KR100424050B1 - Micro chip antenna - Google Patents

Abstract

The present invention can achieve a return loss of -10dB or less in a wide band, and has a good standing wave ratio of 1: 1.0310 to 1.1046 or less, an input impedance of approx. 50 kHz, and a radiation pattern in all directions. It can also be used as a transmit / receive antenna for flying objects such as rockets, missiles, aircrafts, and solid state devices such as oscillators, amplifying circuits, variable attenuators, switches, modulators, mixers, phase shifters, etc. Design on board with modules in solid state, personal cellular services using cellular phones and personal communication services, Wireless Local Looped and Future Public Land Mobile Telecommunication Systems ) Can be used for wireless communication including IMT-2000 and satellite communication. The present invention relates to a microchip antenna that can be used very easily for transmitting and receiving.

Description

Microchip Antenna {MICRO CHIP ANTENNA}

The present invention relates to a microchip antenna, and more particularly, it is possible to obtain a return loss and standing wave ratio suitable for a communication device in a broadband, to realize a radiation pattern for all directions, and to minimize the size of the antenna. It relates to a micro chip antenna (Micro Chip Antenna) that can be compactly embedded in a variety of wireless communication equipment, including portable terminals and Bluetooth.

In general, the frequency mainly used in mobile communication is utilized in the 150-900MHz band, but recently, it is also being performed in the frequency of the quasi-microwave band which is 1 to 3 GHz band due to the rapid increase of the demand.

The use of semi-microwave bands is already commercialized in the 1.7-1.8 GHz band, and in the 2000s, it was also adopted in next-generation mobile communication systems such as GMPCS (1.6 GHz) and IMT2000 (2 GHz), which can be used anywhere in the world. Will be.

With the rapid development of mobile phones and miniaturization and high-end, the importance of the antenna, which is the entrance of information and communication, has naturally emerged. For example, the microchip antenna has emerged as an object of special research in this field.

In general, a microchip antenna is more efficient with a lower dielectric constant and a thicker substrate. And because the efficiency is low when the frequency is low and the efficiency is high when the frequency is high, the microchip antenna that can be applied at a relatively high frequency such as the quasi-microwave band is the minimum that can satisfy the miniaturization constraints pursued by the mobile phone. It can be said that the antenna of.

On the other hand, in the conventional microchip antenna, a radiation patch having a resonant length of λ / 2 over a wide ground patch has a resonance shape, and has a structural form. In addition, since the electric field lines are formed between the patch and the ground patch on the left and right sides of the feed point, shortening the left and right ground patches at the feed point is limited to the formation of the electric field lines, resulting in a decrease in gain, which makes it difficult to miniaturize. It also follows.

In addition, the microchip antenna is a simple planar antenna having a dielectric formed on the ground patch and having a rectangular or circular radiation patch on the top surface of the dielectric, which has a disadvantage of narrow bandwidth and low efficiency. However, there is an advantage that it is suitable for mass production because the price is low and can be manufactured in a small size and light weight.

In addition, the microchip antenna is widely used as a transmitting / receiving antenna for flying objects such as rockets, missiles, and aircrafts because it can be freely banded and wound around a variety of devices and components and can be easily attached to a moving object at high speed. have.

In addition, microchip antennas can be designed on board with solid state modules such as oscillators, amplifiers, variable attenuators, switches, modulators, mixers, phase shifters, and the like. It also has features.

These microchip antennas can be designed to have one or two feed points in a circular or rectangular radiation patch in satellite communications requiring circular polarization, and can be used for doppler radar, radio altimeter, and missile telemetry. It can also be used in the use and remote sensing of weapons, environmental machines, transmission elements of composite antennas, satellite controlled receivers, and radiators in biomedical applications.

On the other hand, with the rapid development of informatization, mobile communication terminals such as automobile phones, pocket bells and cordless telephones are rapidly spreading, and as the size of such mobile communication equipment is miniaturized, the size of the antenna is inevitably smaller. There is no choice but to reality.

1 is a side view showing a general microchip antenna.

In the conventional microchip antenna, as shown in FIG. 1, both ends of the radiation patch 1 are open so that the current distribution becomes zero, and the voltage distribution has a maximum value. The feed position is determined by the ratio of the value of the current distribution and the value of the voltage distribution in accordance with the resistance value of the feed line 2.

Also, the electric force lines 3 and 5 can be considered to be divided into vertical components and horizontal components, and the vertical components are reversed in phase, and only horizontal components are arranged in phase.

