JP2008226588A - Coaxial connector with switch, and wireless terminal equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coaxial connector facilitating changeover of a plurality of terminals of a receptacle electrically connected to a contact pin of a plug in fitting the plug to the receptacle. <P>SOLUTION: When the plug is fitted to the receptacle such that the contact pin of the plug comes into contact with a contact spring of the receptacle, and a resin projection of the plug pushes down one end of a first switch spring of the receptacle, the first switch spring comes into non-contact with a center conductor, and the contact pin is electrically connected to a second terminal through a second switch spring. When the plug is fitted to the receptacle such that the contact pin of the plug comes into contact with the contact spring of the receptacle, and the resin projection pushes down one end of the second switch spring, the second switch spring comes into non-contact with the center conductor, and the contact pin is electrically connected to the first terminal through the first switch spring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coaxial connector capable of switching a plurality of input / output terminals and a radio terminal including the same.

  In a conventional mobile phone that has an antenna unit and a radio unit and performs transmission and reception with a base station, in order to suppress variation in radio performance of the radio unit, the radio unit is measured for each unit in a shipping inspection, etc. The result is reflected in the hardware parameters of the control unit. In this measurement, the receptacle of the coaxial connector with a switch described in Patent Document 1 is mounted on the signal line connecting the antenna unit and the radio unit, and the antenna unit and the radio unit are separated by inserting a plug into the plug. It was done by connecting the radio part and the measuring instrument via.

  On the other hand, since the antenna section needs to have a wide band to support multi-frequency cellular phones and complex systems, and it is necessary to cope with thinning and miniaturization of cellular phones, the variable reactance element can be used as a narrow band antenna element. High accuracy and pseudo-broadbanding are achieved by combining matching circuits using. Thus, when a variable reactance element is used for the matching circuit, the original frequency band is narrow, and when a resonant circuit is configured, there is a high possibility of variations in the resonant frequency. It would be desirable to perform shipping inspections and adjustments such as impedance.

JP 2006-66281 A

  In the conventional mobile phone, the receptacle of the coaxial connector that can measure the performance of only the radio unit is mounted by inserting a plug, so there is a problem that detailed performance measurement cannot be performed for the antenna unit. .

  The present invention has been made to solve the above-described problems, and includes a coaxial connector with a switch capable of measuring the radio performance of both a radio unit and an antenna unit in a radio terminal, and the same. An object is to provide a wireless terminal capable of measuring the wireless performance of both the wireless unit and the antenna unit.

  A coaxial connector with a switch according to a first invention includes a receptacle and a plug, and the receptacle is a cylindrical receptacle outer conductor, a center conductor provided at a substantially central portion of the receptacle outer conductor and having a contact spring, and a signal. A first switch and a second terminal that perform input / output of the first switch spring, one end elastically contacting the central conductor and the other end connected to the first terminal, and one end elastically acting on the central conductor. A second switch spring connected to the second terminal at the other end, and the plug includes a cylindrical plug outer conductor, a contact pin provided at a substantially central portion inside the plug outer conductor, and the plug A resin protrusion provided between a plug outer conductor and the contact pin is provided, the contact pin contacts the contact spring, and the resin protrusion pushes down one end of the first switch spring. When the plug is engaged with the receptacle, the first switch spring is not in contact with the center conductor, the contact pin is electrically connected to the second terminal via the second switch spring, and the contact When the plug is engaged with the receptacle so that the pin is in contact with the contact spring and the resin protrusion pushes down one end of the second switch spring, the second switch spring is not in contact with the central conductor. The contact pin is electrically connected to the first terminal via the first switch spring.

