WO2015085567A1 - 一种缝隙耦合印制天线 - Google Patents
一种缝隙耦合印制天线 Download PDFInfo
- Publication number
- WO2015085567A1 WO2015085567A1 PCT/CN2013/089353 CN2013089353W WO2015085567A1 WO 2015085567 A1 WO2015085567 A1 WO 2015085567A1 CN 2013089353 W CN2013089353 W CN 2013089353W WO 2015085567 A1 WO2015085567 A1 WO 2015085567A1
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- WIPO (PCT)
- Prior art keywords
- antenna
- slot
- printed antenna
- ground
- coupled
- Prior art date
Links
- 238000010168 coupling process Methods 0.000 title abstract description 27
- 238000005859 coupling reaction Methods 0.000 title abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 41
- 230000005684 electric field Effects 0.000 claims description 12
- 230000005855 radiation Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 238000010606 normalization Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/103—Resonant slot antennas with variable reactance for tuning the antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
- H01Q1/2275—Supports; Mounting means by structural association with other equipment or articles used with computer equipment associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB
Definitions
- Embodiments of the present invention relate to the field of radio frequency antenna technologies, and in particular, to a slot coupling printed antenna.
- Background Branching The main type of the main antenna of the current data card is close to the universal serial bus (English full name:
- USB Universal Serial Bus
- the printed antenna of the port is mainly cut into the U-shaped clearance area on the printed circuit board of the data card (English: Printed Circuit Board, abbreviated as: PCB).
- the antenna trace is laid out in the «clear area, and the slot antenna is formed by the coupling groove between the trace and the board ground.
- FIG. 1 is a schematic diagram of a configuration of an antenna in the prior art, including a USB port, an antenna radiator, a ground, a shield, a diversity antenna, etc., wherein the antenna radiator and the antenna radiation
- the ground around the body constitutes a slot-coupled printed antenna of the data card, wherein the solid line in the antenna radiating body is a trace, which constitutes a high-frequency slot and a low-frequency slot of the antenna 3 ⁇ 4 projecting body, etc.
- LIE Long Term Evolution
- Embodiments of the present invention provide a slot coupling printed antenna for setting a capacitance adjustable device on a slot coupling printed antenna of a data card, and adjusting a coverage frequency band of the gap coupling printed antenna by the capacitor adjustable device
- the coverage frequency of the slot-coupled printed antenna of the data card is adjustable, and the coverage of the LTE full-band can be realized in the antenna clearance smaller than the conventional slot-coupled printed antenna, thereby improving the size and bandwidth of the printed antenna and effectively satisfying the data.
- a first aspect of the present invention provides a slot-coupled printed antenna, including: an antenna radiator, a ground, and a capacitor adjustable device;
- the antenna radiator is located in the U-shaped antenna clearance of the ground, and the U-shaped antenna clearance is except for the area occupied by the antenna radiator, and the remaining area is between the antenna radiator and the ground. a gap, the capacitance adjustable device is disposed within a region of the gap;
- the capacitance adjusting device is configured to change an impedance characteristic of the slot coupling printed antenna to control movement of an antenna resonance point, and realize adjustment of a coverage frequency band of the slot coupling printed antenna.
- the capacitance tunable device is disposed at a position where an electric field strength in a region of the gap is greater than a first collar value.
- the one end of the capacitor tunable device is connected to the antenna radiator, and the capacitor tunable device is another The end is coupled to the ground such that after the radio frequency signal reaches the antenna radiator, the gap is coupled to the ground through the gap in which the capacitance tunable device has been disposed to form radiation.
- the capacitor tunable device is a tunable capacitor .
- the capacitor tunable device includes a switch and a fixed a capacitor, the switch is connected to the fixed capacitor, and one end of the series circuit formed by the switch and the fixed capacitor is connected to the antenna radiator, and the other end is connected to the ground.
- the switch is a multiplex switch, and each of the switches is connected to a fixed capacitor.
- the slot-coupled printed antenna further includes a fixed capacitor disposed at a position where an electric field strength within a region of the slot is less than a second frequency value.
