KR20110057658A - Phase shifter where a slot is formed on a ground member and antenna including the same - Google Patents

Abstract

PURPOSE: A phase shifter with a slot on a ground unit and an antenna including the same are provided to reduce the leakage loss of an antenna at a usable frequency BY forming the slot in an area with an electric field over a reference value or area except for a pattern. CONSTITUTION: A housing member houses a phase shifter. The phase shifter includes a first substrate(210), a first pattern(214), and a ground unit. The first pattern is arranged on a first surface of the first substrate. The ground unit is arranged on a second substrate facing the first surface among the first substrate. The ground unit faces a part of the housing member. A slot(230a,230b) is formed on a part of the ground unit.

Description

Phase shifter with a slot formed in the ground and an antenna including the same {PHASE SHIFTER WHERE A SLOT IS FORMED ON A GROUND MEMBER AND ANTENNA INCLUDING THE SAME}

The present invention relates to a phase shifter in which a slot is formed in the ground portion to reduce leakage loss, and an antenna including the same.

An antenna, in particular a base station antenna, is a device that receives power from the outside and outputs a specific radiation pattern.

1 is a view schematically showing a structure of a general antenna.

Referring to FIG. 1, the antenna 100 includes a phase shifter 102 and a housing member 104 housing the phase shifter 102.

The phase shifter 102 includes a substrate 110, a conductor pattern 112, and a ground portion 114.

The conductor pattern 112 is formed on the upper surface of the substrate 110, and the ground portion 114 is formed on the lower surface of the substrate 110.

In general, when there is no process error, the ground portion 114 is in close contact with the bottom surface of the housing member 104 such that there is almost no gap between the ground portion 114 and the housing member 104. However, due to a process error or the like, a gap is formed between the ground portion 114 and the housing member 104 to some extent as shown in FIG. 1, and a leakage current may be generated from the phase shifter 102. As a result, the leakage loss of the antenna can be increased.

In particular, the frequency band in which such leakage loss occurs (frequency due to the coupling between the ground portion 114 and the housing member 104) was more likely to exist within the available frequency band that the antenna intends to use. As a result, the user may not be able to use the available frequency band arbitrarily.

An object of the present invention is to provide a phase shifter and an antenna including the phase shifter implemented in a structure to reduce leakage loss.

In order to achieve the above object, an antenna according to an embodiment of the present invention is a phase shifter; And a housing member housing the phase shifter. The phase shifter may include a first substrate; At least one first pattern being a conductor arranged on a first side of the first substrate; And a ground portion arranged on a second surface of the first substrate, which is opposite to the first surface. Here, the ground portion faces a portion of the housing member, and a slot is formed in a portion of the ground portion.

According to another embodiment of the present invention, an antenna includes a phase shifter; And a housing member housing the phase shifter. The phase shifter may include a first substrate; At least one first pattern being a conductor arranged on a first side of the first substrate; And a ground portion arranged on a second surface of the first substrate, which is opposite to the first surface. Here, the ground portion faces a part of the housing member, and a frequency generated by the coupling between the ground portion and the housing member is present in a band outside the available frequency band of the antenna.

A phase shifter housed by a housing member according to an embodiment of the present invention may include a first substrate; First patterns being conductors arranged on a first side of the first substrate; A ground portion arranged on a second surface of the first substrate opposite to the first surface; A second substrate spaced apart from the first substrate by a predetermined distance; And second patterns arranged on the second substrate and facing the first patterns. Here, the second patterns electrically connect the first patterns to each other, and a slot is formed in a part of the ground portion.

In the phase shifter and the antenna including the same according to the present invention, at least one slot is formed in the ground portion formed on the lower surface of the substrate. In particular, the slot is formed in a portion of the ground portion other than a portion corresponding to a region in which patterns, which are signal lines formed on the substrate, are located, or is formed in a portion in which electric fields are above a reference value. As a result, the leakage loss of the antenna can be reduced in the available frequency band.

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

2 is a cross-sectional view schematically illustrating an antenna according to a first embodiment of the present invention, and FIG. 3 is a diagram illustrating a phase shifter of FIG. 2. 4 is a diagram illustrating an operation structure of the phase shifter of FIG. 2, and FIG. 5 is a diagram illustrating a graph comparing leakage loss according to a grounding structure.

