch antenna.

In the present invention, the L-Probe feeder having a modified shorting point designed as shown in FIG. 2B changes the area and height of the feeder properly by using the L structure feeding method 112a in detail, and changes the capacitance value according to the area. The detailed standing wave characteristics can be improved, and the short part 112d is designed to change the cross sectional area shorted with the ground, and the feed core and the ground have a short structure so as to have a stable characteristic so as not to be sensitive to external installation environment. In addition, the radiating part 112b has a + -shaped structure to match the phase at the feeding position to the radiating element so that the maximum power supplied from the feeding part can be delivered to the radiating part through EM coupling. In addition, resonant frequency tuning is possible by simply adjusting the length of the radiator.

The broadband patch antenna configured as described above has a perfect structure of the antenna with the minimum structure of the radiator 110, the feeder 112, and the reflector 113, and the detailed standing wave characteristics can be tuned by simple tuning at the feeder. When moving to another frequency, it is possible to easily manufacture a new frequency band antenna by adjusting only the length of the feed element and the length of the radiator.

3 is a view showing the standing wave ratio characteristics for the patch antenna according to FIG. 2A, with a bandwidth of about 20.38% and having a bandwidth of about 20.38% for mobile communication (Cellular, PCS, IMT-2000 ...), wireless communication (WLL, ISM, It can be seen that the antenna design for use in most systems such as WLAN ...) and DMB (Digital Multimedia Broadcasting) related frequency bands is possible with the technique of the present invention. On the other hand, Figure 4 is a measurement of the antenna pattern according to Figure 2, Figure 4a is a horizontal pattern (Azimuth), Figure 4b is a vertical pattern (Elevation), the beam width was about 70 degrees similar to the general patch antenna, The ratio was also excellent at about 20 dB, and the gain was about 8 dBi in all bands, which is better than that of the conventional microstrip patch antenna (7 dBi).

As described above, according to the broadband patch antenna of the present invention, not only the antenna structure is simple, but also detailed tuning and frequency shifting can be easily performed, and the broadband and gain characteristics are excellent. In addition, the radiator, the feeder, and the reflector are integrally assembled so that the mobile communication repeater system and the wireless communication system can be integrated, and also have excellent electrical and physical characteristics as an external antenna by covering the radome.

Compared with the prior art, the structure is simple, so that the productivity and the transmission and reception electrical characteristics are stabilized due to the reduction of the number of working processes and the reduction of the net material cost.

 1A, 1B, and 1C are external views of an antenna type used as a patch antenna for mobile communication and short-range communication according to one embodiment of the prior art.

2A is an external view of a patch antenna using an L-Probe feeder having a shorting point according to a preferred embodiment of the present invention. FIG. 2B is a detailed view of a feeding part showing the L-Probe feeding part having a shorting point in detail. FIG.

FIG. 3 shows the standing wave ratio characteristics of FIG. 2, showing broadband characteristics, FIG. 4A shows a horizontal radiation pattern, and FIG. 4B shows a vertical radiation pattern.

* Description of the symbols for the main parts of the drawings *

110: radiator 112: L-Probe feeder having a shorting point

113: reflector

Claims (2)

The radiating element unit 110 that determines the gain and beam width of the antenna, and the power supply unit having a feeding structure of L structure and a shorting point to match the impedance while supplying predetermined power to the radiating element through EM (Electromagnetic) coupling ( 112), the role of the ground and the reflection portion for reflecting the radiated power to be directed in one direction, and the radiation support, the power supply, characterized in that it consists of a space support 111 for fixing the reflection unit as one Broadband patch antenna. The feeding part used for the patch antenna uses the feeding method of the L structure 112a, and the area and height of the feeding part 112a can be appropriately changed to change the capacitance value and to improve the detailed standing wave characteristics according to the area. The section 112d is designed in such a way that the cross-sectional area shorted to the ground can be changed, and the feed core and the ground have a short structure so that they have a stable characteristic so as not to be sensitive to an external installation environment. 112b) has a + -shaped structure to match the phase at the feeding position to the radiating unit 110 so that the maximum power supplied from the feeding structure 112a of the L structure can be transmitted to the radiating unit 110 through EM coupling. Broadband patch antenna feeder.