JP4906765B2 - Antenna apparatus and related methodology for multi-band wireless devices - Google Patents

Description

  The present invention relates generally to antenna configurations for mobile stations or other wireless devices that can operate in multiple frequency bands. More particularly, the present invention relates to an antenna apparatus and related method for forming a hybrid strip antenna of a multi-mode mobile station or other wireless device operable, for example, in the 800/900/1800/1900 MHz frequency band.

  The antenna includes a loop strip including a serpentine line and an L-shaped strip as a part, both of which are arranged on the substrate and configured to resonate at a frequency corresponding to a frequency band in which the wireless device can operate. The antenna has a compact size and exhibits stable frequency band characteristics and a radiation pattern.

(Background of the Invention)
For many people, the availability and use of mobile wireless communication systems for communication is a necessary aspect of daily life. Cellular communication systems and cellular-like communication systems are exemplary wireless communication systems whose infrastructure is widely deployed and commonly used. Generations of cellular communication systems are continuously developed and their operating parameters and protocols are published in standards published by standards setting bodies. Then, generations of network devices are deployed successively, each capable of operating according to the relevant operating standard.

  Although early generation cellular communication systems provided voice communication services and limited data communication services, the succeeding generation cellular communication systems further provide data intensive data communication services. Different operating standards not only provide different communication capabilities, but also use different communication technologies and different frequencies of operation. The installation of various types of cellular communication systems sometimes depends on the jurisdiction. That is, in different areas, a network infrastructure that can operate according to different types of operating standards is deployed. Network infrastructure deployed in different areas is not necessarily compatible. A mobile station operable to communicate with a network infrastructure configured according to one operational specification is not necessarily operable to communicate with a network infrastructure operable according to another operational standard.

  So-called multi-mode mobile stations have been developed that provide mobile stations with the ability to communicate in more than one or multiple communication systems. In general, such a multi-mode mobile station automatically selects a method to respond to the network infrastructure detected in the coverage area in which the mobile station is operational and where the mobile station is located. If the mobile station is located in the coverage area of the network infrastructure of more than one type of communication system with which the mobile station can communicate, the selection is made according to a preferred scheme, ie manually. When multi-mode capability is provided, the mobile station includes circuitry and circuit elements that allow its operation to communicate according to each communication system. Most simply, multi-mode mobile stations are formed with separate networks and are individually operable to communicate according to various operating standards. From time to time, to the extent that circuit elements of different circuit paths can be shared, the components of the individual circuit paths are either related to each other or configured to be shared. Sharing circuit elements reduces the network size and the total number of components, resulting in cost and size savings.

  However, sharing antenna transducer elements between different circuit paths presents unique challenges. The required size of the antenna transducer element depends in part on the frequency of the signal energy converted by the transducer element. And as mobile station configurations are increasingly miniaturized and housed in increasingly smaller package size enclosures, antenna transducer designs become increasingly difficult, especially in multi-mode where different modes operate at different frequencies. It becomes difficult in the mode mobile station. Significant efforts have been made to construct small size antenna transducers that can operate in multiple frequency bands and allow their placement within the housing of a compact sized mobile station.

  PIFA (Plate Inverted F Antenna) is sometimes used. PIFAs are generally compact in size, inconspicuous and allow radiation in two bands. However, such an antenna structure generally exhibits a narrow bandwidth. In order to increase the bandwidth of PIFA, the structure of PIFA is sometimes combined with parasitic elements or multilayer, three-dimensional structures. However, such addition increases the volumetric dimensions of the antenna. Furthermore, tuning of the antenna becomes difficult due to further resonant branching. And branching sometimes introduces EMC and EMI that interfere with the conversion of signal energy.

  Thus, there continues to be a need for an improved antenna structure that allows use in small dimensions and in multiple frequency bands.

  In view of this background information regarding antenna transducers for wireless devices, significant improvements of the present invention are underway.

  The present invention further provides the following means.

(Item 1)
A strip antenna (42) for a communication device (12), the strip antenna (42) being applied to a substrate (52), wherein the strip antenna (42)
A first radiating element formed of a closed loop (56) of conductive material, to which the signal (76) from the communication device (12) is supplied and to ground (74 ) And the closed loop (56) has a first radiating element having at least one first resonance frequency in a first frequency band (94);
A second formed by a strip (58) electrically coupled to and located in the region (62) surrounded by the closed loop (56) forming the first radiating element; The second radiating element is configured to have at least one second resonant frequency in a second frequency band (96), the second frequency band being A strip antenna (42) characterized by a second radiating element different from the frequency band of one.