  According to a second aspect of the present invention, there is provided a radio terminal including an antenna unit, a radio unit that communicates radio signals via the antenna unit, a first terminal connected to the radio unit, and a second terminal connected to the antenna unit. A receptacle that forms a coaxial connector with a switch in a pair with the plug, and the plug is a cylindrical plug outer conductor, a contact pin provided at a substantially central portion inside the plug outer conductor, A resin-made projection provided between the plug outer conductor and the contact pin, the receptacle having a cylindrical receptacle outer conductor, a center conductor having a contact spring provided at a substantially central portion of the receptacle outer conductor; A first switch spring having one end elastically contacting the central conductor and the other end connected to the first terminal; one end elastically contacting the central conductor and the other end connected to the second terminal; 2 switches When the plug is engaged with the receptacle so that the contact pin comes into contact with the contact spring and the resin protrusion pushes down one end of the first switch spring, the first switch spring has a spring. Non-contact with the central conductor, the contact pin is electrically connected to the antenna portion via the second switch spring and a second terminal, the contact pin is in contact with the contact spring, and the resin protrusion When the plug is engaged with the receptacle so as to push down one end of the second switch spring, the second switch spring is not in contact with the center conductor, and the contact pin is connected to the first switch spring and the first terminal. It is configured to be electrically connected to the wireless unit via the.

  According to the first aspect of the present invention, in the coaxial connector that engages the signal with the plug and the receptacle, the contact pin of the plug is in contact with the contact spring of the receptacle, and the resin protrusion of the plug is the first switch spring of the receptacle. When the plug is engaged with the receptacle so as to push down one end, the first switch spring is not in contact with the center conductor, and the contact pin is electrically connected to the second terminal via the second switch spring. The second switch spring when the plug is engaged with the receptacle so that the contact pin of the plug is in contact with the contact spring of the receptacle and the resin protrusion pushes down one end of the second switch spring. Is in non-contact with the central conductor, and the contact pin is electrically connected to the first terminal via the first switch spring. Since to be, the switching of the first terminal / second terminal of the receptacle to be electrically connected to the contact pins of the plug, it is possible to easily perform.

  According to the second invention, in the wireless terminal that includes the receptacle that is paired with the plug to form a coaxial connector with a switch and electrically connects one of the antenna unit and the wireless unit to the contact pin of the plug, the contact pin of the plug Is in contact with the contact spring of the receptacle, and the plug is engaged with the receptacle so that the resin protrusion of the plug pushes down one end of the first switch spring of the receptacle. The contact pin of the plug is electrically connected to the antenna portion via the second switch spring and the second terminal, the contact pin of the plug is in contact with the contact spring of the receptacle, and the resin of the plug When the plug is engaged with the receptacle so that the protrusion pushes down one end of the second switch spring of the receptacle, Since the second switch spring is not in contact with the central conductor, and the contact pin is electrically connected to the radio unit via the first switch spring and the first terminal, it is electrically connected to the contact pin of the plug. Switching between the wireless unit / antenna unit of the wireless terminal can be easily performed.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram of a mobile phone (wireless terminal) including a coaxial connector with a switch according to Embodiment 1 of the present invention. The cellular phone 10 mainly includes an antenna unit 11, a radio unit 16 including a transmission / reception IC 17, a control unit 18, an operation unit 19, and a display unit 20. The antenna unit 11 includes an antenna element 12, a power feeding unit 13, and a matching circuit 14. The matching circuit 14 includes a resonance circuit using a variable reactance element such as a PIN diode or a varicap diode, and supports multiple frequencies. The resonance frequency can be adjusted and switched. The control line of each variable reactance element is connected to the control unit 18, and the reactance value is changed based on a signal from the control unit 18. The mobile phone 10 communicates an RF signal processed by the radio unit 16 with the base station via the antenna unit 11 based on the control of the control unit 18. A receptacle 21 of a coaxial connector with a switch according to Embodiment 1 of the present invention is mounted between the antenna unit 11 and the radio unit 16 so as to connect the signal lines that follow the antenna unit side and the radio unit side, respectively. Yes.

  An overview of the receptacle 21 is shown in FIG. 2, and a schematic cross-sectional view is shown in FIG. In the figure, a receptacle 21 is disposed on a substrate 27 and mounted so as to connect signal lines connected to the radio unit 16 or the antenna unit 11, respectively, and a central conductor 26 provided in the center, and the central conductor 26 are integrated. Contact spring 29, switch spring 24 having an input / output terminal connected to the radio section side signal line, switch spring 25 having an input / output terminal connected to the antenna section side signal line, and a cylindrical outer conductor surrounding these 30. In addition, a resin 28 having excellent high frequency characteristics and durability is provided inside the outer conductor 30, and the switch springs 24, 25 and the contact spring 29 are elastically supported and made of a resin for a plug 31 described later. Cylindrical holes 22 and 23 for guiding the insertion of the protrusion 33 are formed.

