GB2427760A - Differentially fed two port antenna with image rejection means - Google Patents
Differentially fed two port antenna with image rejection means Download PDFInfo
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- GB2427760A GB2427760A GB0513054A GB0513054A GB2427760A GB 2427760 A GB2427760 A GB 2427760A GB 0513054 A GB0513054 A GB 0513054A GB 0513054 A GB0513054 A GB 0513054A GB 2427760 A GB2427760 A GB 2427760A
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- 238000010295 mobile communication Methods 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000005530 etching Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 108091064702 1 family Proteins 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
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- 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
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- 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
-
- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/18—Modifications of frequency-changers for eliminating image frequencies
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
An antenna system suitable for mobile communication devices comprises an antenna element 609 with a feeding structure 602 including first and second ports supplied with first and second phase signals respectively and a transceiver circuit 608 with image rejection means. A non-contact feed structure 602 and balanced slot or patch antenna 609 may be used. The transceiver 608 may include a differential amplifier 610 and Weaver type image rejection circuitry. The antenna system may be integrated and include a conductive case 601, 605. The antenna feed structure 602 may be integral with the transceiver chip 608 or the transceiver chip carrier 603. The slot or patch antenna 609 may be formed by etching them into a conductive ground plate.
Description
Antenna - Transceiver system The present invention relates to an antcnna-
transceivcr system suitable for mobile wireless communications systems. More particularly, but not exclusively, the invention relates to a fully integrated compact antenna- transceiver system.
in recent ycars, increasing demand in the wireless communication market has generated the need for compact and fully integrated radio frequency (RF) front end products. This has led to the development of fully integrated antenna chip modules.
However, due to its small radiation aperture, chip antennas usually suffer from poor antenna performance at low radio frequencies. In order to overcome this limitation, the viable alternative is to couple the electromagnetic energy from the transceiver chip to an externally built antenna Two types of antenna integrated circuit (IC) packages have been proposed. In the first instance, the antenna was built on the chip earner and energy was coupled to it through the use of a single feed proximity coupling.
In the second example, it was proposed that the chip carrier itself could also be used as the radiator. Although in both eases, a compact design has been realized, a much bigger transceiver chip will be needed to meet the antenna real estate requirement. This will inadvertently increase the cost of the IC chip.
There are different architectures commonly used, which can broadly categonsed into so-called "homodyne" and "hetcrodyne" transceivers.
Thc Institute of Electncal and Electronics Engineers (LEEE) has developed a set of specifications for wireless Local Area Networks (LAN).
which specify an over-the-air interface between a wireless client and a base station or between two wireless clients. These spccifications are commonly referred to as the 802.11 family of specifications. Transceivers complying with these 802.11 standards use both heterodyne and hoinodyne architectures The key feature for heterodyne receivers is the use of an intermediate frequency (IF). Channel selection is thus achieved by the use of a first, vanable locaL oscillator (LO) mixer for downconverting the received signal to a fixed IF. A second, fixed LO mixer is used to convert the fixed IF to the baseband frequency.
A disadvantage of the heterodyne transceiver architecture is the required large number of discrete components, which are usually provided separate to the transceiver chip.
Heterodyne systems for the 802.11 family have used IF bands of 374 MHz, 440 MHz and 1.25-2 GHz. Low IF systems are also reported, sometimes as an alternative mode in a zero-IF transcciver, also known as a homodyne/direct conversion receiver.
A wideband heterodyne transceiver system has been described elsewhere. In wideband IF heterodyne systems, the first U) is fixed and the channel selection is achieved by means of a vanable second LO. This has the advantage of simplifying the design of the first LO. A dual hand system, conftiming to the 802.1 I aIh/g standards has also been described The technique is related to the above described concept, although the first LO is switched hct\veen two or three different values for providing multiple frequency hands In this way a dual conversion frequency plan can he achieved maximising hardware reuse.
