KR100973850B1 - Sticker antenna by fpcb and a manufacturing process method - Google Patents

Abstract

The present invention relates to an FPCB sticker antenna and a method of manufacturing the same, wherein an antenna element copper foil pattern 131 and a ground copper foil pattern 130 are formed between the first and second FPCB substrates 110 and 120, and one side of the second FPCB substrate 120 is provided. An antenna base 100 having first and second square grooves 121 and 122 formed therein and a double-sided tape 150 formed on a lower surface thereof; A copper foil pattern 230 is formed between the third and fourth FPCB substrates 210 and 220, and a double-sided tape 250 is provided on a lower surface of the third and fourth FPCB substrates 210 and 220, and an antenna SUB 200 attached to an upper surface of the second FPCB substrate 120. ; First to third peeling parts 301, 302, and 303 are formed so that one end forms a layer, and the first peeling part 301 is positioned in the first square groove 121 of the second FPCB substrate 120, and the third peeling part ( 303 is located in the second square groove 122 is fixed by soldering, and the other end is composed of a coaxial cable 300 provided so that the RF connector 310 is directed upward. Accordingly, the present invention configures a dual band antenna by configuring an FPCB antenna SUB using a wavelength of 1800 MHz DCS frequency band on an FPCB antenna base using a wavelength of 900 MHz GSM frequency band using an FPCB substrate, and applying an antenna in a smaller area. In order to be able to use a sticker attached to the communication terminal cover for the purpose, there is an effect that can be transmitted and received in the GSM and DCS bands.

Description

FPCB sticker antenna and its manufacturing method {Sticker Antenna by FPCB and A Manufacturing Process Method}

The present invention relates to an FPCB sticker antenna and a method for manufacturing the same, and more particularly, to a FPCB sticker antenna and a method for manufacturing the same for CDMA, GSM, DCS and antennas for communication of 800MHz or more.

In general, the antenna used in the mobile phone has a limit in miniaturization because of its high area ratio.

Due to the characteristics of the antenna that must be followed according to the wavelength of the CDMA frequency band and European GSM frequency band and DCS frequency band used in Korea, there is no limit to the size, so there is a lot of difficulty in miniaturizing the antenna and eventually miniaturizing the antenna. This problem remains the most important problem that limits the miniaturization of communication terminals.

Accordingly, there is a need for an antenna of a type suitable for home use in a situation in which the need for a smaller volume antenna is increasing in accordance with the miniaturization of a communication terminal.

In order to solve the above problems, in the present invention, an FPCB antenna SUB using a wavelength of 1800 MHz DCS frequency band is configured on an FPCB antenna base using a wavelength of 900 MHz GSM frequency band that is basically used using an FPCB substrate to form a dual band. Provides an FPCB sticker antenna and its manufacturing method which can transmit and receive in GSM and DCS bands by constructing an antenna (Dual Band Antenna), and can be used by sticking to the cover of the communication terminal to apply the antenna in a smaller area. The purpose is to.

In order to achieve the object, the antenna element copper foil pattern and the ground copper foil pattern are formed between the first and second FPCB substrates, the first and second square grooves are formed on one side of the second FPCB substrate, and the double-sided tape is provided on the lower surface. An antenna base; An antenna SUB having a tuning copper foil pattern formed between the third and fourth FPCB substrates, and having a double-sided tape provided on the lower surface thereof, the antenna SUB being attached to the upper surface of the second FPCB substrate; First to third stripping portions are formed so that one end forms a layer, the first stripping portion is positioned in the first square groove of the second FPCB substrate, and the third stripping portion is positioned in the second square groove and fixed by soldering, and the other end is RF It consists of a coaxial cable provided with the connector facing upwards.

In another configuration of the present invention, the antenna element copper foil pattern and the ground copper pattern of the antenna base are formed to have a wavelength of 900 MHz, which is a GSM frequency band, and the copper foil pattern of the antenna SUB has a wavelength of 1800 MHz, which is a DCS frequency band. It is formed of two matching taps.

