EP0209220A1 - Dual end resonant slot array antenna feed - Google Patents
Dual end resonant slot array antenna feed Download PDFInfo
- Publication number
- EP0209220A1 EP0209220A1 EP86303580A EP86303580A EP0209220A1 EP 0209220 A1 EP0209220 A1 EP 0209220A1 EP 86303580 A EP86303580 A EP 86303580A EP 86303580 A EP86303580 A EP 86303580A EP 0209220 A1 EP0209220 A1 EP 0209220A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- slots
- plane
- tee junction
- slotted
- 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.)
- Granted
Links
- 230000009977 dual effect Effects 0.000 title claims abstract description 17
- 230000008878 coupling Effects 0.000 claims abstract description 3
- 238000010168 coupling process Methods 0.000 claims abstract description 3
- 238000005859 coupling reaction Methods 0.000 claims abstract description 3
- 230000005855 radiation Effects 0.000 description 7
- 238000003491 array Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0037—Particular feeding systems linear waveguide fed arrays
- H01Q21/0043—Slotted waveguides
Definitions
- This invention relates to slotted array antennas and more paricularly to a dual end resonant slot array feed for a resonant slotted waveguide planar array antenna.
- slotted array antennae have been fed by single end feed mechanisms.
- a waveguide section is fed at one end a waveguide short at the opposite end sets up a standing wave in the waveguide.
- Shunt or series slot elements are located at appropriate points on the standing wave pattern (voltage or current peaks, respectively) to cause radiation with the correct amplitude and phase.
- the standing wave pattern in the waveguide varies relative to the location of the slots, causing errors in the slot amplitudes and phases.
- the magnitude of these errors increases in a direct relationship to the deviation of frequency from the design center frequency.
- the magnitude of the errors also increases with the length of the waveguide, and hence the number of slots.
- the usable bandwidth of a single end feed is on the order of ⁇ 1 percent.
- E-plane and H-plane tee feeds have been used.
- the E-plane tee feed is in essence, two single end feeds joined at their respective feed points by an E-plane waveguide tee; improvement is caused by reducing the length (and number of slots) associated with each of the two single end feeds.
- the problem with the E-plane feed is that in order to maintain equal slot spacing one slot must lie directly under the E-plane tee. Owing to mutual coupling to the E-plane tee, this slot suffers a variation in phase and amplitude over the frequency band which differs significantly from the other slots in the array. This significantly different set of phase/amplitude errors for the slot under the E-plane feed largely offsets any bandwidth advantages that otherwise would have been obtained by using the E-plane tee.
- the feed point for the slot waveguide can be located half way between two slots instead of directly over the slots. Nevertheless, as the H-plane feed must be about one-half wavelength wide (to avoid waveguide cutoff effects), the feed then couples to the two slots adjacent to the feed, yielding essential the same bandwidth limitations as the E-plane feed.
- the bandwidth typically has been limited to less than 2.5% using one of the above methods owing to the need to keep the manifold complexity within reasonable bounds.
- Both the amplitude and phase of the aperture illumination begin to be significantly degraded at + 1 % of the center frequency.
- the single end feed for a resonant waveguide array is described in a number of texts on antennas. Those persons skilled in the art desiring more detailed information pertaining to single end feeds are referred to Johnson and Jasik's "Antenna Engineering Handbook, Second Edition, 1984 & 1961, Chapter 9.
- the invention comprises a dual end resonant slot array feed applicable to either a series slot feed or a shunt slot feed.
- a resonant waveguide section that contains either shunt or series slots spaced one-half guide wavelength is fed or excited from both ends.
- a planar slotted array antenna 10 comprises a polarizer 12, a longitudinal shunt slotted plate 14, a rotational series slotted plate 16, and manifold 18.
- the series waveguide excites a row of series slots 17 which couple RF power into the shunt waveguides. (The series waveguides are not visable in this Figure, as they are located on the back side of 16.)
- the shunt waveguide excites the shunt slots, which are the radiating elements. All of the slots are spaced one half waveguide wavelength ( ⁇ g /2) from the adjacent slots fed by the same guide.
- FIG. 2a One form of a prior-art waveguide feed system for the series slots is shwon in Figure 2a.
- Each of the series slot waveguides 24 is fed at one end by a fed manifold 18.
