EP1137097A1 - Structure d'antenne - Google Patents

Structure d'antenne Download PDF

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Publication number
EP1137097A1
EP1137097A1 EP00810251A EP00810251A EP1137097A1 EP 1137097 A1 EP1137097 A1 EP 1137097A1 EP 00810251 A EP00810251 A EP 00810251A EP 00810251 A EP00810251 A EP 00810251A EP 1137097 A1 EP1137097 A1 EP 1137097A1
Authority
EP
European Patent Office
Prior art keywords
resonator element
metal surface
short
distance
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00810251A
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German (de)
English (en)
Inventor
Marc Secall
Matthias Liebendörfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ascom Systec AG
Original Assignee
Ascom Systec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ascom Systec AG filed Critical Ascom Systec AG
Priority to EP00810251A priority Critical patent/EP1137097A1/fr
Publication of EP1137097A1 publication Critical patent/EP1137097A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the invention relates to an antenna construction which is particularly suitable for handheld radios with a metal surface and as an essentially L-shaped angled plate trained resonator element, which is at a distance from an edge of the metal surface is held.
  • the cell phones currently available on the market have the GSM standard predominantly an external antenna, which mostly functions as a ⁇ / 4 monopole. It is known, that the space required for the antenna (in particular the length) is reduced can if the antenna is wound into a helix. In combination with an extendable This construction is capable of monopole antenna from a purely electrical point of view to meet the high requirements of the GSM standard in terms of bandwidth and efficiency. To increase comfort, reduce the risk of damage and To improve the design options, antennas were also developed completely can be accommodated in the housing. These are known antenna designs however only suitable for single band applications and cannot be used in different frequency bands be used.
  • the object of the invention is to provide an antenna construction that is small Has space requirements and that with high bandwidths and performance for multiband operation (e.g. in the GSM 900, DCS 1800 and PCS 1900 networks).
  • the antenna is essentially invented by a metal surface serving as a base plate and an L-shaped plate acting as a resonator element is formed.
  • the L-shaped plate is guided at a distance around an edge of the metal surface. I.e. a short one Leg of the plate is at a predetermined, mean first distance A1 a direction "beyond" the edge in the plane of the metal surface and a long one Leg of the plate in a predetermined, average second distance A2 "over" the metal surface held.
  • the first and the second distance can be according to the specifications can be selected for the desired resonance frequencies and bandwidths. You can especially the same size.
  • the said second leg typically runs more or less parallel to the metal surface.
  • a switching device is provided, via which both can be connected.
  • the switching device is, for example Compact switching element that has at least one electrical or electronic component includes.
  • the transition between the long and the short leg can be square or round his.
  • the distance A2 between the resonator element and the metal surface need not be the same at every point.
  • Resonator element and metal surface can e.g. slightly curved or at a small angle to each other. Furthermore, the distance mentioned varies locally. Overall, it moves within a given Range or varies around a certain average.
  • the resonator element can be adapted to the shape of an inside of a device housing. It disturbs not even if electronic components protrude from the metal surface.
  • the distance A2 is chosen to be smaller than the distance A1.
  • the switching element is preferably designed such that it can be divided into different ones Switching states can be switched. For example, as a short circuit, as an interruption, as a capacity or switched as an inductor. Depending on the switching state, a higher or higher a lower resonance frequency of the resonator element.
  • the switching element is advantageously located at the opposite end of the resonator element Edge arranged.
  • a short-circuit element provided between the metal surface and the resonator element is in the essentially in the direction of the plane defined by the extension of the metal surface guided. It is preferably arranged asymmetrically and can e.g. just in an extension of the metal surface. But it can also - especially at the below explained variant with the "box" volume - by a locally perpendicular to the metal surface standing connecting tab be formed.
  • the supply runs essentially parallel to the short-circuit element from the metal surface out to the resonator element.
  • the exact starting point (location) of the supply and in particular, their distance from the short-circuit element can be varied in order to achieve the desired one To achieve adaptation of the antenna according to the invention. Starting point and Distance must be determined in individual cases and can be optimized as required.
  • the metal surface defines a box-shaped one Volume.
  • the resonator element according to the invention is at a distance from one (preferably face) edge of the box-shaped volume. Its mechanical Support may be solely through the asymmetrically arranged short-circuit element respectively. Depending on the type of supply, this may also be used for stabilization contribute.
  • the construction becomes particularly stable when using a dielectric Support body or when attaching the resonator element to a surrounding the antenna Plastic housing.