- the embodiments of the present invention have the following advantages:
- the slot coupling printed antenna of the data card comprises an antenna radiator, a ground and a capacitor adjustable device, wherein the antenna radiator is located in the U-shaped antenna clearance of the ground, and the U-shaped antenna clearance is except for the area occupied by the antenna radiator, remaining The area is the gap between the antenna radiator and the ground, and the capacitance adjustable device is placed Within the region of the gap, wherein the capacitor tunable device is used to change the impedance characteristic of the slot-coupled printed antenna of the data card to control the movement of the antenna i, and the coverage frequency of the slot-coupled printed antenna is adjustable. There is no need to increase the antenna headroom, so that the miniaturization and normalization of the data card can be met. Illustration
- FIG. 1 is a schematic view showing the structure of a slot coupling printed antenna in the prior art
- FIG. 2 is a schematic diagram of a slot coupling printed antenna according to an embodiment of the present invention.
- FIG. 3 is another schematic diagram of a structure of a slot-coupled printed antenna according to an embodiment of the present invention
- FIG. 4 is another schematic diagram of a structure of a slot-coupled printed antenna according to an embodiment of the present invention
- FIG. 6a is a test group of the slot coupled printed antenna in the embodiment of the present invention
- Figure 6b is a test diagram of a slot coupled printed antenna in the actual travel example of the present invention. detailed description
- the embodiment of the present invention provides a slot-coupled printed antenna.
- the capacitor-adjustable device is arranged on the slot-coupled printed antenna of the data card, and the coverage band of the slot-coupled printed antenna is adjusted by using the adjustable-capacitance device. It can realize the coverage of LTE full-band in the antenna clearance smaller than the traditional slot-coupled printed antenna, effectively meeting the requirements of miniaturization and normalization of data cards.
- FIG. 2 is a practical example of a data card slot coupling printed antenna according to an embodiment of the present invention, including:
- the antenna radiator 201 is located in the U-shaped antenna clearance of the ground 202, and the U-shaped antenna clearance is except for the area occupied by the antenna radiator 201, and the remaining area is the gap 204 between the antenna radiator 201 and the ground 202, and the capacitance
- the adjustable device 203 is disposed within the area of the slot 204;
- a radio frequency (Radio Frequency, abbreviated as: RF) signal is fed to the antenna radiator 201, and then coupled to the ground 202 through a slot 204 in which the capacitance adjusting device 203 is disposed, thereby forming radiation.
- the capacitance adjusting device 203 is used for Changing the impedance characteristics of the slot coupling printed antenna of the data card, so that the electric field distribution in the region of the slot 204 between the antenna radiator 201 and the ground 202 can be changed by different capacitances, thereby realizing the slot coupling printed antenna of the data card
- the coverage frequency of the printed antenna is adjustable.
- the electric field intensity of the capacitance adjusting device 203 disposed in the region of the slot 204 is greater than the first preset value.
- the value of the first preset can be set by the operator according to the actual situation, and the capacitance adjusting device 203 can be set at any position in the region that satisfies the condition.
- the capacitance adjusting device 203 is placed at a position where the electric field intensity in the region of the slot 204 is greater than the first preset value, wherein the region where the electric field strength is greater than the preset first value belongs to the electric field.
- the capacitor adjusting device 203 is disposed at any position in the area to effectively control the movement of the antenna resonance point, and the capacitance of the capacitance adjusting device 203 is larger, and the resonance point is shifted to a lower frequency, so that the gap of the data card Coated printed antennas cover a wider range of frequency bands.
- the position of the capacitance adjusting device 203 in FIG. 2 is that the capacitance adjusting device 203 is disposed at a position that satisfies the condition within the region of the slot 204. In practical applications, the capacitance adjusting device 203 can also be set. In other positions that satisfy the condition, therefore, FIG. 2 does not limit the position of the capacitance tunable device 203.
- an embodiment of a structure for a slot coupling printed antenna comprising:
- the antenna radiator 201 is located in the U-shaped antenna clearance of the ground 202, and the U-shaped antenna clearance is except for the area occupied by the antenna radiator 201, and the remaining area is the gap 204 between the antenna radiator 201 and the ground 202.
