KR101688899B1 - Broad band balun and dipole antenna using the same elements - Google Patents

Broad band balun and dipole antenna using the same elements Download PDF

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KR101688899B1
KR101688899B1 KR1020150124644A KR20150124644A KR101688899B1 KR 101688899 B1 KR101688899 B1 KR 101688899B1 KR 1020150124644 A KR1020150124644 A KR 1020150124644A KR 20150124644 A KR20150124644 A KR 20150124644A KR 101688899 B1 KR101688899 B1 KR 101688899B1
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South Korea
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phase
signal
inductor
transmission line
capacitor
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KR1020150124644A
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Korean (ko)
Inventor
김홍준
한희제
박홍우
박순우
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경북대학교 산학협력단
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/42—Balance/unbalance networks
    • H03H7/422—Balance/unbalance networks comprising distributed impedance elements together with lumped impedance elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/18—Networks for phase shifting
    • H03H7/19—Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters

Abstract

The present invention relates to an ultra-small broadband balun that can output a balanced signal having a predetermined phase difference with respect to a wideband signal with a simple configuration using a lumped element and a wideband balun that can transmit and receive a wideband signal using such a wideband balun To a broadband dipole antenna.
The broadband dipole antenna according to the present invention is composed of a radiator which is formed in a dipole shape and transmits or receives a signal to the air and a broadband balun which distributes the input power so as to have a phase difference of 180 ° to provide the radiator, A phase shifter for converting an RF signal provided from a signal distributor into a balanced signal for maintaining a predetermined phase difference and outputting the RF signal, the phase shifter being connected to different output terminals of the signal distributor, Wherein the phase shifter includes a plurality of unit cells of a low pass filter structure including an inductor coupled in series with a first output terminal of the signal distributor and a capacitor coupled in parallel with the phase shifter, And the second phase transmission line is a signal It characterized in that a capacitor is coupled in series to the output end of the second exhaust gas, whereby a high-pass filter structure of the unit cell composed of an inductor coupled in parallel to this is made of a plurality of serially coupled form.

Figure R1020150124644

Description

A broadband balun and a broadband dipole antenna using the same,

The present invention relates to an ultra-small broadband balun that can output a balanced signal having a predetermined phase difference with respect to a wideband signal with a simple configuration using a lumped element and a wideband balun that can transmit and receive a wideband signal using such a wideband balun To a broadband dipole antenna.

Generally, an antenna is an element which is a medium that radiates radio waves from a radio communication to a predetermined space area or receives radio waves radiated from the radio communication, converts an electric signal inputted from a signal transmission line (feeder line) into radio wave energy, And performs the function of receiving the external wave energy by half-wavelength air conditioning, converting it into electric power, and outputting it to the signal receiving line (feeding line).

The dipole antenna (dipole antenna) is an antenna type in which an electric power line is distributed symmetrically about an axis when AC is applied to an open type conductor. And the length of one of the patterns is set to be a half wavelength of the wavelength of the reception object.

Such dipole antennas are mainly used for base station transmission / reception signals of mobile communication or wireless communication systems and are implemented in various forms in accordance with the rapid development of communication technology.

1, the dipole antenna includes a radiator 10 having a configuration in which a first antenna element 11 and a second antenna element 12 are symmetrical about an axis, And a balun 20 for providing a balancing signal having a phase difference of 180 ° between the first antenna element 11 and the second antenna element 12.

As shown in FIG. 1, the balun 20 generates a balanced signal having a phase difference of 180 degrees using a normal line length, and outputs the balanced signal to the first antenna element 11 and the second antenna element 12 Or a balanced signal having a phase difference of 180 degrees provided from the first antenna element 11 and the second antenna element 12 is synthesized and output.

On the other hand, in a wireless communication system, a communication field such as a PCS (Personal Communication System), a GPS (Global Position System), a wireless LAN and the like using satellites and a widening of mobile communication are required, Miniaturization characteristics of a broadband antenna are required while miniaturization of a terminal becomes a big issue.