When mixing a first input frequency, together with a second frequency m in order to convert C) to the IF, two frequency hands are generated: ui + o =IF and o, - co,. ilowever, only one of the frequency bands is desired. Thus several methods have been developed to reduce or annihilate the signal of the undesired frequency band. These techniques are commonly referred to as image rejection techniques Image Rejection Architecture 1 5 Image rejection in heterodyne systems can be achieved by front end filtering, or by adopting an image rejection architecture. Filtering is viable when the frequency plan is chosen to give a large separation between the wanted band and the image hand.
Below, the use of image rejection techniques used in integrated transceiver- antenna systems is summarised using Figures 3 and 5 from Wu et al, "A 900 MHz! 1.8 GHz CMOS Receiver for Dual-Band Applications", IEEE Journal of Solid-State Circuits, Vol.33, No.12, December 1998.
Fig 3 illustrates a schematic outline of the Hartley Image Reject Receiver Architecture The Hartley architecture, derived from Hartley's single sideband modulator, can be used for Image rejectioil iii a single mixer stage I Jowever, this technique requires IF phase shifters or an IF quadrature coupler. Both are hard to produce with the required phase and amplitude balance. Figure 4 illustrates a version of the Flai-tley architecture used in an integrated antenna receiver by Ismail and Gardner Here, the first signal split is achieved within the antenna.
Fig 7 illustrates a Weaver Iniage Reject Receiver Architecture. The Weaver architecture builds image rejection around both stages of a dual conversion receiver. By using the Weaver architecure the final signal combination is either an addition or subtraction, rather than a qiadratire combination. This is easier to achieve both in hardware and software implementations. A further advantage is that the architecture lends itself to 1 5 dual band use, with the first LO chosen mid-way between the two bands, and the output combiner switching between addition and subtraction, as shown by Wu ci al. in the paper cited above.
ftc image rejection achieved by the Weaver architecture actually functions in respect of the image of the first stage in the mixing process. A potential dfflculty with the Wea'er archiiectuie is the so called secondary image. This arises if the second down conversion does not go all the way to zero frequency: an image exists at a receive &equency of 201+2W2-WIN, where o1 and w2 are the LO frequencies and 2COiN is the RF input frequency.
Ilomod'vne Architectures The majority of integrated transceiver systems reported for the 802. 1 family of standards use direct cons ersion (see for example Song, C T P ci al Packaging technique for gain enhancements of electrically small antenna designed on gallium arsenide" Electronic Letters, vol. 36, Issue 1 8, Aug. 31 2000, pp. 1524-1525, and Alexander Pavlovich Popov et al,"Package Integrated Antenna for cii cular and linear polarizations'', US patent 6879287), where the channel selection is achieved at haseband. Image rejection is not a problem in a zero IF system, because the image and channel coincide. Many of the off-chip components needed in heterodyne systenis are eliminated, leaving typically only the antenna, Tx/Rx switch and RE filter off-chip.
However, a problem with direct conversion is the variable DC offset effect. This arises from self-mixing of the LO (which is, by definition, at the 1 5 same frequency wanted RE signal)and from LO leakage into the RF port of the mixer, either through a leakage path within the transceiver module hardware, or via re-radiation, reflection from nearby (moving) objects and re- reception.
Direct conversion receivers also require a highly stable, high frequency, low phase noise LO, which is a demanding requirement in a iow cost and low voltage IC technology such as CMOS.
Itis thus an aim of the prescnt invention to alleviate the disadvantages descnbed above. It is another aim of the present invention to proide an improved antenna-transceiver system.
According to one embodiment of the present invention, there is provided an antenna system for use in mobile communication terminals, the antenna comprising: an antenna element; a feeding structure for said antenna clement compnsing a first and a second port, the first port being adapted to be supplied with a first signal having a first phase and the second port being adapted to be supplied with a second signal having a second phase; and a transceiver circuit adapted for providing an image rejection functionality.
In this way an improved antenna-transceiver system is provided. The system is suitable for integrated implementations and for time division duplex.
One important advantage of this integrated antenna transceiver design is its inherent image rejection capability. Depending on the preference, this integrated transceiver design allows operation at either ZERO IF or low IF operation, i.e if the LO signals are properly selected, the final down-converted RE signal can either be at the down converted or a low intermediate frequency (IF), allowing the IF filter to be easily implemented.