  • the metal surface can also be formed by the metallization of a printed circuit board. On this circuit board are also the electronic components of the circuit (transmitter, receiver, Control, data processing).
  • the short-circuit element is e.g. by a soldered or clamped tab is formed (which in the through the circuit board defined level). It can also preferably be printed by a flat Metallization can be formed directly on the circuit board.
  • the feed is then e.g. as Microstrip line on the circuit board from the circuit to the resonator element on the PCB guided.
  • the box-shaped volume is preferably enclosed on all sides by the metal surface.
  • a circuit located in the volume is efficiently shielded.
  • the aim is to achieve a volume that is as flat and layered as possible.
  • the volume is not primarily reduced Height is important.
  • the volume is all-round is enclosed. Narrow and end faces can be partially or fully open.
  • any more or less cuboid volume can be understood as a box-shaped volume be (cigarette box shape).
  • the edges can be square or rounded his.
  • the different side surfaces do not have to be parallel to each other. she can e.g. according to the shape specifications of the design-designed outer housing of the radio telephone may be inclined or curved.
  • the surface formed by the metal surface comprises e.g. two oblong rectangular Main surfaces (in - a small mutual distance in relation to the transverse dimension) and at least one short connecting face.
  • the resonator element covers said end face and an adjacent area of one main face (of course, keeping a certain distance).
  • To feed the antenna is e.g. an inner conductor of a coaxial line (or a microstrip line) through the Metal surface led to the edge of the resonator element.
  • the short leg of the The resonator plate can be fed via a tab (angled towards the metal surface).
  • the short-circuit element can be a connecting strip, which is in an extension a narrow side of the box-shaped volume. So the resonance condition is fulfilled, the short-circuit element must be in the area of a corner of the resonator plate be arranged.
  • Supply and short circuit can be in the same or in different (e.g. perpendicular to each other).
  • the resonator element should be at a smaller distance from the main surface than from the short one connecting face. While the first mentioned distance also determines for the overall height of the handheld radio (to be designed as flat as possible for design reasons) can be, the second mentioned distance only goes into the (not particularly critical) Longitudinal dimension.
  • the body can e.g. an L-shaped angled substrate with a selectively applied metal coating (to form the resonator plate, the feed and short circuit).
  • the antenna according to the invention can also be designed such that the resonator element with the short-circuit element and five patches of the box-shaped metal surface consists of a piece of partially metallized plastic.
  • the plastic part needs not being completely metallized.
  • the non-metallized parts can be used for mechanical Contribute strength.
  • the attached circuit board with the electronic components and the printed die shape completes the metal surface to form a closed one Surface of a box and on the other hand connects the resonator element to the Supply voltage on.
  • Another advantageous embodiment variant is that the resonator element on the inside of the plastic housing of the mobile phone or on a flexible Foil or a thin circuit board substrate is applied.
  • the mechanical support then of course does not have to be taken over by the short-circuit element.
  • the resonator element has a circumference corresponding to half a wavelength ⁇ of the resonance vibration. Since the resonance-active length of the resonator element should be approximately ⁇ / 4 (resonance condition), the short-circuit element should therefore be placed in the corner if possible.
  • the box-shaped volume can have a dimension of 0.33x0.15x0.015 ⁇ 3 , for example.
  • the distance between the connecting end face and the angled part of the resonator element can be, for example, 0.03 ⁇ .
  • the distance to the main surface is only about 0.01 ⁇ , for example.
  • an approximation of the lower limit for the resonance frequency f is calculated according to the following formula: (II) f 1 ⁇ 1 (I 1 + I 2 + h 1 + w 1 + w 2 ) ⁇ c 2 ⁇ r ⁇ ⁇ r , w 2 denotes the distance (parallel to the folding direction) of the switching element to the side edge of the resonator element lying in the direction of the short-circuit element.
  • f 0C 1 (I 1 + I 2 + h 1 + ⁇ c ) ⁇ c 4 ⁇ r ⁇ ⁇ r ,
  • ⁇ C. C ⁇ h 2 ⁇ 0 ⁇ ⁇ r ⁇ W 1 , ⁇ 0 here denotes the dielectric constant of the vacuum and w 2 the distance (parallel to the folding direction of the resonator element) of the switching element to the side edge of the resonator element lying in the direction of the short-circuit element.
  • the switching element can be only switch short-circuit and interruption in two different switching states.