(Item 2)
The strip antenna (42) according to item 1, wherein the closed loop (56) forming the first radiating element extends near the periphery of the substrate (52).

(Item 3)
The substrate (52) includes a first peripheral side, a second peripheral side, a third peripheral side, and a fourth peripheral side, and the closed loop (56) includes the first peripheral side. The strip antenna (42) according to item 2, extending along a peripheral edge of the second, a second peripheral edge, a third peripheral edge, and a fourth peripheral edge, respectively.

(Item 4)
A portion of the closed loop (56) forming the first radiating element further comprises a serpentine line (66), the serpentine line (66) being a first peripheral side of the substrate (52). The strip antenna (42) of item 1, extending along a portion.

(Item 5)
5. The strip antenna (42) according to item 4, wherein the closed loop (56) is a first length that determines the first frequency band.

(Item 6)
6. The strip antenna (42) according to item 5, wherein the meander line is a second length providing a second resonant frequency in the first frequency band (94).

(Item 7)
Item 7. The item 6 wherein the second radiating element (58) is configured to cause the antenna (42) to have a single resonant frequency within the second frequency band (96). Strip antenna (42).

(Item 8)
The strip antenna (42) according to item 7, wherein the second frequency band (96) is a higher frequency than the first frequency band.

(Item 9)
The strip antenna according to item 8, wherein the at least one resonance frequency in the second frequency band (96) is higher than the at least one resonance frequency in the first frequency band (94). (42).

(Item 10)
8. The strip antenna (42) according to item 7, wherein the first frequency band (94) comprises an 800 MHz band.

(Item 11)
Item 8. The strip antenna (42) of item 7, wherein the second frequency band (96) comprises a 1800 MHz band.

(Item 12)
Item 8. The strip antenna (42) of item 7, wherein the first frequency band (94) comprises a 900 MHz band.

(Item 13)
Item 8. The strip antenna (42) of item 7, wherein the second frequency band (96) comprises a 1900 MHz band.

(Item 14)
8. The strip antenna (42) according to item 7, wherein the second frequency band includes a 1800 MHz band.

(Item 15)
A method of forming an antenna (42) for transmitting and receiving signal energy in a wireless device (12), the method comprising:
Forming (104) a first radiating element near the periphery of the substrate (52), the first radiating element being a closed loop (56), wherein the closed loop (56); Defines a closed loop (56) to which a signal (76) from the wireless device (12) is supplied and to which a ground (74) is attached, the closed loop (56) having a first frequency band Resonating at at least one first frequency in (94);
In forming (106) a second radiating element in a region (62) of the substrate (52) within the closed loop (56) formed by forming (104) the first radiating element; The second radiating element defines a strip (58) in the closed loop (56) that resonates at at least one second frequency in a second frequency band (96); The frequency band of 1 is different from the second frequency band; and
Converting (108) signal energy from the first radiating element and the second radiating element in the first frequency band (94) and the second frequency band (96); Method.

(Item 16)
The act (104) of forming the first radiating element further comprises forming a meander line (66) of a portion of the closed loop (56), the closed loop (56) comprising the first loop (56). Item 15 is configured to resonate at a first frequency in one frequency band (94), and the meander line (66) is configured to resonate at a second frequency in the first frequency band. The method described in 1.

(Item 17)
16. The method of item 15, wherein the second frequency band (96) includes a frequency band, and the frequency of the frequency band exceeds the frequency of the first frequency band (94).

(Item 18)
16. The method of item 15, further comprising connecting the antenna (42) to the wireless device.

(Item 19)
A strip antenna (42) for a multiband available mobile station (12) in a housing (44), the strip antenna comprising:
A substrate that can be disposed within the housing (44);
A closed radiating loop, to which a signal from the mobile station is supplied and grounded, the closed loop is applied to the periphery of the substrate, and the radiating loop is A serpentine line along a portion of the periphery of the substrate, the radiating loop resonates at a first frequency within a first frequency band, and the serpentine line has a second frequency different from the first frequency band; A closed radiating loop that resonates at a second frequency in the band;
A radiating L-shaped strip mounted on the substrate and within an interior region defined by the closed radiating loop, wherein the L-shaped strip is a single frequency at least overlapping with the second frequency band. A strip antenna (42) characterized by a radiating L-shaped strip that resonates in a band.

