KR101882411B1 - Compact Band-Pass Power Divider with Ultra-Wide Band Harmonic Suppression - Google Patents

Abstract

The present invention relates to a compact band pass power divider for suppressing ultra-wideband harmonic components, comprising: an input port having port 1; a frequency-selecting coupling structure (FSCS) unit having an open circuit resonator at a lower end thereof; an ultra-wideband harmonic component suppression unit; an output port; and two folded short ended stub resonators.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compact band-pass power divider that suppresses an ultra-wideband harmonic component,

The present invention uses a frequency-selecting coupling structure (FSCS) to suppress 2.45 GHz bandpass characteristics and ultra-wideband harmonic components that suppress DC, 3f ₀ , 5f ₀ and 7f ₀ ultra wideband harmonic components (Ultra-Wide Band Harmonic Suppression) small-band pass power divider.

The Wilkinson Power Divider (WPD) is a basic microwave component and is widely used in modern radio frequency (RF) / microwave systems. In such a system, the WPD is always connected to a bandpass or low-pass filter to block undesired frequency components generated by other parts of the circuit [1]. Several methods have been proposed to realize the harmonic suppression and bandpass characteristics of WPD itself [2]. We implemented the DC block characteristics by applying a coupling line at all ports of WPD. In [3], a harmonic suppression ring resonator is applied to remove harmonic components. [4-6] replaces the quarter-wave transmission line of the WPD with an advanced circuit to realize the harmonic suppression characteristic.

As a prior art 1 related to a power divider, Patent Publication No. 10-10700090000 discloses a " 1: 2 super wide band power divider / combiner improved in isolation degree ", and a short circuit line which is capacitively coupled to a transmission line The present invention provides an ultra-wideband power divider / combiner that can adjust the bandwidth of an input or output signal using an ultra wide band and isolate the transmission lines from each other to improve stability.

The UWB power divider can adjust the magnitude of the capacitive coupling between the transmission line and the shorting line so that the bandwidth of the input / output signal can be precisely set to the desired UWB. This ultra wide band power divider also improves the degree of isolation between the transmission lines on which signals are outputted by inserting isolation resistors between the transmission lines on which signals are output.

As a related art 2, Patent Publication No. 10-10700350000 discloses an "ultra-wideband power divider / combiner ", and two T-shaped transmission line portions having transmission lines of? / 4 length are capacitively coupled to each other, The present invention relates to an ultra wideband (UWB) system for distributing the size of an output signal or combining an input signal using a short-circuited line having a length of? / 2 which is capacitively coupled to a transmission line so as to control a bandwidth and an attenuation pole of each transmission line. Power divider / combiner.

Accordingly, the UWB power divider can control the magnitude of the capacitive coupling between the transmission line and the shorting line, thereby accurately setting the bandwidth of the input / output signal to the desired UWB. In addition, the UWB power divider capacitively couples two T-shaped transmission line sections and capacitively couples the transmission line and the shorting line of each T-shaped transmission line section, so that the magnitude of the capacitive coupling of the T- It is possible to control the magnitude of the output signal to be evenly or variably controlled by adjusting the magnitude of the capacitive coupling between the transmission line and the shorting line of each T-shaped transmission line portion to be different from each other.

Patent Registration No. 10-10700090000 (Date of Registration September 27, 2011), "1: 2 Ultra-Wideband Power Splitter / Coupler with Improved Isolation", Kyung Hee University Industry-Academic Cooperation Foundation Patent Registration No. 10-10700350000 (Registration date September 27, 2011), "1: 3 second broadband power distributor / coupler", Kyung Hee University Industry-Academic Cooperation

