KR102023911B1 - Dual band Helical Antenna with fine tuning capability for operating frequencies - Google Patents
Dual band Helical Antenna with fine tuning capability for operating frequencies Download PDFInfo
- Publication number
- KR102023911B1 KR102023911B1 KR1020140066056A KR20140066056A KR102023911B1 KR 102023911 B1 KR102023911 B1 KR 102023911B1 KR 1020140066056 A KR1020140066056 A KR 1020140066056A KR 20140066056 A KR20140066056 A KR 20140066056A KR 102023911 B1 KR102023911 B1 KR 102023911B1
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- KR
- South Korea
- Prior art keywords
- helical antenna
- band
- frequency
- antenna
- operating
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
Abstract
The present invention relates to a dual band helical antenna capable of fine tuning the operating frequency.
The present invention configures a helical antenna having a dual band characteristic, and configures the helical antenna with an adjusting unit capable of finely adjusting the dual bands and adjusting the operating frequency, thereby making it possible to adjust the band frequency and operating frequency of the helical antenna with the adjusting unit. In addition, the gain characteristics of the helical antenna in the corresponding band can be improved, and the operating frequency error generated during the antenna production process can be efficiently compensated.
Description
The present invention relates to a dual band helical antenna capable of fine tuning the operating frequency, and more particularly, to a dual band helical antenna capable of fine tuning the operating frequency capable of finely adjusting the resonance frequency of the antenna by providing a frequency adjusting unit in the antenna. will be..
A general helical antenna may be configured in an axial mode and a normal mode according to the configuration of the spiral. The axial mode helical antenna is operated in the axial mode in which the circularly polarized wave is radiated in the axial direction when the length of the spiral is before one wavelength and the pitch length is one of the number of wavelengths. do.
On the other hand, the vertical mode spiral antenna whose spiral length is half-wavelength and exactly doubled or tripled the length of the spiral is widely used for UHF television broadcasting and mobile radio base station antennas.
Since the normal mode helical antenna can achieve a small size and a high gain compared to a general loop antenna, it is mainly used instead of a large λ / 4 monopole antenna.
Small vertical-mode helical antennas have sinusoidal current distribution along the helix, and the end impedance is very sensitive and the bandwidth is narrow as the frequency changes. Nevertheless, the vertical mode spiral antenna is effectively used for personal mobile communication and wireless communication because it can effectively reduce the effective length of the antenna.
Short vertical helical antennas, when used in combination with ground planes, cause vertical polarization, resulting in a radiation pattern similar to monopole antennas. The series feed method connects the spiral directly to the coaxial input and requires an impedance converter or an impedance voltage circuit.
As described above, the helical antenna has an antenna resonant frequency determined according to winding characteristics when the antenna is manufactured, and thus it is impossible to fine tune the frequency to a band desired by the user. Moreover, the user has a problem that it is impossible to change the operating frequency arbitrarily.
The present invention for solving the above problems is to facilitate the adjustment of the band frequency fine tuning and operating frequency of the helical antenna.
Another invention for solving the above problems is to be able to adjust the band frequency and operating frequency of the helical antenna, to be used as a multi-band antenna of more than a dual band.
Means for Solving the Problems According to the present invention, a helical antenna having a dual band characteristic of a densely wound low frequency operating band and a loosely wound high frequency operating band, and a variable length of the helical antenna are used to variably adjust an operating band and an operating frequency. It includes an adjustable portion, wherein the adjusting portion includes a sensitizing screw at the end of the tightly wound low frequency operating band, the fixing screw to the portion where the tightly wound low frequency operating band and the loosely wound high frequency operating band is connected Characterized in that it comprises a.
The effect of the present invention according to the above problem is to configure a helical antenna having a dual band characteristics, by configuring the helical antenna fine adjustment of the dual bands and the operating frequency adjustment, the band frequency and operating frequency of the helical antenna By adjusting the by the adjusting unit, it is possible to improve the gain characteristics in the corresponding band of the helical antenna, and to efficiently correct the operating frequency error generated during the antenna production process.
1 is a configuration and exploded view of a helical antenna applied to the present invention
2 is a schematic diagram of a dual band helical antenna of the present invention;
3 is an equivalent circuit of the present invention dual band helical antenna
4 is an operational state diagram of the dual-band helical antenna of the present invention
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a configuration and exploded view of a helical antenna applied to the present invention.
As shown in FIG. 1, the helical antenna is constructed by winding the conductor clockwise or counterclockwise, and has a shorter length than the linear monopole antenna and has a sinusoidal current distribution along the spiral, and the terminal impedance according to the frequency change. Is very sensitive and has a narrow bandwidth.
Radiation condition design of the helical antenna can be designed with three variables of diameter, pitch angle α, and the number of turns. The relationship between these variables is shown in Fig. 1 and can be obtained by equations (1) and (2).
Where C = circumference = πD, D = winding diameter, = pitch angle, A = antenna height (axial) = N s, d = diameter of the spiral conductor, respectively.
