KR101788824B1 - Apparatus for microstrip reconfigurable duplexer device controlled by single switch - Google Patents

Abstract

The present invention relates to a single switch control microstrip reconfiguration duplexer, and more particularly, to an antenna for transmitting and receiving a transmission signal and a reception signal into space. A duplexer having at least two band-pass filters; And a switch provided between the antenna and the duplexer for controlling the directions of the transmission signal and the reception signal.

Description

≪ Desc / Clms Page number 1 > APPARATUS FOR MICROSTRIP RECONFIGURABLE DUPLEXER DEVICE CONTROLLED BY SINGLE SWITCH [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single switch control microstrip reconfigurable duplexer, and more particularly, to a duplexer that controls the path and frequency band of electromagnetic waves in a microstrip device using one switch.

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A duplexer (Duplexer) is an element that is connected to an antenna of a terminal and separates a transmission / reception frequency of the terminal.

That is, the duplexer is a filter for separating a transmitting end and a receiving end connected to an antenna in a wireless communication, thereby allowing a transmitter and a receiver having different frequencies to be connected to one antenna.

At present, a semi-conductor FBAR duplexer is generally used, and a BPF (Band Pass Filter) is provided on the transmitting end and the receiving end, respectively.

This BPF not only causes a large loss in the duplexer but also increases the size of the duplexer and shows a problem that the attenuation characteristic of the out band is not good. Therefore, a solution is sought to solve this problem.

In recent years, mobile communication service providers have provided communication services while occupying several mobile frequency bands and moving frequency bands as needed.

In addition, there is an increasing demand for using various communication service bands in one terminal, such as receiving communication services between different carriers while traveling in and out of the country.

However, in general, the path of the electromagnetic wave and the pass frequency band in the microstrip type device are fixed.

Therefore, a switch diode or a variable capacitor can be used to control the path and the band, and such a device is referred to as a reconfigurable device.

At this time, since the form is a duplexer, it is called a reconfigurable duplexer, and a conventional reconfigurable duplexer has a disadvantage that a plurality of diodes or variable capacitors must be used.

Since the diode itself contains a resistance component, the transmission loss becomes large when a plurality of diodes are used.

Also, there is a problem that the risk of failure increases as the number of active elements such as switches increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a single switch control microstrip reconfigurable duplexer which is designed to solve the problems described above, has a small loss occurrence, can be miniaturized in size, and has excellent outband attenuation characteristics.

In the meantime, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a duplexer including an antenna for transmitting and receiving a transmission signal and a reception signal into space, a duplexer including at least two band pass filters, and a duplexer provided between the antenna and the duplexer, And a switch for controlling the direction of the signal.

Preferably, the duplexer includes a microstrip ring, a bandpass filter provided in the microstrip ring, a first port connected to the antenna, a second port connected to the receiver, a third port connected to the transmitter, And short-circuited pins for controlling current flow in response to short-circuit and open-circuit.

Preferably, the microstrip ring is formed of a metal plate in the form of a ring or a frame on a dielectric substrate, and a pair of bandpass filters for passing frequencies of different bands may be integrally provided in the microstrip ring.

Preferably, the dielectric substrate may be made of glass or expanded polystyrene.

INDUSTRIAL APPLICABILITY The present invention has a small loss occurrence, a small size, and an excellent out-band attenuation characteristic.

1 is a conceptual diagram of a single switch control microstrip reconfiguration duplexer apparatus according to an embodiment of the present invention.
FIG. 2 conceptually illustrates a top view of a single switch control microstrip reconstruction duplexer apparatus according to an embodiment of the present invention. FIG.
3 conceptually illustrates a side view of a single switch control microstrip reconstruction duplexer device in accordance with an embodiment of the present invention.
FIG. 4 is a graph showing a simulation result of a current distribution according to a short-circuiting pin short-circuit of the single switch control microstrip reconfigurable duplexer shown in FIGS. 1 to 3. FIG.
FIG. 5 is a graph showing a simulation result of current distribution according to the short-circuiting pin opening of the single switch control microstrip reconfigurable duplexer shown in FIGS. 1 to 3. FIG.
FIG. 6 is a graph showing a measurement result of a reflection coefficient and a transmission coefficient according to a short-circuiting pin short-circuit of the single switch control microstrip reconfigurable duplexer shown in FIGS. 1 to 3. FIG.
FIG. 7 is a graph showing experimental results of reflection coefficient and transmission coefficient according to the shorting pin opening of the single switch control microstrip reconstruction duplexer shown in FIGS. 1 to 3. FIG.