(Summary)
An antenna apparatus and related method for a wireless device capable of using multiple frequency bands, such as a quad-band mobile station. The antenna device forms a hybrid strip antenna having a pair of resonant elements. The first resonant element forms a peripheral loop extending near the periphery of the substrate. The serpentine line extends along a portion of the peripheral loop. The second resonant element is formed of an L-shaped strip. The peripheral loop resonates at a set of frequencies, and the L-shaped strip resonates at a single frequency. Through appropriate selection of the length of the resonant element, the frequency at which the element resonates is controlled.

  Thus, the present invention advantageously provides an antenna apparatus and related methods for a mobile station or other wireless device that can operate in multiple frequency bands.

  Through the operation of embodiments of the present invention, a method is provided for forming a hybrid strip antenna of a multi-mode mobile station or other wireless device operable in, for example, the 800/900/1800/1900 MHz frequency band.

  In one aspect of the invention, the antenna is formed of a first radiating element and a second radiating element including a loop strip and an L-shaped strip. The radiating element is configured to resonate at a frequency corresponding to a frequency band in which the wireless device is operable.

  In one aspect of the present invention, a substrate is provided that is dimensioned to allow accommodation within a housing of a mobile station or other compact device of compact dimensions. The substrate is a rectangular or other geometric configuration that allows the coating or other application of conductive material thereon. The dimensions of the substrate are large enough to allow the formation of conductive loops thereon. The loop strip is of a length that resonates in the frequency band in which the mobile station is formed on the substrate. The loop is formed near the periphery of the substrate, and extends, for example, to the peripheral edge of the substrate. Feed connections and ground connections are further provided in the loop formed near the periphery of the substrate. The length of the loop strip determines the first resonance frequency band. That is, the loop length resonates within the first frequency band. Through appropriate selection of the loop length, the loop resonates in a frequency band corresponding to at least one of the mobile station operating modes.

  In another aspect of the invention, a portion of the loop extending near the periphery of the substrate includes a serpentine line. The meander line is formed, for example, along one of the peripheries of the substrate on which the loop is formed. The meander line has a length that resonates in the second frequency band. The second frequency band in which the meander line resonates is determined by its length. Then, through appropriate selection of the length of the meander line, the portion of the meander line of the loop is resonated in a frequency band corresponding to the operating frequency band of the multi-mode mobile station. The serpentine line is formed in a rectangular swath of conductive material that forms part of a loop formed near the periphery of the substrate, for example, by non-conductive segments, or digit interdigitation. The length of the meander line is increased by increasing the interdigitation of non-conductive segments or digits. An appropriate resonant frequency is created by using a corresponding appropriate amount of interdigitation.

  A loop formed near the periphery of the substrate and including a meander line as part of the loop is thereby defined by a set of resonant frequency bands, i.e., the total length of the loop including the length of the meander line. A resonance frequency band and a second resonance frequency band defined by the length of the meander line are defined.

  In another aspect of the invention, an L-shaped strip is also formed on the substrate. The L-shaped strip is formed in an inner region defined by a loop extending near the periphery of the substrate. The end of the L-shaped strip is electrically coupled to the peripheral loop. The L-shaped strip is connected to the peripheral loop by, for example, the short end of the L-shaped strip. The L-shaped strip resonates in the resonance frequency band. The resonant frequency band in which the L-shaped strip resonates depends on the length of the strip. Through appropriate selection of the strip length, the resonant frequency band at which the strip resonates corresponds to the operating frequency band of the mobile station to which the antenna is coupled.

  In one implementation, the antenna is used in a multiband cellular mobile station that can operate in the 800/900/1800/1900 MHz frequency band. The configuration of the peripheral loop and the L-shaped strip is selected to provide resonance at frequencies including the band in which the mobile station is operable. The length of the peripheral loop defines a lower frequency band, and the length of the meander line and the length of the L-shaped strip resonate in the higher frequency band. The higher frequency band in the meander line and the L-shaped strip resonates in the higher frequency band. The higher frequency bands in the meander line and the L-shaped strip overlap each other or overlap corresponding to the higher operating frequency of the mobile station.

  Due to the compact size, operational stability and stable radiation pattern provided by the antenna, the antenna is advantageously utilized in small volumetric mobile stations or other wireless devices.