Referring to FIG. 2, the antenna 200 of this embodiment includes a phase shifter 202, a housing member 204, and radiation elements (not shown).

The phase shifter 202 is a device that provides power (RF signal) input from the outside to the radiation elements, and changes the phase of the RF signals provided to the radiation elements.

According to one embodiment of the present invention, the phase shifter 202 includes a first sub phase shifter 206 and a second sub phase shifter 208.

The first sub phase shifter 206 may include a first substrate 210, at least one first pattern 214, at least one second pattern 216, and an input pattern 300 as shown in FIGS. 2 and 3. Distribution patterns 302 and 304, at least one fifth pattern 306, and at least one sixth pattern 308 and a ground portion 218.

The first patterns 214 are arranged on the first substrate 210 as a conductor, and may preferably be arranged sequentially in the horizontal direction with an inverted 'U' shape as shown in FIG. 3. Of course, the first pattern 214 may also be said to have a 'U' shape depending on the viewing angle. Here, the 'U' shape means all patterns consisting of a left pattern, a center pattern, and a right pattern, as will be described later.

In FIG. 3, all of the first patterns 214 have the same shape and size, but some may have different shapes or sizes.

The second patterns 216 are arranged over the first substrate 210 as a conductor, for example opposite the first patterns 214. Here, the second patterns 216 may have a 'U' shape.

The input pattern 300 is a portion to which power is supplied from the outside, for example, an inner conductor of a cable (not shown) for transferring power to an end portion of the input pattern 300 may be connected.

The distribution patterns 302 and 304 are electrically connected to the input pattern 300, the first pattern 214, and the second pattern 216, as shown in FIG. 3, supplied through the input pattern 300. Power is delivered to the first pattern 214 and the second pattern 216.

In FIG. 3, the distribution patterns 302 and 304 are connected to the leftmost of the first patterns 214 and the leftmost of the second patterns 216, but the patterns of different positions ( 214 and 216.

In addition, although the distribution patterns 302 and 304 are directly connected to the patterns 214 and 216, they may be connected in a coupling manner.

The fifth pattern 306 is formed on the first substrate 210 as a conductor, and electrically connects the first pattern 214 with the radiation element 310. As a result, the powers input to the first patterns 214 are provided to the radiation elements 310 through the respective fifth patterns 306, so that the radiation elements 310 emit beams in a specific direction. Output it.

The sixth pattern 308 is formed on the first substrate 210 as a conductor, and electrically connects the second pattern 216 with the radiation element 310. As a result, the powers input to the second patterns 216 are provided to the radiation elements 310 through the sixth patterns 308, respectively, so that the radiation elements 310 emit a beam in a specific direction. Generate.

According to one embodiment of the invention, at least some of the phases of the powers (RF signals) flowing in the fifth patterns 306 and the sixth patterns 308 may be different, preferably as described below. Can be changed with certain rules.

According to another embodiment of the present invention, at least one of the fifth patterns 306 and the sixth patterns 308 may have an impedance value different from that of the other fifth and sixth patterns. In another aspect, at least one of the patterns 306 and 308 may have a different size (width or length) than the other patterns. As a result, the sizes of the powers supplied to the respective radiating elements 310 may be different. The impedance or size of these patterns 306 and 308 will depend on the characteristics of the beam to be implemented.

The second sub phase shifter 208 includes a second substrate 212, at least one third pattern 220 and one or more fourth patterns 222.

The second substrate 212 is made of a dielectric material having a predetermined dielectric constant, and may have the same dielectric constant as the first substrate 210 or may have a different dielectric constant.

The third patterns 220 are conductors, for example, regularly formed on the second substrate 212. According to an embodiment of the present invention, the third pattern 220 may have a 'U' shape as shown in FIG. 3.

These third patterns 220 electrically connect the first patterns 214.

The fourth patterns 222 are conductors and are formed to face the third patterns 220 on the second substrate 212. According to an embodiment of the present invention, the fourth pattern 222 may have an inverted 'U' shape as shown in FIG. 3.

The fourth patterns 222 electrically connect the second patterns 216.