  4 and 6 are schematic views of the plug 31 of the coaxial connector with switch according to Embodiment 1 of the present invention, and FIGS. 5 and 7 are schematic sectional views of the plug 31 fitted into the receptacle 21. FIG. Show. The plug 31 is a cylindrical outer conductor 32 that is in contact with the outer conductor 30 of the receptacle 21, a contact pin 34 that is provided substantially at the center of the plug 31, an inner side of the outer conductor 32, and the durability and high frequency that hold the contact pin 34. A resin 37 having excellent characteristics and a resin protrusion 33 which is a part of the resin 37 are used. A coaxial cable 35 including a core wire 36 connected to the contact pin 34 and an outer conductor connected to the outer conductor 32 is connected to the plug 31.

  Hereinafter, the operation of switching the connection destination of the plug 31 to the antenna unit 11 or the radio unit 16 by fitting the receptacle 21 of the coaxial connector with switch and the plug 31 of the first embodiment will be described with reference to the drawings. First, when the wireless unit 16 is measured, when the plug 31 is inserted into the receptacle 21 in the direction indicated by the arrow in FIG. 4, the contact pin 34 provided in the plug 31 contacts the contact spring 29 in the receptacle 21. At the same time, the resin protrusion 33 in the plug 31 is inserted into the hole 22 provided in the receptacle 21, and the switch spring 25 and the central conductor 26 are separated by pushing down the switch spring 25 in the direction of the arrow. As shown in FIG. 5, after the plug 31 and the receptacle 21 are fitted, the coaxial cable 35 connected to the plug 31 is connected to the radio unit 16 via the contact pin 34 and the switch spring 24, and the other end of the coaxial cable 35 not shown. Is connected to a measuring instrument such as a base station simulator, a signal generator, or a power meter, so that the radio unit 16 can be measured.

  Next, when the antenna unit 11 is measured, when the plug 31 is inserted into the receptacle 21 in the direction indicated by the arrow in FIG. 6, the contact pin 34 provided in the plug 31 and the contact spring 29 in the receptacle 21 come into contact with each other. At the same time, the resin protrusion 33 in the plug 31 is inserted into the hole 23 provided in the receptacle 21, and the switch spring 24 and the central conductor 26 are separated by pushing down the switch spring 24 in the direction of the arrow. As shown in FIG. 7, after the plug 31 and the receptacle 21 are fitted, the coaxial cable 35 connected to the plug 31 is connected to the antenna unit 11 via the contact pin 34 and the switch spring 25, and the other end of the coaxial cable 35 (not shown). By connecting to a measuring instrument such as a network analyzer, the impedance of the antenna unit 11 can be measured.

  As described above, by using the coaxial connector with a switch according to the first embodiment, mounting one receptacle 21 between the radio unit 16 and the antenna unit 11 increases the receptacle mounting area inside the mobile phone. In addition, the performance of both the radio unit 16 and the antenna unit 11 can be measured.

  As shown in FIG. 8, the coaxial cable 35 of the plug 41 used for the measurement is provided in the direction in which the resin protrusion 40 is provided (the direction substantially parallel to the direction in which the input / output terminal of the switch spring 24 extends during fitting). ) So that the coaxial cable 35 does not exist in the vicinity of the antenna unit 11 when the antenna unit 11 is measured. As a result, the resonance frequency of the antenna unit 11 does not change due to the influence of the metal and dielectric contained in the coaxial cable, and the performance of the antenna unit 11 can be measured more accurately.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to the drawings. Since the configuration of the cellular phone on which the receptacle 51 of the coaxial connector with switch according to the second embodiment of the present invention is mounted is the same as that of the first embodiment except for the receptacle 51, the description thereof is omitted.

