KR20070113181A - Circulator using ferrite disk on non-radiative microstrip line - Google Patents

Abstract

A circulator using a ferrite disk for a non-radiative microstrip line is provided to induce the saturation magnetization of the ferrite disk by inserting ferromagnetic permanent magnets into holes of the upper surface and the lower surface of upper and lower conductive plates. A circulator using a ferrite disk for a non-radiative microstrip line includes a dielectric substrate(3), and a ferrite disk(4). The dielectric substrate is formed between an upper conductive plate(1) and a lower conductive plate(2) which have the interval under the half wavelength of a use frequency, and has microstrip lines(5,6,7) of an input port, an output port, and a block port at the interval of 120 degrees. The ferrite disks are attached on the upper surface and the lower surface of the dielectric substrate with respect to a center disk which is contacted with each port of the microstrip line, and have a diameter which is adjusted according to a resonance characteristic, and a thickness(t) which is under lambda/4. The upper and lower conductive plates are located on the upper and lower surfaces of the ferrite disk, and have holes for inserting ferromagnetic permanent magnets on the upper surface and the lower surface.

Description

Circulator using Ferrite Disk on Non-Radiative Microstrip Line}

1: Perspective view of the structure of a circulator for a non-radiating microstrip line using a ferrite disk

Fig. 2: Top view of the shuffler structure for the non-radiative microstrip line

Figure 3: Insertion loss characteristic data according to the thickness change of the ferrite disk

Figure 4: Electromagnetic wave simulation for input port to output port

Fig. 5: Transmission characteristic data for input port to output port

Fig. 6: Electromagnetic wave simulation for output port vs. blocking port

Fig. 7: Transmission characteristic data for output port to blocking port

Fig. 8: Electromagnetic wave simulation for blocking port versus input port

Fig. 9: Transmission characteristic data for blocking port to input port

<Detailed explanation on main part of drawing>

1: upper conductor plate, 2: lower conductor plate, 3: dielectric substrate, 4: ferrite disk for resonator, 5, 6, 7: microstrip lines (input port, output port and blocking port), 8: Round pad, 9: permanent magnet

The present invention relates to a shuffler using a ferrite disk for a non-radiative microstrip strip line operating in the millimeter wave band.

Recently, a structure in which a microstrip line is disposed on an upper surface of a dielectric substrate between top and bottom conductor plates having a half-wavelength or less of a frequency used as a transmission line in a millimeter wave band has been proposed (Patent Application 10-2005-077635). In particular, the non-radiated microstrip line is known to have little radiation loss through high-order mode generation and leakage wave loss, which has been a problem in the conventional microstrip line, and has been reported for various RF circuit structures.

In the wireless communication transceiver used in the millimeter wave band recently, the circulator passes the transmission and reception signal power through the antenna without loss and mutual interference to have desired characteristics, which is an essential element in manufacturing a wireless communication transceiver. have.

Conventional millimeter wave band circulators use a waveguide type. However, the ferrite resonator must be mounted in the waveguide, which is cumbersome to manufacture, resulting in high manufacturing cost and inability to adjust characteristics.

In addition, the ferrite resonator for NRD guide has to be processed separately precisely using a ferrite magnetic material and Teflon tube, and since it is manufactured by a composite material, there is a problem that it is very difficult to control the resonance characteristics of the ferrite resonator.

The present invention is a structure and method for solving the above problems,

Preferably, the microstrip lines of the input port, the output port, and the blocking port are disposed on the dielectric substrate at intervals of 120 °, and the ferrite resonators are disposed on the upper and lower surfaces of the dielectric substrate based on circular pads in which each port thereof is commonly met. The ferrite disks are attached to each other and ferromagnetic permanent magnets are placed on the upper and lower conductor plates, thereby suggesting a structure that is not affected by external magnetic changes.

Preferably, the structure is configured in accordance with the change in the width and the width of the ferrite disk in order to satisfy the change in the length of the width of the microstrip line, the resonance condition and the broadband performance according to the use frequency.

Preferably, since the structure uses a printed circuit board to connect the circuit with the microstrip line extension line, the fabrication is simple, simple, easy, low manufacturing cost, no coupling loss, and no line loss. Excellent loss due to low loss.

In a circulator for a non-radiating microstrip line using a ferrite disk 4 usable in the millimeter wave band of the present invention, the structure and method are as follows.