In the case of forming a short length of the ground patch 6 in such a microchip antenna, the range of the electric field lines 3 and 5 is limited and the gain is attenuated. As a result, the antenna can be miniaturized by shortening the ground patch 6. Can not.

In general, a microchip antenna is a unit of the VHF / UHF band, and a small, light, and compact structure is desired. Examples of the modified microchip antenna developed by miniaturization include QMSA (Quarter-Wavelength Micro-Strip Antenna) and PMSA (Post). -loading micro-strip antenna, window-attached micro-strip antenna (WMSA), frequency-variable micro-strip antenna (FVMSA), and the like. These PMSAs, WMSAs and FVMSAs are partially modified from QMSAs and have basically similar radiation patterns.

Figure 2 is a perspective view showing the configuration of the QMSA according to the prior art, the width (W) of the radiation patch 23 and the ground patch 21 to provide a miniaturized antenna to be mounted within a limited volume of the small radio equipment It is comprised similarly and has the characteristic of extending | stretching and using the ground patch 21 in the opposite direction to the radiation opening 22. As shown in FIG.

That is, in the QMSA shown in FIG. 2, the dielectric 22 and the radiation patch 23 are sequentially attached to the ground patch 21 of lambda g (internal wavelength) / 2, and one side of the ground patch 21 is radiated. It is short-circuited to the patch 23, and the length of the radiation patch 23 is designed so as to have a constant frequency range by configuring lambda g / 4.

In addition, the outer conductor of the feed line 24 is grounded to the ground patch 21, and the inner conductor (center conductor) of the feed line 24 passes through the ground patch 21 and the dielectric 22 to radiate the patch 23. (Japanese Society for Electronics and Information Science Vol.J71-B, November 1988). The dielectric 22 may typically be polyethylene (ε _r = 2.4), Teflon (ε _r = 2.5) or epoxy-fiberglass (ε _r = 3.7).

3 shows a change in gain ratio with respect to a change in Gz of FIG. 2, where 0 (dB) represents the gain of the most basic half-wavelength dipole antenna. Gz plays a very important role in determining the rate of radiation increase. 4 illustrates a gain change rate with respect to the entire length L of the antenna of FIG. 2, and FIG. 5 illustrates a gain rate with respect to the width W of the radiation patch 23 of FIG. 2.

6 is a measurement of the radiation characteristics of the QMSA of FIG. 2, wherein (a) is an XY plane, (b) is a YZ plane, and (a) is a ZX plane. As shown in (a), (b) and (c) of FIG. 6, it can be seen that the QMSA of FIG. 2 is an electric field antenna in which a radiation pattern propagates in almost all directions. Radiation characteristics of this QMSA are the parameters of the antenna: the total length of the antenna (L) = 7.67 cm, Gz = 2.79 cm, the width of the radiation patch 23 (W) = 3 cm, and the thickness of the dielectric (22) = It is an example in the case where 0.12 cm and permittivity (ε _r ) = 2.5 (teflon).

On the other hand, when the standing wave distribution is located close to the minimum point in a complex urban environment, the electric field antenna is disturbed in communication due to a decrease in transmission and reception sensitivity due to diffraction and reflection of a signal.

Therefore, the current radio equipment system utilizes spatial diversity, directional diversity, polarization diversity, and the like to overcome this problem, and since it is difficult to solve low reception sensitivity due to multipath, two or more antennas may be installed. .

On the other hand, the modified microchip antenna PMSA (not shown) has two radiation openings on both sides of the radiation patch, and a short post is connected to the ground patch and the radiation patch through a dielectric instead of the short end of the QMSA antenna. In this configuration, the feeder line is positioned at a predetermined point. Two opening surfaces exist, but the radiation pattern is substantially similar to that of the QMSA.

In addition, the modified microchip antenna WMSA (not shown) is designed to shorten the length of the radiation patch by forming a slit at a certain point of the radiation patch of the QMSA to have a reactance component, FVMSA (not shown) Is an antenna proposed to electronically change the resonant frequency of the QMSA by changing the reactance load value.

However, these various conventional modified microchip antennas (MSAs), i.e., QMSA, PMSA, WMSA, and FVMSA, have a narrowed radiating aperture when the ground patch is made smaller, so that the gain is rather attenuated and the size thereof can be made smaller. In the case of using the portable radio equipment, since the electric field antenna is used, not only the electric field strength is lowered due to the wall surface of the building or various metal materials in the building, but also the reception sensitivity is reduced due to the multipath interference.