- the adjustment device 203 is disposed within the area of the gap 204.
- one end of the capacitance adjusting device 203 is in communication with the antenna radiator 201, and the other end of the capacitance adjusting device 203 is connected to the ground 202, so that the impedance characteristic of the gap-coupling printed antenna of the data card can be changed by the capacitor adjustable device.
- the slot ft of the coupled printed antenna can be effectively changed, and the coverage frequency of the slot-coupled printed antenna of the data card can be adjusted.
- the capacitor tunable device 203 shown in FIG. 3 can be a tunable capacitor.
- the capacitor tunable device 203 in the embodiment shown in FIG. 3 is a tunable capacitor 401 .
- the schematic diagram of the slot-coupled printed antenna structure wherein one end of the adjustable capacitor 401 is connected to the antenna radiator 201, and the other end of the adjustable capacitor 401 is connected to the ground, and the adjustable capacitor can be processed by a processor in the data card ( Control is not shown in the figure, the processor can adjust the capacitance of the 3 ⁇ 4 adjustable capacitor as needed, so that The cover band of the slot-coupled printed antenna of the digital video card can be changed, and the coverage frequency of the ft-gap coupled printed antenna of the data card can be adjusted without increasing the antenna clearance, which can effectively satisfy the data card ⁇ ! The need to normalize fli.
- the capacitor-adjustable device 203 shown in FIG. 3 may also include a switch and a fixed capacitor.
- the capacitor-adjustable device 203 in the implementation of FIG. 3 includes a switch. 501 and a fixed capacitor 502, a schematic diagram of the structure of the slot of the data card coupled to the printed antenna, wherein after the switch 501 is connected in series with the fixed capacitor 502, one end of the circuit after the series connection is connected to the antenna radiator 201, and the other end is connected to the ground 202.
- the switch 501 can be controlled by a processor (not shown in the figure) in the data card, and the processor can control the on and off of the switch, so that the adjustable capacitance device is equivalent to different capacitance values to change the data.
- the gap of the card is coupled with the IS anti-characteristic of the printed antenna, and the slot frequency of the data card is adjustable.
- the coverage frequency of the antenna is adjustable and the antenna clearance is not required, which can effectively meet the requirements of miniaturization and normalization of the data card.
- the switch 501 in the embodiment shown in FIG. 5 may be a multi-way switch, and each of the multi-way switches is connected with a fixed capacitor 502, and the multi-way switch may be a processor in the data card ( Not shown in the figure), the processor can control the switch to select different paths, so that the gap of the data card is coupled to the capacitor with different capacitance values in the printed antenna, thereby changing the impedance of the slot coupling printed antenna of the data card.
- the feature makes the coverage frequency of the slot-coupled printed antenna of the data card adjustable. In practical applications, it can also be a combination of a switch and an inductor, and the effect of changing the impedance characteristics of the antenna to achieve the offset of the antenna band.
- a fixed capacitor (not shown in the figure) may be further included, and the fixed capacitor is set.
- the electric field intensity in the region of the gap 204 between the antenna radiator 201 and the ground 202 is less than the second preset value, wherein the electric field strength in the region of the slit 204 is smaller than the value of the second set
- the area belongs to the sensitive area of the high-frequency electric field.
- the fixed capacitor is placed at any position in the area, which can be used as the parallel matching capacitor of the feeding point of the data card printed antenna, which can effectively change the high-frequency resonance and expand the height. Frequency band.
- FIG. 6a and FIG. 6b are test charts obtained by testing the slot-coupled printed antenna of the data card of the 7mm antenna clearance.
- the slot coupling printed antenna of the card comprises a capacitance adjusting device 203, wherein, FIG. 6a
- S1 simulation curve of the printed antenna is coupled.
- S11 is one of the S parameters, indicating that the matching between the antenna and the RF front end is good or bad.
- the vector network analyzer shows that the S11 value is larger, indicating The less the antenna and the RF front end match, the less energy is entered into the antenna, so the system efficiency of the antenna is worse.
- Figure 6b shows the antenna system efficiency of the slot-coupled printed antenna simulation of the data card.