  Accordingly, in these and other aspects, a hybrid strip antenna and associated methodology is provided for a communication device. The hybrid strip antenna is incorporated into the substrate. The first radiating element is formed of a loop. The loop is configured such that the first radiating element resonates within a first set of frequency bands. The second radiating element is formed of an L-shaped strip that is coupled to and extends beyond the loop forming the first radiating element. The L-shaped strip is configured such that the second radiating element resonates within the second set of frequency bands.

  Thus, referring first to FIG. 1, a wireless communication system, generally indicated at 10, provides wireless communication with a mobile station, of which a mobile station 12 is represented. Here, the mobile station 12 represents a quad-mode mobile station capable of communicating in a frequency band of 800/900/1800/1900 MHz. Such mobile stations are sometimes referred to as world-band mobile stations because they can operate in compliance with the operating specifications and protocols of current mainstream cellular communication systems. More generally, a mobile station represents a variety of wireless devices that can operate in multiple bands or a wide bandwidth at relatively high frequencies.

  Radio access networks 14, 16, 18, and 22 represent four networks that can operate in the 800, 900, 1800, and 1900 MHz frequency bands, respectively. When the mobile station 12 is located within the coverage area of any of the radio access networks 14-22, the mobile station can communicate with them. If another network has overlapping coverage areas, a selection is made as to which network to communicate with. Here, the radio access networks 14 to 22 are coupled to the core network 28 by a gateway (GWY) 26. A communication endpoint (CE) 32 representing a communication device communicates with the mobile station.

  The mobile station includes a wireless transceiver having transceiver circuitry 36 that is capable of transmitting and receiving communication signals with any of the networks 14-22. The transceiver circuitry includes separate or shared transceiver paths configured to be operable with the respective network operating standards and protocols. The wireless station further includes an antenna 42 of an embodiment of the present invention. The antenna is characterized by being operable in various frequency bands in which the transceiver network and the radio access network can operate. Here, the antenna is operable in the 800, 900, 1800, and 1900 MHz frequency bands. In an exemplary implementation, antenna 42 is housed in a mobile station housing 44 with transceiver circuitry. Since the space in the housing available to accommodate the antenna is limited, the size of the antenna 42 is correspondingly small and at the same time the signal energy conversion by the antenna over a wide frequency at which the mobile station can operate. I will provide a.

  FIG. 2 illustrates an exemplary implementation of an antenna of an embodiment of the present invention. The antenna has a lateral dimension 46 and a longitudinal dimension 48 that allow for placement of the antenna in a housing 44 (shown in FIG. 1). For example, the substrate is 35 mm x 25 mm. The plan view of FIG. 2 illustrates the configuration of conductive traces formed on the substrate 52. The substrate is formed of or includes a non-conductive plate or portion that provides a surface that allows coating with a conductive material.

  The antenna 42 forms a hybrid strip antenna having a set of radiating elements, a peripheral loop 56 and an L-shaped strip 58.

  The peripheral loop extends near the periphery of the substrate and, in the exemplary implementation, extends to the peripheral edge of the substrate. The loop 56 forms an enclosed shape that defines an interior region 62 in which a second resonant element, ie, an L-shaped strip 58 is formed.

  Here, the peripheral loop 56 has a substantially rectangular configuration, and is formed by four side portions corresponding to the four sides of the substrate 52. Accordingly, the length of the peripheral loop is defined by two laterally extending side portions and two longitudinally extending side portions. The length of the peripheral loop determines the first resonance frequency at which the antenna resonates. Through appropriate selection of the length of the peripheral loop, the first resonant frequency is thereby formed. Here, the first resonance frequency is a frequency at which the peripheral loop resonates in a lower frequency band where the mobile station can operate.

  One of the side portions, herein the upper side portion (as shown) forms a serpentine line 66. Meander line 66 defines the length of the serpentine line, which is governed by the number and size of non-conductive interdigitated fingers 68. Here, each of the interdigitated fingers 68 extends in a generally parallel direction, and the number makes the meander line 68 the desired length. The meander line also resonates at a resonant frequency, here a frequency corresponding to a higher frequency band in which the mobile station can operate. In one implementation, the side portions where serpentine lines are formed are formed first, and then interdigitated fingers etch away the conductive material of the side portions. In another implementation, the serpentine line forms a portion of a pre-formed pattern that defines where a coating of conductive material that forms the antenna is applied to the substrate 52. The folding of the meander line and the folding of the peripheral loop are performed by changing the length of one or more fingers 68.

