EP0982800A2 - Dispositif de retard à hautes fréquences comportant des surfaces à sélection de fréquence - Google Patents
Dispositif de retard à hautes fréquences comportant des surfaces à sélection de fréquence Download PDFInfo
- Publication number
- EP0982800A2 EP0982800A2 EP19990306458 EP99306458A EP0982800A2 EP 0982800 A2 EP0982800 A2 EP 0982800A2 EP 19990306458 EP19990306458 EP 19990306458 EP 99306458 A EP99306458 A EP 99306458A EP 0982800 A2 EP0982800 A2 EP 0982800A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- signal
- frequency selective
- antenna
- signals
- 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- Withdrawn
Links
- 239000000463 material Substances 0.000 description 12
- 239000000758 substrate Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000271 Kevlar® Polymers 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000004761 kevlar Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0033—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective used for beam splitting or combining, e.g. acting as a quasi-optical multiplexer
Definitions
- the present invention relates to signal delay devices; more particularly, frequency selective delay devices.
- FIG. 1 illustrates upchirp FM pulse 10 in which the frequency increases with time.
- the figure illustrates pulse 10 propagating in the direction of arrow 12.
- the multifrequency pulse in this example has three major frequency components. Section 14 contains a low frequency signal component, section 16 contains a mid-range frequency signal component and section 18 contains a higher frequency signal component.
- Frequency selective delay devices have been used in the past to compress or stretch multifrequency pulses. For example, in a pulse compression application the frequency selective delay devices compress the pulse by providing little or no delay to high frequency components 18, providing some delay to mid-frequency range components 16, and providing a larger amount of delay to lower frequency components 14.
- magnetostatic delay devices In the past, devices such as a magnetostatic delay devices were used.
- the magnetostatic delay line worked well with high frequency signals, such as 4 Gigahertz signals; however, it was a heavy, bulky and expensive device.
- SAW devices surface acoustic wave
- SAW devices have been used and are less bulky than the magnetostatic delay lines; however, SAW devices do not work well above 1 Gigahertz.
- the present invention solves the aforementioned problem by providing a broadband frequency selective delay device in a small configuration.
- a source antenna transmits the multifrequency signal in the direction of several frequency selective surfaces. Each of the frequency selective surfaces redirects a different frequency component of the signal to a receive antenna that combines the redirected signal components to produce a compressed signal or a stretched signal, depending on the way in which the frequency selective devices are arranged.
- a signal such as an upchirp pulse is compressed.
- An upchirp pulse is a signal where lower frequency components are transmitted before higher frequency components.
- the first frequency selective surface redirects the higher frequency components of the signal and allows the other components to pass.
- Subsequent frequency selective surfaces redirect components of the multifrequency signal while allowing the lower frequency components to pass until the lowest frequency signal has been redirected.
- the different frequency selective devices are positioned at different distances from the receive antenna. These different distances result in each of the different frequency components of the multifrequency signal traveling different distances.
- the signal is compressed because the lower frequency signal component travels the longest distance and the higher frequency components travel shorter distances.
- an upchirp pulse is stretched by reversing the order in which the frequency selective surfaces are arranged.
- the first frequency selective device redirects lower frequency components and subsequent frequency selective devices redirect higher frequency components. This results in the signal being stretched because lower frequency components travel a shorter distance than the higher frequency components.
- a small device package is provided by using a material with a high dielectric constant inside the frequency selective delay device which will increase the total time delay and further increase the delay ratio between the different frequency components.
- FIG. 2 illustrates a high frequency delay device using frequency selective surfaces.
- the delay device is enclosed in enclosure 30 which should be fabricated from a conductive material such as aluminum in order to prevent radiation leakage.
- Input 32 provides the received signal to antenna 34.
- Antenna 34 may be implemented using a patch, spiral log periodic or broadband antenna.
- Antenna 34 transmits, for example, the upchirp FM signal of FIG. 1 in the direction of arrow 36 toward frequency selective surfaces 38, 40 and 42.
- Frequency selective surface 38 reflects or redirects high frequency signals and allows lower frequency signals to pass.
- frequency selective surface 38 reflects signals corresponding to component 18 of pulse 10 while allowing signal components 16 and 14 to pass.
- frequency selective surface 40 reflects signal component 16 while allowing signal component 14 to pass.
- Frequency selective surface 42 will then reflect signal component 14.
- the distances traveled by each of the signal components is controlled by varying angle 44 and/or the distances between the frequency selective surfaces. Further delay between the different frequency components can be introduced by filling the media with high dielectric constant material which decreases the propagation velocity and thereby increases the relative delays between the frequency components.
- the distance L1 traveled by the higher frequency component 18 can be adjusted relative to the longer distance L2 traveled by lower mid-range frequency component 16 by varying the distance between frequency selection surfaces 38 and 40.
- the relative distance traveled by lowest frequency component 14 can be adjusted by varying the distance between frequency selective surface 42 and frequency selective surfaces 38 and 40.