  • the antennas described are preferably used for handheld radios, for example Mobile phones, used.
  • the one required to control the antenna construction electrical circuit is in the box-shaped formed by the metal surface Volume housed.
  • the housing is made of a non-conductive material and the resonator element is in the form of a metal coating, a preformed one Sheet metal or a conductive coated film attached to the inside of the housing.
  • the resonator element, the short-circuit element and the metal surface from one piece, in particular made from a partially metallized plastic.
  • Fig. 1 shows a box-shaped metal surface 1 with two parallel to each other at a short distance arranged main surfaces 1.1, 1.2, an upper and a lower short end face 1.3 or 1.4 and two long narrow side surfaces 1.5, 1.6.
  • the shape is comparable with that of an elongated flat cigarette packet.
  • an L-shaped angled resonator element 5 is held.
  • For Support can be a short-circuit element 4 and - depending on the mechanical design - possibly serve a feed.
  • the width w 1 of the resonator element 5 corresponds to that of the main surface 1.2.
  • An angled short side 5.1 has a length h 1 and is somewhat larger than the end face 1.3 (corresponding to the distance h 2 between the resonator element 5 and the main face 1.2).
  • the short side 5.1 mentioned has a distance I 1 from the end face 1.3 and ends approximately in the extension of a geometric plane defined by the main surface 1.1.
  • the long side 5.2 preferably angled by 90 °, has a length 12 and covers the uppermost region of the main surface 1.2.
  • the short-circuit element 4 is e.g. a strip-like extension of the side surface 1.5. It can be as wide as the mentioned side surface 1.5 or narrower.
  • Power is supplied from the shielded volume.
  • a microstrip line 3.1 (or an inner conductor of a coaxial line) from an electrical Energy source 35 led through the end face 1.3 to the short side 5.1.
  • the feed is arranged in the area of the main surface 1.1 or the side surface 1.5 (the Distance to short-circuit element 4 is determined by the required adjustment).
  • the Circuit for driving the antenna is formed within the metal surface 1 flat volume housed. The metal surface 1 thus forms the shield housing the circuit electronics.
  • the supply (microstrip line 3.1) is more or less in the example shown in the geometric plane formed by the main surface 1.1 and closes at Edge or near the edge of the angled short side 5.1 of the resonator element 5 on.
  • the resonator element 5 is connected to the main surface 1.2 via a switching element 34.
  • the switching element 34 is attached to the edge of the long side 5.2 opposite the short side 5.1 at a distance w 2 from the side edge of the resonator element 5.
  • the switching element 34 serves to influence the resonance frequency of the resonator element 5. Depending on the desired frequency, the switching element 34 is in one of at least two possible switching states switched. Depending on the switching state, it will be different Connection between the resonator element 5 and the metal surface 1, which the effective length of the resonator element and thus its resonance frequency changed.
  • the switching element 34.1 consists of a simple diode 36, for example a PIN diode.
  • the anode 36.1 is with the resonator element 5 and the cathode 36.2 connected to the metal surface 1. Is the voltage difference between the Anode and the cathode equal to zero, blocks the diode 36 and the switching element 34.1 acts as an electrical interruption. If, on the other hand, there is a positive electrical one at control input 37.1 Voltage is applied which is greater than the forward voltage of the diode 36, it becomes conductive and the switching element 34.1 accordingly acts as an electrical short circuit.
  • the switching element 34.1 By one or switching off the control voltage, the switching element 34.1 can thus between two switching states “interruption” and "short circuit” can be switched.
  • FIG. 2b shows a further possibility, such as an interruption / short-circuit changeover switch can be realized.
  • a transistor 38 for example an FET, is connected as a switch (There may be further resistors, not shown). By the transistor can apply a corresponding control voltage at control input 37.2 38 to the "high" state, i.e. conductive or in the "low” state, i.e. not conductive be switched.
  • Figure 2c shows a switching element 34.3 with four different switching states.
  • a changeover switch 39 which is controlled via the control input 37.3, can have one of four possible connection variants between the resonator element 5 and the metal surface 1 can be produced.
  • the four connection variants include a connection interruption 40 at switch position 39.1, an inductive connection via a Inductance L at switch position 39.2, a capacitive connection via a capacitance C. at switch position 39.3 and a short circuit 41 at switch position 39.4.
  • the variant shown in FIG. 3 differs from FIG. 1 with regard to the feed and the positioning of the short-circuit element 4.