However, as long as the third patterns 220 and the fourth patterns 222 electrically connect the first patterns 214 and the second patterns 216, respectively, the structures of the patterns 220 and 222. 3 is not limited to the structure of FIG. 3 and may be variously modified.

Referring to the operation of the sub phase shifters 206 and 208 having the above structure, the second sub phase shifter 208 is spaced apart from the first sub phase shifter 206 by a predetermined distance as shown in FIG. 4. Furnace is placed on the first sub phase shifter 206 and moves linearly, for example, as shown in FIG. Of course, the first sub phase shifter 206 may be implemented to move with the second sub phase shifter 208 fixed. In addition, although the sub phase shifter 206 or 208 has moved linearly from above, it can move non-linearly, for example along a curved line. Of course, in this case, the shapes of the patterns included in the sub phase shifters 206 and 208 will be changed into curved shapes, for example, according to the nonlinear movement.

2 to 4, the ground portion 218 is formed on one surface of the first substrate 210, preferably on the surface opposite to the surface on which the first patterns 214 are formed.

According to one embodiment of the present invention, a slot (Slot, 230) may be formed in a part of the ground portion 218. That is, the ground portion 218 is not formed on the front surface of the first substrate 212 and is formed on the first substrate 212 with a portion removed.

The slot 230a may be formed at the center of the ground portion 218, or the slot 230b may be formed near the input pattern 300.

Preferably, the slot 230 is formed in the portion of the ground portion 218 where leakage loss can occur. For example, as shown in FIG. 4, the slot 230 corresponds to a portion of the ground portion 218 corresponding to a portion where the patterns 214, 216, 220, 222, 300, 302, and 304 which are signal lines are located. It is formed in the excluded area. As another example, the slot 230 is formed in a portion of the ground portion 218 and the housing member 204 where the electric fields are intensively distributed (a portion having a predetermined value or more).

Specifically, an air gap generally exists between the ground portion 218 and the housing member 204 due to a process error or the like. In this case, parallel capacitance is generated between the ground portion 218 and the housing member 204, resulting in leakage loss due to leakage current.

In a conventional antenna without a slot, a frequency band corresponding to a leakage loss due to the parallel capacitance between the ground portion and the housing member and the parallel inductance due to the signal line patterns is intended to use the antenna as shown in Fig. 5A. Was within the available frequency band. As a result, a user may not utilize the available frequency in a desired band.

However, in the antenna of the present invention, the slot 230 is formed in the portion of the ground portion 218 where leakage loss may occur, and as a result, a frequency band corresponding to the leakage loss is shown in FIG. 5 (B). Likewise, it is moved to a band outside the available frequency band. In general, since the amount of the parallel capacitance decreases due to the slot 230, the frequency band corresponding to the leakage loss is shifted to a higher band than the available frequency band. Therefore, the user can utilize the entire available frequency band usefully.

In other words, the antenna of the present embodiment transmits power input from the outside to the radiation elements 310 using the 'U' shaped patterns 214, 216, 220, and 222.

In addition, the slot 230 is formed in a part of the ground portion 218 formed on the lower surface of the first substrate 210 to reduce the leakage loss, that is, the antenna 200 is less affected by the leakage loss. Here, the slot 230 is a region except for the portion where the patterns 214, 216, 220, 222, 300, 302, and 304 are located, or electric fields are formed between the ground portion 218 and the bottom surface of the housing member 204. It may be formed in a centrally distributed part (part having a predetermined value or more). However, the number of slots 230 formed in the ground portion 218 is not particularly limited.

In the above, the patterns 214 and 216 are implemented in a two-stage structure (meaning a parallel arrangement), but may be implemented in a three-stage or more structure. In this case, the structure of the input pattern and the distribution patterns will also be modified to fit the corresponding stage structure, and constitute one distribution system.

6 is a graph illustrating a comparison of leakage loss according to an embodiment of the present invention.

Referring to Fig. 6A, in a conventional antenna using a phase shifter in which a slot is not formed in the ground portion, the leakage loss of the antenna is measured to a loss reference value of 1.5 dB or more in a significant band among available frequency bands.

On the other hand, in the antenna 200 of the present invention, in which the slot 230 uses the phase shifter 202 formed in the ground portion 218, the leakage loss of the antenna 200 at all available frequencies is 1.5 dB or less, which is a loss reference value. Was measured.