- Antenna 46 may be implemented as a patch or spiral antenna.
- an upchirp pulse is stretched by reversing the order in which the frequency selective surfaces are arranged.
- the first frequency selective device redirects lower frequency components and subsequent frequency selective devices redirect higher frequency components. This results in the lower frequency components traveling a shorter distance than the higher frequency components and thereby stretches the signal.
- multifrequency signals such as downchirp FM pulses may be stretched or compressed.
- high frequency signal components are transmitted before lower frequency components.
- the input signal is transmitted towards frequency selective surfaces arranged such that the higher frequency components travel a shorter distance than the lower frequency components.
- compressing the downchirp pulse the frequency selective devices are arranged such that the lower frequency components travel a shorter distance than the higher frequency components.
- the overall size of the frequency selective delay device may be decreased by filling the volume enclosed by enclosure 30 with a material having a high dielectric constant such as ceramics with relative dielectric constant ( ⁇ r ) ranging from 10 to over 10,000.
- a material having a high dielectric constant such as ceramics with relative dielectric constant ( ⁇ r ) ranging from 10 to over 10,000.
- FIG. 3 illustrates a frequency selective surface.
- the frequency selective surface comprises metal film patterns 60 that are located on substrate 62.
- Metal film patterns 60 may be constructed using a conductive material such aluminum, copper, silver or tin, and substrate 62 may be constructed using fiberglass or KEVLAR type polyamide material sheets that are, for example, between 1 and 5 mils thick. (KEVLAR is a registered trademark of E. I. DuPont.) Patterns 60 are illustrated as squares but it is also possible to have patterns such as patterns 64 on substrate 68 or circular patterns 70 on substrate 72. The frequency selectivity of the surfaces are based on the dimensions and shapes of these patterns.
- FIG. 4 illustrates an example of a frequency selective delay device using graduated frequency selective surfaces.
- the FM upchirp is provided on input line 100 to antenna 102.
- Antenna 102 may be an antenna such as a patch, spiral log periodic or broadband antenna.
- the signal is transmitted in the direction of arrow 104 towards graduated frequency selective surface 106.
- Graduated frequency selective surface 106 has different reflective properties depending on the position or area along the surface. Section 108 of frequency selective surface 106 reflects low frequency signals such as component 14 of signal 10, but allows signals associated with higher frequencies to pass through to absorptive material 110. Section 112 of frequency selective surface 106 reflects frequency components such as frequency component 16 of signal 10 and allows other frequencies to pass into absorptive material 110.
- Section 114 of frequency selective surface 106 reflects high frequency signals such as signal components 18 of signal 10 and allows other signals to pass to absorptive material 110.
- the signals reflected by frequency selective surface 106 are reflected in the direction of frequency selective surface 116.
- Frequency selective surface 116 operates in a fashion similar to frequency selective surface 106. That is, section 118 of frequency selective surface 116 reflects lower frequency signals such as component 14 of signal 10, but allows the higher and mid-range frequency signals associated with components 16 and 18 to pass into absorptive material 120.
- Section 122 of frequency selective surface 116 reflects frequency component 16 of signal 10 but allows the other frequency components to pass through to absorptive material 120.
- Section 124 of frequency selective surface 116 reflects high frequency components such as components 18 of signal 10 while allowing the other components to pass through to absorptive material 120.
- the signals reflected by frequency selective surface 116 are reflected in the direction of received output antenna 126 which combines the reflected signals and provides an output signal on output 128.
- higher frequency signals travel a shorter path illustrated by the sum of lines 130, 132 and 134, while lower frequency signals travel a longer path illustrated by the sum of lines 136, 138 and 140. This results in the higher frequency signals traveling a shorter distance than the lower frequency signals.
- the shorter propagation path traveled by the higher frequency signals essentially compresses the multifrequency pulse that was provided at input 100.
- signals can be compressed or stretched by adjusting the distances traveled by different frequency components. These distances may be adjusted by changing the order of the sections on the graduated frequency selective surfaces.
- FIG. 5 illustrates a graduated frequency selective surface 160 that may be used in the delay device of FIG. 4.
- the frequency selective surface 160 comprises conductive materials 162 arranged on substrate 164.
- Conductive materials 162 may be constructed out of tin, copper, silver or aluminum while substrate 164 may be fabricated from materials such as fiberglass or KEVLAR type polyamide material sheets that are between, for example, 1 and 5 mils thick.
- Portion 166 of the graduated frequency selective surface 160 has a metal pattern that resonates or reflects low frequency signals such as signal component 14 of signal 10, but allows mid-range frequency and higher frequency signals to pass through.
- Section 168 of frequency selective surface 160 contains a metal pattern that is reflective to mid-range frequency signals such as signal component 16 of signal 10, but allows the other frequency components to pass.
- Section 170 of frequency selective surface 160 contains patterns that are reflective to high frequency signals such as component 18 of signal 10, but allows the lower frequency components to pass through.
