KR100632991B1 - Built-in patch antenna and method for manufacturing it - Google Patents

Abstract

A built-in patch antenna connected to an internal electronic circuit of a mobile phone and a method for manufacturing the same are provided to control an EMI feature by adjusting a dimension of a feeder without changing a patch radiator. A built-in patch antenna is connected to an internal electronic circuit of a mobile phone to demodulate a radio signal into data and modulate the data into the radio signal. The built-in patch antenna includes a patch radiator(110) for transmitting and receiving a radio signal at a resonance frequency, and a feeder(120) connecting the patch radiator with the internal electronic circuit(150). The feeder has a sufficient length for tuning. The feeder is formed in a zigzag shape of which a portion is folded at once, or a coil shape.

Description

Built-in patch antenna and method for manufacturing the same

1 is a top view and a front view of a built-in patch antenna for a mobile phone according to the prior art,

2 is a top view and a front view of a built-in patch antenna for a mobile phone according to the first embodiment of the present invention,

3 is a top view and a front view of a built-in patch antenna for a mobile phone according to a second embodiment of the present invention,

4A is a VSWR of a built-in patch antenna having a feeder line and a shorting line structure according to the prior art,

4B is a VSWR of a built-in patch antenna having a feed line and a short line structure according to a second embodiment of the present invention.

The present invention relates to a built-in patch antenna for a mobile communication terminal, and more particularly to a patch antenna that can adjust the length of the feed line of the built-in patch antenna.

Antennas currently generally mounted on various mobile communication terminals include a monopole antenna having a length of λ / 4 (λ is a wavelength of a used frequency) of a center frequency, and a corresponding electric length (λ / 4). Helical antennas, or retractable antennas that combine the two types of antennas.

However, the mobile communication terminal equipped with the above antennas has a disadvantage in that it is less convenient to carry and may be damaged due to the protruding antenna, so a built-in antenna for inserting the antenna into the terminal is required. It is becoming a trend.

On the other hand, the current mobile communication system is different in the frequency band used by each country or operator, the antenna used is inconvenient to be designed separately for each system. Accordingly, there is a need for an antenna having a multiband characteristic applicable to a plurality of systems.

Therefore, in order to meet such demands, an embedded antenna technology having a multi-band characteristic has been attempted at present. The microstrip patch antenna technology using a printed circuit technology, the ceramic chip antenna technology using a ceramic material of high dielectric materials, and many recent attempts Inverted F antenna technology.

1 shows a built-in antenna having a feed line of a typical patch antenna. The general patch type internal antenna shown in the drawing mainly uses a method of transmitting a signal by connecting a feed point on the radiator 310 and the ground surface with the internal circuit 350 at the shortest distance through the feed line 320, and a desired frequency. In order to generate resonance in a band, a slot (not shown) is formed in the radiator 310 to design an antenna. However, in this case, when the size of a given antenna is small, even if resonance occurs in a desired frequency band, when the frequency band is low (800 MHz, 900 MHz), it is not easy to secure a desired bandwidth, and due to the use of excessive slots, Can cause problems. In addition, in the case of the terminal antenna, the EMI condition of the terminal is changed from time to time in order to improve sensitivity and other RF characteristics, and the resonance frequency of the antenna is shifted from side to side whenever the EMI condition is changed. At this time, in order to correct the electrical length of the antenna, the electrical length of the antenna is adjusted by cutting or extending the patch of the end portion of the main radiator 310 of the antenna. There is a big problem that the shape is completely different from the or the radiation 310 direction is concentrated to one side, which adversely affects the antenna radiation pattern.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a built-in antenna capable of tuning a frequency bandwidth and / or an electric length value by adjusting a size of a feed line without changing a patch-type copy.

Another object of the present invention is to provide an internal antenna that can alleviate the use of an excessive slot for impedance matching in the case of an inverted F internal patch antenna.

