WO1998048478A1 - High impedance type high frequency antenna - Google Patents
High impedance type high frequency antenna Download PDFInfo
- Publication number
- WO1998048478A1 WO1998048478A1 PCT/KR1997/000096 KR9700096W WO9848478A1 WO 1998048478 A1 WO1998048478 A1 WO 1998048478A1 KR 9700096 W KR9700096 W KR 9700096W WO 9848478 A1 WO9848478 A1 WO 9848478A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- module
- impedance
- high impedance
- high frequency
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
-
- 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
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Definitions
- the present invention relates to a high impedance type high frequency antenna, and in particular, to an improved high impedance type high frequency antenna by which the antenna is not influenced by an external factor when a human body or the like approaches the antenna by enabling a high impedance by decreasing a reactance component and increasing a resistance component, whereby it is possible to fabricate a compact size product.
- the conventional antenna of a mobile phone, a wireless phone, a PCS (Personal Communication System), or the like is lengthy, thus causing inconvenience. Therefore, it is needed to fabricate a shorter antenna of the system.
- the resistance R should be preferably 250 ⁇ , and the reactance X should be preferably -350—450.
- the antenna is easily influenced when a human body or the like approaches the same due to the resistance R and the reactance X, thus degrading the SWR (Standing Wave Ratio) and an antenna characteristic, whereby the lengthy of the antenna of a high frequency broad band wireless instrument becomes about 16-18 cm.
- FIGs 1 through 4 are schematic diagrams illustrating conventional antennas. As shown therein, there are known four kinds of loading type antennas in which 1/2 ⁇ and 1/4 ⁇ are used.
- the helical antenna of 1/4 ⁇ and the monopole antenna of 1/2 ⁇ monopole antenna of 1/2 ⁇ is generally used.
- the capacity of antenna is indicated as a R and jX, and in the monopole antenna of 1/2 ⁇ , the value of R is 200-300 ⁇ , and the value of X is -300— 400 ⁇ .
- the monopole antenna has a lower resistance (R: 200-300 ⁇ ) and a reactance component (X: -300—400 ⁇ ), the antenna is influenced when a human body or the like approaches the same.
- a high impedance type high frequency antenna which includes an RF module having an input and output capacity of 50 ⁇ , and a matching circuit connected between the antenna and the RF module for outputting 50 ⁇ of an impedance and having a smith chart at a 1/4 ⁇ helical portion so that a 1/2 ⁇ monopole antenna is matched with a 50 ⁇ RF module
- the matching circuit includes a condenser having a capacity of 1 PF and an inductor having a capacity of 18mH, and the impedance of the 1/2 ⁇ monopole is 400-500 ⁇ , and a reactance of the same is 0,
- the matching circuit includes a condenser having a capacity of 1PF and an inductor having a capacity of 18mH, and the impedance of the 1/2 ⁇ monopole is 400-500 ⁇ , and the reactance of the same is 0.
- FIGS. 1 through 4 are schematic diagrams illustrating the constructions of conventional antennas
- FIG. 5 is a schematic diagram illustrating the construction of a high impedance type high frequency antenna according to the present invention
- Figure 6 is a detailed circuit diagram illustrating a matching circuit according to the present invention
- Figure 7 is a diagram illustrating a smith chart according to the present invention.
- Figures 8A through 8C are front views illustrating the construction of an antenna according to the present invention, of which: Figure 8A is a front view illustrating an antenna according to the present invention;
- Figure 8B is a front view illustrating an inductor according to the present invention.
- Figure 8C is a front view illustrating a condenser according to the present invention.
- FIG. 5 illustrates the construction of a high impedance type high frequency antenna according to the present invention.
- the high impedance type high frequency antenna according to the present invention includes an RF module 10 having an input and output capacity of 50 ⁇ , an antenna 20 for receiving and transmitting signals, and a matching circuit 30 connected between the antenna 20 and the RF module for outputting 50 ⁇ of the impedance of the antenna so that the signal from the antenna 20 is made identical to the impedance of the RF module 10.
- FIG. 6 illustrates a matching circuit according to the present invention. As shown therein, a condenser C10 of 1pF and an inductor L10 of a 18mH are connected.
- Figure 7 illustrates a smith chart according to the present invention
- Figures 8A through 8C illustrate the construction of an antenna according to the present invention, of which:
- Figure 8A is a front view illustrating an antenna according to the present invention
- Figure 8B is a front view illustrating an inductor according to the present invention
- Figure 8C is a front view illustrating a condenser according to the present invention.
- points A through C denote impedance flowing paths. Namely, such points are impedance regions in which there is not a reactance component, and the resistance component is
- the output from the RF module 10 is 50 ⁇ , the output is related to the point B in the smith chart.
- the parallel condenser of an admittance chart and the serial inductor of an impedance chart are further needed.
- the condenser C10 having a capacity of 1pF and the inductor L10 having a capacity of 18mH are needed.
- the integer values may be varied based on the various environment during the experiment or test.
- the high impedance of the antenna is matched with the RF module output impedance of the matching circuit 30.
- the monopole antennas of the 1/4 ⁇ and 1/2 ⁇ are made shorter, and the antenna is not influenced by the human body or the like by using a high impedance antenna.
- the 1/2 ⁇ monopole portion becomes a high impedance by using an LC matching circuit of the helical antenna portion of 1/4 ⁇ , and the 1/4 ⁇ helical antenna becomes a matching circuit.
