TW200845599A - Antenna device and portable radio communication device comprising such antenna device - Google Patents

Abstract

An antenna device for a portable radio communication device comprises a radiating element (10), a filter stage (20) connected to the radiating element, and an amplifier stage (30) connected to the filter stage and connectable to a receiver device for radio signals (40). By providing an amplifier stage that is not unconditionally stable, an antenna device having advantageous characteristics is achieved.

Description

200845599 IX. INSTRUCTIONS OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates generally to an antenna device for use in a helmet-like line such as a mobile phone, and is suitable for use in an antenna device having a phase change. ,and

Radio signals within the band. Catch, as in FM [Prior Art] The internal antenna is used in the portable helmet line a ^ , ... the line communication device has passed a period of day. Using internal antennas for wiring, A has several advantages, and this φ (b) is read as compact and light, so _ in size * weight; important applications such as mobile phones. - ', However, the application of the internal antenna in the line, 仃勖 仃勖 will cause a number of restrictions on the group of antenna components. In particular, in the mold, J-type radio communication device, _ is used for an internal antenna arrangement, and the horse is limited. These restrictions can make it difficult to find the J-hole green group that provides a wide operating band. This is particularly significant when you want to apply this day to the benefits of relatively low frequency | ^ '' ..., , , fruit ^ ^旎, because 'compared to the antenna that operates A at a relatively high frequency, The desired length of the antenna is relatively large. Μ A special bamboo raft application that operates in a relatively low frequency band is FM radio. The FM band is defined in Europe between the frequency of my y, 8 8-108 MHz, or between 7 "10 MHz in the United States. It is incorporated into the casing of a portable electrical communication device. The prior art of conventional antenna configurations, such as loop antennas or monopole antennas, would result in unsatisfactory operational results because the antenna was not present—sufficiently wide-band performance, or 5 200845599 is only A sufficiently narrow frequency band is sufficient. Alternatively, a conventional FM antenna for a portable radio communication device can be provided within the earphone cord connected to the communication device. This configuration has a rather lengthy wiring. It is possible to provide an antenna length that is also sufficient for low frequency applications. However, if an external antenna is not allowed, this solution is obviously not applicable.

In so-called active antenna devices, certain types of semiconductors, such as transistors, are used in an amplifier step to amplify the received or transmitted signals as appropriate. However, to ensure that it is released at all frequencies, the amplifier is placed on the antenna side in an impedance manner. However, this placement introduces unwanted thermal noise, thereby degrading the amplifier's noise factor. Another problem is that if a second antenna, such as a GSM antenna, is provided in the same communication device, and as the FM antenna, the second antenna interferes with the operation of the FM antenna. SUMMARY OF THE INVENTION One aspect of the present invention is to provide an antenna apparatus for a portable radio communication device that operates to have sufficient performance over a relatively low frequency band such as an FM radio band. The present invention is based on the realization of a fixed amplifier stage that can be used in conjunction with antenna antenna features that lack the advantageous features. This will be combined with a filter. Non-unconditionally stable or potentially unstable while considering the impedance resistance load to provide a carefully selected amplifier stage, and the portable radio communication device according to the present invention provides a The antenna device of 200845599, which is adapted to receive a radio signal in at least a first operating band, the antenna device comprising a light-emitting member, which is connected to the radiating member; And - amplifier stage 2: is coupled to the chopper stage and is connectable to a receiver device for radio signals. The antenna device is characterized in that the amplifier stage is not: conditionally stable or potentially unstable. A m-wire electrical connection is also provided that contains this antenna. The antenna device according to the present invention provides a stable operation and at the same time provides a high gain amplification effect, resulting in a relatively powerful low noise FM signal to reach the receiver device of the = radio signal. In a preferred embodiment, the amplifier stage is devoid of a resistive load on the side of the radiating member to enhance the performance of the amplifier stage. In a preferred embodiment, a so-called cascode group _ is employed. With this configuration, high isolation between the input and the turn of the A|| stage can be achieved with high gain, ensuring stable amplification operation. This: Tiny input capacitors provide a broadband solution. In a preferred embodiment, the antenna device is provided with a resistor to improve stability, reduce GSM/CDMA crosstalk, and mitigate Ε = effects without sacrificing FM reception quality. A related preferred embodiment of the scope of the patent application described below will define further preferred embodiments. [Embodiment] A detailed description of a preferred embodiment of the antenna device according to the present invention will be provided hereinafter. In the description below, A uses the term in the patent application." It should be understood that this vocabulary is intended to cover the field and electronic conductor components. The first arrangement of the arrangement of the antenna device 1 according to the present invention is shown in Fig. 1, which is shown in Fig. 1. This includes a fourth member, such as a sheet metal or an elastic film, in the form of a non-resonant segment of an electron conductor material. The size = consumption is 30 by 10 square meters and is placed on the back cover of the portable radio. The radiating member has a feeding station m coupled to a filter stage 20, the stage being arranged to block an & number having a higher than the operating band, the upper rate and being allowed to Signals in the operating band, that is, bandpass filtering and waveband blocking. Preferably, the chopper filter stage is used as a band pass filter and wave filter for signals in the operating frequency band. In the case of & just band operation, the pass band is between 88-1G8 MHz in Europe or 76-11() Mhz in the United States. One of the filter stages 20 functions from the ancient η to / / 功 匕 疋 as an ESD protection circuit, the soap effectively blocks the main f ^ ^ t of the ESD pulse spectrum. The filter can also eliminate or to > reduce interference, the interference number, and possibly other signals placed on the antenna of the magnetic interference (stationary signal, 2° and placed in the same radio communication device) The cell type GSM antenna of the silo county, the frequency of the M antenna, operates the amplification stage 3G after being placed in the waver stage 2G, thereby amplifying the signal received by the xenon radiation member 10. 1 α ^,