 N. Bourhill, S. Iezekiel and D. P. Steenson, "A balanced self-oscillating mixer," IEEE Microwave and Guided Wave Letters, vol. 10, no. 11, pp. 481-483, Nov. 2000.  M. A. Maktoomi, M. S. Hashmi and F. M. Ghannouchi, "Theory and Design of a Novel Wideband DC Isolated Wilkinson Power Divider," IEEE Microwave and Wireless Components Letters, vol. 26, no. 8, pp. 586-588, Aug. 2016.  S. S. Gao, S. Sun and S. Xiao, "A Novel Wideband Bandpass Power Divider With Harmonic-Suppressed Ring Resonator," IEEE Microwave and Wireless Components Letters, vol. 23, no. 3, pp. 119-121, March 2013.  E. N. Mohamed, A. G. Sobih and A. M. El-Tager, "Compact wilkinson power divider with inductively loaded microstrip line for harmonic suppression," 2016 IEEE Middle East Conference on Antennas and Propagation (MECAP), Beirut, Lebanon, 2016, pp. 1-4.  J. Zhang, L. Li, J. Gu and X. Sun, "Compact and Harmonic Suppression Wilkinson Power Divider with Short Circuit Anti-Coupled Line," IEEE Microwave and Wireless Components Letters, vol. 17, no. 9, pp. 661-663, Sept. 2007.  R. Mirzavand, M. M. Honari, A. Abdipour and G. Moradi, "Compact Microstrip Wilkinson Power Dividers With Harmonic Suppression and Arbitrary Power Division Ratios," IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 1, pp. 61-68, Jan. 2013.  M. Y. Hsieh and S. M. Wang, "Compact and wideband microstrip bandstop filter," IEEE Microwave and Wireless Components Letters, vol. 15, no. 7, pp. 472-474, July 2005.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art by using a frequency-selecting coupling structure (FSCS) to convert a 2.45 GHz band pass characteristic and DC, 3f ₀ , 5f ₀ and 7f ₀ ultra broadband harmonic components (Band-Pass Power Divider) that suppresses the ultra-wide band harmonic suppression (EMI).

The present invention proposes a 2.45 GHz bandpass power divider having ultra-wideband harmonic suppression characteristics. The DC component and the 3, 5, and 7th harmonic components of the bandpass power divider (WPD) with a center frequency of 2.45 GHz are suppressed.

In order to achieve the object of the present invention, a small bandpass power divider for suppressing an ultra-wideband harmonic component comprises: an input port provided on a substrate and having a port 1; A frequency-selecting coupling structure (FSCS) unit provided on the substrate and having an open circuit resonator at the bottom; An ultra-wideband harmonic component suppressor provided on the substrate and suppressing the center frequency (f ₀ ) reference 3f ₀ , 5f ₀ and 7f ₀ harmonic components of the band-pass power divider; An output port provided on the substrate and having ports 2 and 3; And a transmission line provided on the substrate and provided under the ultra-wideband harmonic suppressing part and connected to the transmission line through a stub, blocking the DC and low-frequency components and controlling the bandwidth, And two folded short ended stub resonators as stubs (GND) grounded at the ends of the output ports (port 2, port 3).

The substrate uses a Teflon substrate having a dielectric constant ( _r = 2.54) of 2.54 and a thickness of 0.54 mm.

The center frequency of the bandpass power divider uses 2.45 GHz as the operating frequency.

The overall size of the bandpass power splitter is 14.65 mm x 19.64 mm, corresponding to 0.12? G x 0.16? G.

의 특성 임피던스를 갖는 λ/4 파장 전송라인(transmission line) 역할을 하면서 초 광대역 정지 대역(Ultra-wide stop band)을 제공한다. Wherein the ultra wideband harmonic component suppressing unit comprises:

And provides an ultra-wide stop band while serving as a? / 4 wavelength transmission line having a characteristic impedance of?

The FSCS unit exhibits a very wide stop band around the center frequency of the stop band of the FSCS unit, fs, and when the electrical length is theta, ? =? / 2,

The even mode and odd mode analysis methods are used to study the characteristics of the FSCS unit and the even-mode and odd-mode input impedance of the circuit is derived as follows:

(1a)

(1a)

(1b)

(1b)

(1c)

(1c)

Where Zr is the characteristic impedance of the open-circuited stub, Z1e and Z1o are the even mode and odd mode characteristic impedances of the coupled line parts, and the even mode and odd mode impedances are the Fs is the center frequency of the stopband of the FSCS unit, that is, the band pass power divider (WPD) (Harmonic suppression band).