- the antenna is not influenced by the human or the like by decreasing the reactance component and increasing the resistance component, for thus forming a high impedance state, and it is possible to fabricate an antenna having a lengthy of about 8- 10cm, whereby it is possible to fabricate a compact size product.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Details Of Aerials (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9715003-7A BR9715003A (pt) | 1997-04-21 | 1997-05-27 | Antena de alta frequência tipo alta impedância |
AU30491/97A AU3049197A (en) | 1997-04-21 | 1997-05-27 | High impedance type high frequency antenna |
IL13106597A IL131065A0 (en) | 1997-04-21 | 1997-05-27 | High impedance type high frequency antenna |
JP10545496A JP2000512118A (ja) | 1997-04-21 | 1997-05-27 | ハイインピーダンス型の高周波アンテナ |
EP97925312A EP0981840A1 (en) | 1997-04-21 | 1997-05-27 | High impedance type high frequency antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1997/14726 | 1997-04-21 | ||
KR1019970014726A KR19980077560A (ko) | 1997-04-21 | 1997-04-21 | 하이임피던스형 고주파용 안테나 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998048478A1 true WO1998048478A1 (en) | 1998-10-29 |
Family
ID=19503432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR1997/000096 WO1998048478A1 (en) | 1997-04-21 | 1997-05-27 | High impedance type high frequency antenna |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0981840A1 (xx) |
JP (1) | JP2000512118A (xx) |
KR (1) | KR19980077560A (xx) |
CN (1) | CN1249071A (xx) |
AU (1) | AU3049197A (xx) |
BR (1) | BR9715003A (xx) |
IL (1) | IL131065A0 (xx) |
WO (1) | WO1998048478A1 (xx) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2773289A1 (fr) * | 1997-12-26 | 1999-07-02 | Samsung Electronics Co Ltd | Circuit d'antenne de telephone portable ayant une sensibilite reduite au corps humain et procede pour realiser celui-ci |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107978862A (zh) * | 2017-12-19 | 2018-05-01 | 福建省泉州华鸿通讯有限公司 | 一种超宽频高增益短波天线 |
CN210958415U (zh) | 2019-07-17 | 2020-07-07 | 华为技术有限公司 | 一种中框、电池盖和电子设备 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145693A (en) * | 1977-03-17 | 1979-03-20 | Electrospace Systems, Inc. | Three band monopole antenna |
GB2202380A (en) * | 1987-03-20 | 1988-09-21 | Philips Electronic Associated | Helical antenna |
US4890116A (en) * | 1986-04-09 | 1989-12-26 | Shakespeare Company | Low profile, broad band monopole antenna |
EP0208984B1 (de) * | 1985-07-03 | 1990-05-23 | Siemens Aktiengesellschaft | Verfahren zur automatischen Impedanzanpassung eines Senders an eine Antenne |
US5270667A (en) * | 1992-03-31 | 1993-12-14 | Raytheon Company | Impedance matching and bias feed network |
US5489912A (en) * | 1994-09-08 | 1996-02-06 | Comant Industries, Inc. | Non-resonant antenna and feed apparatus therefor |
-
1997
- 1997-04-21 KR KR1019970014726A patent/KR19980077560A/ko not_active Application Discontinuation
- 1997-05-27 BR BR9715003-7A patent/BR9715003A/pt not_active Application Discontinuation
- 1997-05-27 IL IL13106597A patent/IL131065A0/xx unknown
- 1997-05-27 WO PCT/KR1997/000096 patent/WO1998048478A1/en not_active Application Discontinuation
- 1997-05-27 AU AU30491/97A patent/AU3049197A/en not_active Abandoned
- 1997-05-27 JP JP10545496A patent/JP2000512118A/ja active Pending
- 1997-05-27 CN CN97181995.5A patent/CN1249071A/zh active Pending
- 1997-05-27 EP EP97925312A patent/EP0981840A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145693A (en) * | 1977-03-17 | 1979-03-20 | Electrospace Systems, Inc. | Three band monopole antenna |
EP0208984B1 (de) * | 1985-07-03 | 1990-05-23 | Siemens Aktiengesellschaft | Verfahren zur automatischen Impedanzanpassung eines Senders an eine Antenne |
US4890116A (en) * | 1986-04-09 | 1989-12-26 | Shakespeare Company | Low profile, broad band monopole antenna |
GB2202380A (en) * | 1987-03-20 | 1988-09-21 | Philips Electronic Associated | Helical antenna |
US5270667A (en) * | 1992-03-31 | 1993-12-14 | Raytheon Company | Impedance matching and bias feed network |
US5489912A (en) * | 1994-09-08 | 1996-02-06 | Comant Industries, Inc. | Non-resonant antenna and feed apparatus therefor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2773289A1 (fr) * | 1997-12-26 | 1999-07-02 | Samsung Electronics Co Ltd | Circuit d'antenne de telephone portable ayant une sensibilite reduite au corps humain et procede pour realiser celui-ci |
Also Published As
Publication number | Publication date |
---|---|
BR9715003A (pt) | 2001-09-18 |
KR19980077560A (ko) | 1998-11-16 |
IL131065A0 (en) | 2001-01-28 |
EP0981840A1 (en) | 2000-03-01 |
CN1249071A (zh) | 2000-03-29 |
AU3049197A (en) | 1998-11-13 |
JP2000512118A (ja) | 2000-09-12 |
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