DE19947798A1 - Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it - Google Patents

Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it

Info

Publication number
DE19947798A1
DE19947798A1 DE1999147798 DE19947798A DE19947798A1 DE 19947798 A1 DE19947798 A1 DE 19947798A1 DE 1999147798 DE1999147798 DE 1999147798 DE 19947798 A DE19947798 A DE 19947798A DE 19947798 A1 DE19947798 A1 DE 19947798A1
Authority
DE
Germany
Prior art keywords
antenna
characterized
patch antenna
amplifier according
antenna amplifier
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Withdrawn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
DE1999147798
Other languages
German (de)
Inventor
Kurt Janus
Original Assignee
Kurt Janus
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 Kurt Janus filed Critical Kurt Janus
Priority to DE1999147798 priority Critical patent/DE19947798A1/en
Publication of DE19947798A1 publication Critical patent/DE19947798A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/005Record carriers for use with machines and with at least a part designed to carry digital markings the record carrier comprising an arrangement to facilitate insertion into a holding device, e.g. an arrangement that makes the record carrier fit into an etui or a casing
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/148Reflecting surfaces; Equivalent structures with means for varying the reflecting properties
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/007Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/0407Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means

Abstract

The amplifier has a transponder patch antenna (ANT) coupled to a lambda resonator (R) arranged in parallel with the patch antenna and at a defined distance from it. The patch antenna is square and is aligned with the lambda resonator, which can consist of a wire or metal band or a conducting track. A layer of material with a dielectric constant of about 1 is arranged between the antenna and resonator.

Description

The invention relates to a passive antenna amplifier for use in Transponder systems in the UHF range with a λ resonator as a passive Reinforcing element, the transponder having at least one patch Antenna includes.

Transponder systems of the type under consideration here consist of a Reading unit and a transmission unit, being in a transmission field stored coded data or the corresponding to this data Information to be read out.

The transmission ranges range from a few centimeters to one meters depending on the frequency and possibly the best interference.

The transponders are in particular in credit card format with a maximum thickness of 1-3 mm and designed so that the Power consumption is minimized to ensure the longest possible life with the to reach existing battery.

To increase the range of such known systems, either the performance is increased or working with active antennas. Both results in an undesired additional power requirement.

Active methods are known in particular, in which with the aid of a fed electrical voltage the effectiveness of the antenna in the UHF Area can be improved. Through series connection of the flat An  tenne with a capacitance diode you can influence the antenna parameters flow by placing a control chip over a high-impedance resistor that sets the antenna to reflect or absorb. This enables the transmission of binary information by using for example, the reflective state, the "high" state and the absorber The corresponding state corresponds to the "low" state.

To the effectiveness of the reflective antenna, i. H. the antenna gain in this operating state, can improve in known such Antennas the antenna area are enlarged, which, for. B. by a two-dimensional structure of phase-synchronous antenna arrays possible is.

A major disadvantage of this approach lies alongside the larger one Space requirements in that supply lines of different lengths to the individual NEN antenna elements lead to a phase shift of the signals can, which must be compensated for by special strip conductors. On Another problem is the higher susceptibility to interference of larger supply lines gene.

Proceeding from this, the invention is based on the object to design tennis reflection amplifiers of the type mentioned at the beginning, that without increasing the energy expenditure and without accepting the ge described disadvantages of an enlarged antenna area an increase the reflected antenna power can be achieved.

This object is achieved in that the patch Antenna of the transponder is coupled to a λ resonator, which is parallel  lel to the patch antenna at a defined distance from this is not.

This configuration means that there is no need to enlarge the area and additionally Chen energy needs a significant improvement in antenna performance achieved. Furthermore, the configuration according to the invention is a Spreading the bandwidth compared to a conventional patch antenna reached. Another advantage is that there is no phase compensation different patch elements is necessary.

It is advantageously provided that the patch antenna is square, in particular that the patch antenna and resonator are congruent.

The resonator can advantageously be made of a wire or metal strip stand.

A layer of a material, such as foam or the like, with a dielectric constant ε r of approximately 1 is advantageously arranged between the patch antenna and the resonator.

The distance between the patch antenna and the resona is favorably tor 0.05 times to 0.1 times the wavelength λ corresponding to the over transmission frequency.

The resonator should have an edge length of about ¼ of the wavelength speaking of the transmission frequency.  