The FSCS unit

In case of the stop band characteristic, the transmission zero can set S ₂₁ to 0, and the insertion loss for the input signals of the port 2 and port 3 output ports are S ₂₁ and S ₃₁ , respectively, and S ₂₁ is calculated by the following equation,

(2)

(2)

Where Γe is the even-mode reflection coefficient, Γo is the odd-mode reflection coefficient,

Z _o is the output characteristic impedance of the FSCS, Zine is the even-mode input impedance, Zino is the odd-mode input impedance,

For the passband characteristic, the equivalent electrical length, φ, of the FSCS unit in the passband of the structure and the equivalent characteristic impedance Zc can be derived as follows:

(3a)

(3a)

(3b)

(3b)

Where Z _1e is an even-mode impedance, Z _1o is an odd-mode impedance, θ is an electrical length, Z _L is an open stub, Load impedance Z _r is the characteristic impedance of the open circuit stub Zine is the even-mode input impedance Zino is the odd-mode input impedance ) And ZLe is an even-mode load impedance of an open stub.

The harmonic suppression component of the UWB harmonic suppressor

1) Calculate Zc of the port impedance Z _o of the band-pass power divider (WPD)

2) In the FSCS unit, the electrical lengths θ _pass and φ of the _pass band are determined by the equivalent electrical length and the equivalent characteristic impedance,

3) calculate the required electrical length of the preceding transmission line to satisfy? =? / 2;

4) calculate the center frequency fs of the stop band of the FSCS unit;

(4)

(4)

Where f _o is the center frequency of the bandpass power divider,

This translates to the actual size.

The FSCS unit is configured on a Teflon substrate, with a lattice-shaped stub, an inverted stub, and an open circuit stub

The short-stub resonator (short ended resonators) has two output ports port2, are connected in parallel at the end of the third center frequency f _o electric length (electrical length), based on the (operating frequency = 2.45 GHz) of the band-pass power divider / RTI > is < RTI ID = 0.0 > pi / 2, < / RTI > blocks DC and low frequency components and generates an additional "transmission zero"

The bandwidth of the bandpass power divider is determined by the width and length of the resonator, whose width affects the quality factor (Q) and whose length affects the "transmission zero & of the resonators.

By using the frequency-selecting coupling structure (FSCS) according to the present invention, it is possible to suppress an ultra-wideband harmonic component that suppresses 2.45 GHz band pass characteristics and DC, 3f ₀ , 5f ₀ and 7f ₀ ultra broadband harmonic components To a small band-pass power divider (Ultra-Wide Band Harmonic Suppression).

The present invention proposes a band-pass power divider having 2.45 GHz band pass characteristics and ultra-wideband harmonic suppression. The frequency-selective coupling structure (FSCS) is built into the existing 1/4 wavelength transmission line and provides Ultra-Wide Band Harmonic Suppression with three "transmission zeros" Respectively. A short ended meander line stub shunts the line at the two output ports (port2, port3) of the DC block and provides an additional transmission zero for the passband. The proposed bandpass power divider operates at -20dB bandwidth from 1.74 to 3.71GHz using an ultra-wide stop band to suppress DC, 3f ₀ , 5f ₀ and 7f ₀ harmonic components. The proposed bandpass power divider is compact in size of 14.65mm x 19.64mm (0.19λg x 0.25λg).

1 is an equivalent circuit diagram of a bandpass power divider (WPD) proposed in the present invention.
Figure 2 shows (a) the circuit structure of the FSCS unit; (b) an equivalent circuit model of even-mode excitation; (c) An equivalent circuit model of odd-mode excitation.
3 is a diagram showing the equivalent electrical length and the equivalent characteristic impedance of the proposed FSCS unit.
4 shows (a) the arrangement of the designed harmonic suppression component and (b) the simulation result of the harmonic suppression component.
5 is a photograph of a band-pass power divider (Ultra-Wide Band Harmonic Suppression) suppressing an ultra-wideband harmonic component according to an embodiment of the present invention.
6 shows (a) simulation and measured performance in the entire band with a center frequency of 2.45 GHz, and (b) simulation and measurement performance in the operating frequency band.

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

The present invention relates to an ultrawideband harmonic generator which suppresses 2.45 GHz bandpass characteristics and DC components using a frequency-selecting coupling structure (FSCS) and suppresses 3f ₀ , 5f ₀ and 7f ₀ ultra wideband harmonic components. To a small band-pass power divider (Ultra-Wide Band Harmonic Suppression).