  FIG. 9 shows an overview of the receptacle 51 and the wireless unit measurement plug 61 fitted thereto, and FIG. 10 shows an overview of the receptacle 51 and the antenna measurement plug 71 fitted thereto. In the figure, a receptacle 51 is arranged on a substrate 27 and mounted so as to connect signal lines connected to the radio unit 16 or the antenna unit 11, respectively, and a central conductor 26 provided at the center, and the central conductor 26 are integrated. Contact spring 29, switch spring 24 connected to the radio signal line, switch spring 25 connected to the antenna signal line, and a cylindrical outer conductor 30 surrounding them. A resin 28 having excellent high frequency characteristics and durability is provided on the inner side of the outer conductor 30, and the switch springs 24, 25 and the contact spring 29 are elastically supported and made of a resin of a plug 61 described later. Cylindrical holes 22 and 23 for guiding the insertion of the protrusion 33, a hole (resin fitting receiving part) 52, and a hole (resin fitting receiving part) 53 are configured. The shape of the cross section perpendicular to the insertion direction (arrow direction) of the hole 52 is the same as the cross section of a resin projection (resin fitting portion) 60 of the plug 61 described later, and the shape of the cross section of the hole 53 is the same as that of the hole 52. Are different and have the same shape as the cross section of a resin protrusion (resin fitting portion) 70 of the plug 71 described later.

  On the other hand, in FIG. 9, the antenna portion measurement plug 61 is provided on the inner side of the cylindrical outer conductor 32 that contacts the outer conductor 30 of the receptacle 51, the contact pin 34 provided at the center, and the outer conductor 32. The resin 37 is excellent in durability and high-frequency characteristics for holding 34, and resin protrusions 33 and 60 that are part of the resin 37. The shape of the cross section perpendicular to the insertion direction of the resin protrusion 60 is the same as the cross section of the hole 52 of the receptacle 51 to prevent erroneous plug insertion. In FIG. 10, the wireless unit measurement plug 71 is provided on the inner side of the cylindrical outer conductor 32 that contacts the outer conductor 30 of the receptacle 51, the contact pin 34 provided at the center, and the outer conductor 32. The resin 37 is excellent in durability and high-frequency characteristics for holding 34, and resin protrusions 33 and 70 that are part of the resin 37. The shape of the cross section perpendicular to the insertion direction of the resin projection 70 is the same as the cross section of the hole 53 of the receptacle 51 to prevent erroneous plug insertion.

  As described above, by using the coaxial connector with a switch according to the second embodiment, the receptacle mounting area inside the cellular phone can be increased by mounting one receptacle 51 between the radio unit 16 and the antenna unit 11. In addition, the performance of both the radio unit 16 and the antenna unit 11 can be measured.

  Further, as plugs to be fitted into the receptacle 51, an antenna part measuring plug 61 having a resin protrusion 60 for preventing erroneous insertion and a wireless part measuring plug 71 having a resin protrusion 70 for preventing erroneous insertion are used. The cross-sectional shape of the resin protrusion 60 is matched with the cross-sectional shape of the hole 52 of the receptacle 51, and the cross-sectional shape of the resin protrusion 70 is matched with the cross-sectional shape of the hole 53 of the receptacle 51, thus preventing erroneous insertion of each plug. Is possible.

Embodiment 3 FIG.
Hereinafter, as a third embodiment of the present invention, a method for inspecting a cellular phone provided with a coaxial connector with a switch according to the present invention will be described with reference to the drawings. FIGS. 11 and 12 show a configuration diagram when, for example, a shipping inspection of a radio unit and an antenna unit of a mobile phone according to the present invention is performed. In FIG. 11, the mobile phone 10 includes the antenna unit 11, the radio unit 16 (not shown), and the receptacle 21 between them, as described in FIG. 1. The plug 31 is connected to a measuring instrument 81 such as a base station simulator, a signal generator, or a power meter via a coaxial cable 35.

  When the plug 31 is fitted into the receptacle 21 in the direction described with reference to FIG. 4, the antenna unit 11 is disconnected from the radio unit 16 as shown in FIG. 5, and the radio unit 16 and the measuring instrument 81 are connected. Then, the shipping inspection of the wireless unit 16 is performed, and the wireless performance of the wireless unit 16 is adjusted by reflecting the measurement result on the hardware parameters of the control unit 18. Thereby, the dispersion | variation in the radio | wireless part performance for every mobile phone can be suppressed.

  FIG. 12 shows a configuration diagram in the case of carrying out a shipping inspection of the antenna unit. In the figure, the mobile phone 10 is similar to the one described in FIG. A receptacle 21 is provided between them. The plug 31 is connected via a coaxial cable 35 to a measuring instrument 82 that can measure the impedance of an antenna unit such as a network analyzer.