In order to achieve the object, a double-sided tape is attached to a lower surface of the first FPCB substrate, and an antenna element copper foil pattern and a ground copper pattern are formed on the upper surface, and then the antenna base is covered by covering the second FPCB substrate having the first and second square grooves. A first step of constructing; Attaching a double-sided tape to the lower surface of the third FPCB substrate, forming a tuning copper foil pattern formed of two matching taps on the upper surface, and covering the fourth FPCB substrate to form an antenna SUB; The first and third stripping portions of the coaxial cable having first and third stripping portions so that one end forms a layer on the first and second square grooves of the second FPCB substrate are fixed to the first and second square grooves by soldering, A third step of fixing the RF connector upward; After the coaxial cable is fixed to the antenna base, using a double-sided tape of the bottom surface of the third FPCB substrate, attaching the antenna SUB to the antenna base upper surface to complete the FPCB sticker antenna.

According to another method of the present invention, the antenna element copper foil pattern and the ground copper pattern of the antenna base are formed to have a wavelength of 900 MHz, which is a GSM frequency band, and the copper foil pattern of the antenna SUB has a wavelength of 1800 MHz, which is a DCS frequency band. It is formed of two matching taps, the two frequency bands are formed in the form of a matching network.

As described above, the present invention configures a dual band antenna by configuring an FPCB antenna SUB using a wavelength of 1800 MHz DCS frequency band on an FPCB antenna base using a wavelength of 900 MHz GSM frequency band basically used using an FPCB substrate. Antenna), and can be attached to the communication terminal cover to be used as a sticker for the application of the antenna in a smaller area, thereby transmitting and receiving in the GSM and DCS bands.

In addition, it has a smaller volume than the CAVITY antenna, WIRE antenna, and WHIP antenna, which are generally applied to portable communication terminals, so that portable communication terminals can be miniaturized, and antennas can be designed using FPCB and double-sided tapes can be used. Since it is attached to the cover or body of the communication terminal in the form of a sticker, there is an effect that can minimize the process even in assembly.

1 is a perspective view of an FPCB sticker antenna according to the present invention, FIG. 2 is an exploded view of an FPCB sticker antenna according to the present invention, FIG. 3 is a plan view of an FPCB sticker antenna according to the present invention, and FIG. 4 is an FPCB according to the present invention. Figure 5 is a side view of a sticker antenna, Figure 5 is a reference diagram showing a radiation characteristic measurement method of the FPCB sticker antenna according to the present invention, Figure 6 is a reference diagram showing the radiation characteristic of the FPCB sticker antenna according to the present invention, Figure 7 It is a reference figure which shows the standing wave ratio characteristic graph of the FPCB sticker antenna which concerns on this invention.

Hereinafter, the components will be described with reference to the drawings.

1 and 2 are a perspective view and an exploded view of the FPCB sticker antenna of the present invention, which is composed of an antenna base 100, an antenna SUB 200, and a coaxial cable 300.

The antenna base 100 has an antenna element copper foil pattern 131 and a ground copper foil pattern 130 formed between the first and second FPCB substrates 110 and 120, and first and second square grooves on one side of the second FPCB substrate 120. (121,122) is formed, the lower surface is provided with a double-sided tape (150).

The antenna SUB 200 has a copper foil pattern 230 formed between the third and fourth FPCB substrates 210 and 220, and a double-sided tape 250 is provided on a lower surface thereof and attached to an upper surface of the second FPCB substrate 120. do.

The antenna element copper foil pattern 131 and the ground copper foil pattern 130 of the antenna base 100 are formed to have a wavelength of 900 MHz, which is a GSM frequency band, and the tuning copper foil pattern 230 of the antenna SUB 200 is a DCS frequency. Two matching taps are formed to have a wavelength of 1800 MHz, which is a band.