- a waveguide short-circuiting wall 23 at the opposite end of the waveguide sets up the standing wave needed for proper excitation of the series slots.
- variable phase shifters 22 may be added to electronically scan the antenna's radiation pattern.
- the series slots are fed as shown in Figure 2b.
- an E-plane waveguide tee 100 divides RF energy between two series slot waveguides 102 and 104, through E-plane tees 114 and 116.
- Waveguide shorts 106 at the outer ends of waveguides 102 and 104 set up the appropriate standing waves so that the series slots 108, 110, 112 etc., couple energy to the front face of the antenna.
- the waveguide short 106 must be one-half wavelength from the end slot in the waveguide, as shown.
- Slots 110 and 112 being located directly under the E-plane tees 114 and 116, respectively, exhibit direct coupling effects to the tee, which results in phase and amplitude errors for these slots. These slots thus become another bandwidth limiting element in the antenna.
- the dual end series slot feed 26 includes a tee junction which may be either an E-plane tee junction 28 (Fig. 3a) or an H-plane tee junction 30 (Fig. 3b), two waveguide sections 32 and 34, and two E-plane waveguide bends 36 and 38.
- the two waveguide section 32 and 34 and the E-plane bends are formed by a septum 40.
- the septum 40 is placed across waveguide 42 to separate all (n) slots 44 from the tee junction.
- the two E-plane waveguide bends 36 and 38 are formed by the space between ends 46 and 48 of the septum 40 and the ends of the waveguide 42 which space interconnects the two waveguide sections 32 and 34.
- the thickness of the septum 40 is much less than the wavelength in order to minimize the antenna thickness.
- the total length of the waveguide loop is approximately equal to n ⁇ g .
- the series resistances of the slots 44 are selected to present an impedance that is matched of the imput waveguide 50.
- the improved performance of the dual end feed is demonstrated by theoretical analysis of a waveguide with 8 series slots using ideal H-plane tee junction and E-plane waveguide bends.
- the slots are identical and their normalized resistances are equal to 0.25.
- the radiation current distribution compared to the ideal current is shown in Figures 5a and 5b, and are computed for ⁇ 1.8% off the center frequency.
- the set of symmetrical curves are computed for the tee junction at the center while the unsymmetrical results are computed for the tee junction at a half guide wavelength off from the center. It is to be noted that the radiation current amplitude and phase variations are only 0.16 dB and 9.5 degrees, respectively, for the symmetrical feed over a 3.6% bandwidth. These variations in radiation current distribution increases to 0.44 dB and 13 degrees when the tee junction is offset by ⁇ g /2.
- a dual end series slot feed was fabricated using the E-plane waveguide bend of Figure 4a and the H-plane tee junction of Figure 4b.
- a 16.5 GHz center frequency waveguide section with 5 unequal slots was employed.
- the dimensions of the waveguide 42 (Fig. 4a) were 0.496" by 0.155".
- the thickness (t) of the septum 40 was 0.032", and the space "W” was 0.177".
- the input 50 was 0.496" wide, with a tuning stub 0.025" high and a 0.138" diameter positioned 0.637" from the end of waveguide section 32.
- Waveguide section 32 has a width of 0.496" and a T shaped matching vane 54 centered with respect to the input 50.
- the T has a length of 0.222" and a thickness of 0.030". Tests showed that the VSWR of the E-plane waveguide bends is less that 1.10 over a 6% bandwidth, and the input VSWR of the H-plane tee junction is less than 1.18 over the same bandwidth.
- the measured output voltage amplitude and phase from the slots are shown in Figures 6a and 6b.
- the slot output voltages are measured from a set of identical waveguides in which the RF power is coupled through the series slots.
- Two dual end slot array feeds 42 (Fig. 7) having different number of slots 44 in their arrays of slots n1 and n2 (where n1 > n2) can have their tee junctions 50 connected to waveguide sections 56 and 58.
- Waveguide sections 56 and 58 are connected to a power divider 60 of manifold 18.
- a waveguide length equal to (n1-n2) ⁇ g /2 is required to be connected to the tee junction input of the array with n2 slots.
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
- This invention relates to slotted array antennas and more paricularly to a dual end resonant slot array feed for a resonant slotted waveguide planar array antenna.