The present invention proposes a band-pass power divider having 2.45 GHz band pass characteristics and ultra-wideband harmonic suppression. The frequency-selective coupling structure (FSCS) is built into the existing 1/4 wavelength transmission line and has implemented ultra-wideband harmonic suppression with three "transmission zeros". A short ended meander line stub provides additional "transmission zero" for the pass band by shunting the lines at the two output ports (port2, port3) of the DC block do. The band-pass power divider proposed in the present invention uses the ultra-wide stop band to suppress the DC component and to suppress the harmonics components of 3f ₀ , 5f ₀ and 7f ₀ to 1.74 to 3.71 GHz - It operates at a 20dB bandwidth. The proposed bandpass power divider is compact in size of 14.65mm x 19.64mm (0.19λg x 0.25λg).

II. Analysis and Design

1 is an equivalent circuit diagram of a bandpass power divider (WPD) proposed in the present invention.

의 특성 임피던스를 갖는 λ/4 파장 전송라인(transmission line) 역할을 하면서 초 광대역 정지 대역을 제공한다. 단락 스터브(short ended stub)는 두 출력 포트(port2, port3)에 배치되며, DC 및 저주파 구성 요소를 차단하고 대역폭을 제어하여 통과 대역에서 추가 "송신 0(transmission zero)"를 생성한다.The harmonic suppression component is used in place of the 1/4 wavelength transmission line in the conventional WPD. They are in the pass band

/ 4 wavelength transmission line having a characteristic impedance of < RTI ID = 0.0 > 1/2 < / RTI > A short-ended stub is placed on two output ports (port2, port3), blocking DC and low-frequency components and controlling the bandwidth to create an additional "transmission zero" in the passband.

An object of the present invention is to provide a small bandpass power divider for suppressing an ultra-wideband harmonic component, comprising: an input port provided on a substrate and connected to a transmission line and having a port 1; A frequency-selecting coupling structure (FSCS) unit provided on the substrate and having an open circuit resonator at the lower end thereof; An ultra-wideband harmonic component suppressor provided on the substrate and suppressing the center frequency (f ₀ ) reference 3f ₀ , 5f ₀ and 7f ₀ harmonic components of the band-pass power divider; An output port provided on the substrate and connected to the transmission line and having port 2, port 3; And a transmission line provided on the substrate and provided under the ultra-wideband harmonic suppressing part and connected to the transmission line through a stub, blocking the DC and low-frequency components and controlling the bandwidth, And two folded short ended stub resonators as stubs (GND) grounded at the ends of the output ports (port 2, port 3).

The substrate uses a Teflon substrate having a dielectric constant ( _r = 2.54) of 2.54 and a thickness of 0.54 mm.

The center frequency of the bandpass power divider uses 2.45 GHz as the operating frequency.

The overall size of the bandpass power splitter is 14.65 mm x 19.64 mm, corresponding to 0.12? G x 0.16? G.

의 특성 임피던스를 갖는 λ/4 파장 전송라인(transmission line) 역할을 하면서 초 광대역 정지 대역(Ultra-wide stop band)을 제공한다. Wherein the ultra wideband harmonic component suppressing unit comprises:

And provides an ultra-wide stop band while serving as a? / 4 wavelength transmission line having a characteristic impedance of?

FIG. 2 illustrates a circuit structure of (a) a frequency-selecting coupling structure (FSCS) device; (b) an equivalent circuit model of even-mode excitation; (c) An equivalent circuit model of odd-mode excitation.

A. Harmonic Suppression Components

The harmonic suppression component comprises a frequency selective combining structure (FSCS) unit; The FSCS consists of two preceding transmission lines, which are key components in providing harmonic suppression. The FSCS unit can provide an ultra-wideband stop band with three "transmission zeros" in a simple structure and compact size [7]. The structure of the FSCS unit having the equivalent characteristic impedance Zc and equivalent electrical length? Is shown in Fig. 2 (a).

The even-mode and odd-mode equivalent circuits are shown in Fig.

port1 is the input port, and port2 and port3 are the output ports.

An even-mode signal is an in-phase signal of the same phase.

An odd-mode signal is a signal whose phase is opposite.

Figure 2 shows (a) the circuit structure of the FSCS unit; (b) an equivalent circuit model of even-mode excitation; (c) An equivalent circuit model of odd-mode excitation.