Accordingly, the present invention has been proposed to solve the problems described above, and its object is to provide a reflection loss suitable for a communication device in a wide band so as to be compactly embedded in various wireless communication equipment including a portable terminal and Bluetooth. The present invention provides a microchip antenna capable of obtaining the signal, having a good standing wave ratio, and implementing a radiation pattern in all directions.

1 is a side view showing a typical microchip antenna.

FIG. 2 is a perspective view illustrating a quarter-wavelength micro-strip antenna (QMSA) according to the prior art. FIG.

3 is a graph showing a gain relationship with respect to Gz of FIG.

4 is a graph showing a gain relationship with respect to the total antenna length L of FIG.

5 is a graph showing a gain relationship with respect to the radiation patch width (W) of FIG.

6 is a radiation characteristic diagram of FIG. 2, (a) in the XY direction, (b) the YZ direction, and (c) the ZX direction.

7 is a perspective view showing a microchip antenna according to the present invention.

8 is a plan view showing a microchip antenna according to the present invention.

9 is a bottom view of a microchip antenna according to the present invention.

10 is a side view showing a microchip antenna according to the present invention.

11 is a perspective view including a substrate for explaining a surface mounted state of a microchip antenna according to the present invention.

12 is a graph showing the return loss (RETURN LOSS) with respect to the frequency of the microchip antenna according to the present invention.

Figure 13 is a graph showing the standing wave ratio (VSWR) with respect to the frequency of the microchip antenna according to the present invention.

14 is a Smith chart for explaining a microchip antenna according to the present invention.

15 is a radiation pattern for explaining a microchip antenna according to the present invention.

Explanation of symbols on the main parts of the drawings

100 microchip antenna 10 dielectric

20: power supply hole 21: conductor

31: upper pad 32: lower pad

40: slot 51: center stripline

52: first array stripline 53: second array stripline

60: radiation patch 70: ground plane

200: substrate 81: non-ground surface

82: ground plane 91: signal line

92: ground line

The present invention for achieving the above object,

A feeding hole which is bored in a vertical direction on one side of the width direction of the dielectric forming a rectangular plated plated conductor;

An upper pad covered with a full width W as a length L1 of 2 to 4% from one end of the entire length L of the dielectric upper surface;

A lower pad covered with the full width W while being shorted to the upper pad with a length L2 of 4 to 8% from one end of the entire length L of the dielectric lower surface;

A slot stripped at an overall width (W) with a length (L3) of 2 to 4% from the upper pad with respect to the total length (L) of the upper surface of the dielectric, and between the slot from the other end of the upper surface of the dielectric At a point of about 10-15% of the length (l4) and 60-80% of the width (W1) with respect to the total length (l) and the total width (W) of the upper surface of the dielectric from the side where the feed hole is located. Center strip line and 10-15% of length (l5, l6) and 60, respectively, with respect to the total length (l) and the total width (W) of the upper surface of the dielectric on the opposite side where the feed hole is located. A radiation patch implemented by a first array strip line and a second array strip line respectively stripped at both sides of the center strip line with a width W2 and W3 of ˜80%;

The dielectric on the opposite side where the feed hole is located while covering the entire width (W) while being shorted to the radiation patch with a length (L7) of 4-8% from the other end with respect to the entire length (L) of the lower surface of the dielectric. And a ground plane extending from the lower pad to a position spaced apart from the lower pad by a length L8 of 8 to 12% with respect to the entire width W of the lower surface thereof. It is a basic feature.

Hereinafter, a preferred embodiment of a microchip antenna according to the present invention will be described with reference to the drawings. There may be many embodiments of the invention, and these embodiments will better understand the objects, features and advantages of the invention.

FIG. 7 is a perspective view illustrating a microchip antenna 100 according to the present invention, in which a ground plane 70 is covered on a lower surface of a rectangular dielectric 10, and a radiation patch 60 is covered on an upper surface of the dielectric 10. FIG. The figure is shown.

More specifically, as shown in the plan view of FIG. 8, the bottom view of FIG. 9, and the side view of FIG. 10, the microchip antenna 100 according to the present invention may be formed on one side of the dielectric 10 forming a rectangular shape. A feed hole 20 which is drilled in the vertical direction and plated with a conductor 21, and has a length of 2 to 4% from one end thereof with respect to the total length (l; 16 mm) of the upper surface of the dielectric material 10 (l1; 0.5). 2 mm to 4% from one end of the upper pad 31 covered with the entire width (W; 5 mm) and the entire length (l; 16 mm) of the lower surface of the dielectric material 10 (mm); ) And a lower pad 32 which is shorted to the upper pad 31 and covered with the entire width W (5 mm).