  • the microstrip conductor 3.1 (or an inner conductor a coaxial line) is connected to a tab 3.2, which essentially is perpendicular to the short side 5.1 and protrudes towards the end face 1.3.
  • the short circuit element 4 is not in the extension of the side surface 1.5, but in the extension of the main area 1.1.
  • the feed (tab 3.2 and microstrip line 3.1) and the short-circuit element 4 are in turn due to the desired adaptation certain distance from each other.
  • Fig. 4 shows a further alternative in which the resonator element is rounded.
  • the Transition between the long side 5.2 and the short side 5.1 is not by a pronounced edge, but by a continuously curved or curved Transition formed.
  • the radius of curvature is in the order of the distances A1 and A2.
  • Trials have shown that round transitions to a wider range being able to lead. Is the bandwidth - by replacing the angular resonator element by a round - too big, it can by reducing the distance A1 or A2 can be reduced again.
  • the thickness (or overall height) of the entire antenna construction can be advantageous through the use of rounded resonator elements be kept small.
  • the short-circuit element 4 is positioned similar to that in FIG. 3.
  • the supply is carried out by a microstrip line 3.1 in an extension of the Side surface 1.5. From Figures 1, 3 and 4 are different variants for the placement of short circuit and supply can be seen. Of course there are others too Arrangements possible according to the required distance between these two Elements.
  • the distance I 1 between the end face 1.3 and the short side 5.1 is, for example, 0.03 ⁇ , that between the long side 5.2 and the main face 1.2 ( h 2 ) about 0.01 ⁇ .
  • the second mentioned distance is therefore a multiple (eg 3 times) smaller than the first.
  • the width of the resonator element 5.1 is essentially the same as the width B of the metal box.
  • the length h 1 of the short side 5.1 is, for example, 0.025 ⁇ , while the length I 2 of the long side 5.2 measures 0.07 ⁇ .
  • the long side is, for example, more than twice as long as the short side 5.1.
  • an antenna construction according to FIG. 1 with an FET switch as switching element 34 for a GSM 900 network and a DCS 1800 network is to be specified.
  • the basic resonance frequency f 0 with the FET switch open must therefore be 900 MHz, and the increased resonance frequency f 1 with the FET switch closed must be 1800 MHz.
  • the basic wavelength ⁇ 0 is thus in the range of 33 cm.
  • the distance between the supply and the short-circuit element 4 can be adjusted the antenna can be varied to the required input impedance. Exemplary in the above dimensioning mentioned it was 0.037 ⁇ .
  • the resonator element 5 is angled in the manner shown in FIG. 1 or is turned round, it succeeds in the overall height in the critical environment of the supply and the short-circuit element 4 in the longitudinal axis of the housing, where more space is available.
  • the larger side 5.2 of the essentially rectangular resonator element can be at a low height above the metal surface on the radiation side (i.e. the main surface 1.2).
  • the box-shaped metal surface 1 acts as a counterweight to the radiation and ensures good radiation even when the antenna element passes through the hand of the cellular phone user is covered.
  • the input impedance of the antenna according to the invention is approximately 50 ⁇ real.
  • the condition that the reflection loss should be less than 10dB was depending on the switching state achieved a bandwidth between 10% and 20% of the switching element used. With good efficiency and compact dimensions, this value is higher than the corresponding one Requirements of different standards.
  • the low detunability is excellent the antenna through the hand or head of the phone user.
  • As an antenna in the medium air, it has an exceptional efficiency of over 90% largely independent of the radiated power (for example up to 2 watts GSM). Nevertheless, the geometric dimensions are small and optimal for integration adapted in a handheld device.
  • the radiation diagram shows a predominantly omnidirectional Characteristic on. The following are some simple and inexpensive ones Antenna designs are described.
  • FIG. 5 shows a dielectric body 6 with two parts standing at right angles to one another 6.1, 6.2.
  • an all-over metal coating 7.1, 7.2 attached, which corresponds to the resonator element 5 in FIG. 1.
  • On the L-shaped side surface is in the area of part 6.2 a metal coating 7.4 as a short-circuit element attached (see. Short-circuit element 4 in Fig. 1).
  • a narrow strip-shaped metal coating 7.5 attached, which is used to make contact with the switching element.
  • the Switching element can also be directly on the part 6.1 of the dielectric body 6 (for example can be realized as a suitable metal coating 7.5).
  • the resonator construction shown in FIG. 5 can be placed on the outside of a suitably dimensioned shielding housing.