And an FSCS unit having a 1/4 wavelength open circuit resonator. Conventional methods of conventional even-mode and odd-mode excitations can be used in the structure of FIG. 1 (b). θ is the electrical length, and the upper and lower electrical lengths are λ / 4, respectively. The coupling effect, characteristic impedance and electrical line of the 1/4 wavelength selective coupling structure affect the characteristics (bandwidth, operating frequency and Q factor) of the power distributor, You can adjust by changing the length and width.

The FSCS unit exhibits a very wide stop band around the center frequency of the stop band of the FSCS unit, fs, and the electrical length in Figure 2 (a) θ, then θ = π / 2 [7].

The even mode and odd mode analysis methods can be used to study the characteristics of FSCS units. The even-mode and odd-mode input impedances of the circuit can be derived as follows.

(1a)

(1a)

(1b)

(1b)

(1c)

(1c)

Zr is the characteristic impedance of the open-circuited stub, and Z1e and Z1o are the even mode and odd mode characteristic impedances of the coupled line parts. The even mode and odd mode impedance are a function of θ. is the electrical length calculated based on fs, where fs is the center frequency of the stopband of the FSCS unit, i. e., the bandpass power divider of the present invention And a harmonic suppression band (WPD).

In the case of the stop band characteristic, "transmission zero" can set S ₂₁ to zero. Here, the insertion loss for input signals of port 2 and port 3 are S ₂₁ and S _31, respectively. S ₂₁ is calculated by the following equation.

(2)

(2)

Where Γe is the even-mode reflection coefficient, and Γo is the odd-mode reflection coefficient.

Z _o is the output characteristic impedance of the FSCS, Zine is the even-mode input impedance, and Zino is the odd-mode input impedance.

For passband characteristics, the equivalent electrical length of the FSCS unit in the passband of the structure, φ, and the equivalent characteristic impedance, Zc, can be derived as follows:

(3a)

(3a)

(3b)

(3b)

Where Z _1e is an even-mode impedance, Z _1o is an odd-mode impedance, θ is an electrical length, Z _L is an open stub, Load impedance Z _r is the characteristic impedance of the open circuit stub Zine is the even-mode input impedance Zino is the odd-mode input impedance ) And ZLe is the even-mode load impedance of the open stub.

Harmonic suppression components are used to eliminate inevitable errors between computation and simulation / production. Since the relationship between circuit values and physical size is complex, it is difficult to always correct errors by adjusting only the structure of FSCS itself. The advantage of using this leading line is that it provides greater design freedom since it is not necessary to set the phase delay of the FSCS to a critical? / 2 at the passband's operating frequency.

B. Circuit design

The equivalent electrical length φ of the frequency-selecting coupling structure (FSCS) device for the electrical length θ and the equivalent characteristic impedance Zc are shown in FIG. Z1e, Z1o and Zr are set to 178.8?, 87.4? And 65?, Respectively. The middle part is the stop band of the FSCS unit around the very wide stopband fs. The values of φ and Zc are meaningful beyond the stopband area.

The harmonic suppression component of the UWB harmonic suppression component is designed by the following procedure.

1) Calculate the required impedance Z _o of the port impedance Z _o of the bandpass power divider (WPD) of the present invention;

2) In FIG. 3, the electrical lengths? _Pass and? Of the _pass band are determined by the equivalent electrical length and the equivalent characteristic impedance in the FSCS unit;

3) Calculate the required electrical length of the preceding transmission line to satisfy φ = π / 2;

4) Calculate the center frequency fs of the stop band of the FSCS unit;

(4)

(4)

Where f _o is the center frequency of the bandpass power divider.

5) Convert all values to actual size.

3 is a diagram showing the equivalent electrical length and the equivalent characteristic impedance of the proposed FSCS unit.

4 shows (a) the arrangement of the designed harmonic suppression component and (b) the simulation result of the harmonic suppression component.

On a Teflon substrate, the FSCS unit consists of a Lap-shaped stub, an inverted stub and an open circuit stub.

The designed layout of the harmonic suppression component and simulation results show that the port impedance of Figure 4 is all set to 70.7 Ω. It is possible to provide a wide stopband from 6.5 to 18 GHz with an insertion loss of less than -10 dB while providing an equivalent electrical length of? / 2 at the center frequency of the 2.45 GHz bandpass power splitter .