However, as shown in FIG. 1, since the balun configured to set the phase difference using the length of the line on the substrate is limited in the reduction range for the size, the largest constraint .

Therefore, a broadband balun that has a wideband characteristic and provides a balanced signal having a certain phase difference is required.

1. Korean Patent Publication No. 2010-0058262 (entitled: Broadband Strip Balun and Length Variable Dipole Antenna Using the same) 2. Korean Registered Patent No. 1432748 (entitled "Small-Scale Resonant Antenna of LC (Inductor and Capacitor) Circuit")

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has a technical purpose of providing a balun having a small size and a wide band characteristic by combining and implementing a signal distributor and a phase shifter with a simple structure using a lumped element.

Another object of the present invention is to provide a wideband dipole antenna capable of transmitting and receiving a small-sized and wide-band signal by using an ultra small-sized wideband balun composed of a concentrated element as an antenna feeding portion.

According to an aspect of the present invention, there is provided a signal distributor comprising: a signal distributor for distributing and outputting RF signals to be supplied through different paths;
And a phase shifter connected to the different output terminals of the signal distributor and converting the RF signal provided from the signal distributor into a balanced signal maintaining a predetermined phase difference,
Wherein the phase shifter comprises a first phase transmission line in which a plurality of unit cells of a low-pass filter structure composed of an inductor coupled in series to a first output terminal of the signal distributor and a capacitor coupled in parallel to the first in- and,
And a second phase transmission line in which a plurality of unit cells of a high pass filter structure composed of a capacitor coupled in series with the second output terminal of the signal distributor and an inductor coupled in parallel thereto are coupled in series, Respectively,
For the first phase transmission line, the values of the capacitor (C R ) and the inductor (L R ) are set so as to satisfy the first characteristic impedance (Z OR ) and the first phase shift coefficient ( R ) wherein the capacitor 2 so as to satisfy the phase transfer to for the line impedance of the second characteristic, such as equation 2 (Z OL) and a second phase shift coefficients (β L) (C L) and an inductor, with as soon set (L L ) Element values are set so that 180 DEG phase shift relative to the wideband input signal is possible.
Equation 1

Figure 112016110805398-pat00018
,
Figure 112016110805398-pat00019

Equation 2
Figure 112016110805398-pat00020
,
Figure 112016110805398-pat00021

Here, omega is the frequency corresponding to the input RF signal.

Also, the first phase transmission line and the second phase transmission line are configured to output a balanced signal that maintains a phase difference of 180 DEG with respect to an RF signal to be input.

An inductor and a capacitor element value constituting a phase transmission line corresponding to a first phase coefficient calculated for a desired frequency band are set for any one of the first and second phase transmission lines And an inductor and a capacitor element value are set so as to correspond to a first phase coefficient calculated based on the remaining phase transmission lines and a second phase coefficient having a target phase difference.

The first phase transmission line may be composed of first to third inductors and first and second capacitors connected in parallel between the first to third inductors, 3 capacitors, and first and second inductors connected in parallel between the first to third capacitors.

The broadband balun is also characterized in that the signal distributor is comprised of a Wilkinson power divider.

According to another aspect of the present invention, there is provided a radiator including a radiator which is formed in a dipole shape and transmits or receives a signal to the air, and a radiator which distributes the input power so as to have a phase difference of 180 degrees, Balun,
The balun includes a signal distributor for distributing and outputting RF signals to be fed through different paths, a phase shifter for converting an RF signal provided from a signal distributor into a balanced signal maintaining a predetermined phase difference, Wherein the phase shifter is composed of a plurality of unit cells of a low-pass filter structure including a plurality of unit cells in series, each unit cell including an inductor coupled in series with a first output terminal of the signal distributor, and a capacitor coupled in parallel with the inductor. A plurality of unit cells of a high-pass filter structure composed of a first phase transmission line, a capacitor coupled in series with the second output terminal of the signal distributor, and an inductor coupled in parallel with the capacitor, 2 phase transmission line, and for the first phase transmission line, And a first characteristic impedance (Z OR), such as the equation (1), the addition soon as first phase shifting coefficient (β R) a capacitor (C R) and the inductor (L R) device is set so as to satisfy the said second phase transmission The capacitor C L and the inductor L L element values are set so as to satisfy the second characteristic impedance Z OL and the second phase shift coefficient L as shown in Equation 2 below, And a 180-degree phase shift is possible for the signal.
Equation 1