According to another embodiment of the present invention, there is provided an integrated antenna system for use in mobile communication terminals, the antenna system comprising: a conducting case; a transceiver circuit provided on a substrate inside said conducting case; and an antenna clement, w hcrei ii the sysi cm further comprises an antenna feed struct tire provided on the transceiver circuit substrate; wherein the feed structure CO11IpIISCS a first aiid a sccoiid port, the irsi port i)eiiig adapted to be supplied with a first signal having a first phase and the second port being adapted to he supplied with a Second signal having a second phase; and herein the transceiver circuit is adapted for pro\'i(llng an image rejection functionality.
According to another aspect of the present invention, there is provided an integrated antenna system for use in niobile communication terminals, the antenna system comprising a conducting case, a transceiver circuit provided on a substrate inside said conducting case, and an antenna element; wherein the system further comprises a feed structure provided on the chip carrier of the transceiver circuit chip; wherein the fecd structure comprises a first and a second port, the first port being adapted to be supplied with a first signal having a first phase and the second port being adapted to he supplied with a second signal having a secoiid phase; wherein the feed structure is directly applied to the transceiver chip carrier; and wherein the transceiver circuit is adapted for providing an image rejection functionality.
According to yet another aspect of the present invention, there is provided an integrated antenna system for use in mobile communication terminals, the antenna system compnsing: a conducting case, a transceiver circuit provided on a chip inside said conducting case; and an antenna clement; wherein the system further comprises a feed structure provided on the transceiver chip; wherein the feed structure comprises a first and a second port, the first port being adapted to he supplied with a first signal ha ing a first phase and the second poi-t being adapted to he supplied with a second signal having a second phase, and wherein the transceiver circuit is adapted for providing an image rejection functionality Embodiments of the present invention will now he described, by example only, with reference to the accompanying figures, whereby: Fig. 1 is a schematic front view of a mobile terminal in which the present invention can be implemented; Fig. 2 is a schematic illustration of a Ilartley image reject receier 1 0 architecture according to the jrior art; Fig. 3 is a schematic illustration of an ALA image reject receiver
architecture according to the prior art,
Fig. 4 is a schematic illustration of a Weaver inlage reject receiver
architecture according to the prior art,
Fig. 5 is a schematic illustration of a modified Weaver image reject receiver architecture according to one embodiment of the present invention; Fig. 6A and B are schematic illustrations of off-chip implementations of two differential feed non-contact coupling integrated antenna systems accordmg to another embodiments of the present invention; Fig. 7A is a schematic illustration of an on-carrier implementation of a differential feed non-contact coupling integrated antenna system according to another embodiments of the present invention; and Fig 713 is a schematic illustration of an on-chip implementation of a differential feed non-contact coupling integrated antenna system according to yet another embodiments of the present invention Figure 1 is a schematic illustration of a mobile communication S terminal I C) The terminal IC) includes a display 2, microphone I 6, speakers 1 8, a keypad 21, antenna 20 and navigation keys 23.
Differential feed image rejection antenna In the following the concept of the differential Feed image rejection 1 0 antenna method will be described with reference to Figure 6 Figure 6 is a schematic illustration of a modified Weaver's image rejection receiver architecture suitable Ibr the use with a differential antenna.
In the embodiment described below a dual-hand antenna is used. The antenna system transmits and receives at a lower band of 2 45G1 lz and an upper band of 5 GHz. The signals of the lower and upper hand arc denoted as (Of and w1, , respectiveJy. These signals can be received simultaneously by the balanced feed antenna as illustrated in Figure 2. The antenna used may either be a dual-band or wideband antenna.