Also, short ended resonators are connected in parallel at the ends of the two output ports as shown in FIG. The electrical length is π / 2 based on the center frequency (operating frequency) f _o of the bandpass power divider (operating frequency f ₀ = 2.45 GHz). Block DC and low frequency components, and create an additional "transmission zero" in the operating frequency band. The bandwidth of the bandpass power splitter (WPD) depends on the width and length (width) of the resonator, whose width affects the quality factor (Q) and whose length affects the "transmission zero" and length of the resonators.

III. Simulation and measurement results

The proposed bandpass power divider is designed on a Teflon substrate with a dielectric constant (ε _r = 2.54) of 2.54 and a thickness of 0.54 mm. ANSYS Electronics Desktop (HFSS) software is used for simulation and measurements are completed on Agilent Vector Network Analyzer (VNA).

5 is a photograph of a band-pass power divider (Ultra-Wide Band Harmonic Suppression) suppressing an ultra-wideband harmonic component according to an embodiment of the present invention.

A small bandpass power divider that suppresses the ultra-wideband band harmonic component is a 3 port type power divider. It has a port1 input port on the center part and a port 2 and port3 on the right and left side on the Teflon substrate. The meander line structure of the FSCS unit for suppressing the defects is characterized by being opposed to each other in parallel.

A quarter-wavelength frequency-selective coupling structure (FSCS) having an open circuit resonator is provided on the front surface of the Teflon substrate, and a ground (GND) as a copper foil is provided on the rear surface.

5 is a photograph of the fabricated bandpass power divider. includes two harmonic suppression components instead of a lambda / 4 wavelength transmission line and two folded short ended stub resonators at the end of the output port. The overall size of the bandpass power splitter is 14.65 mm x 19.64 mm, corresponding to 0.12? G x 0.16? G.

6 shows simulation and measured performance in the entire band with (a) the center frequency f ₀ = 2.45 GHz of the bandpass power divider, and (b) simulation and measurement performance in the operating frequency band.

The simulated and measured scattering parameters are shown in Fig. The measured -20 dB bandwidth is 1.74 to 3.71 GHz, and if the insertion loss S ₂₁ , S ₃₁ exceeds -3.4 dB in the operating frequency band, the phase difference between port 2 and port 3 is less than 4 °. A very wide harmonic suppression band is generated between 4.81 and 19.92 GHz and the insertion loss is less than -12 dB. All 3f _o , 5f _o, and 7f _o components are not well controlled. The isolation between port 2 and port 3 is less than -11.77 dB in the operating frequency band and -17 dB at 2.45 GHz. Simulation results and measured results are in good agreement. Finally, a comparison of the proposed band-pass power divider (WPD) with other PCB based designs is shown in Table 1. The proposed bandpass power divider (WPD) shows the widest passband and the smallest suppression component.

IV. conclusion

The present invention proposes a band-pass power divider having Ultra-Wide Band Harmonic Suppression. In the bandpass power divider, the operating frequency is good from 1.74 to 3.71 GHz and the DC components, 3f _o , 5f _o and 7f _o harmonic components are well suppressed. Theories, simulations, and experiments were proposed and evaluated in this study.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and changes may be made without departing from the scope of the present invention.

port 1: input port port2,3: output port
FSCS: frequency-selecting coupling structure
f _o : Center frequency of bandpass power divider (operating frequency = 2.45 GHz)
fs: center frequency of the stop band of the FSCS unit
(center frequency of the stopband of FSCS unit)
Γe: even-mode reflection coefficient Γo: odd-mode reflection coefficient
Z _o : Output characteristic impedance of FSCS
Zine: even-mode input impedance
Zino: odd-mode input impedance (even-mode input impedance)
Z _1e : even-mode impedance
Z _1o : odd-mode impedance (even-mode impedance)
θ: Electrical length
Z _L : Load impedance of the open stub.
Z _r is the characteristic impedance of the open circuit stub,
ZLe: Even-mode load impedance of the open stub.

