Omnidirectional edge fed transmission line antenna

• US 5,483,246 A
• Filed: 10/03/1994
• Issued: 01/09/1996
• Est. Priority Date: 10/03/1994
• Status: Expired due to Term

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Barnett, Kenneth C., Ponce de Leon, Lorenzo A., McMurray, Charles R., Halabi, Nadim M.
• Primary Examiner(s): Hajec, Donald T.
• Assistant Examiner(s): PHAN, THO GIA
• Application Number:
  US08/317,057
• Time in Patent Office: 463 Days
• Field of Search: 343/700 MS, 343/702, 343/749, 343/829, 343/830, 343/845, 343/846, 343/847, 343/848
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 13/206 Microstrip transmission line antennas

Abstract

An omnidirectional antenna (100) includes a resonator (102) and a ground plane (104). The resonator (102) includes a dielectric substrate (402) having a top conductive plate (404) and a bottom conductive plate (406), wherein the top conductive plate (404) is shorted to the bottom conductive plate (406) proximal to a first end (436) and open at a second end (438) of the dielectric substrate (402), a resonator feed (416) having a location between the first (436) and second (438) ends, a first resonator ground (424) and a second resonator ground (408) coupled between the bottom conductive plate (406) and the ground plane (104), the first resonator ground (424) being contiguous to the bottom conductive plate (406) and having a location which is distal to the first end (436) for suppressing undesirable resonator resonance, and the second resonator ground (408) being contiguous to the bottom conductive plate (406) and having a location which is proximal to the first end (436) for controlling a radiation pattern of the resonator (102) to produce a substantially omnidirectional antenna beam pattern.

Claims

1. An omnidirectional antenna, comprising:

a ground plane; and

a resonator, comprising

a dielectric substrate having a top conductive plate and a bottom conductive plate, wherein said top conductive plate is shorted to said bottom conductive plate at a first end of said dielectric substrate and open at a second end of said dielectric substrate,

a resonator feed, having a location between said first and second ends of said dielectric substrate,

a first resonator ground being connected to said bottom conductive plate and having a location which is distal to said first end of said dielectric substrate, and

a second resonator ground being connected to said top conductive plate and to said bottom conductive plate and having a location which is proximal to said first end of said dielectric substrate,

wherein said first resonator ground being connected to said ground plane for suppressing undesirable resonator resonance, and said second resonator ground being connected to said ground plane for controlling a radiation pattern of said resonator to produce a substantially omnidirectional antenna beam pattern.

2. The omnidirectional antenna according to claim 1 wherein said top conductive plate and said bottom conductive plate have a predetermined length and width, and wherein said length is substantially greater than said width.

3. The omnidirectional antenna according to claim 2 wherein the omnidirectional antenna has a predetermined operating frequency, and wherein said predetermined length of said top conductive plate is equal to or greater than one-quarter wavelength at the predetermined operating frequency.

4. The omnidirectional antenna according to claim 1 wherein said resonator feed presents an impedance which is a function of said location of said resonator feed relative to said first end of said dielectric substrate.

5. The omnidirectional antenna according to claim 1 wherein said resonator feed presents a short circuit to minimize static charge buildup.

6. The omnidirectional antenna according to claim 1 wherein said undesirable resonator resonance is suppressed in relation to said location of said first resonator ground relative to said first end of said dielectric substrate.

7. The omnidirectional antenna according to claim 1 wherein said radiation pattern is controlled as a function of said location of said second resonator ground relative to said first end of said dielectric substrate.

8. The omnidirectional antenna according to claim 1 wherein said ground plane provides a ground potential for a receiver coupled to said resonator feed.

9. The omnidirectional antenna according to claim 1, wherein said resonator further comprises a plurality of sockets to provide connection between said resonator and said ground plane.

10. An omnidirectional antenna for a receiving device, comprising:

a substrate having a first metallization layer for connecting components for a receiver, and at least a second metallization layer for establishing a receiver ground plane; and

a resonator, comprising

a dielectric substrate having a top conductive plate and a bottom conductive plate, wherein said top conductive plate is shorted to said bottom conductive plate at a first end of said dielectric substrate and open at a second end of said dielectric substrate,

a resonator feed coupled to said receiver and having a location between said first and second ends of said dielectric substrate, for providing an intercepted signal to said receiver,

a first resonator ground being connected to said bottom conductive plate and having a location which is distal to said first end of said dielectric substrate, and

a second resonator ground being connected to said top conductive plate and to said bottom conductive plate and having a location which is proximal to said first end of said dielectric substrate,

wherein said first resonator ground being connected to said ground plane for suppressing undesirable resonator resonance, and said second resonator ground being connected to said ground plane for controlling a radiation pattern of said resonator to produce a substantially omnidirectional antenna beam pattern.

11. The omnidirectional antenna according to claim 10 wherein said top conductive plate and said bottom conductive plate have a predetermined length and width, and wherein said length is substantially greater than said width.