  When the plug 31 is fitted into the receptacle 21 in the direction described with reference to FIG. 6, the radio unit 16 is disconnected from the antenna unit 11 as shown in FIG. 7, and the antenna unit 11 and the measuring instrument 82 are connected. Then, the impedance of the antenna unit is measured on necessary channels (all channels if necessary), and the measurement results for each channel are reflected in the hardware parameters of the control unit 18. As a result, the value of the variable reactance element of the matching circuit 14 can be adjusted according to the characteristics of each antenna element and the channel used, and variations in the antenna unit performance for each mobile phone can be suppressed.

  As described above, by using the coaxial connector with a switch according to the present invention, the shipping inspection of both the radio unit 16 and the antenna unit 11 can be easily performed without increasing the receptacle mounting area inside the mobile phone. By performing the adjustment based on the measurement result, it is possible to suppress variations in performance of the radio unit and the antenna unit for each mobile phone.

  In a wireless terminal, it can be used for a shipping inspection in which both the antenna unit and the wireless unit are measured.

1 is a block diagram of a mobile phone according to Embodiment 1 of the present invention. 1 is an overview of a receptacle according to Embodiment 1 of the present invention. It is a cross-sectional schematic diagram of the receptacle which concerns on Embodiment 1 of this invention. 1 is a schematic view of a plug according to Embodiment 1 of the present invention. It is a cross-sectional schematic diagram of the coaxial connector with a switch concerning Embodiment 1 of this invention. 1 is a schematic view of a plug according to Embodiment 1 of the present invention. It is a cross-sectional schematic diagram of the coaxial connector with a switch concerning Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a general-view figure of the coaxial connector with a switch concerning Embodiment 1 of this invention. It is a general-view figure of the coaxial connector with a switch concerning Embodiment 2 of this invention. It is a general-view figure of the coaxial connector with a switch concerning Embodiment 2 of this invention. It is a block diagram in the case of performing the measurement which concerns on Embodiment 3 of this invention. It is a block diagram in the case of performing the measurement which concerns on Embodiment 3 of this invention.

Explanation of symbols

10 mobile phone, 11 antenna, 16 radio, 21 receptacle, 22 holes,
23 holes, 24 switch springs, 25 switch springs, 26 center conductor, 28 resin,
29 contact spring, 30 outer conductor, 31 plug, 32 outer conductor, 33 resin protrusion,
34 contact pin, 35 coaxial cable, 36 core wire, 37 resin, 40 resin protrusion,
41 plug, 51 receptacle, 52 holes, 53 holes, 60 resin protrusion,
61 Radio unit measurement plug, 70 Resin protrusion, 71 Antenna unit measurement plug.

Claims (5)