- In the past slotted array antennae have been fed by single end feed mechanisms. When a waveguide section is fed at one end a waveguide short at the opposite end sets up a standing wave in the waveguide. Shunt or series slot elements are located at appropriate points on the standing wave pattern (voltage or current peaks, respectively) to cause radiation with the correct amplitude and phase. Over a band of frequencies, the standing wave pattern in the waveguide varies relative to the location of the slots, causing errors in the slot amplitudes and phases. The magnitude of these errors increases in a direct relationship to the deviation of frequency from the design center frequency. The magnitude of the errors also increases with the length of the waveguide, and hence the number of slots. For waveguides having four or more slots, the usable bandwidth of a single end feed is on the order of ± 1 percent.
- To improve the bandwidth relative to a single end feed, E-plane and H-plane tee feeds have been used. The E-plane tee feed is in essence, two single end feeds joined at their respective feed points by an E-plane waveguide tee; improvement is caused by reducing the length (and number of slots) associated with each of the two single end feeds. The problem with the E-plane feed is that in order to maintain equal slot spacing one slot must lie directly under the E-plane tee. Owing to mutual coupling to the E-plane tee, this slot suffers a variation in phase and amplitude over the frequency band which differs significantly from the other slots in the array. This significantly different set of phase/amplitude errors for the slot under the E-plane feed largely offsets any bandwidth advantages that otherwise would have been obtained by using the E-plane tee.
- By substituting an H-plane (shunt) tee for the E-plane (series) tee, the feed point for the slot waveguide can be located half way between two slots instead of directly over the slots. Nevertheless, as the H-plane feed must be about one-half wavelength wide (to avoid waveguide cutoff effects), the feed then couples to the two slots adjacent to the feed, yielding essential the same bandwidth limitations as the E-plane feed.
- For a large array antenna, the bandwidth typically has been limited to less than 2.5% using one of the above methods owing to the need to keep the manifold complexity within reasonable bounds. Both the amplitude and phase of the aperture illumination begin to be significantly degraded at + 1 % of the center frequency. The single end feed for a resonant waveguide array is described in a number of texts on antennas. Those persons skilled in the art desiring more detailed information pertaining to single end feeds are referred to Johnson and Jasik's "Antenna Engineering Handbook, Second Edition, 1984 & 1961,
Chapter 9. - Accordingly, it is an object of this invention to provide a slotted array antenna having substantially increased frequency bandwidth.
- Another object of the invention is to provide a feed for improving substantially the bandwidth performance of the slot array over that obtained using a single end feed. Yet another object of the invention is to improve substantially the amplitude and phase accuracy of the aperture illumination of the slot array antenna.
- Briefly stated the invention comprises a dual end resonant slot array feed applicable to either a series slot feed or a shunt slot feed. A resonant waveguide section that contains either shunt or series slots spaced one-half guide wavelength is fed or excited from both ends.
- Other objects and features of the invention will become more readily apparent from the following detailed description when read in conjunction with the accompanying drawings in which:
- Figure 1 is an exploded view of a slot antenna array;
- Figures 2a and 2b are prior art realizations of slotted waveguide antennas;
- Figures 3a and 3b are views of dual end series slot feed using, respectively, E-plane tee feed and H-plane tee feed;
- Figures 4a and 4b are, respectively, a side view of the E-plane waveguide bend and a top view of the matched H-plane tee junction;
- Figures 5a and 5b are charts, respectively, of the radiation current amplitude distribution for an 8 slot waveguide section using the invention, and of the radiation current phase distribution for an 8 slot waveguide section using the invention; and
- Figures 6a and 6b are charts, respectively, of measured slot output voltage amplitude and slot output voltage phase (degrees) compared to
slot 3 of a 5 slot array. - Figure 7 is a view showing the combination of two dual end series slot feeds.