The radiation patch 60 provided on the upper surface of the dielectric 10 has a total width of 2 to 4% from the upper pad 31 (l 3; 0.5 mm) relative to the total length (l; 16 mm) of the upper surface. The upper surface of the dielectric 10 from the side where the feed hole 20 is located at a midway point between the slot 40 stripped with (W; 5 mm) and the slot 40 from the other end of the upper surface of the dielectric 10. Center stripped as 10-15% length (L4; 2mm) and 60-80% width (W1; 3.5mm) for the total length (l; 16mm) and full width (W; 5mm) of 10 to 15 for the total length (l; 16 mm) and the total width (W; 5 mm) of the top surface of the dielectric 10 at the center strip line 51 and the opposite side where the feed hole 20 is located, respectively. A first array stripline stripped on each side of the center stripline 51 with a length (l5; 2mm, l6; 2mm) and a width (W2; 3.5mm, W3; 3.5mm) of 60% to 80%, respectively (array strip line; 52) and second array strip It is implemented by a 53.

In addition, the microchip antenna 100 according to the present invention is a radiation patch 60 as the length (L7; 1mm) of 4-8% from the other end with respect to the total length (L; 16mm) of the lower surface of the dielectric 10 8-12% of width (W4) with respect to the total width (W; 5 mm) of the lower surface of the dielectric material 10 on the opposite side where the feeding hole 20 is located while covering the entire width (W; 5 mm) while being shorted. 0.5 mm), further including a ground plane 70 extending from the lower pad 32 to a position spaced apart by a length of 8 to 12% (l8; 1.5 mm).

In this manner, the radiation patch 60 is bent on the top surface of the dielectric 10 by the center strip line 51, the first array strip line 52, and the second array strip line 53, and radiates on the bottom surface thereof. Since the ground plane 70, which is grounded while implementing the patch 60 and the capacitance, is folded, it is possible to load the capacitance toward the radiation patch 60, thereby further miniaturizing the size of the microchip antenna 100. Not only can the gain be greater toward the radiation patch 60 where the capacity is loaded than the ground plane 70 side, but also the gain can have a larger radiation pattern, so that it can be used as a portable terminal or an antenna in a Bluetooth service band requiring broadband. It can be utilized suitably.

In other words, the radiation gain of the microchip antenna 100 according to the present invention may have a radiation pattern about -1 to 2 dB greater than the ground plane 70 toward the radiation patch 60 where the capacitance is loaded. It can be used very suitably for various wireless devices.

In addition, the manufacturing cost of the dielectric material 10 may be reduced by using an epoxy material instead of a ceramic, and mass production may be performed by PCB processing, and in particular, the influence of electromagnetic waves may be reduced.

FIG. 11 is a perspective view of a substrate 200 for explaining a surface mounted state of the microchip antenna 100 according to the present invention, and the other side of the dielectric 10 in which the feed hole 20 forms a rectangular shape in the width direction. The conductor 21 is plated and short-circuited with the radiation patch 60 so as to be connected as a surface mount, for example, when mounted on the Bluetooth substrate 200, and a signal from the signal line 91 is formed. If is supplied, it does not need a separate feeder line can actively overcome the negative distribution of the electric line.

Here, the Bluetooth substrate 200 is divided into a ground plane 82 and a non-ground plane 81, as shown in Figure 11, the power supply hole 20 of the microchip antenna 100 ) Is soldered and connected from the ground plane 82 to a signal line 91 that provides a signal by circuit matching, the ground plane 70 being grounded to the ground line 82 of the substrate 200. It can be seen that the surface mounted on the substrate 200 as a whole.

As described above, the microchip antenna 100 according to the present invention implemented through specific embodiments is also used as a transmission / reception antenna for flying objects such as various rockets, missiles, aircrafts, oscillators, amplification circuits, and variable attenuators. ), A solid state module such as a switch, a modulator, a mixer, a phase shifter, or the like, or a substrate 200 such as Bluetooth.

For example, the microchip antenna 100 according to the present invention is suitably applied to a portable terminal or Bluetooth as an embodiment.