The amplified signal is supplied to an FM 200845599 receiver circuit 40, which can be a conventional circuit manufactured by Philips Se., manufactured by W rnuiPs Semiconductor and sold under the name HVQFN40. The pre-connected U circuit contains an RF input 41' which is connected to the amplifier %. The car's best-in-class filter and amplifier stages are relatively close to the light shot 4 10 and are used to minimize the effects and interference from external sources.

Eight «refer to Figure 2 to illustrate - the general implementation shown in Figure i. The first filter stage 2G is implemented here as a grounding circuit, which comprises an inductor 21 and a capacitor 22, which are connected in a flat manner and in a manner between the feed portion U and the ground. In a specific example, the inductance value of the inductive state 2 约为 is about 4 〇 nH, and the capacitance of the capacitor 22 is about 60 pF. The inductor 1 21 and the capacitor 22 together form a bandpass filter for the FM band. A bandpass filter 25 is provided in the form of a series of inductors connected to the RF signal path after the bandpass filter. The preferred inductance value of one of the inductors is in the range of 5 〇 2 〇〇 mH, and particularly preferably in the order of 1000 kHz. The amplifier stage 30 includes a field effect transistor (FET) 3j, the gate of which is coupled to the filter 20, the source of which is directly coupled to the ground, and the drain is coupled to the FM receiver circuit 40. Input 41. A load resistor 32 is also provided, which is connected between the drain of the transistor 3A and the feed voltage Vdd. It should be noted that there is no load resistor conventionally found in the amplifier stage to improve device stability, such as a gate connected to the 9 200845599 gate and a gate and gate connected to the FET. The bias between the poles or the feed resistance is the resistor between them. In part, due to the lack of this resistive load, the amplifier stage itself is not stable at all frequencies. However, by designing the radiating member and the amplifier stage together, it is possible to design a combination, that is, the antenna device, which is stable at all frequencies, but the amplification is not unconditionally stable or potentially stable.