  An L-shaped strip 58 is formed in the inner region defined by the peripheral loop 56. One end side of the legs of the L-shaped strip extends to and is electrically coupled to the peripheral loop. Here, the end of the shorter leg of the L-shaped strip extends to the outer peripheral loop 56 between the ground location 74 and the feed location 76. The ground position and feed position define a contact link where the hybrid strip antenna 42 is coupled to the transceiver network 36 (as shown in FIG. 1). The L-shaped strip 58 forms a resonant element that resonates at the resonant frequency. The resonant frequency at which the strip 58 resonates is determined by its length. Through appropriate selection of the strip length, the resonant frequency at which element 58 is resonated corresponds to the frequency at which the mobile station can operate. In an exemplary implementation, the L-shaped strip resonates at a frequency similar to (ie, near, overlaps or near) the frequency at which the meander line 66 resonates.

  The antenna exhibits a stable radiation pattern and a stable frequency band characteristic at all resonance frequencies, here 800/900/1800/1900 MHz bands.

  FIG. 3 illustrates a graphical representation 86 of the antenna characteristics of an exemplary antenna 42 of an embodiment of the present invention. In the display, the frequency is drawn along the abscissa axis 88 and the ordinate axis 92 and is measured in dB. The low frequency passband 94 extends between 824 MHz and 961.111519 MHz. And the passband 96 extends between 1682 MHz and 2038 MHz. The antenna converts signal energy within the frequency band 94 and frequency band 96. The frequency defining the frequency band 94 and the frequency band 96 is changed by changing the length of the loop 56, the length of the meander line 66, and the length of the L-shaped strip 58. Given that the substrate 52 is such that the dimensions of the hybrid strip antenna are small, the hybrid strip antenna can be placed in the housing of a compact sized mobile station and at the same time 800/900/1800/1900 MHz. It also provides operation in multiple frequency bands, such as the four bands of a quad mode mobile station that can operate in multiple frequency bands.

  FIG. 4 illustrates a method flow diagram, indicated generally at 102, and represents a method of operation of an embodiment of the present invention. The method provides for conversion of signal energy in a wireless device.

  First, as shown in block 104, a first radiating element is formed near the periphery of the substrate. The first radiating element defines a loop configured to resonate within a first set of frequency bands. Next, as shown in block 106, a second radiating element is formed in the region of the substrate in the loop that extends near the periphery of the substrate. The second radiating element defines an L-shaped strip and is configured to resonate within a second set of frequencies.

  Then, as indicated by block 108, the signal energy is transformed within a range of the first set of frequency bands and the second set of frequency bands, and the first set of frequency bands and the second set of frequency bands. In the two sets of frequency bands, the first radiating element and the second radiating element resonate.

  Provided is a compact hybrid strip antenna that exhibits a stable radiation pattern and exhibits stable frequency band characteristics. Due to the small size requirements of the hybrid strip antenna, the hybrid strip antenna can be modified for placement in a small sized package, such as in a mobile station housing.

FIG. 1 illustrates a functional block diagram of a wireless communication system in which embodiments of the present invention can operate. FIG. 2 illustrates a representation of the configuration of a hybrid strip antenna according to an embodiment of the present invention. FIG. 3 illustrates a graphical representation of antenna characteristics exhibited by the hybrid strip antenna shown in FIG. FIG. 4 illustrates a method flow diagram representing a method of operation of an embodiment of the present invention.

Explanation of symbols

12 Communication Device 42 Strip Antenna 52 Substrate 56 Closed Loop 58 L-Shaped Strip 62 Region Surrounded by Closed Loop 66 Meander Line 74 Ground Position 76 Feed Position 94 First Frequency Band 96 Second Frequency Band

Claims (15)