That is, it is confirmed that the leakage loss of the available frequency band in the antenna 200 of the present invention is considerably smaller than in the conventional antenna.

Hereinafter, the phase shifting process in the phase shifter 202 included in the antenna 200 shown in FIGS. 2 to 4 will be described in detail with reference to the accompanying drawings.

FIG. 7 is a view illustrating an operation structure of a feeding system according to an embodiment of the present invention, and FIG. 8 is an enlarged view of portion “A” of FIG. 7 according to an embodiment of the present invention. However, for convenience of description, only the first patterns 214 are illustrated on the first substrate 210, and only the third patterns 220 are illustrated on the second substrate 212.

When the second sub phase shifter 208 overlies the first sub phase shifter 206, as shown in FIG. 4, the first patterns 214 and the third as shown in FIGS. 7 and 8A. The patterns 220 overlap. Specifically, for example, the left pattern 220A of the specific third pattern 220 overlaps the right pattern of the first pattern 214C, and the right pattern 220C of the third pattern 220 is the first pattern. Overlap with the left pattern of 214D. As a result, the first pattern 214C is electrically connected to the first pattern 214D through the third pattern 220. That is, the first patterns 214 are electrically connected to each other through the corresponding third patterns 220.

In terms of power, the power input to the first pattern 214C is output to the first pattern 214D through the third pattern 220.

If the length of the side pattern (right pattern or left pattern) of the first patterns 214C and 214D is l _m1 and the length of the side pattern (right pattern or left pattern) of the third pattern 220 is l _m2 , The first pattern 214C or 214D and the third pattern 220 may have a maximum of l _m1 or l _m2 ( l _m1 and l _m2, whichever is smaller. Generally, only a portion of the first pattern 214C or 214D and the third pattern 228 overlap, as shown in FIG. 8.

When the first pattern (214C or 214D) the length of the non-overlapping patterns la and l _s a l _m1 l _m2 and said to have the same length of the home, a 0≤l _s «l _m1.

)은 아래의 수학식 1과 같이 l_s의 변화, 즉 전기적 길이(L)의 변화에 따라 가변된다. As described above, since the second sub phase shifter 208 moves on the first sub phase shifter 206, the size of the region where the first pattern 214C or 214D and the third pattern 220 overlap is variable. As a result, l _s and the electrical length L change according to the movement. Therefore, the phase of the power (RF signal) output in the first pattern 214D (

) Is varied according to the change of l _s , that is, the change of the electrical length L, as shown in Equation 1 below.

, λ_g는 상기 RF 신호의 파장이다.

, Λ _g is the wavelength of the RF signal.

)은 l_s의 길이 변화에 비례하여 변화됨이 확인된다. 여기서, 전기적 길이(L)는 l_s에 비례하여 변화된다. Referring to Equation 1 above, the phase (

Is changed in proportion to the change in length of l _s . Here, the electrical length L is changed in proportion to l _s .

In FIG. 7A, only one overlapping pattern of the patterns of FIG. 4 is considered, but in the case of the n-port phase shifter having a two-stage structure, (n-1) / 2 overlapping patterns exist in each step. In this case, the electrical length l _T of all the overlapped patterns is expressed by Equation 2 below.

Here, λ _{g, max} means the largest wavelength in the bandwidth of the phase shifter, λ _{g, min} means the smallest wavelength in the bandwidth, ε _r is the dielectric constant of the first substrate 210.

Referring to Equation 2, it is confirmed that the electrical length l _T of all the overlapping patterns is varied depending on the number of ports and the wavelength according to the bandwidth range.

9 is a diagram illustrating a phase adjustment process of a phase shifter according to an embodiment of the present invention.

9, for example, n (an integer of 2 or more) first patterns 214 and second patterns 216 are formed on the first dielectric substrate 210, and the patterns 214 and 216 are formed. Is electrically connected to the n radiation elements 232.