It is presumed that the antenna is operated. The transistor preferably has a minimum noise value of a low force IdB in the operating band and a gain higher than blue. At the same time, it is preferred that the transistor has a lower resistance value Rn' than iq Ob, whereby the highest possible signal reception quality can be obtained for any antenna configuration. By designing the amplifier stage 3〇 and the light projecting member ι, the light-emitting member displays a different common vehicle reaction value at the money level when the transistor displays a negative resistance on its input. Thus, the risk of self-oscillation within the antenna device can be eliminated or minimized. In order to feedback for any relevant frequency, i therefore the negative resistance, the down-conversion Z, should be the parasitic inductance between the source of the /^(4)31 and the ground, which is the I-minimum two. This can be done in several ways. In the figure, the number of the contact pins 2 in the figure is: the FET source and the ground are provided with two or more, and ώ, 丨, 疋 or more, which can reduce the inductance value, and 'Eve self-concussion, that is, the risk of instability. Placed on: On =: The ground plane to which the pole is connected is traditionally on the supply side. Therefore, the way to reduce the parasitic inductance of the printed circuit board (PCB) is to be as thin as possible, 10 200845599 Λ preferably 疋〇5mm or thinner PCB This FET 31 is provided. With a thicker PCB, there is a possibility of providing the ground plane to which the source of the FET 31 is connected on the same side as the transistor element itself. Another way to reduce the J parasitic inductance is to provide a transistor component with as short a foot as possible. Reference will now be made to Fig. 3 to illustrate an alternative implementation of one of the inventive concepts in the form of a second embodiment. Similar to the first specific embodiment described above: this, the spring set 1G1 contains a projecting member UG having a feed local lu connected to the filter (9) 12, and the respective elements correspond to the first. . Specific examples. However, in this second embodiment, the amplification is a so-called common-base common-emitter amplifier 130. The common-base common-emitter amplifier 3 has a -% effect transistor 131 and its gate is connected to the filter 3 12 〇, the direct-pole is directly connected to the ground, and its pole is connected - the source of the second field-effect transistor J pole. The second field effect transistor 133 (four) is connected to the ground through a capacitor I. The drain of the second field effect transistor 133 can be coupled to the input 41 of the TM receiver circuit 40. There is also a "load resistor U2, which is connected between the pole of the second field effect transistor (1) and the feed voltage Vdd. One occurrence: according to Fig. 4 to illustrate a The radiating member 210 of the antenna device in the form of an early-pole antenna is provided with a feeding portion 21丨, which is connected to a bandpass filter to be a signal of 220 names and frequencies in the FM band. Unlike the previous embodiment, the band is not grounded. The bandpass chopper 22 is connected to an amplifier stage 230 of 11 200845599, which can be connected to the rf input of the _FM receiver circuit. 4i. The amplifier stage can be any of the aforementioned amplifier stage % or i3. The feed portion 211 of the light projecting member 21A is also connected to a second filter stage 250. This second filter, wave stage 25 ( ) also ungrounded and arranged to block signals in the FM band, and to allow signals in a second band above the fm band, such as in a cellular application. That is, for example, a GSM signal. The second filter and waver stages can be connected to transmit and receive the second frequency band. The circuit, for example, a GSM circuit 26. Thus, the antenna device 201 can utilize a single-radiation component 21 to operate in two phase-separated frequency ranges 'like the FM band and one or more GSM bands. Referring to FIG. 5, as described above with reference to FIG. 4, a preferred position of the antenna device according to the present invention, wherein the description is a portable hot-wire communication device, such as a Mobile phone, the outline of the casing of the casing. The casing is partially cut away, thereby not obscuring the position of the antenna device, wherein the antenna device can be any device described above with reference to FIG. Printed circuit board (PCB) 31 is placed inside the case, which has a circuit that can be found in a mobile phone (not shown in Figure 2, on the "Hui PCB The FM receiver circuit 4 is disposed. An antenna light structure #32〇 can be disposed at a portion of the casing to receive an IF of a cell-type mobile phone system of a GSM system. Letter 12 200845599 Baochi Seal 330 is also supplied to the back of the case The Dianchi package is connected to the Yanhai FM antenna radiator by a connector (not shown), preferably disposed on the back cover. The light applicator can be packaged;: a thin strip wound around the battery When the back cover is made of metal, it can be directly used as the FM antenna radiator component: the ear can be used as the TM antenna radiator member / brother 6 In the embodiment, a matching network 7:: "Example of a sketch. Here, the specific I turn 70 is placed in the amplifier stage 3 I Hai FM receiving circuit 4〇 This network is: The output amplifier impedance is matched to - (10)hms interface high gain. This matching network 70 is also compared to 9 1 σ.峪70 can also be used to span gains in the frequency band, etc. Figure 7 shows a schematic of yet a further embodiment. This example is similar to the one shown in Figure ,, eight - - according to the wave level 2. And amplifying the crying level 3: there are - the firing member 1 〇, the receiver circuit 40. Lack and ί二二; 7 ..., Dian is also here at the filter level 2 〇 考 介 ::: The light ray structure # i. And somewhere between the chopper level, or even two: somewhere inside the component, provided with -...〇. This resistor can be pressed by IS side. One solution is that the _shot member = value / again has an increased resistance to the RF signal in itself. The attack can be achieved by fabricating a lightweight member of a material that has a relatively high resistance value in the basin itself. And this ', Yu Ruru like A j J horse is beneficial, the reason is two; shot: the piece can be made of a relatively inexpensive material, - things. Alternatively, the resistivity may be as provided by, for example, or more lumped resistors 13 200845599, i.e., as discrete components, and preferably as surface mount components. Preferably, the mouth resistance 80 is a value between the number i' and the value between 5 and 1 GGOhms having a value of 50 hms and a distance less than the loooohms. Since the radiating member and the amplifier stage 30 (as a voltage divider) have an impedance interface, such as i〇〇〇〇h, the performance of the antenna device is not drawn by the _ series is small. Significantly affected.