If the size of the helix is small compared to the wavelength, the maximum emission is in the direction perpendicular to the helix axis. In the far field, the electric field from the small dipole has only the E θ component and the electric field from the small loop antenna has only the Eφ component. In other words,
The ratio of the major axis and minor axis to the polarization ellipse of the field strength is called the axial ratio. The axial ratio of the spiral antenna operating in the vertical mode is as follows.
In order to operate with circular polarization, the axis ratio should be 1 as in the following equation.
The relation between pitch length (winding interval) s and diameter to form circular polarization is as follows.
Therefore, the circumferential length of the spiral for circular polarization is given by Eq. In addition, the radiation resistance of a small helical antenna can be obtained from Eq.
Therefore, the diameter of the helical antenna can be adjusted as in Eq. (10) in the range of k ≤ 0.5, and the total antenna length (wire length) can be obtained from Eq. (11).
Inherent inductance of helical antenna
Where K is the field strength factor dependent on the winding density.
Between the windings, there are capacitive components that occur between the micro wires.
From equations (12) and (13), the operating frequency of the helical antenna is given by
2 is a configuration diagram of a dual band helical antenna of the present invention, FIG. 3 is an equivalent circuit of the dual band helical antenna of the present invention, and FIG. 4 is a diagram illustrating an operation state of the dual band helical antenna of the present invention.
As shown in Figs. 2 and 3, the dual band helical antenna is composed of a tightly wound basic operating frequency (low frequency operating band F1 and a loosely wound high frequency operating band F2), and the tightly wound basic operation. Frequency (increasing and decreasing the frequency adjustment screw 3 at the end of the low frequency operating band (F1), and the portion connected to the tightly wound low frequency operating band (F1) and loosely wound high frequency operating band (F2) The
Therefore, the low frequency operating band F1 of the dual band helical antenna 1 is determined by the conductor length, and the high frequency operating band F2 is determined by the loosely wound winding, and thus the operating band F1 is determined. (F2) consists of two bands with pitch P1, number of turns N1, length L1 and pitch P2, number of turns N2, length L2, and the operating frequency is obtained by adjusting these variables.
Therefore, as shown in FIG. 4, when the length L1 and the pitch P of the antenna having the number of turns N are increased by the length L2 and the pitch P 'by Δ, the resonance frequency is
Increases by.
As a practical example, an antenna with a diameter of N = 50, length 65mm, and 0.8mm has a resonant frequency of 118MHz, and if it is increased to 80mm in length, it is increased to 122MHz and 128mm to increase in resonant frequency of 128MHz.
In this case, when the frequency of the single-band helical antenna, not the dual-band helical antenna 1, is to be increased or decreased, the length of the high frequency resonator is fixed while increasing / decreasing only with the increasing / reducing screw 3. In this case, it is carried out using two screws, first adjusting the increase and decrease screw (3) to come out the required high frequency oscillation frequency and then fastening the fixing screw (4) to fix the length of the high frequency resonator.
By adjusting the length of the high frequency resonator with the
One; Dual band helical antenna 3; Sensitization screw
4; Fixing screw
Claims (1)
The helical antenna includes an adjustment unit for varying the operating band and operating frequency by varying the length,
The adjusting unit includes a sensitizing screw at the end of the tightly wound low frequency operating band, and comprises a fixing screw in a portion where the tightly wound low frequency operating band and the loosely wound high frequency operating band are connected. Dual band helical antenna with fine tuning of operating frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140066056A KR102023911B1 (en) | 2014-05-30 | 2014-05-30 | Dual band Helical Antenna with fine tuning capability for operating frequencies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140066056A KR102023911B1 (en) | 2014-05-30 | 2014-05-30 | Dual band Helical Antenna with fine tuning capability for operating frequencies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20150138960A KR20150138960A (en) | 2015-12-11 |
| KR102023911B1 true KR102023911B1 (en) | 2019-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020140066056A KR102023911B1 (en) | 2014-05-30 | 2014-05-30 | Dual band Helical Antenna with fine tuning capability for operating frequencies |
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| KR (1) | KR102023911B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201800004603A1 (en) | 2018-04-17 | 2019-10-17 | Improved system for measuring temperature in a harsh atmosphere, receiving antenna |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060250319A1 (en) | 2005-05-06 | 2006-11-09 | Ooi Sooliam L | Antenna apparatus and method of forming same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980023441A (en) * | 1996-09-30 | 1998-07-06 | 정장호 | Dual helical antenna of dual band radiotelephone |
| KR20030077770A (en) * | 2002-03-27 | 2003-10-04 | 삼성전기주식회사 | Tripple band stubby antenna |
| US8665169B2 (en) * | 2006-10-26 | 2014-03-04 | Electronics And Telecommunications Research Institute | Monopole antenna |
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2014
- 2014-05-30 KR KR1020140066056A patent/KR102023911B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060250319A1 (en) | 2005-05-06 | 2006-11-09 | Ooi Sooliam L | Antenna apparatus and method of forming same |
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| KR20150138960A (en) | 2015-12-11 |
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