The term used in the present invention is a general term that is widely used at present. However, in some cases, there is a term selected arbitrarily by the applicant. In this case, the term used in the present invention It is necessary to understand the meaning.

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

1 is a conceptual diagram of a single switch control microstrip reconfiguration duplexer apparatus according to an embodiment of the present invention. FIG. 2 is a conceptual diagram of a single switch control microstrip reconfiguration duplexer apparatus according to an embodiment of the present invention. FIG. 3 conceptually shows a side view of a single switch control microstrip reconfiguration duplexer according to an embodiment of the present invention. Referring to FIG.

1 to 3, a single switch control microstrip reconfiguration duplexer according to an embodiment of the present invention includes an antenna 10 for transmitting / receiving a transmission signal and a reception signal to / from a space.

At this time, the antenna 10 can use various types of antennas 10 selected according to the frequency or bandwidth of use, and therefore, the present invention is not limited thereto.

Meanwhile, a single switch control microstrip reconfiguration duplexer apparatus according to an embodiment of the present invention includes a band-pass filter 12 for passing a specific frequency band.

At this time, the band-pass filter 12 is a circuit for passing a signal existing in a specific range of frequency at a receiver and removing a signal out of the range, and the band-pass filter 12 is a circuit for removing noise And passes the frequency bands of one or more signals.

In addition, the frequency of the specific range may use various range frequencies specified according to the selection.

The single switch control microstrip reconfiguration duplexer apparatus includes a duplexer 13 having at least two bandpass filters 12.

Hereinafter, the duplexer 13 will be described in detail.

The duplexer 13 according to an embodiment of the present invention includes a microstrip ring 21, a bandpass filter 12, a first port 22, a second port 23 and a third port 24 .

At this time, the microstrip ring 13 is formed of a metal plate or metal thin film in the form of a ring or a frame on the dielectric substrate 26.

In this case, the dielectric substrate 26 may be a non-conductive dielectric substrate of various materials. In an embodiment of the present invention, a microwave dielectric substrate 26 including glass and expanded polystyrene is used.

On the other hand, a pair of the band-pass filters 12 are integrally formed in the microstrip ring 21.

In this case, the microstrip ring 21 according to the embodiment of the present invention integrates and integrates the two band-pass filters 12 shown in FIG. 1 into one so that compared to the conventional devices using two band-pass filters The area of the device can be reduced.

2 and 3, the microstrip ring 21 according to an embodiment of the present invention includes a first port 22 connected to the antenna 10, a second port 22 connected to the receiving unit 14, A second port 24 connected to the transmission unit 15 and a shorting pin 25 provided on the microstrip ring 21 for controlling the flow of current in response to shorting and opening .

The first port 22 is a port directly connected to the antenna 10 and the second port 23 is connected to the receiver 14 and the third port 24 through a transmitter 15 Respectively.

Meanwhile, when the second port 23 is connected to the transmitter 15, the third port 24 is connected to the receiver 14.

 That is, when either one of the two ports is connected to the transmitting unit 15 or the receiving unit 14, the second port 23 and the third port 24 are connected to the transmitting unit 15 or And is directly connected to the receiving unit 14.

3, the microstrip ring 21 according to an embodiment of the present invention is provided on the microstrip ring 21 and includes a shorting pin (not shown) for controlling current flow in response to a short- 25).

3, the shorting pin 25 passes through the microstrip ring 21 and the dielectric substrate 26 at the same time and is connected to the ground plane 30 under the dielectric substrate 26 .