In a coaxial connector with a switch consisting of a receptacle and a plug,
The receptacle is
Cylindrical receptacle outer conductor,
A central conductor provided at a substantially central portion of the receptacle outer conductor and having a contact spring;
A first terminal and a second terminal for inputting and outputting signals;
A first switch spring having one end elastically contacting the central conductor and the other end connected to the first terminal; and one end elastically contacting the central conductor and the other end connected to the second terminal A second switch spring;
The plug is
Cylindrical plug outer conductor,
A contact pin provided at a substantially central portion inside the plug outer conductor, and a resin protrusion provided between the plug outer conductor and the contact pin;
When the plug is engaged with the receptacle so that the contact pin contacts the contact spring and the resin protrusion pushes down one end of the first switch spring, the first switch spring is not in contact with the central conductor. Contact, the contact pin is electrically connected to the second terminal via the second switch spring,
When the plug is engaged with the receptacle so that the contact pin contacts the contact spring and the resin protrusion pushes down one end of the second switch spring, the second switch spring is not in contact with the central conductor. A coaxial connector with a switch, wherein the contact pin is in contact and the contact pin is electrically connected to the first terminal via the first switch spring. The plug includes a coaxial cable having a core wire connected to the contact pin and an outer conductor connected to the plug outer conductor,
When the plug is engaged with the receptacle so that the contact pin is in contact with the contact spring and the resin protrusion pushes down one end of the first switch spring, the coaxial cable is approximately in the insertion / removal direction of the plug. The coaxial connector with a switch according to claim 1, wherein the coaxial connector is pulled out at a right angle and substantially parallel to a direction in which the first terminal extends. Antenna section,
A radio unit that communicates radio signals via the antenna unit, a first terminal connected to the radio unit, and a second terminal connected to the antenna unit, and a coaxial with a switch paired with a plug A receptacle forming a connector;
The plug is
Cylindrical plug outer conductor,
A contact pin provided in a substantially central portion inside the plug outer conductor,
A resin protrusion provided between the plug outer conductor and the contact pin;
The receptacle is
Cylindrical receptacle outer conductor,
A central conductor provided at a substantially central portion of the receptacle outer conductor and having a contact spring;
A first switch spring having one end elastically in contact with the central conductor and the other end connected to the first terminal;
A second switch spring having one end elastically in contact with the central conductor and the other end connected to the second terminal;
When the plug is engaged with the receptacle so that the contact pin contacts the contact spring and the resin protrusion pushes down one end of the first switch spring, the first switch spring is not in contact with the central conductor. The contact pin is electrically connected to the antenna unit via the second switch spring and the second terminal;
When the plug is engaged with the receptacle so that the contact pin contacts the contact spring and the resin protrusion pushes down one end of the second switch spring, the second switch spring is not in contact with the central conductor. The wireless terminal according to claim 1, wherein the contact pin is electrically connected to the wireless unit via the first switch spring and a first terminal. The plug has a coaxial cable for measuring the radio unit or the antenna unit,
When the plug is engaged with the receptacle so that the contact pin is in contact with the contact spring and the resin protrusion pushes down one end of the first switch spring, the coaxial cable is approximately in the insertion / removal direction of the plug. The wireless terminal according to claim 3, wherein the wireless terminal is drawn at a right angle and substantially parallel to a direction in which the first terminal extends. Antenna section,
A radio unit for communicating radio signals via the antenna unit;
A receptacle having a first terminal connected to the radio unit and a second terminal connected to the antenna unit, and forming a coaxial connector with a switch in pairs with the first plug or the second plug;
The first plug is
A coaxial cable for measuring a wireless part for measuring the wireless part;
A cylindrical plug outer conductor connected to the outer conductor of the coaxial cable for measuring the radio unit,
A contact pin provided at a substantially central part inside the outer conductor of the plug and connected to a core wire of the coaxial cable for measurement of the radio unit;
A resin protrusion provided between the plug outer conductor and the contact pin, and a first resin fitting portion having a predetermined cross-sectional shape;
The second plug is
A coaxial cable for antenna part measurement for measuring the antenna part;
A cylindrical plug outer conductor connected to the outer conductor of the antenna unit measurement coaxial cable;
A contact pin connected to a core wire of the coaxial cable for antenna portion measurement provided at a substantially central portion inside the plug outer conductor;
A resin protrusion provided between the plug outer conductor and the contact pin, and a second resin fitting portion having a different cross-sectional shape from the first plug,
The receptacle is
Cylindrical receptacle outer conductor,
A central conductor provided with a contact spring provided at a substantially central portion inside the receptacle outer conductor;
A first switch spring having one end elastically in contact with the central conductor and the other end connected to the first terminal;
A second switch spring having one end elastically in contact with the central conductor and the other end connected to the second terminal;
A first resin fitting receiving portion having a cross-sectional shape to be engaged with the first resin fitting portion, and a second resin fitting receiving portion having a cross-sectional shape to be engaged with the second resin fitting portion,
When the plug is fitted to the receptacle so that the contact pin contacts the contact spring and the first resin fitting portion and the first resin fitting receiving portion are fitted, the first switch spring is caused by the resin protrusion. The first switch spring is brought into non-contact with the central conductor, and the contact pin of the second plug is electrically connected to the antenna unit via the second switch spring and a second terminal,
When the plug is fitted to the receptacle so that the contact pin contacts the contact spring and the second resin fitting portion and the second resin fitting receiving portion are fitted, the second switch spring is caused by the resin protrusion. One end of the first switch is pushed down so that the second switch spring is not in contact with the central conductor, and the contact pin of the first plug is electrically connected to the radio unit via the first switch spring and the first terminal. A wireless terminal characterized by

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