A dipole antenna, a yagi antenna, etc. are mainly used for a portable terminal. The dipole antenna is a half-wavelength resonant antenna with circular omni-directional radiation characteristics. It is mainly used as a subscriber antenna for cellular communication and as a service antenna for small repeaters. Yagi antennas overlap several dipole antennas in a longitudinal direction. As an example of improving directivity, the antenna is used for an antenna of a small repeater.

In addition, the microchip antenna 100 may provide a personal mobile communication service using a cellular phone and a personal communication service (PCS), a wireless local looped service, a future public land mobile telecommunication system, and satellite communication. It can be used for wireless communication, including for transmitting and receiving signals between a base station and a portable terminal.

On the other hand, conventionally used microstrip multilayer antennas have the disadvantage of having a very narrow frequency bandwidth of several percent or less and a low radiation gain because the fundamental property is a resonant antenna, and it is not good to have to array or stack several patches. As a result, the size and thickness of the antenna are inevitably large, and for this reason, there is a problem in that a general personal portable terminal, a antenna for a portable communication repeater, and other wireless communication equipment are difficult to mount.

However, the microchip antenna 100 according to the present invention not only has a wide range of frequency bandwidths, but also can improve the gain by reducing the leakage current, and in particular, the standing wave ratio is improved, so that various types of communication, such as other portable terminals, are small. Minimize equipment.

Bluetooth is a wireless data communication technology that easily links notebook PCs and mobile devices such as mobile phones. It uses frequency hopping spectrum spreading (FH-SS) in the frequency band 2,400 to 2,483.5 MHz, and the communication distance is about 10 to 20 m. to be.

Bluetooth is often compared to IrDA, but has the advantage of not having to face the communication partner and not being cut off by fabric or paper.

The antenna used for Bluetooth may be considered in various forms, but considering the need to be embedded in a small digital device, the microchip antenna 100 is evaluated as the most viable alternative, and the performance of the required antenna is as follows. same.

First, the gain is important as antenna performance, but since the center frequency is easily changed according to the mounting conditions of the built-in antenna, it should be wideband because it needs to cover enough margin to 2,400 ~ 2,483.5MHz used for Bluetooth.

Second, it should be a miniaturized internal antenna in that it should be embedded in a space where there is little room for additional components such as a mobile phone and a notebook PC.

Third, the price should be low in terms of widespread use of Bluetooth.

The characteristics of the microchip antenna 100 according to the present invention that can satisfy the above conditions will be described in more detail below.

12 is a graph showing return loss with respect to the frequency of the microchip antenna 100 according to the present invention.

As shown in FIG. 12, the service band of the microchip antenna 100 according to the present invention is 2.400 to 2.4835 GHz, and the bandwidth of the microchip antenna 100 is 835 MHz or more, thereby confirming that a wide bandwidth can be realized. Therefore, it can be more easily employed in personal mobile communication or a Bluetooth service band requiring a bandwidth of at least 83.5 MHz.

That is, in the microchip antenna 100 of the present invention, the return loss of at least the frequency band 2.400 GHz to 2.4835 kHz required by Bluetooth (actually 2.400 to 2.4835 GHz in FIG. 12) is implemented to be -10 dB or less, so that The loss is very good, and the bandwidth is maintained at a wide width of about 835 MHz so that it can be utilized for a mobile communication or a Bluetooth service band.

FIG. 13 is a graph showing the standing wave ratio (VSWR) with respect to the frequency of the microchip antenna 100 according to the present invention, and shows that the maximum standing wave ratio is 1: 1.0310 to 1.1046 for the resonance impedance of 50Ω in the operating frequency band of the Bluetooth. Giving.

In other words, when the standing wave ratio in the microchip antenna 100 is 1, the standing wave ratio in the marker 1 is represented by 1.1046 and the frequency at this time is 2.400 kHz. In addition, the standing wave ratio of the marker 2 is 1.0310, the frequency is 2.442 kHz, the standing wave ratio of the marker 3 is 1.1086, and the frequency is 2.4835 kHz, respectively. This state is 835 (2.4835 ㎓-2.400 kHz) MHz. It can be seen that the standing wave ratio with respect to the resonance impedance of 50Ω in the bandwidth is very well implemented, which further amplifies the utilization in the Bluetooth service band.

In addition, the radiation gain of the microchip antenna 100 of the present invention must be efficient radiation in order to transmit and receive with the portable communication or notebook PC, for this purpose -1 ~ 2dB of the omnidirectional measurement as measured in the electromagnetic anechoic chamber A copy gain was obtained.