The built-in patch antenna of the present invention for achieving the above object, in the mobile phone built-in antenna which is feed-connected with the mobile phone internal electronic circuit for demodulating the data from the wireless signal, and modulating the data to be transmitted to the wireless signal, at least one resonance A planar radiator for transmitting and receiving the radio signal at a frequency; And at least one feed line connecting the radiator and the electronic circuit inside the mobile phone, the feed line having a margin for tuning.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

(Example 1)

The internal antenna of the present embodiment as shown in FIG. 2 is a mobile phone internal antenna that is feed-connected with a mobile phone internal electronic circuit for demodulating data from a wireless signal and modulating the data to be transmitted into a wireless signal. Patch type radiator 110 for transmitting and receiving the radio signal at the resonant frequency; And a feeder line 120 connecting the patch-type copying body 110 and the mobile phone internal electronic circuit 150 and having an extra length for tuning.

The patch-type radiator 110 is for emitting (copying) an electrical signal supplied from the electronic circuit 150 inside the mobile phone through the feeder line 120 as an electromagnetic wave (electromagnetic wave), and a specific resonance frequency at which the signal is radiated. Have one or more The patch-type radiator 110 may have various two-dimensional or three-dimensional shapes according to a desired radiation pattern and a resonance frequency.

The feeder line 120 has an outer shape in the form of a conductor connecting the patch-type copying body 110 and the mobile phone internal electronic circuit 150, but does not merely perform a function for connecting the circuits, but the feeder line 120 itself. It will have a significant magnitude of impedance for the electromagnetic signal. In addition, the impedance change of the feed line 120 may affect the overall operating characteristics of the antenna, thereby bringing adjustments to parameters such as frequency bandwidth or amplification degree. The feed line 120 of the present embodiment has an extra length that can be removed for tuning the antenna characteristics, so that tuning can be performed to have desired characteristics when the mass production of the patch-type antenna or when mounted on the mobile phone. The tuning is carried out in a manner that cuts the feedline 120 with the extra length to an appropriate length to meet the desired antenna characteristics, which are primarily EMI limitations. The feed line 120 preferably has a zig-zag shape or a coil shape that is folded one or more times so that there is no inconvenience in installing the mobile phone even when the length of the cut is various during the tuning.

Tuning of the patch-type antenna according to the present embodiment at the time of manufacture of the antenna is performed as follows.

The mobile communication service provided by each communication service company has a communication channel of a predetermined frequency band for mobile communication. For example, an A communication service having a channel of 800 MHz, a B communication service having a channel of 1.5 GHz, and a C communication service having a channel of 1.6 GHz may be provided. On the other hand, various types of mobile communication terminals (ie, mobile phones) for use in each communication service are manufactured and used. For example, a, b, c type mobile phone is used for the A communication service, l, m, n type mobile phone is used for the B communication service, and s, t type mobile phones may be used for the C communication service. will be.

In order to manufacture the patch-type antenna of the present embodiment by reducing the production cost and simplifying the process in the manufacturing company of the mobile phone antenna, first of all have a shape and dimensions suitable for the desired resonant frequency and radiation pattern for each communication channel frequency. Preparing a patch-type copy (S120); It is preferable to perform the manufacturing process by dividing the feed line having a different length according to the mobile communication terminal of each type used in each communication channel (S140) to the patch-type copy.

That is, in step S120, the patch-type antenna according to the present embodiment is adjusted in a large range to suit the communication channel frequency used in the mobile communication service, and the patch-type antenna manufactured as a result of performing this step is heterogeneous having the same communication channel frequency. Commonly applied in the terminal.

On the other hand, in step S140, the patch antenna according to the present embodiment is adjusted or tuned in a fine range so as to be suitable for each type of mobile communication terminal used for each communication channel. This is because even in a mobile communication terminal having the same communication channel, there is a slight difference in the input impedance of the internal circuit, so that the characteristics of the patch antennas installed in each mobile communication terminal are slightly different. When the patch antenna according to the present embodiment is implemented, an antenna having a patch-type radiator having the same shape and dimensions for each communication channel frequency can be used for various types of mobile communication terminals by changing only the length of the feeder line. Cost savings due to integration and simplification can be achieved.

The step S140 again, manufacturing a feeder to be connected to the patch-type copy (S140); Adjusting the length of the feed line according to each type of mobile communication terminal used for each communication channel (S160); And connecting the feed line to the patch-type copy (S180).