An example according to the present invention has been described. However, it is well within the scope of the patent application scope of this patent. A number of preferred embodiments of the antenna device will recognize that such changes may be made without departing from the invention, and it will be appreciated that the shape and size of the antenna device according to the present invention can be changed. It belongs to the field defined by the patent scope in the post-loading. Therefore, the precise antenna configuration can be changed to correspond to the shape of the radio communication device, the desired performance, and the like. The foregoing specific embodiment of the antenna device according to the present invention has been described in terms of a radio signal adapted to receive radio signals in the 纟fm band. : And: Other applications are also likely to be used for digital video broadcasting (dvb) signals within the staff's rate. = With reference to its use in mobile phones to describe an antenna device for portable I-line lightning communication, it will be understood that the present invention has a networked radio communication device and device Can be 'sexually mainly for the use of the fixed 本 μ μ 疋 疋 user. The dry case can be a small time like a travel alarm clock, a TV receiver or a game console. Yet another possible application of the antenna device according to the present invention is the personal digital assistant (PDA), the MP3 and CD player, the FM radio receiver, and the laptop. And - further application projects for the car. Because of &, the term "portable radio communication device" should be interpreted in a broad sense. - FET is described as a preferred transistor type. It will be appreciated that other types of transistors, such as heterojunction bipolar transistors (hbt), can also be used. BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described by way of example with reference to the accompanying drawings, in which: FIG. 1 is a schematic diagram showing an antenna device connected to an FM receiver circuit in accordance with the present invention; 2 is a diagram in which a first embodiment of an antenna device according to the present invention is further shown in detail; FIG. 3 is a diagram showing a second embodiment of an antenna device according to the present invention Figure 4 is a diagram showing a third embodiment of an antenna device according to the present invention; Figure 5 is an appearance of an antenna device mounted in a portable radio communication device in accordance with the present invention; a partial cross-sectional view; FIG. 6 is a schematic diagram showing a matching network used between the antenna device and the FM receiver circuit; and FIG. 7 is a schematic view showing the use of the increased height in the antenna device resistance. [Major component symbol description] 15 200845599 I Antenna device 10 Radiation member II Feeding local 20 Filter stage 21 Inductor 22 Capacitor 25 Bandpass filter 3 0 Amplification to level 3 1 Field effect transistor (FET) 32 Load resistor 40 FM Receiver Circuit 41 RF Input 70 Matching Network 80 Resistor 1 0 1 Antenna Device 110 Radiation Member 11 1 Feeding Part 120 Filter Stage 12 1 Inductor 122 Capacitor 125 Bandpass Filter 130 Common Base Common Amplifier 1 3 1 Field Effect transistor 133 second field effect transistor 16 200845599 134 capacitor 201 antenna device 210 single radiating member 2 1 1 feed local 220 band pass filter 230 amplifier stage 250 second filter stage 260 GSM circuit 300 portable radio communication device 3 1 0 printed circuit board 320 antenna radiation member 330 battery package