14 is a Smith chart for explaining the microchip antenna 100 according to the present invention.

As shown in FIG. 14, when the resonance impedance is 50 Ω in the operating frequency band of Bluetooth, the impedance is 47.506 Ω in marker 1, and the frequency is 2.400 kHz. In addition, it can be seen that the impedance at the marker 2 is 51.412 Ω, the frequency is 2.442 kHz, the impedance at the marker 3 is 48.516 Ω, and the frequency is 2.4835 kHz, and this state is 835 (2.4835 kHz-2.400 kHz) MHz. The resonance impedance in the bandwidth is 47.506 to 51.412Ω as a whole, and the resonance impedance in the marker 1, the marker 2 and the marker 3 is an approximation of 50Ω, further increasing the useful value in the Bluetooth service band.

15 is a radiation pattern for explaining the microchip antenna 100 according to the present invention.

Since the microchip antenna 100 according to the present invention implements an omnidirectional radiation pattern as shown in FIG. 15, transmission and reception at any position can be solved and a directional problem can be solved. In this case, the measurement of the microchip antenna 100 of the present invention should be performed in the anechoic chamber without electrical obstacles and in the field where there are no obstacles within 50m of the front and rear, and thus, in this self-test, the measurement was made in the anechoic chamber and each marker As a result of measuring the radiation pattern of the main and interfering surface of the point, it can be seen that the radiation patterns of the main and interfering planes at each measurement frequency are omnidirectional, which is very suitable as an antenna for transmission and reception in the Bluetooth service band.

As described above, the microchip antenna 100 according to the present invention can obtain a return loss of -10dB or less over a wide band, and has a good standing wave ratio of 1: 1.0310 to 1.1046 or less, and an input impedance of approximately 50 kHz, and radiation. The pattern is made in all directions and can be used as a transmitting / receiving antenna of flying objects such as rockets, missiles and aircrafts from mobile terminals and Bluetooth, and an oscillator, amplifying circuit, variable attenuator, switch, and modulator. Can be designed on the substrate 200 with modules in solid state such as mixers, mixers, phase shifters, etc., and can be used for personal mobile communication services and wireless subscriber network services using cellular phones and personal communication services (PCS). (Wireless Local Looped), Flims (Future Public Land Mobile Telecommunication System), IMT-2000 and satellite communications It may be very readily be used to send and receive signals between a wireless LAN or a mobile terminal.

In particular, the microchip antenna 100 according to the present invention can not only have a wide range of frequency bandwidth, but also can improve the gain by reducing the leakage current, and can improve the standing wave ratio, so that the microchip antenna 100 can be embedded in various communication equipments in a small size. It has an excellent effect.

Claims (1)

A feeding hole 20 which is bored in one side in the width direction of the dielectric 10 forming a rectangular shape and plated with a conductor 21; An upper pad (31) covered with a full width (W) as a length (L1) of 2 to 4% from one end of the entire length (L) of the upper surface of the dielectric (10); A lower pad 32 covering the entire width W while being shorted to the upper pad 31 with a length L2 of 2 to 4% from one end of the entire length L of the lower surface of the dielectric 10; A slot 40 stripped to the full width W with a length L3 of 2 to 4% from the upper pad 31 with respect to the total length L of the upper surface of the dielectric 10; 10) 10 to the total length (l) and the total width (W) of the upper surface of the dielectric 10 from the side where the feed hole 20 is located at an intermediate point between the other end of the upper surface and the slot 40, respectively. A top surface of the dielectric 10 on the opposite side where the center strip line 51 is stripped with a length? 4 of 15% and a width W1 of 60-80%, and the feed hole 20 is located; On both sides of the center stripline 51 as lengths (L5, L6) and widths (W2, W3) of 10 to 15%, respectively, and widths (W2, W3) of the total length (L) and the total width (W), respectively. A radiation patch 60 implemented by a stripped first array strip line 52 and a second array strip line 53; The total length L of the lower surface of the dielectric 10 is shorted to the radiation patch 60 at a length L7 of 4 to 8% from the other end thereof, and is covered with the entire width W and at the same time the power supply hole 20 to a width W4 of 8 to 12% of the total width W of the bottom surface of the dielectric material 10 from the lower side of the dielectric pad 10, spaced apart from the lower pad 32 by 8 to 12% of length L8. Microchip antenna (100), characterized in that it comprises a ground plane (70) extending to a position.