A strip antenna (42) for a communication device (12), the strip antenna (42) being applied to a substrate (52), wherein the strip antenna (42)
A first radiating element formed of a closed loop (56) of conductive material, to which the signal (76) from the communication device (12) is supplied and grounded ( 74) and the closed loop (56) has a first radiating element having at least one first resonance frequency in a first frequency band (94);
A second formed by a strip (58) electrically coupled to and located in the region (62) surrounded by the closed loop (56) forming the first radiating element; The second radiating element is configured to have at least one second resonant frequency in a second frequency band (96), the second frequency band being A second radiating element different from one frequency band, the closed loop (56) forming the first radiating element extending around the periphery of the substrate (52);
The substrate (52) comprises a first peripheral side, a second peripheral side, a third peripheral side, and a fourth peripheral side, and the closed loop (56) includes the first peripheral side Extending along each of the peripheral edge of the second, the second peripheral edge, the third peripheral edge, and the fourth peripheral edge,
The portion of the closed loop (56) that forms the first radiating element further comprises a meander line (66) that resonates in the second frequency band, the meander line (66) comprising the substrate (52). ) Extending along a portion of the first peripheral side of the strip antenna (42).   The strip antenna (42) of claim 1, wherein the closed loop (56) has a first length that determines the first frequency band.   The strip antenna (42) of claim 2, wherein the meander line has a second length that provides a second resonant frequency in the second frequency band (96).   The second radiating element (58) is configured to cause the antenna (42) to have a single resonant frequency within the second frequency band (96). Strip antenna (42).   The strip antenna (42) of claim 4, wherein the second frequency band (96) is a higher frequency than the first frequency band.   The strip according to claim 5, wherein the at least one resonance frequency in the second frequency band (96) is higher than the at least one resonance frequency in the first frequency band (94). Antenna (42).   The strip antenna (42) of claim 4, wherein the first frequency band (94) comprises an 800 MHz band.   The strip antenna (42) of claim 4, wherein the second frequency band (96) comprises a 1800 MHz band.   The strip antenna (42) of claim 4, wherein the first frequency band (94) comprises a 900 MHz band.   The strip antenna (42) of claim 4, wherein the second frequency band (96) comprises a 1900 MHz band.   The strip antenna (42) of claim 4, wherein the second frequency band comprises a 1800 MHz band. A method of forming an antenna (42) for transmitting and receiving signal energy in a wireless device (12), the method comprising:
Forming (104) a first radiating element in the vicinity of the periphery of the substrate (52), the first radiating element being a closed loop (56), wherein the closed loop (56); Defines a closed loop (56) to which a signal (76) from the wireless device (12) is supplied and to which a ground (74) is attached, the closed loop (56) having a first frequency band Resonating at at least one first frequency in (94), the closed loop (56) extends near the periphery of the substrate (52), the substrate (52) having a first peripheral edge; A second peripheral side, a third peripheral side, and a fourth peripheral side, wherein the closed loop (56) includes the first peripheral side, the second peripheral side, Extending along each of the third peripheral side and the fourth peripheral side;
In forming (106) a second radiating element in a region (62) of the substrate (52) within the closed loop (56) formed by forming (104) the first radiating element; The second radiating element defines a strip (58) in the closed loop (56) that resonates at at least one second frequency in a second frequency band (96); The frequency band of 1 is different from the second frequency band; and
Converting (108) signal energy from the first radiating element and the second radiating element in the first frequency band (94) and the second frequency band (96), respectively;
Operation of forming a radiating element of said first (104) further includes forming a portion of the meander line The closed loop (56) to (66), meandering line (66), said second A method configured to resonate within a frequency band of.   The method of claim 12, wherein the second frequency band (96) comprises a frequency band, and the frequency of the frequency band exceeds the frequency of the first frequency band (94).   The method of claim 12, further comprising connecting the antenna (42) to the wireless device. A strip antenna (42) for a multiband available mobile station (12) in a housing (44), the strip antenna comprising:
A substrate that can be disposed within the housing (44);
A closed radiating loop, to which the signal from the mobile station is supplied and grounded, the closed loop is applied around the substrate, the radiating loop being A meander line is included along a portion of the periphery of the substrate, the radiating loop resonates at a first frequency within a first frequency band, and the serpentine line is a second different from the first frequency band. The substrate (52) comprises a first peripheral side, a second peripheral side, a third peripheral side, and a fourth peripheral side; The closed loop (56) is closed, extending along each of the first peripheral side, the second peripheral side, the third peripheral side, and the fourth peripheral side A radiation loop;
A radiating L-shaped strip mounted on the substrate and in an interior region defined by the closed radiating loop, wherein the L-shaped strip is in a single frequency band within the second frequency band; A strip antenna (42) characterized by a resonating, radiating L-shaped strip.

Images