  • the dimensions are such that the end result is a structure comparable to FIG. 1 (metal coating 7.3 aligned with a main surface of the shielding housing and metal coating 7.4 aligned with a side surface of the same).
  • the body 6 forms a dielectric medium ( ⁇ r > 1) and can lead to a reduction in the antenna dimensions.
  • the resonator construction shown in FIG. 5 is mechanically stable and can also define the distances between the resonator element and the shielding housing in a defined manner without any special assembly effort.
  • the antenna With the same resonance frequency, the antenna can be made smaller. However, the bandwidth decreases with increasing dielectric constant ⁇ r . Conversely, the bandwidth and the size of the antenna can be adjusted by the appropriate choice of the material properties of the substrate.
  • FIG. 6 shows how the resonator element made of a piece of sheet metal 8, which has three tabs 12, 13.1 and 13.2 for the supply, the short circuit or the switching element contact, can be manufactured.
  • the substantially rectangular sheet 8 has a suitable location a bending line 9 so that the sheet 8 can be bent in an L-shape.
  • the tabs too 12, 13.1, 13.2 have bending lines 10, 11.1, 11.2 for right-angled turning.
  • the Such sheet metal is shaped over the tabs 12, 13.1, 13.2 with the corresponding Contacts soldered to the shield housing. Soldering can e.g. to be dispensed with, if the bent sheet when assembling the mobile device between the Plastic housing and the shield housing arranged therein is clamped. Short-circuit element and supply are then connected to the corresponding contacts on the shield housing pressed.
  • FIG. 7a represents a structurally simple variant without a shield housing
  • the starting point is a printed circuit board 14 with a metallization 15 the back and an assembly with various electronic components 16 on the front.
  • this example does not refer to the most common ones double-sided and multilayer PCB assemblies. It goes without saying it goes without saying that the invention is readily based on such condensed electronic circuits can be applied.
  • On an end edge 19 (which in the selected Representation runs perpendicular to the plane of the drawing) is via a short-circuit tab 18 a resonator plate 17 according to the invention connected.
  • the feed runs in the same level as the short-circuit tab 18 (and is therefore in the representation according to Fig. 4 not visible).
  • the short leg 17.1 thus ends at a certain distance "Beyond" the edge 19.
  • the long second leg 17.2 runs as small as possible Distance above the (dielectric) circuit board 14.
  • the lower end of the long Leg 17.2 is on the switching element 34 with the circuit board, in particular the Ground or the metallization 15 of the circuit board connected.
  • the control of the antenna takes place through the circuit implemented on the circuit board 14.
  • the switching element 34 can of course also be implemented directly on the printed circuit board 14. In this Case is the lower end of the long leg 17.2, for example, directly with one corresponding solder joint on the circuit board 14, the connection to Ground or metallization 15 via a switching element 34 located on the printed circuit board will be produced.
  • the embodiment shown in Fig. 7a can additionally by a shield housing the electronic circuit can be expanded. Then preferably resonator element and shield housing made of a metallized piece of plastic, the electrically conductive parts being formed by the partial metallization. By folding this plastic part with the circuit board in one operation the antenna is mounted, a contact is made and the electronic circuit is shielded.
  • FIG. 7b shows the embodiment from FIG. 7a with a shielding housing 20.
  • the "back" is of course also shield with a lid.
  • the metal surface effective for the antenna is then this second lid (and not the bulk of the circuit board).
  • the said second lid is in Fig. 7b indicated by a dashed line.
  • the switching element also applies here 34 can also be implemented directly on the printed circuit board 14.
  • the bottom of the long Leg 17.2 is, for example, through a (possibly insulated) hole in the shield housing 20 directly with a component designed as a switching element 34 on the Printed circuit board 14 connected, the switching element 34 in turn with the ground, the Metallization 15 or the shield case 20 is connected.
  • the shape of the resonator element is rounded instead of rectangular be or have different small indentations and tabs to protruding components to embrace or envelop. Holes can also be provided in the resonator element be, for example, to make room for larger circuit elements. It is in remaining conceivable without further ado that a larger number of holes is present.
  • the diameter of a hole is usually not larger than that mentioned above Distance A1 or A2. This can create a kind of lattice structure. Further incisions can be made at locations that do not show high current flows.
  • the angle can between the smaller and the larger part of the L-shaped resonator element deviate from 90 ° and are advantageously rounded. For fine tuning extensions formed on the resonator element, the length of which is the resonance frequency influence.