The system includes a balanced antenna 103 with two oLitput ports 104 and 106. Coupled to the two output ports 104 and 106 at points A and B is a dfferenta1 low nojse ampljfler (LNA) 105. Coupled to the differential LNA at points C and D is a differential mixer 107. A local oscillator provides a signal with frequency. At point F the incoming signal is mixed with 1 0 sin( (OfQ), and a point F the incommg signal is accordingly mixed with cos( o) Each of the two outputs of the differential mixer 107 are then coupled to a low pass filter (LPF) 108. A second di lierential mixer 100 is coupled to the LPFs 108 A second local oscillator pros ides a signal with ftequency o. . At point I the incoming signal is mixed with sin( wf). ), and a point J the incoming signal is accordingly mixed with cos( w. ). Each ol the two outputs of the differential mixer 107 are then coupled to a low pass filter (LPF) 108. The two output signals are then coupled together to a combined output signal at point K. At p01111 A, the received signal is given by = cos(o(/t + (OLI) and at point B, the received signal is 0RF -eOs(W11 + (OLI) Mixer Stage For the purpose of illustrating the transceiver's operation, the LNAs are assumed to be linear and capable of either wideband or dual band operation.
This implies that (lie signals at points C and D are similar to the signal at points A and B respectively. After (lie first mixer stage, the upper and lower band signals are mixed with (lie first local oscillator signal and (lie following signals are generated.
At point E, the mixer output signal is given by 1st Mixerll = cos(o1 I + wI) sin(w1 1) + w, )i + sin(w10 - ( )i + - Sifl(Wim + (0, )t + sin((0101 0L)i and at point F, the micr output is I st Mixer, = - cos((o1 I -f (0 I) cos(o,011) -- - C0S(o),, + 010)I - cos(o - )t - - COS((01 + )i - cos(w1 -(Oi)1 LPF S1ai.e Ihe mixer outj)ut signals are then passed through a low l)SS tilter( LPF) to rcmovc the up-converted high frequency components. This allowed only the desired low frequency signal to pass through After filtering, the signals at point G are LPF(UI sin( ,, - (O)I + sin(w101 L)t and at Point H, LPlt. cos(w, - w101)t - cos(w1 - w101)i 2nd Mixer Stage The signals are then passed through another mixer stage.
At point I, the mixer output signal components are 2nd Mixe,111 = (!5jfl() - (01, )t + sin(w101 - 0L)t)sin(o101t) and at poilit J, the mixer output when the oscillator signal is cos(w1021) are given by 2nd Mixer. = (-1cos(w(, - w10)i - !O5(1 - (0JQ)t)cos(010/) - Cos(w - (0/Q + (0/a, )t 1cos(w - - 0w, - COS((01 - (0L,I + (0i: )t - 1cos(w1 - L0l - (O/Q7)1 When the output of the 2d stage mixer are combined, the signals at the IF at point K are given by IF 2nd MiXe1 ri + 2nd Mixei1 = - cos(w101 - (, + w10. )1 + i cos(w101 (, - (00. )t cos(w101 - 0L + (0L02)t + -cos(w10 - - w10. )t - cos(w1, - + 0L0)t - !O5(, - (0101 - w, )t - cos(o1 - 0L0l + (0/0, cos( - I (I - (0)i - COS((0,, - - w10, )i - cos(, - (0/Q] + (Oj, )i - cos(W101 - (0 + (0/02)1 + cos(w10 - (0/ - L02)t - cos(, - 0L0l + (0/Q2)t cos( - 0L01 - 0L02)t + cos(w10 - 0L + L02)t + cos(o101 - - L02)t = -1cos(w(,. - 0L0I + )t + !cos(w101 - 0L - w102)1 In this case, only the lower band signal (2.45 GHz) has been down- converted. The image or upper band signal (5Ghz) has been effectively cancelled.