Figure 112016110805398-pat00022
,
Figure 112016110805398-pat00023

Equation 2
Figure 112016110805398-pat00024
,
Figure 112016110805398-pat00025

Here, omega is the frequency corresponding to the input RF signal.

Also, the present invention provides a broadband dipole antenna, wherein the balun is implemented as a lumped element on a substrate.

The phase shifter may further include an inductor and a capacitor element that constitute the phase transmission line so as to correspond to a first phase coefficient calculated for a desired frequency band with respect to any one of the phase transmission lines of the first or second phase transmission lines. And a value of an inductor and a capacitor element are set so as to correspond to a second phase coefficient having a phase difference of 180 degrees with a first calculated phase coefficient for the remaining phase transmission lines. do.

The first phase transmission line may be composed of first to third inductors and first and second capacitors connected in parallel between the first to third inductors, 3 capacitors, and first and second inductors connected in parallel between the first to third capacitors.

The broadband dipole antenna is also characterized in that the signal distributor comprises a Wilkinson power divider.

According to the present invention, it is possible to provide an ultra-small broadband balun that can easily provide a balanced signal having a constant phase difference with a simple configuration using a lumped element.

Further, by configuring the feeding part of the dipole antenna using the ultra-small wideband balun, it is possible to provide a broadband dipole antenna having a similar frequency bandwidth, maximum gain and radiation pattern to the conventional dipole antenna, and a smaller size .

1 is a view showing a conventional dipole antenna;
2 is a diagram for explaining a configuration of a wideband balun 100 according to a first embodiment of the present invention.
FIG. 3 illustrates the shape of the broadband balun 100 shown in FIG. 2; FIG.
4 shows unit cells of the first and second phase transmission lines 121 and 122 shown in Fig. 2; Fig.
5 is a view for confirming the size of the broadband balun 100 shown in Fig.
6 is a diagram illustrating a configuration of a wideband dipole antenna according to the present invention.
7 shows a dipole antenna shape implemented using the same radiator.
FIG. 8 is a view showing a result of measuring a phase difference, a return loss, a maximum gain, and a radiation characteristic for each frequency band of the dipole antenna shown in FIG. 7;

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wideband balun according to the present invention and a wideband dipole antenna using the same will be described with reference to the accompanying drawings.

2 and 3 are views for explaining the configuration of the wideband balun 100 according to the present invention. Fig. 2 is a circuit diagram of the broadband balun 100, and Fig. 3 is a diagram showing a structural configuration of the broadband balun 100 corresponding to the circuit diagram shown in Fig.

As shown in FIG. 2, the broadband balun 100 according to the present invention includes a signal distributor 110 and a phase shifter 120.

The signal distributor 110 performs a function of distributing the RF signal fed from the input terminal equally to two lines. For example, the signal distributor 110 may comprise a Wilkinson power splitter.

The signal distributor 110 has first and second transmission paths of a parallel structure with respect to an input terminal through which the RF signal is fed. At this time, the first and second transmission paths are coupled in parallel to the input terminal, and M inductors are coupled in series in the first and second transmission paths, and a capacitor whose other end is grounded is coupled between each inductor and the inductor .