만큼 변화된 위상을 가지고 해당 제 5 패턴(306-2)을 통하여 제 2 복사 소자(310-2)로 전송되고, 나머지 전력은 다음 제 1 패턴(214-3)으로 제공된다. 물론, 제 1 패턴(214-3)으로 제공된 전력 중 일부는 패턴들(214 및 220)의 겹치는 영역의 변화(누적된 영역의 변화이므로 4△l)로 인하여

만큼 변화된 위상을 가지고 해당 제 5 패턴(306-3)을 통하여 제 2 복사 소자(310-3)로 전송되고, 나머지 전력은 다음 제 1 패턴(214-4)으로 제공된다.Assuming that the overlapping regions of the patterns 214 and 216 and the corresponding third and fourth patterns 220 and 222 are all constantly changed according to the movement of the second sub phase shifter 208, the input stage (first patterns) Some of the power input to the front end portion 214-1 is transmitted to the first radiation element 310-1 through the fifth pattern 306-1 without changing the phase, and the remaining power is transmitted to the next first pattern ( 214-2). In this case, some of the power provided to the first pattern 214-2 is due to the change 2Δl of the overlapping area of the patterns 214 and 220.

The phase shifted by a second is transmitted to the second radiation element 310-2 through the fifth pattern 306-2, and the remaining power is provided to the next first pattern 214-3. Of course, some of the power provided to the first pattern 214-3 is due to a change in the overlapping area of the patterns 214 and 220 (4Δl since it is a change in the accumulated area).

The phase shifted by a second is transmitted to the second radiation element 310-3 through the fifth pattern 306-3, and the remaining power is provided to the next first pattern 214-4.

In addition, the phase change due to the change in the overlapping area of the second patterns 216 and the fourth patterns 222 is also controlled to change similarly.

,

,‥‥,

만큼 순차적으로 변화된 위상을 가지는 RF 신호들이 해당 복사 소자들(310)로 입력되도록 패턴 들(214, 216, 220 및 222)이 구현되며, 그 결과 도 9에 도시된 바와 같이 θ만큼 빔의 경사각이 조정될 수 있다. However, as shown in FIG.

,

, ‥‥,

The patterns 214, 216, 220, and 222 are implemented such that RF signals having a phase changed in sequence are input to the corresponding radiation elements 310. As a result, as shown in FIG. 9, the inclination angle of the beam is increased by θ. Can be adjusted.

In other words, the phase shifter 202 of the present embodiment has an electrical length of overlapping portions between the first patterns 214 and the third patterns 220 and between the second patterns 216 and the fourth patterns 222. By controlling the electrical length of the overlapping parts of the to achieve the desired inclination angle.

FIG. 10 is a diagram illustrating a phase shifter used in an antenna according to the second embodiment of the present invention, and FIG. 11 is a diagram illustrating a phase adjustment process using the phase shifter of FIG. 10.

Referring to FIG. 10, the phase shifter of the present embodiment includes a first sub phase shifter 1000 and a second sub phase shifter 1002.

The first sub phase shifter 1000 may include a first substrate 1010, first patterns 1020, third patterns 1024, and a ground portion (not shown).

The second sub phase shifter 1002 includes a second substrate 1012 and second patterns 1022.

That is, unlike the first embodiment, which is implemented in a two-stage or more structure, the phase shifter of the present embodiment is implemented in a one-stage structure. Of course, the second substrate 1012 moves as it is positioned on the first substrate 1010 as shown in FIG. 11, and although not shown, at least one ground portion formed under the first substrate 1010. Slots are formed. Here, the slot may be formed in a region other than a portion corresponding to a position where the patterns 1020, 1022, and 1024 exist among the ground portions or in a portion in which electric fields are distributed above a reference value.

12 is a diagram illustrating a phase shifter included in an antenna according to a third embodiment of the present invention, and FIG. 13 is a diagram illustrating an operation structure of the phase shifter of FIG. 12.

Referring to FIG. 12, the phase shifter includes a first sub phase shifter 1200 and a second sub phase shifter 1202.

The first sub phase shifter 1200 includes a first substrate 1210, at least one first pattern 1214, a third pattern 1218, and at least one fourth pattern 1220.

The second sub phase shifter 1202 includes a second substrate 1212 and at least one second pattern 1216.

Although not shown in FIG. 12, a ground portion is formed on a lower surface of the first substrate 1210, and a slot is formed in a portion of the ground portion.