A card-like substrate for the patch antenna with a dielectric precision constant ε r ≈ 4 is advantageously provided.

The invention is described below on the basis of a preferred embodiment example explained in connection with the drawing. Show:

Fig. 1 is a schematic illustration of a circuit arrangement of a patch antenna with a control voltage according to the prior art,

Fig. 2 is a perspective view of a antenna apparatus An shown in Fig. 1,

Fig. 3 is a perspective, schematic representation of a modern fiction, the antenna amplifier,

Fig. 4 shows an amplifier housing, and

Fig. 5 is a section through the housing according to Fig. 4.

In Fig. 1, an antenna arrangement is shown in block diagram form comprising a patch antenna (ANT), the adjacent ground planes (GND) forming a UHF resonator. The frequency is determined by the edge length of the square antenna (ANT) and is inversely proportional to the wavelength λ. Through the series connection of the antenna (ANT) and two capacitance diodes (D) shown, the parameters of the antenna (ANT) can be influenced via a control voltage U st which is fed via a high-resistance resistor R1 in the middle between the two capacitance diodes (D) .

By changing the control voltage, the effective area of the patch antenna (ANT) is changed for a defined frequency, so that the antenna can be set either as an optimal reflector or absorber for the incoming waves of wavelength λ. If the control voltage U st follows the information content of binary information (H or L), it is possible to transmit this information by reflection ≈ H or absorption ≈ L with the aid of an unmodulated carrier.

The arrangement according to FIG. 1 is shown in perspective in FIG. 2. From this it can be seen that the antenna substrate defines the thickness d of the material with the dielectric constant ε r .

The antenna area has the dimensions l × w, where for l:

For w: w ≧ 1

The ground plane (GND) is on the back of the circuit board substrates (Ls), on the top of which the patch antenna (ANT) is applied is, in which case plated-through holes are provided in each case.

An embodiment according to the invention is shown in FIGS. 3 and 4. It is provided that

is. At a distance dl corresponding to 0.05 times to 0.1 times the wavelength λ corresponding to the working frequency, an additional resonator (R) is arranged, which has the total length λ. It is made on a metal wire or ribbon and is square with dimensions

educated.

An optimal electrical coupling of the two structures in the near field is achieved if l = l 1 and the dielectric of the circuit board substrate (Ls) ε r ≈ 4. This results in a shortening factor for the antenna

The distance d1 between the antenna (ANT) and the resonator (R) is determined by means of a material layer, e.g. B. foam, set with a dielectric constant ε r ≈ 1. This is not shown in Fig. 3.

In Fig. 4 an amplifier housing (G) is shown in perspective and in Fig. 5 in section, which serves to accommodate a transponder. This is an advantage, since the electronic ID (transponder) should normally not exceed a thickness of 1 mm, but does not require a long range. The same transponder can now be plugged into the amplifier housing (G), for example, in which the resonator (R) is integrated. The necessary distance (d1) to the reflector is already specified by the construction of the housing.

Claims (12)

1. Antenna amplifier for use in transponder systems in the UHF range with a λ resonator as a passive reinforcement element, where the transponder comprises at least one patch antenna, characterized in that the patch antenna (ANT) of the transponder with a λ resonator (R) is coupled, which is arranged parallel to the patch antenna (ANT) at a defined distance d1 from it.
2. Antenna amplifier according to claim 1, characterized in that the patch antenna (ANT) is square.
3. Antenna amplifier according to claim 1, characterized in that Patch antenna (ANT) and λ resonator (R) are congruent.
4. Antenna amplifier according to claim 1, characterized in that the λ resonator (R) consists of a wire or metal strip or egg ner conductor track.
5. Antenna amplifier according to claim 1, characterized in that between the patch antenna (ANT) and λ resonator (R) a layer of egg nes material, such as foam or the like, is arranged with a dielectric constant ε r of about 1.
6. Antenna amplifier according to claim 1, characterized in that the distance between the patch antenna (ANT) and the λ resonator (R)  0.05 to 0.1 times the wavelength λ corresponding to the transfer frequency is.
7. Antenna amplifier according to claim 1, characterized in that the λ resonator (R) has an edge length of about ¼ of the wavelength corresponding to the transmission frequency.
8. Antenna amplifier according to claim 1, characterized in that a card-like substrate (Ls) for the patch antenna (ANT) is provided with a dielectric constant ε r ≈ 4.
9. Antenna amplifier according to claim 1, characterized in that the antenna amplifier represents a separate housing (G) and for loading attachment to any object is formed.
10. Antenna amplifier according to claim 9, characterized in that the antenna amplifier has a slot (S) which is used to receive the Transponders (TRP) is used.
11. Antenna amplifier according to claim 9, characterized in that the λ resonator is integrated in the housing (G).
12. Antenna amplifier according to claim 9, characterized in that the necessary distance (d1) through the slot and its distance to (R) is provided in a constructive manner and the condition ε r ≈ 1 is met optimally.
DE1999147798 1999-10-05 1999-10-05 Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it Withdrawn DE19947798A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1999147798 DE19947798A1 (en) 1999-10-05 1999-10-05 Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999147798 DE19947798A1 (en) 1999-10-05 1999-10-05 Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it