- the abscissa indicates the frequency, and the ordinate indicates the antenna system efficiency.
- the slot-coupled printed antenna of the data card can cover all frequency bands of the WE.
- the antenna has sufficient bandwidth and radiation efficiency to meet the data card. Miniaturization and normalization needs.
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Abstract
一种缝隙耦合印制天线，该缝隙耦合印制天线包括：天线辐射体、地、电容可调装置；天线辐射体位于地的U型天线净空内，且U型天线净空除天线辐射体占用的区域外，剩余的区域为天线辐射体与地之间的缝隙，电容可调装置设置在缝隙的区域范围内；电容可调装置用于改变缝隙耦合印制天线的阻抗特性，以控制天线谐振点的移动，实现缝隙耦合印制天线的覆盖频段的可调。
Description
一种缝隙耦合印制天线 技术镇
本发明实施例涉及射频天线技术领域， 尤其涉及一种缝隙耦合印制天线。 背景枝术 目前数据卡的主天线的主要类型是靠近通用串行总线 （英文全称为：
Universal Serial Bus, 缩写为： USB )端口的印制天线， 该印制天线主要是通 过在数据卡的印制电路板 (英文全称为： Printed Circuit Board, 缩写为： PCB ) 上切 U型净空区， 天线走线布局在 «净空区内， 利用走线和板地之间的耦合 槽形成縫隙天线。 为了更好地理解现有技术， 请参阅图 1 , 为现有技术中的 天线的构造的示意图， 包括 USB端口、 天线辐射体、 地， 屏蔽罩、 分集天线 等， 其中天线辐射体和天线輻射体周围的地构成了数据卡的缝隙耦合印制天 线， 其中天线辐射体内的实线为走线，构成天线 ¾射体的高频槽和低频槽等区 域， 需要说明的是， 在实际应用中， 可根据实际的需要在天线辐射体内走线， 图 1仅为一个可行的应用场景。 目前的长期演进（英文全称为： Long Term Evolution, 缩写为： LIE )数 据卡印制天线净空最小为 14mm， 覆盖频段为 791〜960ΜΗζ , 及 1710~2690MHz , 如果要覆盖北美频段 ( 698-791 MHz ) 和日本频段 ( 1420~1520MHz ), 天线净空还要增加 ， 然而天线净空的增加又将导致数据 卡难以实现小型化， 因此，传统的数据卡的缝隙耦合印制天线不能在小尺寸的 天线净空下实现 LTE全频段覆盖， 难以满足 LTE数据卡小型化及归一化的需 求。 本发明实施例提供了一种缝隙耦合印制天线，用于在数据卡的缝隙耦合印 制天线上设置电容可调装置，通过该电容可调装置调整该綾隙耦合印制天线的 覆盖频段， 实现数据卡的缝隙耦合印制天线的覆盖频段可调， 能够在比传统的 缝隙耦合印制天线小的天线净空内实现 LTE全频段的覆盖， 从而改善印制天 线尺寸和带宽， 有效的满足数据卡小型化及归一化的需求。
本发明第一方面提供了一种缝隙鵜合印制天线， 包括： 天线辐射体、 地、 电容可调装置；
所述天线辐射体位于所述地的 U型天线净空内， 且所述 U型天线净空除 所迷天线辐射体占用的区域外，剩余的区域为所述天线辐射体与所述地之间的 缝隙， 所述电容可调装置设置在所述缝隙的区域范围内；
所述电容可调装置用于改变所述缝隙耦合印制天线的阻抗特性，以控制天 线谐振点的移动， 实现所述缝隙耦合印制天线的覆盖频段的可调。