The coaxial cable 300 has first to third stripping parts 301, 302, and 303 formed so that one end forms a layer, and the first stripping part 301 is positioned in the first square groove 121 of the second FPCB substrate 120. The third stripping part 303 is positioned in the second square groove 122 and fixed by soldering, and the other end is composed of a coaxial cable 300 having the RF connector 310 facing upward.

In addition, the antenna base 100 is formed of 24mm vertical, 40mm horizontal, the antenna SUB 200 is formed of 13mm vertical, 27mm horizontal, in the stripping of the coaxial cable 300, the first stripping portion 301 The stripping length is 2 mm, the stripping lengths of the second and third stripping portions 301 and 302 are each 1 mm, and the total length of the coaxial cable 300 is 78 mm.

The lengths of the portions of the first square groove 121 and the second square groove 122 of the antenna base 100 to which the first skin 301 and the third skin 303 are fixed by soldering are also determined. 2 mm and 1 mm, which is the same as the first peeling part 301 and the third peeling part 303, and the spacing between the first square groove 121 and the second square groove 122 is also the same as that of the second peeling part 302. It is formed in 1 mm.

3 is a plan view of an FPCB sticker antenna according to the present invention, in which an antenna element copper foil pattern 131 and a ground copper foil pattern 130 are provided below the second FPCB substrate 120 and the first, It can be seen that the first and third stripping portions 301 and 303 of the coaxial cable 300 are positioned on the two square grooves 121 and 122, and the RF connector 310 of the coaxial cable 300 is positioned upward.

In addition, a copper foil pattern 230 formed of two matching taps is provided on the lower surface of the second FPCB substrate 120, and is provided on the lower surface of the third FPCB substrate 210, not shown. The double-sided tape 250 is attached to the upper surface of the second FPCB substrate 120.

4 is a side view of the FPCB sticker antenna according to the present invention, the antenna element copper foil pattern 131 and the ground copper foil pattern 130 is formed between the first and second FPCB substrates 110 and 120 of the antenna base 100, the antenna SUB It can be seen that the copper foil pattern 230 is formed between the third and fourth FPCB substrates 210 and 220 of (200), and the first FPCB substrate 110 of the antenna base 100 and the third FPCB substrate of the antenna SUB 200 ( 210, the lower surface of each of the double-sided tape (150, 250) is provided, the antenna SUB (200) is attached to the antenna base (100).

In the manufacturing method of the FPCB sticker antenna of the present invention configured as described above, the double-sided tape 150 is attached to the lower surface of the first FPCB substrate 110, and the antenna element copper foil pattern 131 and the ground copper foil pattern 130 on the upper surface. After forming the first and second square grooves 121 and 122, the first step (S10) forming the antenna base 100 to cover the second FPCB substrate 120, and the double-sided tape on the lower surface of the third FPCB substrate 210 A second step (S20) of forming an antenna SUB 200 by attaching 250 and forming a copper foil pattern 230 formed of two matching taps on an upper surface thereof to cover the fourth FPCB substrate 220; The first and third stripping portions 301 and 303 of the coaxial cable 300 having the first to third stripping portions 301, 302 and 303 so that one end forms a layer in the first and second square grooves 121 and 122 of the second FPCB substrate 120. Positioned in the first and second square grooves (121, 122) and fixed by soldering, the third step (S30) is fixed so that the RF connector 310 of the other end to the top, and the coaxial k After the 300 is fixed to the antenna base 100, the antenna SUB 200 is attached to the top surface of the antenna base 100 by using the double-sided tape 250 of the bottom surface of the third FPCB substrate 210. Comprising a fourth step (S40) to complete the antenna.

In the measurement experiment of the FPCB sticker antenna of the present invention, the frequency and the VSWR are measured using a network analyzer after mounting in a communication terminal SET, and the gain is measured in an anechoic chamber.

5 is a reference diagram showing a method of measuring the radiation characteristics of the FPCB sticker antenna according to the present invention, Figure 6 is a reference diagram showing the radiation characteristics of the FPCB sticker antenna according to the present invention.