The first pattern 1214 is a conductor and is implemented in a slow wave structure as shown in FIG. 12. Specifically, the first pattern 1214 includes a base pattern 1230 and at least one protrusion 1232 protruding from the base pattern 1230, and a plurality of protrusions 1232 are formed.

According to an embodiment of the present invention, some of the first patterns 1214a to 1214n may have different electrical lengths from other first patterns. In order to implement such an electrical length difference, the number of protrusions 1232 of some of the first patterns 1214a to 1214n may be equal to the number of protrusions 1232 of the other first patterns 1214a to 1214n. Set differently from. As a result, some of the phases of the RF signals fed to the radiation elements 1222 through the first patterns 1214a to 1214n may be implemented differently. Detailed description thereof will be described later.

According to another embodiment of the present invention, in the protrusions 1232 formed in the first pattern 1214, the number of protrusions 1232 formed in the upper part may be different from the number of the protrusions 1232 formed in the lower part.

Referring to the shapes of the protrusions 1232, the protrusions 1232 are illustrated as having a rectangular shape in FIG. 12, but the protrusions 1232 may have various shapes such as a triangular shape and a curved shape.

The third pattern 1218 may be implemented in the form of a straight line on the first substrate 1200, for example, and may have a length that may cover all of the first patterns 1220.

The third pattern 218 serves as an input terminal. That is, power (RF signal) is input to one end of the third pattern 1218, and the left end of FIG. 12, and the input power is first patterns 1214 through the second pattern 1216 as described below. Is passed to.

The fourth pattern 1220 is a conductor, and electrically connects the first pattern 1214 and the output terminal element, for example, the radiation element 1222. As a result, the power input to the third pattern 1218 is transferred to the radiation element 1222 through the second pattern 1216, the first pattern 1214, and the fourth pattern 1220. As a result, a specific radiation pattern is output from the radiation element 1222.

In FIG. 12, all of the fourth patterns 1220 have the same shape and size (width and length), but according to a user's purpose, for example, a power distribution method, some of the fourth patterns 1220 may be used. The shape or size may be different from other fourth patterns 1220. As a result, the impedance of some of the fourth patterns 1220 may be different from the other fourth patterns 1220.

The second patterns 1216 are conductors, for example arranged regularly on the second substrate 1212, and have a number corresponding to the first patterns 1214.

As shown in FIG. 13, the second patterns 1216 electrically connect the third pattern 1218 and the first patterns 1214.

According to an embodiment of the present invention, the second pattern 1216 connects the first pattern 1214 and the third pattern 1218 through a coupling method, and as shown in FIG. It may have a shape. Of course, as long as the second pattern 1216 can electrically connect the first pattern 1214 and the third pattern 1218, the shape of the second pattern 1216 is not particularly limited.

In the phase shifter having such a structure, the phase of the RF signals provided to the radiation elements 1222 should be changed when the direction, that is, the inclination angle, of the radiation pattern output from the radiation elements 1222 is changed. This may be implemented by controlling the second substrate 1212 to move in the horizontal direction (horizontal direction) on the first substrate 1210 as shown in FIG. 13 while the first substrate 1210 is fixed. Of course, the first substrate 210 may be controlled to move in the left and right directions while the second substrate 1212 is fixed.

Hereinafter, a phase shifting process in the feeding system will be described with reference to the accompanying drawings.

14 is a view showing an operation structure of a feeding system according to an embodiment of the present invention.

When the second sub phase shifter 1202 rests on the first sub phase shifter 1200, a portion of the second pattern 1216 overlaps the first pattern 1214 and the second pattern (as shown in FIG. 14). Another portion of 1216 overlaps third pattern 1218. As a result, the first patterns 1214 and the third pattern 1218 are electrically connected through the second patterns 1216.

)은 위 수학식 1에서 설명 한 바와 같이 가변된다. In this state, as shown in FIG. 14, when the second sub phase shifter 1202 moves to the right direction, for example, the overlapping portions of the first pattern 1214 and the second pattern 1216 and the third pattern ( The overlapping portion of 1218 and the second pattern 1216 is changed. For example, assuming that an end portion of the second pattern 1216 is changed from point a to point c, and point b to point d, between the first patterns 1214 and the corresponding second patterns 1216. The electrical lengths of Δl 1, Δl 2, Δl 3,... Δln are respectively varied, and the electrical lengths between the third pattern 1218 and the corresponding second patterns 1216 are all changed by ΔL. Therefore, the phase of the power (RF signal) output in the fourth pattern 1220 (

) Is variable as described in Equation 1 above.