在第一方面第一种可能的实现方式中，所述电容可调装置设置在所述缝隙 的区域范围内的电场强度大于第一领置数值的位置上。
结合第一方面第一种可能的实现方式，在第一方面第二种可能的实现方式 中， 所述电容可调装置的一端与所述天线辐射体连接，所述电容可调装置的另 —端与所述地连接，使得射频信号到达所述天线辐射体之后，再通过已设置所 述电容可调装置的所述缝隙耦合到所述地， 形成辐射。
结合第一方面或者第一方面第一种可能的实现方式或者第一方面第二种 可能的实现方式,在第一方面第三种可能的实现方式中，所述电容可调装置为 可调电容。
结合第一方面或者第一方面第一种可能的实现方式或者第一方面第二种 可能的实现方式,在第一方面第四种可能的实现方式中，所述电容可调装置包 括开关和固定电容， 所述开关与所述固定电容连接， 且所述开关与所述固定电 容构成的串联电路的一端与所述天线辐射体连接， 另一端与所述地连接。
结合第一方面第四种可能的实现方式，在第一方面第五种可能的实现方式 中， 所述开关为多路开关， 所述开关的每一路上都连接固定电容。
第一方面第六种可能的实现方式为所述缝隙耦合印制天线还包括固定电 容，所述固定电容设置在所述缝隙的区域范围内的电场强度小于第二频置数值 的位置上。
从以上技术方案可以看出， 本发明实施例具有以下优点：
数据卡的缝隙耦合印制天线包括天线輻射体、 地及电容可调装置， 其中， 天线辐射体位于地的 U型天线净空内， 且该 U型天线净空除天线辐射体占用 的区域外， 剩余的区域为天线辐射体与地之间的缝隙， 电容可调装置 置在
该缝隙的区域范围内，其中， 电容可调装置用于改变数据卡的缝隙耦合印制天 线的阻抗特性， 以控制天线 i皆振点的移动， 实现缝隙耦合印制天线的覆盖频段 可调且不需要增加天线净空， 使得能够满足数据卡的小型化及归一化的需求。 图说明
图 1为现有技术中的缝隙耦合印制天线的结构的示意图；
图 2为本发明实施例中缝隙耦合印制天线的一个示意图；
图 3为本发明实施例中缝隙耦合印制天线的结构的另一示意图； 图 4为本发明实施例中缝隙耦合印制天线的结构的另一示意图； 图 5为本发明实施例中缝隙耦合印制天线的结构的另一示意图； 图 6a为本发明实施例中缝隙耦合印制天线的测试團；
图 6b为本发明实旅例中缝隙耦合印制天线的测试图。 具体实施方式
本发明实旄例提供了一种缝隙耦合印制天线，通过在数据卡的缝隙耦合印 制天线上设置电容可调装置，利用 i食电容可调装置调整该缝隙耦合印制天线的 覆盖频段， 能够在比传统缝隙耦合印制天线小的天线净空内实现 LTE全頻段 的覆盖， 有效的满足数据卡小型化及归一化的需求。
为了更好的理解本发明的技术方案， 请参阅图 2， 为本发明实施例中数据 卡缝隙耦合印制天线的实旄例， 包括：
天线辐射体 201、 地 202、 电容可调装置 203;
其中， 天线辐射体 201位于地 202的 U型天线净空内， 且 U型天线净空 除天线辐射体 201占用的区域外，剩余的区域为天线辐射体 201与地 202之间 的缝隙 204, ，电容可调装置 203设置在缝隙 204的区域范围内；
射频（Radio Frequency, 缩写为： RF )信号馈到天线辐射体 201上,再通 过已设置电容可调装置 203的缝隙 204耦合到地 202上，从而形成辐射. 其中， 电容可调装置 203用于改变数据卡的缝隙耦合印制天线的阻抗特性，使得可以 通过不同的电容改变天线辐射体 201与地 202之间的缝隙 204的区域范围内的 电场分布，从而实现数据卡的缝隙耦合印制天线的谐振点的移动， 实现缝隙：耦
合印制天线的覆盖频段的可调。