FIG. 5 (a) illustrates a method of measuring antenna gain for each azimuth angle based on an antenna. FIG. 6 (a) illustrates antenna gain values for each azimuth angle. FIG. 5 (b) shows each antenna elevation based on an antenna. As a method of measuring the antenna gain for each antenna, an antenna gain value for each elevation is illustrated in FIG. 6 (b), and FIG. 5 (c) shows an antenna for each elevation based on an antenna of a different form from FIG. 5 (b). As a method of measuring gain, the antenna gain values for each elevation are shown in Fig. 6C.

Antenna gains compared to the azimuth or elevation angles according to FIGS. 5 and 6 are shown in Tables 1 to 3 below.

Antenna gain versus azimuth <see FIGS. 5 (a) and 6 (a)> Channel
GSM DCS 880 MHz 960 MHz 1720 MHz 1880 MHz Avg. (DBi) -5.42 -8.60 -3.73 -1.97 Max. (DBi) -4.06 -7.54 -0.14 3.08

Antenna gain over elevation <see FIGS. 5 (b) and 6 (b)> Channel
GSM DCS 880 MHz 960 MHz 1720 MHz 1880 MHz Avg. (DBi) -7.75 -11.37 -6.92 -3.54 Max. (DBi) -5.10 -8.47 -4.05 0.52

Antenna gain over elevation <see FIGS. 5 (c) and 6 (c)> Channel
GSM DCS 880 MHz 960 MHz 1720 MHz 1880 MHz Avg. (DBi) -8.02 -11.21 -4.96 -2.19 Max. (DBi) -4.09 -7.54 -0.14 3.08

7 is a reference diagram showing a standing wave ratio characteristic graph of the FPCB sticker antenna according to the present invention, Figure 7 (a) is a characteristic curve showing the standing wave ratio, Figure 7 (b) is a reference that shows the standing wave ratio in a Smith chart It is also.

Table 4 below shows the standing wave ratio and polarization characteristics according to FIG. 7.

-Standing wave ratio and polarization characteristics <see FIG. 6> Channel
GSM DCS 880 MHz 960 MHz 1720 MHz 1880 MHz VSWR 3.74 4.90 2.45 1.63 Max. (DBi) -4.09 -7.54 -0.14 3.08 Input impedance 50 ohm Polarization Vertical polarization Copy pattern Omni-directional

Accordingly, the present invention configures a dual band antenna by constructing an FPCB antenna SUB using a wavelength of 1800 MHz DCS frequency band on an FPCB antenna base using a wavelength of 900 MHz GSM frequency band basically used by using an FPCB substrate. In addition, to apply to the antenna cover in a smaller area to be used as a sticker attached to the communication terminal cover, it is possible to transmit and receive in the GSM and DCS band.

The antenna element copper foil pattern 131 of the antenna base 100 of the present invention has a shape by calculating the wavelength based on the 900MHz GSM frequency band, which can be applied to 1/8 wavelength at 1/4 wavelength, The antenna element q / copper pattern and the ground copper pattern 130 have a strip antenna structure, and are formed by merging the structures of the PIFA antenna.

In particular, since the FPCB substrate, which is difficult to have a strip antenna structure in which the ground structure should be formed in the opposite direction of the antenna, is used, the ground has a structure of a PIFA antenna, and the DCS frequency band is 1,800, which is twice the frequency of the GSM band. Since the wavelength has a length of 1/2 of the GSM frequency band because it is a MHz band, the antenna SUB 200 uses a tuning copper foil pattern 230 to serve as a short-capacitor so that the antenna can be adapted to the 1,800 MHz band. Is formed.

Although the present invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

1 is a perspective view of an FPCB sticker antenna according to the present invention.

2 is an exploded view of the FPCB sticker antenna according to the present invention.