On the other hand, FIG. 4, which shows simulation results of the current distribution according to the short-circuit (25) pin short-circuit of the single switch control microstrip reconfigurable duplexer device shown in FIGS. 1 to 3, 5, the shorting pin 25 is electrically connected between the microstrip ring 21 and the ground plane 30 in accordance with a separate control signal. Repeat paragraph and opening.

At this time, when the shorting pin 25 is short-circuited, a current flows between the first port 22 and the second port 23 as shown in FIG. 4. When the shorting pin 25 is opened, The current flows between the first port 22 and the third port 24 as shown in FIG. 5, so that the flow of current can be controlled according to the short-circuiting and opening of the short-circuiting pin 25.

The single switch control microstrip reconstruction duplexer according to an embodiment of the present invention includes a switch 11 provided between the antenna 10 and the duplexer 13 for controlling the directions of the transmission signal and the reception signal .

At this time, as described above, the switch 11 is configured to selectively control the directions of the transmission signal and the reception signal, and various kinds of switches may be used.

6, which is a diagram showing measurement results of the reflection coefficient and the transmission coefficient according to the short-circuiting of the shorting pin 25 of the single switch control microstrip reconstruction duplexer shown in FIGS. 1 to 3, 7 showing the experimental result of the reflection coefficient and the transmission coefficient according to the opening of the shorting pin 25 of the first port 22 and the shorting pin 25 as shown in FIG. The reflection coefficient S11 has a low value at 2.1 GHz.

The transmission coefficient S21 between the first port 22 and the second port 23 has a high value at 2.1 GHz while the transmission coefficient S31 between the first port 22 and the third port 24 is high, Has a low value at 2.1 GHz.

In addition, the isolation degree S32 between the second port 23 and the third port 24 has a low value at 2.1 GHz.

Accordingly, when the shorting pin 25 is short-circuited, the signal flow between the first port 22 and the second port 23 at a 2.1 GHz in association with the current distribution of FIG. 4 has a high value. At 2.1 GHz, It can be seen that the signal flow between the second port 22 and the third port 24 has a low value.

Referring to FIG. 7, the reflection coefficient S11 of the first port 22 has a low value at 2.25 GHz due to the opening of the shorting pin 25.

The transmission coefficient S31 between the first port 22 and the third port 24 is high at 2.25 GHz while the transmission coefficient S31 between the first port 22 and the third port 24 is high S21) has a low value at 2.25 GHz.

The degree of isolation S32 between the second port 23 and the third port 24 has a low value at 2.25 GHz.

Accordingly, when the shorting pin 25 is opened, the signal flow between the first port 22 and the third port 24 in relation to the current distribution of FIG. 4 has a high value at 2.25 GHz, and the first port 22 ) And the second port 23 has a low value at 2.25 GHz.

As a result, the single switch control microstrip reconfigurable duplexer according to an embodiment of the present invention has a small loss occurrence, miniaturization in size, and excellent out-band attenuation characteristics through the above-described technical constructions.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications may be made by those skilled in the art.

10: Antenna
11: Switch
12: Bandpass filter
13: Duplexer
14: Receiver
15:
21: Microstrip ring
22: First port
23: Second port
24: Third port
25: Shorting pin
26: dielectric substrate
30: ground plane
41: Current flow during switch short circuit
42: Current flow at switch open

Claims (4)

An antenna for transmitting or receiving a transmission signal and a reception signal into space;
A duplexer having at least two band-pass filters; And
And a switch provided between the antenna and the duplexer for controlling a direction of the transmission signal and a reception signal,
The duplexer:
Microstrip ring;
A bandpass filter provided in the microstrip ring;
A first port connected to the antenna;
A second port connected to the receiving unit;
A third port connected to the transmitting unit; And
And a shorting pin provided on the microstrip ring for controlling a current flow in response to a short circuit and an open circuit.
The method according to claim 1,
Wherein the microstrip ring comprises a ring-shaped or frame-shaped metal plate on a dielectric substrate, and a pair of band-pass filters for passing frequencies of different bands are integrally provided in the microstrip ring. Microstrip Reconstruction Duplexer Apparatus.
3. The method of claim 2,
Wherein the dielectric substrate is made of glass or foamed polystyrene.
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