Low visibility, fixed-tune, wide band and field-diverse antenna with dual polarization
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01Q-001/00
H01Q-001/36
출원번호
UP-0434101
(2006-05-15)
등록번호
US-7639204
(2010-01-07)
발명자
/ 주소
Chau, Tam Hung
출원인 / 주소
Antenex, Inc.
대리인 / 주소
Harness, Dickey & Pierce, P.L.C.
인용정보
피인용 횟수 :
1인용 특허 :
20
초록▼
A low-visibility, fixed-tune, wideband, and field-diverse antenna provides cross-polarized fields enhancing signal communications but having helical antenna characteristics without severe circular polarization radiation thereby promoting a modern, futuristic, and disguised look for reliable communic
A low-visibility, fixed-tune, wideband, and field-diverse antenna provides cross-polarized fields enhancing signal communications but having helical antenna characteristics without severe circular polarization radiation thereby promoting a modern, futuristic, and disguised look for reliable communications. A generally flat, but helical, antenna is achieved in conjunction with a core substrate about which the antenna is wrapped, wound, or fixed. The core substrate, pitch or angle of the helix, length of the transmitting antenna, and copper traces thickness are chosen for a specific resonant frequency range. The length and width of the helix are chosen in order to dimension the helical antenna between its linear and circular polarization modes to thereby deliver field-diverse and cross-polarized transmission modes. In order to optimize the manufacturing process, holes may be created within the substrate. These holes are plated with conducting material so that conducting foil on opposite faces of the substrate may be electrically connected. The holes may be offset according to the pitch of the helix. Once the transmitting antenna has been fabricated upon the core substrate, the margin between the plated-through holes and the edge of the substrate may be separated by cutting, sawing, or stamping.
대표청구항▼
What is claimed is: 1. A low-visibility, wideband, and field-diverse antenna that is fixed-tune comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines, said
What is claimed is: 1. A low-visibility, wideband, and field-diverse antenna that is fixed-tune comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines, said shunt capacitor comprising a 5.0 pF at 1 kV ceramic capacitor for selectably matching a frequency range of approximately 450-470 MHz; and a third transmission line coupled to said second transmission line. 2. A low-visibility, wideband, and field-diverse antenna that is fixed-tune comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines, said shunt capacitor comprising a 1.5 pF at 1.0 kV shunt ceramic capacitor for selectably matching frequency ranges of approximately 806-866, 821-896, and 824-896 MHz; and a third transmission line coupled to said second transmission line. 3. A low-visibility, wideband, and field-diverse antenna that is fixed-tune comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines, said shunt capacitor comprising a 1.0 pF at 1.0 kV shunt ceramic capacitor for selectably matching a frequency range of approximately 890-960 MHz or a frequency range of approximately 902-928 MHz; and a third transmission line coupled to said second transmission line. 4. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; said first, second and third transmission lines provide an inductance in the range of 19-26 nH; said second transmission line is a micro-strip line having a length that is pre-selected for a resonant frequency; and said third transmission line is a micro-strip line having a thickness that is pre-selected. 5. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; and an antenna core, said antenna core supporting said first, second, and third transmission lines. 6. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 5, further comprising: said first, second, and third transmission lines being conductive traces. 7. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 6, wherein said conductive traces include copper. 8. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 5, wherein said antenna core further comprises a printed circuit board (PCB) substrate. 9. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 5, further comprising: said antenna core conducts from one flat side to another via at least a portion of a plated-through hole. 10. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 5, wherein the shunt capacitor includes a capacitor coupled to said first and second transmission lines, and wherein the second transmission line is disposed between the first and third transmission lines without an inductor component between the first and third transmission lines. 11. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said first, second and third transmission lines are operable for providing an inductance in the range of 19 nanoHenries (nH) to 26 nH for the frequency ranges of 806-866, 821-896, and 890-960 Megahertz. 12. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said first, second, and third transmission lines comprise micro-strip lines on a printed circuit board. 13. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein the low-visibility, wideband, and field-diverse antenna is fixed-tune, thereby enabling reliable transmission and reception characteristics in a repeatably manufacturable manner. 14. A low-visibility, wideband, and field-diverse antenna comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; an antenna-supporting core; and an antenna coupled to at least one or more of said shunt capacitor and said first, second, and third transmission lines, said antenna having a continuously conducting path continuous conductively wrapped upon said core in a manner for a selected resonant frequency, said antenna radiating in a diverse manner with horizontal and vertical field components of a field radiated by said antenna substantially in phase and not circularly polarized. 15. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 14, wherein the low-visibility, fixed-tune, wideband field-diverse antenna is configured having helical antenna characteristics without severe circular polarization radiation thereby promoting ease of repeated antenna manufacture for reliable communications. 16. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 14, further comprising a radome covering said core and said antenna and operable for changing the operating frequency of the antenna. 17. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 16, wherein said radome comprises a material having a dielectric constant of approximately 4. 18. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 16, wherein: said antenna core has a flat shape and fits within said radome; and said radome is thin with a height of approximately three inches tall, whereby said radome helps and promotes disguise of said radome as said radome is smaller and less intruding while said antenna covered by said radome provides good operation. 19. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 16, wherein: said radome is approximately three and one-half inches tall; and said shunt capacitor comprises a shunt ceramic capacitor of approximately 5.0 pF at approximately 1 kV at a selected length for a center frequency of approximately 460 MHz with a bandwidth of approximately 20 MHz with a VSWR of approximately 2.0:1. 20. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 16, wherein: said radome is approximately two and three-quarter inches (2 ¾") tall; said shunt capacitor comprises a shunt ceramic capacitor of approximately 1.5 pF at approximately 1 kV; and said antenna having a bandwidth of approximately 60 MHz for at least one of the duplexed radio bands at approximately 806-869 MHz, approximately 824-896 MHz, and approximately 890-960 MHz. 21. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 14, wherein the antenna includes a meandering conductive printed circuit trace and a wide conducting radiator at a top of said antenna core coupled to the meandering conductive printed circuit trace for a specific frequency, whereby the antenna is operable for providing a wide frequency bandwidth. 22. A low-visibility, wideband, and field-diverse antenna that is fixed-tune as set forth in claim 14, wherein: said antenna core comprises a non-metallic material substrate that is generally flat and thin having a thickness of approximately 0.062" thick; and said antenna comprises continuous conductive wrapping meandering upon said antenna core to provide an antenna for a specific resonant frequency. 23. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said antenna does not include any resistors or inductors disposed between said shunt capacitor and said first, second, and third transmission lines. 24. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said antenna include only a single one of said shunt capacitor. 25. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said antenna is configured to transmit signals using dual polarization to obtain field diversity. 26. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said shunt capacitor is a ceramic capacitor of 5.0 pF at 1 kV for matching a selected frequency band of about 450-470 MHz, or said shunt capacitor is a ceramic capacitor ranging from 1.0 pF to 1.5 pF at 1.0 kV for matching a selected frequency band of about 806-960 MHz. 27. A low-visibility, wideband, and field-diverse antenna that is fixed-tune, comprising: a first transmission line coupled to an input; a second transmission line coupled to said first transmission line; a shunt capacitor coupled to said first and second transmission lines; a third transmission line coupled to said second transmission line; wherein said shunt capacitor is capable of changing capacitance to accommodate selected resonance frequencies coupled to said first and second transmission lines.
Cline Edward A. (Algonquin IL) Gorenz ; Jr. Harold J. (Lisle IL) Hood ; III Charles D. (Elmhurst IL) Harden Daniel K. (Palo Alto CA) Friesen Mark B. (Palo Alto CA) Schulz Gary D. (Cary IL), Antenna for portable communicator/computer.
Gomez Francisco X. ; Mockus Joseph F. ; Gong Peng, Multi-band, multiple purpose antenna particularly useful for operation in cellular and global positioning system modes.
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