The reverse is also true for the upper hand fi-equency (5 GHz) if the oscillator at point.1 is inverted In this case, the mixer signals at point.1 are given by 1 1 2nd MixeiU, = (-- cos(w - (0)i -- cos(W - o1)t) cos( W1 - 1 80 ) 2 2 L - 2nd Mixe, = (cos(, - WLQI)i + -cos(w1 (01)I)cos(w1I) + -cos( (O - + o. )t = -cOS(O)1, - + (OLO: )t + - eos(W1, WLOI - WLO2)t cos(W1 - (UI - )t When the output of the 21(1 stage mixer arc combined (1+J) with the inverted 2h1 mixer output signals, the signals at the IF at point K arc given by 1F = 2nd Mixer111 + 2nd Mixerç L0I -(D(/ - w102)t - cos(w10 - + w102)r = cos(w1 - (1 + (0L02)t + cos( 4 4 (0 WLOI - (0/02)1 + cos((O1,1 - - w102)t + cos((O1 - (o,oi + (.0/02)1 + cos( + cos(w1 - + (O/Q2)t + cos(co1 - (0i.oi - 0L02)t 1 1 )t - - cos(w10 - + 0L02)1 - cos(w1, - (0/Q( - )t - - cos(a1 - (Oi.oi + 0L02 - (0 - I') )t -i- er( 1) (.) - (0 - cos(W - L02)t + cos(WL, 1.01 IX)2 \L/ /.QI LU2 cos(w101 - (Of + (OLO2)l - cos(OLQJ - - (OLO2)i = 1cos(w1 - - (On, )I -cos(w10 - + (o)t In this case, the upper hand signal has been dow'n-con\ cried while the lower band signal has been cancelled In the iollowinL, there are described four different examples of implementing the differential antenna system including the image rejection technique Off (hip Implementation As explained above, the trend towards a transceiver chip suitable for multiple standards implies that a multi-hand antenna or a reconfigurable antenna capable of operating at various distinct fi-equencies is desirable In order to implement an antenna suitable for these requirements, one possibility is to implement the feeding and antenna strLictures extenially to the transceiver IC chip. Such an implementation will he referred to as off chip' antenna in the fbllowing. In this way an increased flexibility in design an(l a reduction in the chip earner size can he achieved. This will then also result in a reduced cost of the radio frequency transceiver chip Referring now to Figure 6, two different integrated antenna systems in an oliclup implementation will be described.
Figures 6A and B illustrate a first and a second implementation, respectively. In both eases, the radio frequency front end circuitry is enclosed inside a metal conducting box 601. This results in good electromagnetic shielding of the device.
In both cases the conducting box 601 includes a substrate 603, and mounted thereon a transceiver chip 608 and a feed line 602. The feed line 602 is constructed such that it is suitable for a non-contact coupling such as those described above. The conducting box 601 is closed by ground plane 605.
Figure 6 also includes a suitable design for the transceiver chip 608, comprising low noise amplifiers (LNA) 610 and mixers 612.
In the first implementation shown in Figure 6A, a coupling slot 606 is introduced into the ground plane 605 of the conducting box 601 Electromagnetic energy is coupled through the slot 606 to an external 1) atcll antenna 609 mounted to antenna substrate 607. Patch antenna 609 is covered by a radome 6 11 In the second implementation shown in Figure 6B the energy is directly coupled to a slot antenna 604 in ground plane 605.
On Chip or On Carrier Implementation Alternatively to the implementation described above, so-called on- 1 5 chip' or on carrier' implementations are possible, wherein the di iferential leeding network for the antenna can be implemented either on the silicon chip or on the chip carrier, respectively.
Referring now to Figure 7, a differential feeding network implementations on chip' and another one on chip carrier' will he described with reference to Figures 7A and 8B, respectively.
In both cases, the radio frequency front end circuitry is enclosed inside a metal conducting box 701. The conducting box 701 includes a circuit substrate 703, and mounted thereon is a transceiver chip carrier. The IC chip 708 together with the feed line 702 is mounted on lop of the chip carrier. The transcei er chip carrier is then mounted onto the circuit substrate 703 by conventional soldering techniques. Again, the feed line 702 iS constructed such that it is suitable for a non-contact coupling such as those described aboe The condi.icting box 701 is closed by ground plane 705 The di fierential feeding structure 702 has been etched onto to tile chip carrier 703 together with a coupling slot 706. lhe electromagnetic energy is then coupled through the aperture slot 706 directly to tile patch antenna 709 etched onto the conducting box 701 Figure 7 also includes a suitable design for the transceiver chip 708, comprising RFCs 716, bias tees 714, RF signal source 718, anipli11ers 720, power source 722 and connections to the 1ed lines 730 of the feeding structure 702 on the chip camer 703. The differential anipli 11cr 720 of the radio frequency circuitry is (lirectly wire bonded to the differential through line 730 Referring now to Figure 7B, the on-chip implementation will be described. Here, the differential feeding structure 740 is implemented on the transceiver chip 708 itself. The outline of the antenna structure is similar to the on-carrier implementation described above. 1-lowever, the transceiver chip here includes the feed lines 740, which provide a gap 742 between the microstrip lines 740 for providing proximity coupling as described above, and the antenna structure 709 has been etched ori the conducting box 701.