15 is a diagram illustrating an antenna using a phase shifter according to a fourth embodiment of the present invention.

Referring to FIG. 15, the phase shifter of the present embodiment includes a first sub phase shifter 1500 and a second sub phase shifter 1502.

The first sub phase shifter 1500 includes a first substrate 1510, at least one first pattern 1514, a third pattern 1518, and at least one fourth pattern 1520.

The second sub phase shifter 1502 includes a second substrate 1512 and at least one second pattern 1516.

Since the remaining components except for the first patterns 1514 and the second patterns 1516 are the same as in the third embodiment, detailed descriptions of the same components will be omitted.

The first pattern 1514 has a straight line shape, that is, the slow wave structure is not implemented in the first pattern 1514 of the present embodiment, unlike in the third embodiment, which was implemented in the slow wave structure.

The second pattern 1516 has an inverted 'C' shape, a part of which is electrically connected to the first pattern 1514, and the other part of which is electrically connected to the third pattern 1518. However, unlike the third embodiment, as shown in FIG. 15, the slow wave structure 1530 is implemented in the second pattern 1516 of the present embodiment. That is, at least one protrusion for the slow wave structure 1530 is formed in a portion of the second pattern 1516.

2 to 15, the ground portion is formed on the bottom surface of the first substrate, and at least one slot is formed on the ground portion to reduce the leakage loss.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

1 is a view schematically showing a structure of a general antenna.

2 is a schematic cross-sectional view of an antenna according to a first embodiment of the present invention.

3 is a diagram illustrating a phase shifter of FIG. 2.

4 is a diagram illustrating an operation structure of the phase shifter of FIG. 2.

5 is a diagram illustrating a graph comparing leakage loss according to a grounding structure.

6 is a graph illustrating a comparison of leakage loss according to an embodiment of the present invention.

7 is a view illustrating an operation structure of a feeding system according to an embodiment of the present invention.

FIG. 8 is an enlarged view of a portion “A” of FIG. 7 according to an embodiment of the present invention.

9 is a diagram illustrating a phase adjustment process of a phase shifter according to an embodiment of the present invention.

10 illustrates a phase shifter used in an antenna according to a second embodiment of the present invention.

FIG. 11 is a diagram illustrating a phase adjustment process using the phase shifter of FIG. 10.

12 illustrates a phase shifter included in an antenna according to a third embodiment of the present invention.

FIG. 13 is a diagram illustrating an operation structure of the phase shifter of FIG. 12.

14 is a view showing an operation structure of a feeding system according to an embodiment of the present invention.

15 is a diagram illustrating an antenna using a phase shifter according to a fourth embodiment of the present invention.

Claims (16)