2, the first to third inductors L 1 , L 2 and L 3 are coupled in series, and the first to third inductors L 1 , L 2 , L 3) the first and second capacitors (C 1, C 2) between be of a first and a second transmission path coupled in parallel form. At this time, a resistor R for impedance matching of the first and second transmission paths is connected in parallel to the output end of the first and second transmission paths. Here, the lumped elements constituting the signal distributor 110, that is, the inductor and the capacitor element value can be appropriately set according to the frequency band of the RF signal to be fed. For example, in FIG. 2, the first inductor L 1 is 1.2nH, the second inductor L 2 is 2.2nH, the third inductor L 3 is 1.2nH, (C 1 , C 2 ) are composed of first and second transmission paths each having an element value of "0.5 pF", and the first and second transmission path output terminals are connected in parallel with a resistance of "100 Ω" Dispenser 110 is shown.

2, the phase shifter 120 converts RF signals of different paths provided from the signal distributor 110 into a balanced signal maintaining a predetermined phase difference. For example, the phase shifter 120 may be configured to output a balanced signal having a phase difference of "180 ".

The phase shifter 120 includes N inductors connected in series to a first transmission path output terminal of the signal distributor 110 and a capacitor connected in parallel between the inductors and the inductors, And a second phase transmission line 122 in which N capacitors are serially coupled to an output terminal of the second transmission path of the signal distributor 110 and inductors of which one end is grounded are connected in parallel between the capacitors and the capacitors do.

At this time, the inductor and the capacitor element value of the first and second phase transmission lines 121 and 122 are set so as to correspond to the characteristic impedance and the phase coefficient calculated for the target frequency band. Here, the inductors and the capacitors constituting the first and second phase transmission lines 121 and 122 may be constituted by variable elements.

That is, first, the characteristic impedance corresponding to the cut-off frequency for the first phase transmission line 121 and the first phase coefficient are calculated, and a second phase having a desired phase difference, for example, a "180 & And sets the inductor and capacitor element values of the second phase transmission line 122 based on the coefficients. Therefore, the phase shifter outputs a balanced signal having a phase difference of "180 DEG" with respect to the wideband regardless of the frequency of the RF signal to be input.

4 is a view for explaining a process for calculating inductor and capacitor element values of the first and second phase transmission lines 121 and 122 of the phase shifter 120. Referring to FIG. 4A shows a unit cell structure corresponding to the first phase transmission line 121 and FIG. 4B shows a unit cell structure corresponding to the second phase transmission line 122. FIG.

4A) constituting the first phase transmission line 121 includes a low-pass filter structure including an inductor coupled in series with the input / output terminal and a capacitor coupled in parallel with the inductor. . 4A) of the first phase transmission line 121 is connected to two inductors L R / 2 in series with respect to the input and output terminals, and two inductors L R / 2) is coupled to a capacitor (C R ) whose other end is connected to ground. At this time, a first cutoff frequency f R Bragg , a first characteristic impedance Z OR and a first phase shift coefficient? R generated when the unit cell structure is connected to an infinite length are expressed by Equation 1 < / RTI >

Figure 112015085663626-pat00001

Figure 112015085663626-pat00002

Figure 112015085663626-pat00003

Here,? Is a frequency corresponding to the input RF signal.

That is, the first phase transmission line 121 sets the number of unit cells (A in FIG. 4) and the inductor and the capacitor element value appropriately so as to satisfy the above-described expression (1) for the frequency corresponding to the RF signal . For example, in FIG. 3, two unit cells are coupled in series to the signal distributor 100, so that the first inductor L 11 is 1.8 nH, the second inductor L 12 is 3.3 nH, The first phase transmission line 121 having an element value of "1.8 nH" for the inductor L 13 and an element value of "1.5 pF" for the first and second capacitors C 11 and C 12 is shown.

4B) constituting the second phase transmission line 122 includes a high-pass filter structure including a capacitor coupled in series to the input / output terminal and an inductor coupled in parallel to the input / output terminal . More specifically, a unit cell (FIG. 4B) constituting the second phase transmission line 122 is connected in series between two capacitors 2C L with respect to an output terminal, and is connected between two capacitors 2C L And an inductor L L whose other end is coupled to ground. The second block (cutoff) frequency (f L Bragg) and a second characteristic impedance (Z OL) and a second phase shift coefficients (β L) for said unit cell is calculated as in equation (2).