In this way the electromagnetic energy is coupled directly from the onchip differential amplifiers 720 to the cx ternal antenna 709 Whilst in the above described embodiments a dual hand transceiver antenna system has been described, it is appreciated that alternatively an antennatransceiver system with more than two frequency bands can be provided. The desigii may he converted to cover more frequency hands. This may for example he achieved by designing the frequency synthesizer to generate the necessary LO signals. Note that in these cases, the filters, amplifiers and mixers are assumed to be either wideband or multi-hand capable.
It is to be understood that the above describes embodiments are set out by way of example only, and that many variations or modifications are possible within the scope of the appended claims
Claims (23)
- CLAIMS: 1. An antenna system for use in mobile communication tcnmnals, theantenna comprising an antenna element; a feeding structure for said antenna clement compnsing a first and a second port, the first port being adapted to be supplied with a first signal having a first phase and the second port being adapted to be supplied with a second signal having a second phase; and a transceiver circuit adapted for providing an image rejection functionality.
- 2. An antenna system as claimed in claim 1, wherein said antenna element is not in contact with said feeding structure.
- 3. An antenna system as claimed in claims 1 or 2. wherein the antenna is balanced.
- 4 An antenna system as claimed in claims 1, 2 or 3, wherein the transceiver circuit compnses a differential amplifier.
- 5. An antenna system as claimed in any preceding claim, wherein the image rejection functionality is provided by a Weaver type circuit
- 6. An antenna systcm as claimed in any preceding claim, whercin the transceiver circuit compnscs a first differential mixer, low pass filters and a second differential mixer.
- 7. An antenna system as claimed in any preceding claims, hcrein the antenna element has two output ports.
- 8. An antenna system as claimed in claim 7, wherein the two output ports or coupled to a differential low noise amplifier
- 9. An antenna system as claimed in claim 8, wherein the two ports of the differential low noise amplifier are coupled to a differential mixer.
- 10. An antenna system as claimed in claim 9, wherein each of the two ports of the differential mixer is coupled to a low pass filter.
- 11. An antenna system as claimed in claim 10, wherein each of low pass filters are coupled to a second differential mixer.
- 12. An antenna system as claimed in claim 11, wherein the two outputs of the second differential mixer are added together.
- 1 3 An integrated antenna system for use in mobile communication terminals, the antenna system comprising a conducting case, a transceiver circuit provided on a substrate inside said conducting case, and an antenna element; wherein the system further comprises an antenna feed structure provided on the transceiver circuit substrate, wherein the feed structure comprises a first and a second port, the first port being adapted to be supplied with a first signal having a first phase and the second port being adapted to he supplied with a second signal having a second phase; and wherein the transceiver circuit is adapted for providing an image rejection functionality
- 14. An antenna system according to claim 1 3, wherein said antenna element is a slot antenna provided in a ground plane.
- An antenna system according to claim 13, wherein said antenna element is a patch antenna.
- 16. An antenna system according to claim 1 5, wherein said antenna system further comprises a ground plane situated in bet\ cen the transceiver circuit substrate and the patch antenna
- 1 7. An antenna system according to claim 15 or 16, wherein said ground plane includes an aperture slot.
- 18. An integrated antenna system for use in mobile communication terminals, the antenna system comprising a conducting case, a transceiver circuit provided on a substrate inside said conducting case, and an antenna element; wherein the system further comprises a feed structure provided on the chip carrier of the transceiver circuit chip; wherein the feed structure comprises a first and a second port, the first port being adapted to be supplied with a first signal having a first phase and the second port being adapted to he supplied with a second signal having a second phase; vherein the feed structure is directly applied to the transcei er chip carrier; and wherein the transceiver circuit is adapted for providing an image rejection functionality.