Publications (1)

Publication Number Publication Date
DE19947798A1 true DE19947798A1 (en) 2001-04-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE1999147798 Withdrawn DE19947798A1 (en) 1999-10-05 1999-10-05 Passive antenna reflection amplifier has square transponder patch antenna coupled to lambda resonator arranged in parallel with patch antenna and at defined distance from it

Country Status (1)

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DE (1) DE19947798A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4835538A (en) * 1987-01-15 1989-05-30 Ball Corporation Three resonator parasitically coupled microstrip antenna array element
US4987421A (en) * 1988-06-09 1991-01-22 Mitsubishi Denki Kabushiki Kaisha Microstrip antenna
EP0564927A1 (en) * 1992-04-10 1993-10-13 Siemens Aktiengesellschaft Hermetically closed temperature stable data memory device
US5307075A (en) * 1991-12-12 1994-04-26 Allen Telecom Group, Inc. Directional microstrip antenna with stacked planar elements
US5552790A (en) * 1992-01-23 1996-09-03 Saab-Scania Combitech Aktiebolag Device for wireless transfer of information
EP0584657B1 (en) * 1992-08-24 1998-06-03 Siemens Aktiengesellschaft Method and apparatus to protect data within mobile read/write data carriers
US5874919A (en) * 1997-01-09 1999-02-23 Harris Corporation Stub-tuned, proximity-fed, stacked patch antenna

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4835538A (en) * 1987-01-15 1989-05-30 Ball Corporation Three resonator parasitically coupled microstrip antenna array element
US4987421A (en) * 1988-06-09 1991-01-22 Mitsubishi Denki Kabushiki Kaisha Microstrip antenna
US5307075A (en) * 1991-12-12 1994-04-26 Allen Telecom Group, Inc. Directional microstrip antenna with stacked planar elements
US5552790A (en) * 1992-01-23 1996-09-03 Saab-Scania Combitech Aktiebolag Device for wireless transfer of information
EP0564927A1 (en) * 1992-04-10 1993-10-13 Siemens Aktiengesellschaft Hermetically closed temperature stable data memory device
EP0584657B1 (en) * 1992-08-24 1998-06-03 Siemens Aktiengesellschaft Method and apparatus to protect data within mobile read/write data carriers
US5874919A (en) * 1997-01-09 1999-02-23 Harris Corporation Stub-tuned, proximity-fed, stacked patch antenna

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
AL-CHARCHAFCHI,Sami H., et.al.: Experimental Performance Of An L-Band Microstrip Antenna. In: Microwave Journal, Jan. 1998, S.170,172,175,176 *
CROQ,F., et.al.: Stacked resonators for bandwidth enhancement: a comparison of two feeding techniques. In: IEE Proceedings-H, Vol.140, No.4, Aug. 1993, S.303-308 *
EGASHIRA,Shigeru, NISHIYAMA,Eisuke: Stacked Microstrip Antenna with Wide Bandwidth and High Gain. In: IEEE Transactions On Antennas And Propagation, Vol.44, No.11, Nov. 1996, S.1533- S.1534 *
RAY,G.Le, et.al.: Frequency agile slot-fed patch antenna. In: Electronics Letters, 4th Jan. 1996, Vol.32, No.1, S.2,3 *
SANAD,Mohamed, AMANT,Noha Hassan: An Internal Integrated Microstrip Antenna for PCS/Cellular Telephones and Other Hand-held Portable Communication Equipment. In: Microwave Journal, July 1998, S.64,66-70,73,74,77 *

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