在本发明实施例中，为了更好地实现数据卡的缝隙耦合印制天线的覆盖频 段可调的目的，电容可调装置 203设置在缝隙 204的区域范围内的电场强度大 于第一预置数值的位置上， 该第一预置的数值可由操作人员根据实际情况设 置， 且电容可调装置 203可设置在满足条件的区域内的任意一个位置上。
在本发明实施例中是将电容可调装置 203放置于缝隙 204的区域范围内的 电场强度大于第一预置数值的位置上， 其中， 电场强度大于预置的第一数值的 区域属于电场较敏感区域，在该区域内的任意一处设置电容可调装置 203可以 有效控制天线谐振点的移动，且电容可调装置 203的电容越大，谐振点越往低 频偏移， 使得数据卡的缝隙耦合印制天线的可覆盖的频段范围更广„
需要说明的是，图 2中电容可调装置 203的位置为电容可调装置 203设置 在缝隙 204的区域范围内的一个满足条件的位置上，在实际应用中 , 电容可调 装置 203还可设置在其他的满足条件的位置上，因此图 2并不对电容可调装置 203的位置造成限定。
为了更好的理解本发明实施例中的缝隙耦合印制天线的结构， 请参阅图
3， 为缝隙耦合印制天线的结构的实施例， 包括：
天线辐射体 201、 地 202、 电容可调装置 203;
其中， 天线辐射体 201位于地 202的 U型天线净空内， 且 U型天线净空 除天线辐射体 201占用的区域外，剩余的区域为天线辐射体 201与地 202之间 的缝隙 204, 电容可调装置 203设置在缝隙 204的区域范围内。
具体的， 电容可调装置 203的一端与天线辐射体 201连通， 电容可调装置 203的另一端与地 202连通， 使得可通过电容可调装置改变数据卡的綾隙耦合 印制天线的阻抗特性， 以控制天线 "¾k振点的移动，使得能够有效改变缝 ft:耦合 印制天线的覆盖频段， 实现数据卡的缝隙耦合印制天线的覆盖频段的可调。
在本发明实施例中，图 3所示实施倒中的电容可调装置 203可以是可调电 容，请参阅图 4，为图 3所示实施例中的电容可调装置 203为可调电容 401时， 缝隙耦合印制天线结构的示意图， 其中， 可调电容 401 的一端与天线辐射体 201连接， 可调电容 401的另一端与地连接， 该可调电容可以由数据卡中的处 理器（未在图中画出）控制， 处理器可根据需要调整¾可调电容的电容， 使得
能够改变数椐卡的缝隙耦合印制天线的覆盖频段，实现数据卡的 ft隙耦合印制 天线的覆盖频段可调且不需要增加天线净空，能够有效的满足数据卡 <■!、型化及 归一 fli的需求。
在本发明实施例中，图 3所示实旄倒中的电容可调装置 203也可以包括开 关和固定电容， 请参阅图 5, 为图 3所示实施飼中的电容可调装置 203包括开 关 501和固定电容 502 的时， 数据卡的缝隙耦合印制天线的结构的示意图， 其中，开关 501与固定电容 502串联之后， 串联之后的电路的一端与天线辐射 体 201连接， 另一端与地 202连接， 该开关 501可由数据卡中的处理器（未在 图中画出）控制， 处理器可控制开关的导通和断开， 使得可调电容装置等效成 不同的容值， 以改变数据卡的缝隙耦合印制天线的 IS抗特性， 实现数据卡的缝 隙耦合印制天线的覆盖频段可调且不需要增加天线净空，能够有效的满足数据 卡小型化及归一化的需求。
在本发明实施例中， 图 5所示实施例中的开关 501可以为多路开关， 多路 开关的每一路上都连接固定电容 502, 且该多路开关可以由数据卡中的处理器 (未在图中画出）控制， 处理器可控制开关选捧不同的通路， 使得数据卡的缝 隙耦合印制天线中具有不同容值的电容，从而可改变数据卡的缝隙耦合印制天 线的阻抗特性，使得数据卡的缝隙耦合印制天线的覆盖频段可调。在实际应用 中还可以是开关和电感的組合， 样的也是改变天线的阻抗特性从而达到天线 频段偏移的效果.