- Referring now to Figure 1, a planar
slotted array antenna 10 comprises apolarizer 12, a longitudinal shunt slottedplate 14, a rotational series slottedplate 16, andmanifold 18. The series waveguide excites a row ofseries slots 17 which couple RF power into the shunt waveguides. (The series waveguides are not visable in this Figure, as they are located on the back side of 16.) The shunt waveguide excites the shunt slots, which are the radiating elements. All of the slots are spaced one half waveguide wavelength (λg/2) from the adjacent slots fed by the same guide. - One form of a prior-art waveguide feed system for the series slots is shwon in Figure 2a. Each of the
series slot waveguides 24 is fed at one end by afed manifold 18. A waveguide short-circuiting wall 23 at the opposite end of the waveguide sets up the standing wave needed for proper excitation of the series slots. In certain applications,variable phase shifters 22 may be added to electronically scan the antenna's radiation pattern. - In another form of the prior art, the series slots are fed as shown in Figure 2b. Here an E-plane
waveguide tee 100 divides RF energy between twoseries slot waveguides E-plane tees 114 and 116. Waveguideshorts 106 at the outer ends ofwaveguides series slots - Similar λ/2 waveguide shorts are needed at the opposite ends of both
waveguides -
Slots E-plane tees 114 and 116, respectively, exhibit direct coupling effects to the tee, which results in phase and amplitude errors for these slots. These slots thus become another bandwidth limiting element in the antenna. - Referring now to Figures 3a and 3b, the dual end
series slot feed 26 includes a tee junction which may be either an E-plane tee junction 28 (Fig. 3a) or an H-plane tee junction 30 (Fig. 3b), twowaveguide sections E-plane waveguide bends waveguide section septum 40. Theseptum 40 is placed acrosswaveguide 42 to separate all (n)slots 44 from the tee junction. The twoE-plane waveguide bends ends septum 40 and the ends of thewaveguide 42 which space interconnects the twowaveguide sections septum 40 is much less than the wavelength in order to minimize the antenna thickness. The total length of the waveguide loop is approximately equal to nλg. The series resistances of theslots 44 are selected to present an impedance that is matched of theimput waveguide 50. - It will be appreciated from the foregoing description that a typical design of the dual end slot array feed is based on the following rules:
- 1. The H-plane or E-plane tee is separated from the slots by a septum. The E-plane tee (Fig. 3a) is located on the top of a series slot white the H-plane tee is located at the middle of two series slots (Fig. 3b).
- 2. The sum of the normalized resonant slot resistances of all n series slots in one unit is equal to 2.
- 3. The waveguide loop length is approximately equal to nλg.
- 4. Between two arrays of n₁ and n₂ series slots where n₁ > n₂ a waveguide length equal to (n₁-n2) λg/2 is required to be connected to the tee junction input of the array with n₂ slots.
- 5. H-plane or E-plane tee junctions shall not be offset by more than ± 0.01%λg.
- The improved performance of the dual end feed is demonstrated by theoretical analysis of a waveguide with 8 series slots using ideal H-plane tee junction and E-plane waveguide bends. The slots are identical and their normalized resistances are equal to 0.25. The radiation current distribution compared to the ideal current is shown in Figures 5a and 5b, and are computed for ± 1.8% off the center frequency. The set of symmetrical curves are computed for the tee junction at the center while the unsymmetrical results are computed for the tee junction at a half guide wavelength off from the center. It is to be noted that the radiation current amplitude and phase variations are only 0.16 dB and 9.5 degrees, respectively, for the symmetrical feed over a 3.6% bandwidth. These variations in radiation current distribution increases to 0.44 dB and 13 degrees when the tee junction is offset by λg/2.
-
- A dual end series slot feed was fabricated using the E-plane waveguide bend of Figure 4a and the H-plane tee junction of Figure 4b. A 16.5 GHz center frequency waveguide section with 5 unequal slots was employed. The dimensions of the waveguide 42 (Fig. 4a) were 0.496" by 0.155". For the E-plane waveguide bend, the thickness (t) of the
septum 40 was 0.032", and the space "W" was 0.177". For the H-plane tee junction (Fig. 4b) theinput 50 was 0.496" wide, with a tuning stub 0.025" high and a 0.138" diameter positioned 0.637" from the end ofwaveguide section 32.Waveguide section 32 has a width of 0.496" and a T shaped matchingvane 54 centered with respect to theinput 50. The T has a length of 0.222" and a thickness of 0.030". Tests showed that the VSWR of the E-plane waveguide bends is less that 1.10 over a 6% bandwidth, and the input VSWR of the H-plane tee junction is less than 1.18 over the same bandwidth. - The measured output voltage amplitude and phase from the slots are shown in Figures 6a and 6b. The slot output voltages are measured from a set of identical waveguides in which the RF power is coupled through the series slots.