Preferably, the dielectric substrate 3 is inserted between the upper and lower conductive plates 1 and 2 having a spacing of less than half the wavelength of the operating frequency, and ferrite disks for ferrite resonators are respectively provided on the upper and lower surfaces of the dielectric substrate 3 ( 4), and the microstrip lines 5, 6, and 7 are arranged at intervals of 120 degrees with respect to the ferrite disk 4, and the microstrip lines 5, 6, and 7 respectively have input ports ( 5), the output port 6 and the blocking port (7) to be divided.

Preferably, the permanent magnet holes are processed in the upper and lower surfaces of the upper and lower conductive plates 1 and 2 positioned above and below the ferrite disk 4, and the permanent magnets 9 are inserted into the holes, which are ferrites. The magnetic force of the ferromagnetic permanent magnet 9 is used to obtain the saturator characteristic regardless of the external magnetic change so that the disk 4 becomes saturated.

Preferably, the dielectric substrate 3 was referred to by introducing a physical parameter of Rogers' RT / Duroid5880 (0.15T, ε = 2.2) material having a dielectric constant ε = 2.2.

Preferably, the ferrite disc 4 for ferrite resonators has a thickness t and a diameter d. The thickness is to be arranged at a height lower than the spacing (λ / 4) of the upper and lower conductive plates (1, 2).

FIG. 1 shows a perspective view of a shuffler structure for a non-radiating microstrip line using the ferrite disk 4.

1, the dielectric substrate 3 is inserted between the upper and lower conductive plates 1 and 2 having a spacing less than half the wavelength of the operating frequency, and the microstrip lines of the input port, the output port and the blocking port ( 5, 6, and 7) are arranged at 120 ° intervals,

Preferably, the microstrip line has a structure in which ferrite disks 4 are respectively seated on the upper and lower surfaces of the dielectric substrate, based on the circular pads 8 of the copper foil where the ports 5, 6, 7 meet in common. have.

Preferably, the upper and lower surfaces of the upper and lower conductor plates 1 and 2 positioned above and below the ferrite disk 4 are provided with holes for permanent magnets, and are inserted into the holes as permanent magnets 9, which are ferrites. The magnetic force of the ferromagnetic permanent magnet 9 is used to obtain the saturator characteristic regardless of the external magnetic change so that the disk 4 becomes saturated.

FIG. 2 shows a plan view of a shroudler structure for a non-radioactive microstrip line using the ferrite disk 4. According to Figure 2, the thickness of the thickness (t) and the diameter (d) is adjusted for the resonance conditions and broadband characteristics of the ferrite disk, and composed of an input port (5), an output port (6) and a blocking port (7) The length of the width of the microstrip line (w) depends on the frequency of use.

Preferably, the ferrite disks 4 for ferrite resonators are arranged on the upper and lower surfaces of the dielectric substrate, and the diameter d of the ferrite disk is adjusted to be used from about 3.0 mm to 3.5 mm. In addition, the thickness t was adjusted and used from 0.1 mm to 1.0 mm.

According to the embodiment, the frequency used was Q band, that is, from 30 GHz to 45 GHz. Preferably, the distance a between the upper and lower conductor plates 1 and 2 of the non-radiative microstrip line is adjusted from 2.0 mm to 3.5 mm to determine the most excellent condition a to 2.5 mm.

Preferably, the width w of the microstrip lines 5, 6, and 7 of the non-radioactive microstrip line was determined to be 0.2 mm.

Preferably, the resonant frequency of the ferrite disk 4 was adjusted to 38 GHz, and the diameter d of the ferrite disk 4 was determined to be 2.5 mm.

Preferably, the thickness t of the ferrite disk 4 is changed from 0.3 mm to 0.5 mm to obtain a result of 0.42 mm, which is the best condition.

3 shows the results of analysis through simulation to determine the insertion loss (S21) and the reverse insertion loss (S31) according to the thickness change of the ferrite disk 4 of the above-described shuffler. According to Fig. 3, the forward insertion loss S21 has good characteristics at 38 GHz within 1 dB. The reverse insertion loss (S31), that is, the blocking property, may cause an insertion loss of less than -25 dB over a band of 1.5 GHz or more, so that radio waves are not transmitted in the reverse direction.

According to the embodiment, in the structure of the non-radiating microstrip line using the ferrite disk 4, a circuit simulation was performed to examine the flow of electromagnetic waves of input / output signals for each port (5, 6, 7).