优选的，在本发明实旄例中的图 2至图 5所示实施倒中的数据卡的缝隙耦 合印制天线中， 还可以包括固定电容（未在图中画出）， 该固定电容设置在天 线辐射体 201与地 202之间的缝隙 204的区域范围内的电场强度小于第二预置 的数值的位置上，其中，缝隙 204的区域范围内的电场强度小于第二 ¾置的数 值的区域属于高频电场较敏感的区域，在 «区域内的任意一个位置上放置固定 电容，可以作为是数据卡印制天线的馈电点的并联匹配电容，可以有效的改变 高频谐振， 拓展高频频段。
为了更好的理解本发明实施中的数椐卡的缝隙耦合印制天线， 请参阅图 6a和 6b,为对 7mm天线净空的数据卡的缝隙耦合印制天线进行测试得到的测 试图， 该数据卡的缝隙耦合印制天线中包含电容可调装置 203， 其中， 图 6a
为数据卡的缝隙耦合印制天线的 Sl l仿真曲线图， S11 是 S参数中的一个，表 示天线与射频前端的匹配情况好坏， 一般通过矢量网络分析仪来看， S11值越 大， 表示天线与射频前端越不匹配， 进入天线的能量越少， 这样天线的系统效 率就越差； S11值越小， 曲线越深， 表示天线与射频前端的匹配越好， 进入天 线的能量就越多， 这样天线的系统效率就越高。 图 6a中的两条曲线是表示可 变电容装置 203在不同电容值时（其中， 01表示 C=1.5pf, 02表示 0.3pf)， 天 线的 S11特性.， 从图 6a中可以看出电容越大低频谐振点越低， 从而覆盖低频 频段， 电容值越小， 谐振越往高频偏移， 从而覆盖高频频段。
图 6b为数据卡的缝隙耦合印制天线仿真的天线系统效率， 横坐标表示的 是频率， 纵坐标表示的是天线系統效率， C=l .2和 C=0.3也是表示可调电容装 置 203在不同容值下的天线系统效率， 从图 6a和图 6b中可以看出， 该数据卡 的缝隙耦合印制天线可以覆盖 WE的所有频段， 天线有足够的带宽和辐射效 率， 能够满足数据卡的小型化及归一化的需求。
以上对本发明所提供的一种缝隙耦合印制天线，进行了详细介绍，对于本 领域的一般技术人员，依据本发明实施例的思想，在具体实施方式及应用范围 上均会有改变之处， 综上所述， 本说明书内容不应理解为对本发明的限制。
Claims
1、 一种缝隙耦合印制天线， 其特征在于， 包括：
天线辐射体、 地、 电容可调装置；
所述天线辐射体位于所述地的 U型天线净空内， 且所述 U型天线净空除 所述天线辐射体占用的区域外 ,剩余的区域为所述天线辐射体与所述地之间的 缝隙， 所述电容可调装置设置在所述缝隙的区域范围内；
所述电容可调装置用于改变所述缝隙耦合印制天线的阻抗特性，以控制天 线谐振点的移动， 实现所述缝隙耦合印制天线的覆盖频段的可调。
2、 根据权利要求 1所述的缝隙耦合印制天线， 其特征在于， 所述电容可 调装置设置在所述缝隙的区域范围内的电场强度大于第一预置数值的位置上。
3、 根据权利要求 2所述的缝隙耦合印制天线， 其特征在于， 所述电容可 调装置的一端与所述天线辐射体连接，所述电容可调装置的另一端与所述地连 接，使得射频信号到达所述天线輻射体之后，再通过已设置所述电容可调装置 的所述缝隙耦合到所述地， 形成辐射。
4、 根据权利要求 1至 3任一项所述的缝隙耦合印制天线， 其特征在于， 所述电容可调装置为可调电容。
5、 根据权利要求 1至 3任一项所述的缝隙耦合印制天线， 其特征在于， 所述电容可调装置包括开关和固定电容， 所述开关与所述固定电容连接，且所 述开关与所述固定电容构成的串联电路的一端与所述天线辐射体连接，另一端 与所述地连接。
6、 根据权利要求 5所述的縫隙耦合印制天线， 其特征在于， 所述开关为 多路开关， 所述开关的每一路上都连接固定电容。
7、 根据权利要求 1所述的缝隙耦合印制天线， 其特征在于， 所述缝隙耦 合印制天线还包括固定电容，所述固定电容设置在所述途隙的区域范围内的电 场强度小于第二 置数值的位置上。
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