Figure 112015085663626-pat00004

Figure 112015085663626-pat00005

Figure 112015085663626-pat00006

At this time, the second phase shift coefficient for the second phase transmission line 122 is set to have a phase difference of 180 degrees with the first phase shift coefficient, and the second phase transmission line 122 is set to satisfy the second phase shift coefficient. (FIG. 4 (B)) and the inductor and the capacitor element value are determined. For example, in FIG. 3, two unit cells are coupled in series with respect to the output terminal of the signal distributor. The first capacitor C 21 is 4.7 pF, the second capacitor C 22 is 2.2 pF, (C 23) is "4.7pF", first and second inductor (L 21, L 22) of the second phase transmission line (122) having an element value of the "6.8nH" is shown.

FIG. 5 is a view for explaining the size of the broadband balun 100 shown in FIG. 3. The size of the broadband balun 100 according to the present invention is approximately 12 × 13.5 mm 2 , .

In the present invention, in calculating the element values of the first and second phase transmission lines, the element values for the second phase transmission line 122 are calculated first, and then the values of the elements of the second phase transmission line 122 It goes without saying that the element value of the first phase transmission line 121 can be set by calculating the first phase shift coefficient based on the two-phase displacement coefficient.

In the above description, the transmission process of separating and outputting the RF signal fed from the outside is described, but it is also possible to perform the reverse process using the same device. The detailed description thereof will be omitted.

Meanwhile, the wideband balun 100 according to the present invention can be applied to a dipole antenna that requires a phase difference of "180 DEG ".

6 is a diagram illustrating a configuration of a wideband dipole antenna according to the present invention.

6, the broadband dipole antenna according to the present invention includes a broadband balun 100 and a radiator 200. At this time, the balun 100 and the radiator 200 are embodied on the substrate 1.

The radiator 200 comprises a first antenna element 210 and a second antenna element 220 that are transmitted or received in the air, and are distributed symmetrically about an axis. At this time, the radiator 200 may be implemented on the substrate 1 as shown in FIG. It is needless to say that the shape of the radiator 200 is not limited to that shown in FIG. 6 but may be embodied in various shapes symmetrically.

The broadband balun 100 converts an RF signal supplied from the outside to have a phase difference of "180 DEG ", and then provides the RF signal to the first antenna element and the second antenna element 210 and 220 of the radiator 200, respectively. This can be implemented as shown in FIGS. 2 and 3, and a detailed description thereof will be omitted.

At this time, the broadband balun 100 may properly set the element values of the first phase transmission line 110 and the second phase transmission line 120 with respect to the fed RF signal so that the phase difference of "180 DEG" .

7 shows a dipole antenna shape implemented using the same radiator, in which (X) is a dipole antenna having a conventional microstrip type balun, and (Y) shows a broadband balun according to the present invention. Lt; / RTI > In this case, the device value of the wideband balun Y according to the present invention is as shown in FIG. 3, and the microstrip type balun of the conventional dipole antenna is configured to provide a balanced signal having a phase difference of 180 °.

As shown in FIG. 7, it can be seen that the dipole antenna Y according to the present invention is smaller in size than the conventional dipole antenna X.

FIG. 8 shows the results of measurement of the phase difference, return loss, maximum gain, and radiation pattern for each frequency band of the dipole antenna shown in FIG. In this case, the solid line is the measurement result of the conventional dipole antenna (Fig. 7 (X)), and the dotted line is the measurement result of the dipole antenna (Fig.

As shown in FIG. 8A, in a frequency band that satisfies the range of the phase difference of 180 ° ± 20 °, that is, the range of 160 ° to 200 °, the conventional dipole antenna has the frequency band of "1.71 GHz to 2.17 Quot; GHz ", whereas the dipole antenna according to the present invention has a frequency band of 1.19 GHz to 2.82 GHz, which indicates that the band maintaining a constant phase difference is a broad band.