  • the short-circuit element can be the same width, wider or narrower than the side surface. It doesn't even need to be to lie in the plane of the side surface. For example, to the edge of one of the two Main areas are laid.
  • the resonator element is formed by a copper layer on a flexible film (flexible circuit board), then a rounded bend is created.
  • the film is ins Plastic housing inserted and held in the correct shape by this.
  • the contacts can in turn be guaranteed by soldering or pressing.
  • the copper layer can be printed onto the film in a manner known per se using a photochemical process become.
  • the antenna according to the invention is for operation can be used in radio networks of different network frequencies, the required Resonance frequency adjustable by positioning and choosing the switching element is. Furthermore, the antenna has a relatively high bandwidth in comparison low height of a few millimeters. The antenna is not very sensitive on nearby body parts (such as the hand or head of the phone user). It fulfills the requirements of various mobile radio standards and allows full integration in a plastic housing.

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EP00810251A 2000-03-23 2000-03-23 Structure d'antenne Withdrawn EP1137097A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1313165A2 (fr) * 2001-11-15 2003-05-21 Filtronic LK Oy Procédé de fabrication d'une antenne intérieure, et antenne correspondante
EP1403964A1 (fr) * 2002-09-30 2004-03-31 Murata Manufacturing Co., Ltd. Structure d'antenne et appareil de communication utilisant celle-ci
CN114300854A (zh) * 2022-01-21 2022-04-08 维沃移动通信有限公司 折叠波导谐振腔天线和电子设备
US20230103903A1 (en) * 2020-03-19 2023-04-06 Lg Innotek Co., Ltd. Cover-type antenna

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Publication number Priority date Publication date Assignee Title
EP0604338A1 (fr) * 1992-12-23 1994-06-29 France Telecom Antenne large bande à encombrement réduit, et dispositf d'émission/réception correspondant
US5684492A (en) * 1991-01-28 1997-11-04 Mitsubishi Denki Kabushiki Kaisha Antenna device having a band pass filter
EP0818847A2 (fr) * 1996-07-10 1998-01-14 Ascom Tech Ag Structure d'antenne
JPH11136025A (ja) * 1997-08-26 1999-05-21 Murata Mfg Co Ltd 周波数切換型表面実装型アンテナおよびそれを用いたアンテナ装置およびそれを用いた通信機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684492A (en) * 1991-01-28 1997-11-04 Mitsubishi Denki Kabushiki Kaisha Antenna device having a band pass filter
EP0604338A1 (fr) * 1992-12-23 1994-06-29 France Telecom Antenne large bande à encombrement réduit, et dispositf d'émission/réception correspondant
EP0818847A2 (fr) * 1996-07-10 1998-01-14 Ascom Tech Ag Structure d'antenne
JPH11136025A (ja) * 1997-08-26 1999-05-21 Murata Mfg Co Ltd 周波数切換型表面実装型アンテナおよびそれを用いたアンテナ装置およびそれを用いた通信機

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Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 10 31 August 1999 (1999-08-31) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1313165A2 (fr) * 2001-11-15 2003-05-21 Filtronic LK Oy Procédé de fabrication d'une antenne intérieure, et antenne correspondante
EP1313165A3 (fr) * 2001-11-15 2004-02-04 Filtronic LK Oy Procédé de fabrication d'une antenne intérieure, et antenne correspondante
US6950068B2 (en) 2001-11-15 2005-09-27 Filtronic Lk Oy Method of manufacturing an internal antenna, and antenna element
EP1403964A1 (fr) * 2002-09-30 2004-03-31 Murata Manufacturing Co., Ltd. Structure d'antenne et appareil de communication utilisant celle-ci
JP2004128605A (ja) * 2002-09-30 2004-04-22 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信装置
US6850195B2 (en) 2002-09-30 2005-02-01 Murata Manufacturing Co., Ltd. Antenna structure and communication apparatus including the same
CN1328823C (zh) * 2002-09-30 2007-07-25 株式会社村田制作所 天线结构及包括该天线结构的通信设备
US20230103903A1 (en) * 2020-03-19 2023-04-06 Lg Innotek Co., Ltd. Cover-type antenna
CN114300854A (zh) * 2022-01-21 2022-04-08 维沃移动通信有限公司 折叠波导谐振腔天线和电子设备
CN114300854B (zh) * 2022-01-21 2024-06-04 维沃移动通信有限公司 折叠波导谐振腔天线和电子设备

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