- 1 9. An antenna as claimed in claim 18, wherein the feed structure is etched into the transceiver chip carrier
- 20. An antenna as claimed in claim 1 8 or 1 9, whereiii an aperture slot is provided for coupling the signals from the Feed structure to the antenna element.
- 21. An antenna as claimed in claim 18, 19 or 20, wherein the aperture 1 0 slot is etched into the transceiver chip carrier
- 22. An antenna as claimed in any of claims 18 to 2 1, wherein the patch antenna is etched into the ground plate.
- 23. An integrated antenna system for use in mobile conimunication terminals, the antenna system comprising: a conducting case, a transceiver circuit provided on a chip inside said conducting case; and an antenna element, wherein the system further comprises a feed structure provided on the transceiver chip; wherein the feed structure compnses a first and a second port, the first port being adapted to be supplied with a first signal ha ing a first phase and the second port being adapted to be supplied with a second signal having a second phase; and wherein the transceiver circuit is adapted for providing an image rejection functionality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0513054A GB2427760B (en) | 2005-06-27 | 2005-06-27 | Antenna-transceiver system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0513054A GB2427760B (en) | 2005-06-27 | 2005-06-27 | Antenna-transceiver system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0513054D0 GB0513054D0 (en) | 2005-08-03 |
| GB2427760A true GB2427760A (en) | 2007-01-03 |
| GB2427760B GB2427760B (en) | 2010-01-20 |
Family
ID=34856199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0513054A Expired - Fee Related GB2427760B (en) | 2005-06-27 | 2005-06-27 | Antenna-transceiver system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2427760B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9147938B2 (en) | 2012-07-20 | 2015-09-29 | Nokia Technologies Oy | Low frequency differential mobile antenna |
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|---|---|---|---|---|
| GB2292012A (en) * | 1990-01-19 | 1996-02-07 | Secr Defence | Circuit module for a phased array radar |
| WO1998049741A1 (en) * | 1997-04-30 | 1998-11-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Microwave antenna system and method |
| US6078791A (en) * | 1992-06-17 | 2000-06-20 | Micron Communications, Inc. | Radio frequency identification transceiver and antenna |
| US20020173337A1 (en) * | 2001-03-14 | 2002-11-21 | Seyed-Ali Hajimiri | Concurrent dual-band receiver architecture |
| US20030129955A1 (en) * | 2002-01-08 | 2003-07-10 | Gilmore Robert P. | Walking weaver image reject mixer for radio |
| WO2004032343A2 (en) * | 2002-10-02 | 2004-04-15 | University Of Florida | Single chip radio with integrated antenna |
| GB2408149A (en) * | 2003-11-17 | 2005-05-18 | Bosch Gmbh Robert | Laminated antenna structure with screening and differential feed arrangements |
-
2005
- 2005-06-27 GB GB0513054A patent/GB2427760B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2292012A (en) * | 1990-01-19 | 1996-02-07 | Secr Defence | Circuit module for a phased array radar |
| US6078791A (en) * | 1992-06-17 | 2000-06-20 | Micron Communications, Inc. | Radio frequency identification transceiver and antenna |
| WO1998049741A1 (en) * | 1997-04-30 | 1998-11-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Microwave antenna system and method |
| US20020173337A1 (en) * | 2001-03-14 | 2002-11-21 | Seyed-Ali Hajimiri | Concurrent dual-band receiver architecture |
| US20030129955A1 (en) * | 2002-01-08 | 2003-07-10 | Gilmore Robert P. | Walking weaver image reject mixer for radio |
| WO2004032343A2 (en) * | 2002-10-02 | 2004-04-15 | University Of Florida | Single chip radio with integrated antenna |
| GB2408149A (en) * | 2003-11-17 | 2005-05-18 | Bosch Gmbh Robert | Laminated antenna structure with screening and differential feed arrangements |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9147938B2 (en) | 2012-07-20 | 2015-09-29 | Nokia Technologies Oy | Low frequency differential mobile antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0513054D0 (en) | 2005-08-03 |
| GB2427760B (en) | 2010-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20180627 |