As shown in FIG. 8B, in the frequency band satisfying the return loss of -10 dB, the bandwidth of the conventional dipole antenna is " 0.7 GHz "as" 1.79 GHz to 2.49 GHz " The bandwidth of the dipole antenna according to the present invention is "1.86 GHz to 2.57 GHz" and is similar to the "0.71 GHz"

As shown in FIG. 8C, the peak gain is similar to the maximum gain of the two antennas in the frequency range of 1.85 GHz to 2.5 GHz.

Also, as shown in Fig. 8D, the radiation patterns in the "1.95 GHz", "2.2 GHz" and "2.457 GHz" bands are also similar to the conventional dipole antenna and the dipole antenna according to the present invention.

That is, the dipole antenna according to the present invention can provide a dipole antenna having a very small size and a wideband bandwidth, a maximum gain, and a radiation pattern similar to those of a conventional dipole antenna using a wideband balun.

Therefore, according to the present invention, in reducing the size of the antenna, it is not necessary to pay attention to the size of the feed structure, but only the deformation of the dipole model can be considered.

 Meanwhile, the ultra-small broadband balun according to the present invention can be applied not only to a dipole antenna but also to various microwave circuits and systems requiring a balanced signal such as a balanced mixer or a balanced amplifier.

Also, the wideband balun according to the present invention can change the number of unit cells of the phase shifter and the element value constituting the phase transmission line to maintain a desired phase difference at a wide band.

100: broadband balun, 110: signal distributor,
120: phase shifter, 200: emitter,
L: inductor, C: capacitor,
R: Resistance.

Claims (10)

A signal distributor for distributing and outputting the fed RF signals in different paths,
And a phase shifter connected to the different output terminals of the signal distributor and converting the RF signal provided from the signal distributor into a balanced signal maintaining a predetermined phase difference,
Wherein the phase shifter comprises a first phase transmission line in which a plurality of unit cells of a low-pass filter structure composed of an inductor coupled in series to a first output terminal of the signal distributor and a capacitor coupled in parallel to the first in- and,
And a second phase transmission line in which a plurality of unit cells of a high pass filter structure composed of a capacitor coupled in series with the second output terminal of the signal distributor and an inductor coupled in parallel thereto are coupled in series, Respectively,
For the first phase transmission line, the values of the capacitor (C R ) and the inductor (L R ) are set so as to satisfy the first characteristic impedance (Z OR ) and the first phase shift coefficient ( R ) wherein the capacitor 2 so as to satisfy the phase transfer to for the line impedance of the second characteristic, such as equation 2 (Z OL) and a second phase shift coefficients (β L) (C L) and an inductor, with as soon set (L L ) Element values are set such that a 180 [deg.] Phase shift with respect to the broadband input signal is possible.
Equation 1
Figure 112016110805398-pat00026