(Example 2)

The internal antenna of the present embodiment as shown in FIG. 3 is one or more resonances in a mobile phone internal antenna which is feed-connected with a mobile phone internal electronic circuit for demodulating data from a wireless signal and modulating the data to be transmitted into a wireless signal. Patch type copy 210 for transmitting and receiving the radio signal at a frequency; A slot 240 formed by etching the patch-type radiator 210 such that the patch-type radiator 210 has two or more resonant frequencies; A feed line 220 connecting the patch-type copying body 210 and the mobile phone internal electronic circuit 250 to transmit a transmission signal, and having a margin length for tuning; And a short line 230 which connects the patch-type radiator 240 and the mobile phone internal electronic circuit 250 to short-circuit the current classified by the slot 240 and has a margin for tuning. It is done.

The patch-type radiator 210 is for emitting (copying) an electrical signal supplied from the electronic circuit 250 inside the mobile phone through the feeder line 220 as an electromagnetic wave (electromagnetic wave), and a specific resonance frequency at which the signal is radiated. It includes one or more slots 240 to have two or more. The slot 240 refers to a region removed in a line shape of the patch-type copy. The current flowing through the patch-type radiator 210 is divided into two by the slot 240 and thus the patch-type radiator 210 causes resonance at two frequencies (a first resonant frequency and a second resonant frequency). The number of slots 240 may be implemented in two or more according to the resonance characteristics and the number of resonant frequencies, and may be implemented in various shapes in addition to the "-" shape as shown. In addition, the patch-type radiator 210 may have various two-dimensional or three-dimensional shapes according to the desired radiation pattern and the resonance frequency.

The feeder 220 has an outer shape in the form of a conductor connecting the patch-type copy 210 and the electronic circuit 250 inside the mobile phone, but does not merely perform a function for connecting the circuit, but the feeder 220 itself. It will have a significant magnitude of impedance for the electromagnetic signal. In addition, the impedance change of the feed line 220 may affect the overall operating characteristics of the antenna, thereby bringing adjustments to parameters such as frequency bandwidth or amplification degree. The feeder line 220 of the present embodiment has an extra length that can be removed to tune the antenna characteristics, so that tuning can be performed to have desired characteristics when the patch-type antenna is finally produced or mounted on a mobile phone. The tuning is performed in such a way as to cut the feedline 220 with the extra length to an appropriate length to meet the desired antenna characteristics, which are primarily EMI limitations. The feed line 220 preferably has a zigzag shape or a coil shape that is folded one or more times so that there is no inconvenience in installing the mobile phone even when the length is long because the cutting line 220 is not cut off a little.

The short circuit 230 is for determining the first resonant frequency, and is the length (preferably the first) of the patch-type radiator 210 bypassing the slot 240 from the feed line 220 to the short circuit 230. 1/4 of the resonant frequency wavelength) determines the first resonant frequency. Like the feeder line 220, the shorting line 230 has an extra length for tuning, and the method and the preferred shape of the shorting line 230 are similar to those of the shorting line 230, and thus description thereof will be omitted.

In addition, the longer feed line 220 and the short line 230 of the present embodiment shifts the resonant frequency of the patch antenna. For the same patch type radiator 210, FIG. 4A is a VSWR representing a resonant frequency in a patch antenna with a conventional short length feed line and a short line, and FIG. VSWR indicating the resonance frequency of the patch antenna. In the figure, it can be seen that the case of FIG. 4B connecting the feed line and the short line having the extra length has excellent performance in generating resonance at a lower frequency than the conventional case. In the illustrated case, it can be seen that the resonance frequencies of 900 MHz and 1800 MHz in the prior art are all lowered by about 50 MHz or more by the feeder and the short circuit. The resonant frequency is horizontally shifted so that there is no significant advantage compared to the prior art except for the frequency adjustment effect, but the bandwidth was about 8-9% based on VSWR, which is applied to the longer feed line 220 and the short circuit 230 according to the present embodiment. It can be seen that the improvement by about 10%.

On the other hand, when the slot 240 of the present embodiment is formed between the feed line 220 and the short line 230, as shown in the drawings, the sufficient extra length of the feed line 220 and the short line 230 itself is described above. In addition to the tuning effect and the impedance of the impedance effect of the antenna also brings the following effects.