- It will be noted from Figure 6a that the measured voltage amplitudes are consistently evenly distributed over a wide bandwidth. The length of
slot 2 is slightly too short (owing to fabrication errors) such that the amplitude falls off at the low frequency. The phase plot (Fig. 6b) was obtained by normalizing to the phase ofslot 3, i.e., the phase ofslot 3 = 0. All the phases track very well except the first slot. However, the largest discrepancy (at 16.0 GHz) over a 6 % bandwidth is only 17 degrees. - Two dual end slot array feeds 42 (Fig. 7) having different number of
slots 44 in their arrays of slots n1 and n2 (where n1 > n2) can have theirtee junctions 50 connected to waveguidesections Waveguide sections power divider 60 ofmanifold 18. Between the two arrays of n1 and n2 series slots where n1>n2, a waveguide length equal to (n1-n2) λg/2 is required to be connected to the tee junction input of the array with n2 slots. - Although only a single embodiment of the invention has been described, it will be apparent to a person skilled in the art that various modifications to the details of construction shown and described may be made without departing from the scope of this invention. For example, while most of the descriptions have addressed the feeding of series slot elements in the broad wall of a rectangular waveguide, the method is equally applicable to both shunt and series slots in waveguides of arbitray cross-section.
- Also, it will be understood by those skilled in the art that this antenna will operate reciprocally, having the same characteristics whether transmitting or receiving, despite the fact that the antenna has been described above primarily as a transmitting antenna. What is claimed is:
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US73600985A | 1985-05-20 | 1985-05-20 | |
US736009 | 1985-05-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0209220A1 true EP0209220A1 (en) | 1987-01-21 |
EP0209220B1 EP0209220B1 (en) | 1993-09-15 |
Family
ID=24958123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86303580A Expired - Lifetime EP0209220B1 (en) | 1985-05-20 | 1986-05-12 | Dual end resonant slot array antenna feed |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0209220B1 (en) |
JP (1) | JP2612849B2 (en) |
DE (1) | DE3689015T2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2238914A (en) * | 1989-11-27 | 1991-06-12 | Matsushita Electric Works Ltd | Waveguide feeding array antenna |
WO1999000871A1 (en) * | 1997-06-30 | 1999-01-07 | Raytheon Company | Antenna feed architecture for use with a continuous transverse stub antenna array |
WO1999007033A1 (en) * | 1997-07-31 | 1999-02-11 | Ems Technologies, Inc. | Dual polarized slotted array antenna |
EP2093835A1 (en) * | 2006-12-01 | 2009-08-26 | Mitsubishi Electric Corporation | Coaxial line slot array antenna and method for manufacturing the same |
CN106356642A (en) * | 2016-10-27 | 2017-01-25 | 成都雷电微力科技有限公司 | Medium waveguide crack array antenna with series feed of metal hollow waveguide |
CN112072256A (en) * | 2020-09-23 | 2020-12-11 | 河北东森电子科技有限公司 | Power synthesis network based on waveguide coupling gap |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5513176A (en) * | 1990-12-07 | 1996-04-30 | Qualcomm Incorporated | Dual distributed antenna system |
WO1999056346A1 (en) * | 1998-04-27 | 1999-11-04 | Mitsubishi Denki Kabushiki Kaisha | Slot array antenna |
DE10150086B4 (en) * | 2001-10-14 | 2013-12-12 | Uhland Goebel | Group antenna with a regular array of breakthroughs |
JP4709601B2 (en) * | 2005-07-19 | 2011-06-22 | 日本無線株式会社 | Waveguide slot array antenna |
JP4689493B2 (en) * | 2006-02-22 | 2011-05-25 | 三菱電機株式会社 | Array antenna |
JP4937273B2 (en) * | 2006-12-01 | 2012-05-23 | 三菱電機株式会社 | Coaxial line slot array antenna and manufacturing method thereof |
JP4888143B2 (en) * | 2007-02-05 | 2012-02-29 | 三菱電機株式会社 | T-branch waveguide and array antenna |