Phase shifter; And A housing member housing the phase shifter, The phase shifter, A first substrate; At least one first pattern, the conductor being arranged on a first surface of the first substrate; And A ground portion arranged on a second surface of the first substrate opposite to the first surface, And the ground portion facing a portion of the housing member, wherein a slot is formed in a portion of the ground portion. The antenna of claim 1, wherein the slot is formed in an area excluding a part corresponding to an area in which the first pattern is located among the ground parts. The method of claim 1, wherein the slot is formed in a portion having an electric field equal to or greater than a predetermined value among the ground portions (a portion in which electric fields are distributed above the predetermined value among electric fields between the ground portion and the housing member). antenna. 2. The antenna of claim 1, wherein the frequency generated by the coupling between the ground portion and the housing member is in a band other than the available frequency band of the antenna. 5. The antenna of claim 4 wherein said frequency is in a higher frequency band than said available frequency band. The method of claim 1, wherein the phase shifter, A second substrate spaced apart from the first substrate by a predetermined distance; And Further comprising second patterns arranged on the second substrate, The first patterns and the second patterns face each other, and when the phase is changed, the second substrate moves, the second patterns electrically connect the first patterns to each other, and the first patterns are inversely 'U'. And a 'U' shape, wherein the second patterns have a 'U' shape. The method of claim 1, wherein the phase shifter, Second patterns arranged on the first substrate and connected in parallel with the first patterns; A second substrate spaced apart from the first substrate; At least one third pattern arranged on the second substrate and arranged corresponding to the first patterns; At least one fourth pattern arranged on the second substrate and arranged to correspond to the second patterns; An input pattern arranged on the first substrate; A first distribution pattern branched from the input pattern and electrically connected to one of the first patterns; And A second distribution pattern branched from the input pattern and electrically connected to one of the second patterns, The third pattern electrically connects the first patterns to each other, the fourth pattern electrically connects the second patterns, and when the phase is changed, the second substrate is moved, and the first patterns are inversely 'U'. The second pattern may have a 'U' shape, and the third pattern electrically connects a right side pattern of one of the first patterns with a left side pattern of a neighboring first pattern. The 4 pattern is an antenna, characterized in that for electrically connecting the right pattern of one of the second pattern and the left pattern of the neighboring second pattern. Phase shifter; And A housing member housing the phase shifter, The phase shifter, A first substrate; At least one first pattern, the conductor being arranged on a first surface of the first substrate; And A ground portion arranged on a second surface of the first substrate opposite to the first surface, And wherein the ground portion faces a portion of the housing member, wherein a frequency generated by the coupling between the ground portion and the housing member is in a band outside the available frequency band of the antenna. 9. The antenna of claim 8, wherein a slot is formed in a part of the ground portion. The method of claim 8, wherein the phase shifter, A second substrate spaced apart from the first substrate by a predetermined distance; And Further comprising second patterns arranged on the second substrate, The first patterns and the second patterns face each other, and when the phase is changed, the second substrate moves, the second patterns electrically connect the first patterns to each other, and the first patterns are inversely 'U'. And a 'U' shape, wherein the second patterns have a 'U' shape. In a phase shifter housed by a housing member, A first substrate; First patterns arranged on a first surface of the first substrate; A ground portion arranged on a second surface of the first substrate opposite to the first surface; A second substrate spaced apart from the first substrate by a predetermined distance; And At least one second pattern arranged on the second substrate and facing the first patterns, And the second pattern electrically connects the first patterns with each other, and a slot is formed in a part of the ground portion. The phase shifter of claim 11, wherein the slot is formed in an area excluding a portion corresponding to an area in which the first patterns and the second patterns are located. The phase of claim 11, wherein the slot is formed in a portion of the ground portion having an electric field greater than or equal to a predetermined value (a portion in which electric fields greater than or equal to a predetermined value are distributed among the electric fields between the ground portion and the housing member). Shifter. 12. The phase shifter of claim 11, wherein a frequency generated by the coupling between the ground portion and the housing member is in a band other than an available frequency band of the antenna. The method of claim 11, wherein the phase shifter, A second substrate spaced apart from the first substrate by a predetermined distance; And Further comprising second patterns arranged on the second substrate, The first patterns and the second patterns face each other, and when the phase is changed, the second substrate moves, the second patterns electrically connect the first patterns to each other, and the first patterns are inversely 'U'. The phase shifter of claim 2, wherein the second patterns have a 'U' shape. The method of claim 11, wherein the phase shifter, Second patterns arranged on the first substrate and connected in parallel with the first patterns; A second substrate spaced apart from the first substrate; At least one third pattern arranged on the second substrate and arranged corresponding to the first patterns; At least one fourth pattern arranged on the second substrate and arranged to correspond to the second patterns; An input pattern arranged on the first substrate; A first distribution pattern branched from the input pattern and electrically connected to one of the first patterns; And A second distribution pattern branched from the input pattern and electrically connected to one of the second patterns, The third pattern electrically connects the first patterns to each other, the fourth pattern electrically connects the second patterns, and when the phase is changed, the second substrate is moved, and the first patterns are inversely 'U'. The second pattern may have a 'U' shape, and the third pattern electrically connects a right side pattern of one of the first patterns with a left side pattern of a neighboring first pattern. The fourth pattern is a phase shifter, characterized in that for electrically connecting the right pattern of one of the second pattern and the left pattern of the neighboring second pattern.

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