FIG. 4 shows the electromagnetic wave flow in the remaining ports when a signal input is applied to the input port 5 in the structure of the non-radiative microstrip line using the ferrite disk 4. According to FIG. 4, it can be confirmed that the electromagnetic field mode passes through the input port 5 from the input port 5 to the output port 6 with respect to the electric field input or the magnetic field input signal.

5 shows transmission characteristics with respect to FIG. According to Fig. 5, the insertion loss S21 of the output port 6 to the input port 5 is within about 1 dB, and the reflection loss S11 is represented by -30 dB, which shows good transmission characteristics. The resonance frequency at this time was 37.11 GHz.

FIG. 6 shows the electromagnetic wave flow in the remaining ports when the signal input is applied to the output port 6 in the shroud structure for the non-radiating microstrip line using the ferrite disk 4. According to FIG. 6, it can be seen that the electromagnetic field mode passes through the output port 6 from the output port 6 to the blocking port 7 as it is with respect to the electric field input or the magnetic field input signal.

FIG. 7 shows transmission characteristics of FIG. 6. According to Fig. 7, the insertion loss S32 of the blocking port 7 with respect to the output port 6 is within about 1 dB, and the reflection loss S22 is represented by -30 dB, which shows good transmission characteristics. The resonance frequency at this time was 37.17 GHz.

FIG. 8 shows the electromagnetic wave flow in the remaining ports when the signal input is applied to the blocking port 7 in the shuffler structure for the non-radiating microstrip line using the ferrite disk 4. Referring to FIG. 8, it can be seen that the electromagnetic field mode passes through the blocking port 7 from the blocking port 7 to the input port 5 with respect to the electric field input or the magnetic field input signal.

9 shows transmission characteristics with respect to FIG. According to Fig. 9, the insertion loss S13 of the input port 7 to the blocking port 7 is within about 1 dB, and the reflection loss S33 is represented by -30 dB, which shows good transmission characteristics. The resonance frequency at this time was 37.05 GHz.

The structure overcomes the drawbacks of the conventional waveguide-type shuffler manufacturing and proposes a millimeter wave band having excellent characteristics.

In addition, since the ferrite disk is attached to the upper and lower surfaces of the dielectric substrate on the strip line rather than the conventional waveguide structure, it has the advantage of low loss in the millimeter wave band, easy production, and mass production.

In addition, by inserting a ferromagnetic permanent magnet in the upper and lower holes of the upper and lower conductor plates located above and below the ferrite disk, inducing saturation magnetization of the ferrite disk, there is an advantage not to be affected by external magnetic change.

In addition, since the shuffler is constructed by using the strip line extension line attached to the circuit, there is no coupling loss and the line loss is low, so the characteristics are excellent.

The invention has proved the possibility of integrated circuit construction in the millimeter wave band. In addition, by adopting a duplexer or transceiver circuit among the RF core elements, it can be miniaturized and bidirectional communication is possible.

Claims (3)

In the shroud for a non-radiating microstrip line, The dielectric substrate 3 is inserted between the upper and lower conductor plates having a spacing of less than half the wavelength of the operating frequency, and the microstrip lines of the input port, the output port, and the blocking port are disposed at 120 ° intervals, respectively. Ferrite disks are attached to the upper and lower surfaces of the dielectric substrate, respectively, based on the central disk where the ports of the microstrip line meet in common. The ferrite disks are disposed on the upper and lower surfaces of the dielectric substrate, the diameter of the ferrite disk is adjusted according to the resonance characteristics, and the thickness t is less than λ / 4, A non-radiative microstrip line reciprocator characterized in that the permanent magnet holes are processed on the upper and lower surfaces of the upper and lower conductor plates positioned above and below the ferrite disk, and a ferromagnetic permanent magnet is inserted into the holes. The method of claim 1, The microstrip line disposed on the upper surface of the dielectric substrate has a line width and thickness determined according to the use frequency, and the strip line is produced by a print etching technique at 120 ° intervals based on the circular pad of copper foil. Shuffler for Microstrip Line The method of claim 1, Permanent magnet holes are processed in the upper and lower surfaces of the upper and lower conductor plates positioned above and below the ferrite disk, and a permanent magnet is inserted into the hole, which uses the magnetic force of the ferromagnetic permanent magnet to make the ferrite disk saturated. Shearator for non-radio microstrip line which is characterized by not being affected by external magnetic change

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