Wide band antenna for mobile communication

• US 20040145524A1
• Filed: 03/08/2004
• Published: 07/29/2004
• Est. Priority Date: 04/12/2001
• Status: Active Grant

• Current Assignee: Antenna Tech Incorporated
• Original Assignee: Antenna Tech Incorporated
• Inventors: Bae, Jung-Bin
• Granted Patent: US 7,002,520 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line

Abstract

Disclosed is a mobile communication wide band antenna that comprises a radio wave radiator (20, FIG. 3) for receiving transmission signals and power and radiating radio waves corresponding to the transmission signals; and an operating state display (30) for receiving the radio waves radiated by the radio wave radiator and displaying operating states of the radio wave radiator according to the received radio waves. The radio wave radiator comprises a ground surface (25, FIG. 4) for functioning as ground; a radiation element (21) supported by the ground surface to have a first gap (H) from the ground surface and radiating the radio waves; and a microstrip feeder (23) supported by the ground surface, having a second gap (t) and a third gap (h1) from the ground surface, and for receiving the transmission signals and the power and having an electromagnetic coupling with the radiation element (21), the third gap being provided to be located between the ground surface (25) and the radiation element.

Claims

1. A mobile communication wide band antenna comprising:

a radio wave radiator for receiving transmission signals and power and radiating radio waves corresponding to the transmission signals; and

an operating state display for receiving the radio waves radiated by the radio wave radiator and displaying operating states of the radio wave radiator according to the received radio waves.

2. The antenna of claim 1, wherein the radio wave radiator comprises:

a ground surface for functioning as ground;

a radiation element supported by the ground surface to have a first gap from the ground surface and radiating the radio waves; and

a microstrip feeder supported by the ground surface, having a second gap and a third gap from the ground surface, for receiving the transmission signals and the power and having an electromagnetic coupling with the radiation element, the third gap being located between the ground surface and the radiation element.

3. The antenna of claim 2, wherein the microstrip feeder is formed to be L-shaped.

4. The antenna of claim 2, wherein the microstrip feeder is formed to have an impedance matching with an external device for receiving the transmission signals.

5. The antenna of claim 4, wherein the matching impedance is 50 Ω

in the case of the impedance matching.

6. The antenna of claim 5, wherein the matching impedance of 50 Ω

is established according to the second gap between the width of the microstrip feeder and the ground surface.

7. The antenna of claim 2, wherein the dimensions of the radiation element, and the first, second and third gaps are determined according to a central frequency of the total frequency bands including the frequency bands of PCS and IMT-2000 services.

8. The antenna of claim 7, wherein in the case the central frequency is a frequency λ

that belongs to a receipt frequency band of the PCS service, the dimensions (L×

W1) of the radiation element are set to be about λ

/2, the first gap H is about λ

/8, and the third gap is about 0.7 times that of the first gap H.

9. The antenna of claim 2, wherein the operating state display comprises:

a radio wave receiving element, located around the radiation element of the radio wave radiator and supported by the ground surface, for receiving the radio waves radiated by the radiation element and outputting corresponding signals and voltages; and

a power detector for receiving the signals and the voltages output by the radio wave receiving element and displaying the operating states of the radio wave radiator to be distinguished.

10. The antenna of claim 9, wherein the radio wave receiving element is a helical antenna.

11. The antenna of claim 9, wherein the power detector comprises:

a band pass filter (BPF) for receiving the transmission signals and the voltages from the radio wave receiving element and passing signals of a predetermined band;

a PIN diode for adjusting an amount of the signals output by the BPF and outputting result signals;

a dual voltage comparator for receiving the signals output by the PIN diode and comparing the received signals with previously set first and second reference voltages and outputting result voltages; and

a three color light emitting diode for emitting three colors according to the voltage output by the dual voltage comparator.

12. The antenna of claim 11, wherein the antenna further comprises a first variable resistor for adjusting the first reference voltage and a second variable resistor for adjusting the second reference voltage respectively set to the dual voltage comparator.

13. A mobile communication wide band antenna comprising:

a ground surface for functioning as ground;

a monopole radiation element, supported on the ground surface, for radiating radio waves in all directions;

a connector for supplying transmission signals and power to the monopole radiation element, the connector being a portion where the monopole radiation element penetrates the ground surface and is extended;

an impedance matching stub supported by the ground surface and provided to the monopole radiation element with a predetermined gap so as to perform impedance matching;

a radio wave receiving element provided near the monopole radiation element, supported by the ground surface, for receiving the radio waves radiated by the monopole radiation element and outputting corresponding signals and voltages; and

a power detector for receiving the signals and the voltages output by the radio wave receiving element and displaying the operating states of the monopole radiation element to be distinguished.

14. The antenna of claim 13, wherein the radio wave receiving element is a helical antenna.

15. The antenna of claim 13, wherein the monopole radiation element comprises a fixation antenna supported on the ground surface and a rod antenna that penetrates the fixation antenna and is flexibly installed from the ground surface, and the fixation antenna and the rod antenna are cylindrical, and a diameter of the rod antenna is greater than that of the fixation antenna.

16. The antenna of claim 15, wherein the dimensions of the monopole radiation element and the length of the impedance matching stub are determined according to a central frequency of the total frequency bands including the frequency bands of PCS and IMT-2000 services.

17. The antenna of claim 16, wherein in the case the central frequency is a frequency λ

that belongs to a receipt frequency band of the PCS service, the whole length of the monopole radiation element adding the lengths of the fixation antenna 42 and the rod antenna 41 is set to be about λ

/4, and the ratio of the diameter D1 of the fixation antenna and that D2 of the rod antenna is set to be about 8;

11, and the length of the impedance matching stub is set to be about λ

/8.