The patch-type antenna of the present embodiment has two resonant frequencies, and the two resonant frequencies are represented by the slots 240 separating the patch-type radiators. Depending on the clearer separation of the two resonant frequencies or other desired electromagnetic radiation characteristics, the slot length may be required to be long enough, which makes the manufacturing difficult, increasing manufacturing costs, tuning for EMI, etc. Makes it difficult. However, in the present embodiment, the feed line 220 and the short line 230 have a sufficient extra length, during which the gap between the feed line 220 and the short line 230 plays a part of the slot. As a result, the slot 240 has a length that can be shortened. In order to increase the effects as described above, the shape of the feed line 220 and the short-circuit line 230 having an extra length can be produced in parallel with each other.

Tuning of the patch-type antenna according to the present embodiment at the time of manufacture of the antenna is performed as follows.

In the case of the present embodiment also, in order to manufacture a patch-type antenna of this embodiment by reducing the production cost and simplifying the process in the antenna manufacturing company, first, the shape and dimensions suitable for the desired resonant frequency and radiation pattern for each communication channel frequency. Producing a patch-type copy having a (S120); It is preferable to perform a manufacturing process by dividing a feed line and a short line having different lengths according to the mobile communication terminals of the respective models used in the respective communication channels (S140).

That is, in step S120, the patch-type antenna according to the present embodiment is adjusted in a large range to suit the communication channel frequency used in the mobile communication service, and the patch-type antenna manufactured as a result of performing this step is heterogeneous having the same communication channel frequency. Commonly applied in the terminal.

On the other hand, in step S140, the patch antenna according to the present embodiment is adjusted or tuned in a fine range so as to be suitable for each type of mobile communication terminal used for each communication channel. This is because even in a mobile communication terminal having the same communication channel, there is a slight difference in the input impedance of the internal circuit, so that the characteristics of the patch antennas installed in each mobile communication terminal are slightly different. When the patch antenna according to the present embodiment is implemented, an antenna having a patch-type radiator having the same shape and dimensions for each communication channel frequency can be used for various types of mobile communication terminals by changing only the length of the feed line and the short line, thereby manufacturing the patch antenna. Cost savings due to process integration and simplification can be achieved.

The step S140 again, manufacturing a feed line and a short line to be connected to the patch-type copy (S140); Adjusting the length of the feed line and the short line in accordance with each type of mobile communication terminal used for each communication channel (S160); And connecting the feed line and the short line to the patch-type copy (S180).

Although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the claims to be described below by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents.

By implementing the built-in patch antenna according to the present invention, by controlling the dimensions of the feed line and / or short line without changing the patch-type radiant, there is an effect that can adjust the EMI characteristics.

In addition, in the case of a patch antenna having a slot such as an inverted-F antenna, the slot length and / or complexity may be alleviated.

Claims (7)

A built-in patch antenna connected to an electronic circuit inside a mobile phone for demodulating data from a wireless signal and modulating the data to be transmitted into a wireless signal, A patch type radiator for transmitting and receiving the radio signal at one or more resonant frequencies; And A feed line connecting the patch-type copy with the internal electronic circuit of the mobile phone and having a free length for tuning Built-in patch antenna comprising a. The method of claim 1, wherein the feed line, Zigzag-shaped patch antenna that is folded one or more times. The method of claim 1, wherein the feed line, Built-in patch antenna in coil shape. A mobile phone internal antenna connected to an electronic circuit inside a mobile phone for demodulating data from a wireless signal and modulating data to be transmitted into a wireless signal, Patch type copy for transmitting and receiving the radio signal; A slot formed by etching the patch-type radiator such that the patch-type radiator has two or more resonance frequencies; A feed line connecting the patch-type copy and the electronic circuit inside the mobile phone to transmit a transmission signal, the feed line having a margin for tuning; And The patch-type radiator connects the internal electronic circuit of the cellular phone to short-circuit the current classified by the slot, and has a short line having a free length for tuning. Built-in patch antenna comprising a. The method of claim 4, wherein the feed line and / or the short line, Zigzag-shaped patch antenna that is folded one or more times. The method of claim 1, wherein the feed line and / or the short circuit line, Built-in patch antenna in coil shape. Manufacturing a patch-type radiator having a shape and dimensions suitable for a desired resonant frequency and radiation pattern for each communication channel frequency (S120); And Connecting feed lines and / or short lines having different lengths according to the mobile communication terminals of respective models used in the communication channels (S140); Method of manufacturing a patch-type antenna comprising a.

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