3 is a plan view of an FPCB sticker antenna according to the present invention;

4 is a side view of an FPCB sticker antenna according to the present invention;

5 is a reference diagram showing a method of measuring the radiation characteristics of the FPCB sticker antenna according to the present invention.

6 is a reference diagram showing the radiation characteristics of the FPCB sticker antenna according to the present invention.

7 is a reference diagram showing a standing wave ratio characteristic graph of the FPCB sticker antenna according to the present invention.

<Description of the symbols for the main parts of the drawings>

100 antenna base 110 first FPCB substrate

120: second FPCB substrate 121,122: first, second square groove

130: ground copper foil pattern 131: antenna element copper foil pattern

150: double-sided tape 200: antenna SUB

210: third FPCB substrate 220: fourth FPCB substrate

230: copper copper foil pattern 250: double sided tape

300: coaxial cable 301: first stripping part

302: second peeling skin 303: third peeling skin

310: RF connector

Claims (4)

FPCB sticker antenna, An antenna element copper foil pattern 131 and a ground copper foil pattern 130 are formed between the first and second FPCB substrates 110 and 120, and first and second square grooves 121 and 122 are formed at one side of the second FPCB substrate 120. An antenna base 100 having a double-sided tape 150 on a lower surface thereof; A copper foil pattern 230 is formed between the third and fourth FPCB substrates 210 and 220, and a double-sided tape 250 is provided on a lower surface of the third and fourth FPCB substrates 210 and 220, and an antenna SUB 200 attached to an upper surface of the second FPCB substrate 120. ; First to third peeling parts 301, 302, and 303 are formed so that one end forms a layer, and the first peeling part 301 is positioned in the first square groove 121 of the second FPCB substrate 120, and the third peeling part ( 303 is located in the second square groove 122 is fixed by soldering, the other end of the FPCB sticker antenna, characterized in that consisting of a coaxial cable 300 is provided so that the RF connector 310 is directed in the upper direction. The method of claim 1, The antenna element copper foil pattern 131 and the ground copper foil pattern 130 of the antenna base 100 are formed to have a wavelength of 900 MHz, which is a GSM frequency band, and the tuning copper foil pattern 230 of the antenna SUB 200 is a DCS frequency. An FPCB sticker antenna, characterized in that formed of two matching taps to have a wavelength of 1800 MHz. In the FPCB sticker antenna manufacturing method, After the double-sided tape 150 is attached to the lower surface of the first FPCB substrate 110 and the antenna element copper foil pattern 131 and the ground copper foil pattern 130 are formed on the upper surface, first and second square grooves 121 and 122 are formed. A first step (S10) of covering the 2FPCB substrate 120 to configure the antenna base 100; After attaching the double-sided tape 250 to the lower surface of the third FPCB substrate 210, and forming a copper foil pattern 230 formed of two matching taps on the upper surface, the fourth FPCB substrate 220 is covered to cover the antenna SUB 200. A second step S20 of constructing a; The first and third stripping portions 301 and 303 of the coaxial cable 300 having the first to third stripping portions 301, 302 and 303 so that one end forms a layer in the first and second square grooves 121 and 122 of the second FPCB substrate 120. A third step (S30) positioned in the first and second square grooves 121 and 122 and fixed by soldering, and the RF connector 310 of the other end is fixed upward; After the coaxial cable 300 is fixed to the antenna base 100, the antenna SUB 200 is attached to the antenna base 100 by using the double-sided tape 250 of the bottom surface of the third FPCB substrate 210. FPCB sticker antenna manufacturing method comprising the step (S40) of completing the FPCB sticker antenna. The method of claim 3, wherein The antenna element copper foil pattern 131 and the ground copper foil pattern 130 of the antenna base 100 are formed to have a wavelength of 900 MHz, which is a GSM frequency band, and the tuning copper foil pattern 230 of the antenna SUB 200 is a DCS frequency. 2. The method of manufacturing an FPCB sticker antenna, comprising: two matching taps having a wavelength of 1800 MHz, and the two frequency bands have a matching network shape.

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