Landscapes
- Aerials With Secondary Devices (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14087098A | 1998-08-27 | 1998-08-27 | |
| US140870 | 1998-08-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0982800A2 true EP0982800A2 (fr) | 2000-03-01 |
Family
ID=22493166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19990306458 Withdrawn EP0982800A2 (fr) | 1998-08-27 | 1999-08-17 | Dispositif de retard à hautes fréquences comportant des surfaces à sélection de fréquence |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0982800A2 (fr) |
| JP (1) | JP2000091836A (fr) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004018578A1 (fr) | 2002-07-31 | 2004-03-04 | Basf Coatings Ag | Materiau de revetement, procede de production et utilisation associes |
| JP2015053660A (ja) * | 2013-09-09 | 2015-03-19 | 日本電信電話株式会社 | アンテナ装置及び反射板配置方法 |
| US10797401B2 (en) | 2016-12-13 | 2020-10-06 | Mitsubishi Electric Corporation | Reflection mirror antenna device |
| WO2023029431A1 (fr) * | 2021-08-31 | 2023-03-09 | Commscope Technologies Llc | Antennes de station de base ayant au moins un réflecteur à grille et dispositifs associés |
| US11749881B2 (en) | 2020-03-24 | 2023-09-05 | Commscope Technologies Llc | Base station antennas having an active antenna module and related devices and methods |
| US11909121B2 (en) | 2020-03-24 | 2024-02-20 | Commscope Technologies Llc | Radiating elements having angled feed stalks and base station antennas including same |
| US12218425B2 (en) | 2020-04-28 | 2025-02-04 | Outdoor Wireless Networks LLC | Base station antennas having reflector assemblies including a nonmetallic substrate having a metallic layer thereon |
| US12438258B2 (en) | 2022-06-01 | 2025-10-07 | Outdoor Wireless Networks LLC | Base station antennas |
| US12469960B2 (en) | 2022-07-08 | 2025-11-11 | Outdoor Wireless Networks LLC | Base station antennas |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010137713A1 (fr) * | 2009-05-29 | 2010-12-02 | 株式会社エヌ・ティ・ティ・ドコモ | Reflectarray |
| JP5054174B2 (ja) * | 2010-08-26 | 2012-10-24 | 日本電業工作株式会社 | アンテナ |
| JP2014093544A (ja) * | 2012-10-31 | 2014-05-19 | Nippon Telegr & Teleph Corp <Ntt> | 反射板、アンテナ装置、そのビーム幅制御方法 |
-
1999
- 1999-08-17 EP EP19990306458 patent/EP0982800A2/fr not_active Withdrawn
- 1999-08-26 JP JP23908399A patent/JP2000091836A/ja active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004018578A1 (fr) | 2002-07-31 | 2004-03-04 | Basf Coatings Ag | Materiau de revetement, procede de production et utilisation associes |
| JP2015053660A (ja) * | 2013-09-09 | 2015-03-19 | 日本電信電話株式会社 | アンテナ装置及び反射板配置方法 |
| US10797401B2 (en) | 2016-12-13 | 2020-10-06 | Mitsubishi Electric Corporation | Reflection mirror antenna device |
| US12176604B2 (en) | 2020-03-24 | 2024-12-24 | Outdoor Wireless Networks LLC | Base station antennas having an active antenna module and related devices and methods |
| US12374783B2 (en) | 2020-03-24 | 2025-07-29 | Outdoor Wireless Networks LLC | Base station antennas having an active antenna module and related devices and methods |
| US11749881B2 (en) | 2020-03-24 | 2023-09-05 | Commscope Technologies Llc | Base station antennas having an active antenna module and related devices and methods |
| US11909121B2 (en) | 2020-03-24 | 2024-02-20 | Commscope Technologies Llc | Radiating elements having angled feed stalks and base station antennas including same |
| US12119545B2 (en) | 2020-03-24 | 2024-10-15 | Outdoor Wireless Networks LLC | Base station antennas having an active antenna module and related devices and methods |
| US12218425B2 (en) | 2020-04-28 | 2025-02-04 | Outdoor Wireless Networks LLC | Base station antennas having reflector assemblies including a nonmetallic substrate having a metallic layer thereon |
| CN116261813A (zh) * | 2021-08-31 | 2023-06-13 | 康普技术有限责任公司 | 具有至少一个网格反射器和相关装置的基站天线 |
| US12362461B2 (en) | 2021-08-31 | 2025-07-15 | Outdoor Wireless Networks LLC | Base station antennas having at least one grid reflector and related devices |
| WO2023029431A1 (fr) * | 2021-08-31 | 2023-03-09 | Commscope Technologies Llc | Antennes de station de base ayant au moins un réflecteur à grille et dispositifs associés |
| US12438258B2 (en) | 2022-06-01 | 2025-10-07 | Outdoor Wireless Networks LLC | Base station antennas |
| US12469960B2 (en) | 2022-07-08 | 2025-11-11 | Outdoor Wireless Networks LLC | Base station antennas |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000091836A (ja) | 2000-03-31 |
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