JP5424954B2 (en) * | 2010-03-29 | 2014-02-26 | 三菱電機株式会社 | Waveguide slot array antenna |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2628311A (en) * | 1948-11-04 | 1953-02-10 | Rca Corp | Multiple slot antenna |
US2981948A (en) * | 1956-05-29 | 1961-04-25 | Hughes Aircraft Co | Simultaneous lobing array antenna system |
US3293647A (en) * | 1962-03-19 | 1966-12-20 | Marconi Co Ltd | Doppler antenna array with feed switching |
US3657668A (en) * | 1969-06-06 | 1972-04-18 | Int Standard Electric Corp | Hybrid t-junction constructed in waveguide having a cut-off frequency above the operating frequency |
US4121220A (en) * | 1975-01-31 | 1978-10-17 | Electronique Marcel Dassault | Flat radar antenna employing circular array of slotted waveguides |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB813934A (en) * | 1956-09-26 | 1959-05-27 | Marconi Wireless Telegraph Co | Improvements in or relating to aerial systems |
JPS5194743A (en) * | 1975-02-17 | 1976-08-19 | ||
JPS5932205A (en) * | 1982-08-14 | 1984-02-21 | Nippon Hoso Kyokai <Nhk> | Radial waveguide line |
-
1986
- 1986-05-12 EP EP86303580A patent/EP0209220B1/en not_active Expired - Lifetime
- 1986-05-12 DE DE19863689015 patent/DE3689015T2/en not_active Expired - Fee Related
- 1986-05-19 JP JP61114473A patent/JP2612849B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2628311A (en) * | 1948-11-04 | 1953-02-10 | Rca Corp | Multiple slot antenna |
US2981948A (en) * | 1956-05-29 | 1961-04-25 | Hughes Aircraft Co | Simultaneous lobing array antenna system |
US3293647A (en) * | 1962-03-19 | 1966-12-20 | Marconi Co Ltd | Doppler antenna array with feed switching |
US3657668A (en) * | 1969-06-06 | 1972-04-18 | Int Standard Electric Corp | Hybrid t-junction constructed in waveguide having a cut-off frequency above the operating frequency |
US4121220A (en) * | 1975-01-31 | 1978-10-17 | Electronique Marcel Dassault | Flat radar antenna employing circular array of slotted waveguides |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 119 (E-248)[1556], 5th June 1984; & JP - A - 59 32205 (NIPPON HOSO KYOKAI) 21-02-1984 * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2238914A (en) * | 1989-11-27 | 1991-06-12 | Matsushita Electric Works Ltd | Waveguide feeding array antenna |
GB2238914B (en) * | 1989-11-27 | 1994-05-04 | Matsushita Electric Works Ltd | Waveguide feeding array antenna |
WO1999000871A1 (en) * | 1997-06-30 | 1999-01-07 | Raytheon Company | Antenna feed architecture for use with a continuous transverse stub antenna array |
WO1999007033A1 (en) * | 1997-07-31 | 1999-02-11 | Ems Technologies, Inc. | Dual polarized slotted array antenna |
EP2093835A1 (en) * | 2006-12-01 | 2009-08-26 | Mitsubishi Electric Corporation | Coaxial line slot array antenna and method for manufacturing the same |
US8134514B2 (en) | 2006-12-01 | 2012-03-13 | Mitsubishi Electric Corporation | Coaxial line slot array antenna and method for manufacturing the same |
EP2093835A4 (en) * | 2006-12-01 | 2014-03-05 | Mitsubishi Electric Corp | Coaxial line slot array antenna and method for manufacturing the same |
CN106356642A (en) * | 2016-10-27 | 2017-01-25 | 成都雷电微力科技有限公司 | Medium waveguide crack array antenna with series feed of metal hollow waveguide |
CN106356642B (en) * | 2016-10-27 | 2023-06-13 | 成都雷电微力科技股份有限公司 | Dielectric waveguide split array antenna with metal hollow waveguide series feed |
CN112072256A (en) * | 2020-09-23 | 2020-12-11 | 河北东森电子科技有限公司 | Power synthesis network based on waveguide coupling gap |
Also Published As
Publication number | Publication date |
---|---|
DE3689015D1 (en) | 1993-10-21 |
JP2612849B2 (en) | 1997-05-21 |
JPS6230409A (en) | 1987-02-09 |
EP0209220B1 (en) | 1993-09-15 |
DE3689015T2 (en) | 1994-02-17 |
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Legal Events
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