12. The omnidirectional antenna according to claim 11 wherein said receiver has a predetermined operating frequency, and wherein said predetermined length of said top conductive plate is equal to or greater than one-quarter wavelength at the predetermined operating frequency.

13. The omnidirectional antenna according to claim 10 wherein said resonator feed presents an impedance to said receiver which is a function of said location of said resonator feed relative to said first end of said dielectric substrate.

14. The omnidirectional antenna according to claim 10 wherein said resonator feed presents a short circuit to minimize static charge buildup at said receiver.

15. The omnidirectional antenna according to claim 10 wherein said undesirable resonator resonance is suppressed in relation to said location of said first resonator ground relative to said first end of said dielectric substrate.

16. The omnidirectional antenna according to claim 10 wherein said radiation pattern is controlled as a function of said location of said second resonator ground relative to said first end of said dielectric substrate.

17. The omnidirectional antenna according to claim 10 wherein said receiver ground plane provides a ground potential for said receiver coupled to said resonator feed.

18. The omnidirectional antenna according to claim 10, wherein said resonator further comprises a plurality of sockets to provide connection between said resonator and said receiver ground plane.

19. A portable communication device comprising:

an omnidirectional antenna, comprising

a substrate having a first metallization layer, and at least a second metallization layer for establishing a receiver ground plane;

a resonator, comprising

a dielectric substrate having a top conductive plate and a bottom conductive plate, wherein said top conductive plate is shorted to said bottom conductive plate at a first end of said dielectric substrate and open at a second end of said dielectric substrate,

a resonator feed having a location between said first and second ends of said dielectric substrate, for providing an intercepted message signal including an address,

a first resonator ground being connected to said bottom conductive plate and having a location which is distal to said first end of said dielectric substrate, and

a second resonator ground being connected to said top conductive plate and to said bottom conductive plate and having a location which is proximal to said first end of said dielectric substrate,

wherein said first resonator ground being connected to said ground plane for suppressing undesirable resonator resonance, and said second resonator ground being connected to said ground plane for controlling a radiation pattern of said resonator to produce a substantially omnidirectional antenna beam pattern;

a receiver, interconnected by said first metallization layer and coupled to said resonator feed, for receiving and demodulating the intercepted message signal including the address by said omnidirectional antenna;

a decoder, interconnected by said first metallization layer and coupled to receiver, for decoding the address received, and for generating an alert control signal in response to the address matching a predetermined address; and

alerting means, interconnected by said first metallization layer and responsive to the alert control signal, for alerting a user of a message.

20. The omnidirectional antenna according to claim 19 wherein said top conductive plate and said bottom conductive plate have a predetermined length and width, and wherein said length is substantially greater than said width.

21. The omnidirectional antenna according to claim 20 wherein said receiver has a predetermined operating frequency, and wherein said predetermined length of said top conductive plate is equal to or greater than one-quarter wavelength at the predetermined operating frequency.

22. The omnidirectional antenna according to claim 19 wherein said resonator feed presents an impedance to said receiver which is a function of said location of said resonator feed relative to said first end of said dielectric substrate.

23. The omnidirectional antenna according to claim 19 wherein said resonator feed presents a short circuit to minimize static charge buildup at said receiver.

24. The omnidirectional antenna according to claim 19 wherein said undesirable resonator resonance is suppressed in relation to said location of said first resonator ground relative to said first end of said dielectric substrate.

25. The omnidirectional antenna according to claim 19 wherein said radiation pattern is controlled as a function of said location of said second resonator ground relative to said first end of said dielectric substrate.

26. The omnidirectional antenna according to claim 19 wherein said receiver ground plane provides a ground potential for said receiver coupled to said resonator feed.

27. The omnidirectional antenna according to claim 19, wherein said resonator further comprises a plurality of sockets to provide connection between said resonator and said receiver ground plane.

28. A transmitting means comprising:

a radio wave transmitter for transmitting communication signals; and

an omnidirectional antenna, coupled to said radio wave transmitter, for launching the communication signals for transmission, said omnidirectional antenna comprising

a conductive plate; and

a resonator, comprising

a dielectric substrate having a top conductive plate and a bottom conductive plate, wherein said top conductive plate is shorted to said bottom conductive plate at a first end of said dielectric substrate and open at a second end of said dielectric substrate,

a resonator feed located between said first and second ends of said dielectric substrate and coupled to said radio wave transmitter, for receiving the communication signals to be launched,

a first resonator ground being connected to said bottom conductive plate and positioned distal to said first end of said dielectric substrate, and

a second resonator ground being connected to said top conductive plate and to said bottom conductive plate and positioned proximal to said first end of said dielectric substrate

wherein said first resonator ground being connected to said conductive plate for suppressing undesirable resonator resonance, and said second resonator ground being connected to said conductive plate for controlling a radiation pattern of said omnidirectional antenna to launch a substantially omnidirectional antenna beam.