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Claims (1)

200845599 X. Patent Application: 1 · An antenna device for a portable radio communication device adapted to receive radio signals in at least a first operating band, the antenna device comprising: - a radiating member (10; 110; 210); - a filter stage (20; 120; 220) connected to the radiating member; and - an amplifier stage (30; 130; 230) connected to the filter / A stage, and connectable to a receiver device for a radio signal (40), characterized in that - the amplifier stage is not unconditionally stable. 2. The antenna device of claim 1, wherein the amplifier stage (30; 130; 230) comprises a transistor (31; 131). 3. The antenna device of claim 2, wherein the electrical body (3 1, 13 1) comprises a gate, a source and a drain, and the transistor is in the first operation The frequency band has a minimum noise value below 丨dB and a gain higher than ^15 dB, and wherein - the source of the transistor is directly connected to ground, - the gate of the transistor is connected to the filter Level, the drain of the transistor can be connected to the receiver device (40) for the radio signal, - a resistor is (3 2 ; 1 32) connected to the drain of the transistor and a feed voltage Between (Vdd) and wherein - in operation, the filter stage blocks signals having a frequency higher than the first operating frequency 18 200845599 band and allows signals within the first operating band. 4. The antenna device of claim 2, wherein the electro-crystalline system is a one-effect transistor. The antenna device according to any one of claims 2-4, wherein the transistor (31; 131) has a noise resistance of less than 1 〇 hms. The antenna device according to any one of claims 2 to 5, wherein a plurality of contact pins are arranged between the transistor and the ground. The antenna device according to any one of claims 2-6, wherein the ground plane to which the transistor (31; 131) is connected is printed on a printed circuit board on which the transistor element is mounted On the opposite side of (31〇), and where the printed circuit board (3 1 〇) is 〇·5 mm or thinner. 8. The antenna device according to any one of claims 2-6, wherein the transistor (3 1 ; 13 1) is connected to a printed circuit board (3 1 〇) in the same manner as the δ hai crystal itself On one side. 9. The antenna device of claim 3, comprising a second transistor (133) disposed between the drain of the transistor (131) and the resistor (132), wherein The source of the second transistor is connected to the gate of the transistor. The gate of the second transistor is connected to ground, and the drain of the second transistor is connected to the resistor. 10. The antenna device of claim 9, comprising a capacitor (134) coupled between the gate of the second transistor and ground. The antenna cluster of any of claims 1-10, wherein the radiating member (10) is non-resonant. The antenna device of any one of claims -11, wherein the filter stage (20; 120; 220) is a band pass filter that allows in the first operating band Signal and block signals above and below the first operating band. The antenna device according to any one of the preceding claims, wherein the amplifier stage (30; 13〇) lacks a resistance load on the radiation member side. The antenna device according to any one of claims 1-3, wherein the first operating band is an FM band. 1. The antenna device according to any one of claims 1 to 14, wherein the "A" member member, the _monopole member (21()), and the filter level (coffee) are not Upon grounding, the antenna skirt further includes a second chopper stage (250) that is ungrounded and blocks U' within the first operating frequency during operation and is allowed to be higher than the first operation The U, 4 second filter stage in the second operating frequency T of the frequency band T can be connected to the circuit, which is arranged to transmit and receive the second operating frequency (four) circuit. The antenna device of any of the above-mentioned items, wherein the radiating member is included in a headphone cable. K. The antenna device according to the above-mentioned item of claim 15 An electronic device for a portable radio communication device. The antenna device according to the above-mentioned item, wherein the filter device includes a resistor (8 〇) before the filter stage. The antenna device of claim 18, wherein the 20 200845599 block resistance (80) is provided as the A part of the ejector (2). The antenna device according to claim 18, wherein the resistor (80) is at least one lumped by @ s ^ + 八工仏Resistor. The antenna device according to claim 20, wherein the resistor (80) is in the range of ^ s 丨, 八 八, back to less than 1000 Ohm, and preferably between 5 and 100 Ohms. 22. A portable radio communication device comprising the antenna device according to any one of the items 1 to 1 of the scope of the invention. i•一、闽: as the next page 21