Claims (10)

An input port provided on the substrate and having a port 1;
A frequency-selecting coupling structure (FSCS) unit provided on the substrate and having an open circuit resonator at the bottom;
An ultra-wideband harmonic component suppressor provided on the substrate and suppressing the center frequency (f ₀ ) reference 3f ₀ , 5f ₀ and 7f ₀ harmonic components of the band-pass power divider;
An output port provided on the substrate and having ports 2 and 3; And
And is provided on the substrate and is provided below the UWB harmonic suppression unit and connected to the transmission line through a stub, and further includes a transmission " zero "in the pass band by blocking the DC and low- Two folded short ended stub resonators as a stub (GND) grounded at the ends of the output ports (port 2, port 3);
Band harmonic components. ≪ RTI ID = 0.0 > [10] < / RTI > The method according to claim 1,
Wherein the substrate is a Teflon substrate having a dielectric constant (epsilon _r = 2.54) of 2.54 and a thickness of 0.54 mm. The method according to claim 1,
Wherein the center frequency of the bandpass power divider uses 2.45 GHz as the operating frequency. The method of claim 3,
Wherein the total size of the bandpass power splitter is 14.65 mm x 19.64 mm, corresponding to 0.12? G x 0.16? G, wherein the ultra-wideband harmonic components are suppressed. The method of claim 3,
The ultra-wideband harmonic component suppressing unit
In the pass band

Band narrow band passband power divider that suppresses ultrawideband harmonic components while providing an ultra-wide stop band while serving as a lambda / 4 wavelength transmission line having a characteristic impedance. The method according to claim 1,
The FSCS unit exhibits a very wide stop band around the center frequency of the stop band of the FSCS unit, fs, and when the electrical length is theta, ? =? / 2,
The even mode and odd mode analysis methods are used to study the characteristics of the FSCS unit and the even-mode and odd-mode input impedance of the circuit is derived as follows:

(1a)

(1b)

(1c)
Where Zr is the characteristic impedance of the open-circuited stub, Z1e and Z1o are the even mode and odd mode characteristic impedances of the coupled line parts, and the even mode and odd mode impedances are the Fs is the center frequency of the stopband of the FSCS unit, that is, the band pass power divider (WPD) Wherein the harmonic suppression band is a harmonic suppression band of the small bandpass power divider. The method according to claim 6,
The FSCS unit
In case of the stop band characteristic, the transmission zero can set S ₂₁ to 0, and the insertion loss for the input signals of the port 2 and port 3 output ports is S ₂₁ and S ₃₁ , respectively, and S ₂₁ is calculated by the following equation,

(2)
Where Γe is the even-mode reflection coefficient, Γo is the odd-mode reflection coefficient,
Z _o is the output characteristic impedance of the FSCS, Zine is the even-mode input impedance, Zino is the odd-mode input impedance,
For the passband characteristic, the equivalent electrical length, φ, of the FSCS unit in the passband of the structure and the equivalent characteristic impedance Zc can be derived as follows:

(3a)

(3b)
Where Z _1e is an even-mode impedance, Z _1o is an odd-mode impedance, θ is an electrical length, Z _L is an open stub, Load impedance Z _r is the characteristic impedance of the open circuit stub Zine is the even-mode input impedance Zino is the odd-mode input impedance ) And ZLe is an even-mode load impedance of an open stub. The small band-pass power divider suppresses an ultra-wideband harmonic component. The method according to claim 1,
The harmonic suppression component of the ultra-wideband harmonic component suppressor
1) Calculate Zc of the port impedance Z _o of the band-pass power divider (WPD)
2) In the FSCS unit, the electrical lengths θ _pass and φ of the _pass band are determined by the equivalent electrical length and the equivalent characteristic impedance,
3) calculate the required electrical length of the preceding transmission line to satisfy? =? / 2;
4) calculate the center frequency fs of the stop band of the FSCS unit;

(4)
Where f _o is the center frequency of the bandpass power divider,
A small bandpass power divider that suppresses the ultra-wideband harmonic component, which converts it to the actual size. The method according to claim 1,
The FSCS unit is configured on a Teflon substrate, consisting of a ladder-type stub, an inverted stub, and an open circuit stub, which suppresses an ultra-wideband band harmonic component. The method according to claim 1,
The short ended resonators are connected in parallel at the ends of the two output ports ports 2 and 3,
The electrical length is π / 2 based on the center frequency f _o of the bandpass power distributor (operating frequency = 2.45 GHz), the DC and low frequency components are blocked, and the additional "transmit 0 quot; transmission zero "
The bandwidth of the bandpass power divider is determined by the width and length of the resonator, whose width affects the quality factor (Q) and whose length affects the "transmission zero & of the resonators that can be adjusted by a small bandpass power divider that suppresses ultra-wide band harmonic components.

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