Figure 112016110805398-pat00027

Equation 2
Figure 112016110805398-pat00028

Figure 112016110805398-pat00029

Here, omega is the frequency corresponding to the input RF signal. The method according to claim 1,
Wherein the first phase transmission line and the second phase transmission line are configured to output a balanced signal that maintains a phase difference of 180 degrees with respect to an RF signal to be input. The method according to claim 1,
An inductor and a capacitor element value constituting a corresponding phase transmission line are set so as to correspond to a first phase coefficient calculated for a desired frequency band with respect to any one of the phase transmission lines of the first or second phase transmission lines,
And an inductor and a capacitor element value are set so as to correspond to a second phase coefficient having a target phase difference and a first calculated phase coefficient for the remaining phase transmission lines. The method according to claim 1,
Wherein the first phase transmission line comprises first to third inductors and first and second capacitors connected in parallel between the first to third inductors,
Wherein the second phase transmission line comprises first to third capacitors and first and second inductors coupled in parallel between the first to third capacitors. The method according to claim 1,
Wherein the signal distributor comprises a Wilkinson power divider. And a balun which is formed in a dipole shape and emits or receives a signal to the air and a balun which divides the input power so as to have a phase difference of 180 degrees and provides the resultant to the radiator,
The balun includes a signal distributor for distributing and outputting RF signals to be fed through different paths, a phase shifter for converting an RF signal provided from a signal distributor into a balanced signal maintaining a predetermined phase difference, Wherein the phase shifter is composed of a plurality of unit cells of a low-pass filter structure including a plurality of unit cells in series, each unit cell including an inductor coupled in series with a first output terminal of the signal distributor, and a capacitor coupled in parallel with the inductor. A plurality of unit cells of a high-pass filter structure composed of a first phase transmission line, a capacitor coupled in series with the second output terminal of the signal distributor, and an inductor coupled in parallel with the capacitor, 2 phase transmission line, and for the first phase transmission line, And a first characteristic impedance (Z OR), such as the equation (1), the addition soon as first phase shifting coefficient (β R) a capacitor (C R) and the inductor (L R) device is set so as to satisfy the said second phase transmission The capacitor C L and the inductor L L element values are set so as to satisfy the second characteristic impedance Z OL and the second phase shift coefficient L as shown in Equation 2 below, Gt; 180 < / RTI >< RTI ID = 0.0 > phase < / RTI >
Equation 1
Figure 112016110805398-pat00030

Figure 112016110805398-pat00031

Equation 2
Figure 112016110805398-pat00032

Figure 112016110805398-pat00033

Here, omega is the frequency corresponding to the input RF signal. The method according to claim 6,
Wherein the balun is implemented as a lumped element on a substrate. The method according to claim 6,
Wherein the phase shifter includes an inductor and a capacitor element value constituting the phase transmission line so as to correspond to a first phase coefficient calculated for a desired frequency band with respect to any one of the first and second phase transmission lines Is set,
And an inductor and a capacitor element value are set so as to correspond to a second phase coefficient having a phase difference of 180 degrees with the first phase coefficient calculated for the remaining phase transmission lines. The method according to claim 6,
Wherein the first phase transmission line comprises first to third inductors and first and second capacitors connected in parallel between the first to third inductors,
Wherein the second phase transmission line comprises first to third capacitors and first and second inductors coupled in parallel between the first to third capacitors. The method according to claim 6,
Wherein the signal distributor comprises a Wilkinson power divider.
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US10608313B2 (en) 2018-01-08 2020-03-31 Linear Technology Holding Llc Wilkinson combiner with coupled inductors
US11005442B2 (en) 2019-05-23 2021-05-11 Analog Devices International Unlimited Company Artificial transmission line using t-coil sections
CN116470253A (en) * 2023-04-23 2023-07-21 南通至晟微电子技术有限公司 Compact balanced broadband filter

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KR20100058262A (en) * 2008-11-24 2010-06-03 한국전자통신연구원 Wideband stripline bal-un and variable dipole antenna using the same
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KR101432748B1 (en) 2013-03-18 2014-08-20 서강대학교산학협력단 Compact Zeroth-Order Resonant (ZOR) Antennas with LC Circuits

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KR20100058262A (en) * 2008-11-24 2010-06-03 한국전자통신연구원 Wideband stripline bal-un and variable dipole antenna using the same
KR20130122761A (en) * 2010-11-29 2013-11-08 더 유니버시티 오브 버밍험 Balanced antenna system
KR101432748B1 (en) 2013-03-18 2014-08-20 서강대학교산학협력단 Compact Zeroth-Order Resonant (ZOR) Antennas with LC Circuits

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10608313B2 (en) 2018-01-08 2020-03-31 Linear Technology Holding Llc Wilkinson combiner with coupled inductors
US11005442B2 (en) 2019-05-23 2021-05-11 Analog Devices International Unlimited Company Artificial transmission line using t-coil sections
CN116470253A (en) * 2023-04-23 2023-07-21 南通至晟微电子技术有限公司 Compact balanced broadband filter
CN116470253B (en) * 2023-04-23 2023-10-31 南通至晟微电子技术有限公司 Compact balanced broadband filter

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