TWI521793B - Multi-band printed antenna - Google Patents

Description

Printed multi-frequency antenna

The present invention relates to a printed antenna, and more particularly to a printed multi-frequency antenna suitable for a single radiator to generate multi-band operation.

Remote controls or remote controls have been widely used for remote operation of consumer electronics such as televisions, audio systems, DVD (Digital Video Disc) players and game consoles. The remote control allows a user to control the electronic device at a remote location or at a distance from the user via wireless communication. The antenna is an indispensable part of the remote control or remote controller for communicating with the electronic device.

The existing electronic products are designed to be easy for the user to use, and the body is gradually designed to be light, thin, short, and small. To reduce the volume of the entire remote controller or remote controller, it is generally built into the remote controller. Or within the remote controller. Therefore, not only the circuit board provided inside the electronic product has a relatively small area, but the existing electronic products usually use a printed type in order to save manufacturing cost, mass production convenience, and reduce the size of the electronic product. The circuit technology pre-prints the antenna on the printed circuit board, thereby integrally forming the system circuit inside the electronic communication product, and can effectively improve the reliability of the internal system circuit board of the electronic communication product.

In general, the size of the antenna is dependent on the operating frequency. However, antennas of different lengths will be presented depending on the operating frequency. Therefore, only a single-size antenna can be designed in a single remote controller or a remote controller. If a single remote controller or a remote controller can operate multiple frequencies, it is necessary to design antennas of different lengths to be printed on the printed circuit board. Relatively increase the printed circuit board area, increase the size of the remote control or remote controller, and violate the electronic product as the direction of light, thin, short, and small, and the design and production costs are relatively increased, which is for the general market. For the requirements of the antenna design, there is obviously room for further improvement.

The main object of the present invention is to provide a printed multi-frequency antenna that provides a signal oscillating in a frequency range by a single antenna, and then adjusts one passive component group and one passive component circuit connected to the antenna to enable the antenna. The signal is oscillated in another frequency range to achieve the effect of multi-frequency operation by a single antenna, and can greatly improve the antenna performance.

In order to achieve the above object, a preferred embodiment of the printed multi-frequency antenna of the present invention includes: a substrate and an antenna. The substrate has a circuit layout on one surface thereof, and the circuit layout has a grounding portion and a control circuit. The antenna is located on the layer, and the antenna further comprises: a radiator, a feed radiator, a first ground radiator and a second ground radiator. The feed radiator has one end connected to the radiator, and the other end is electrically connected to the control circuit by a passive component group. The first grounded radiator has one end connected to the radiator, and the other end is electrically connected to the ground by a passive component circuit. The second grounding radiator has one end connected to the radiator and the other end electrically connected to the ground. The antenna can provide signal oscillating in a frequency range, and adjust the passive component group and the passive component circuit to provide the signal to oscillate in another frequency range, so that the printed multi-frequency antenna of the present invention is more Better radiation field type and better return loss, which can greatly improve the antenna performance.

The radiator is connected to a passive component group by a feeding end, and at least one grounding terminal is connected to a passive component circuit, and the antenna is provided to provide signal oscillating in different frequency ranges by merely adjusting the passive component group and the passive component circuit. (Band) to achieve the effect of multi-band operation with a single antenna, and it is more convenient and cost-effective to manufacture and use.

Please refer to FIG. 1 and FIG. 2 , which are schematic diagrams of the three-dimensional structure and circuit device of the preferred embodiment of the printed multi-frequency antenna of the present invention. The printed multi-frequency antenna of the present invention comprises: a substrate 1 and an antenna 2. The substrate 1 may be a multilayer printed circuit board composed of a dielectric material and is substantially in the shape of a flat rectangular shape. The substrate 1 has a circuit layout 12 on a layer 11 thereof. The layer 11 defines an X direction and a Y direction perpendicular to each other, and the thickness of the substrate 1 is along a Z direction (simultaneous vertical X direction and Y direction). ) Take measurements. The circuit layout 12 is composed of a plurality of integrated circuit components and a plurality of electronic components. The circuit layout 12 has a grounding portion 13 and a control circuit 14. The ground portion 13 functions to provide electrical ground (GND). The control circuit 14 can provide a wireless transmission function. Since the control circuit 14 described herein can be used with conventional techniques and is not the main technical features of the present invention, its detailed configuration will not be described below.

The antenna 2 is fabricated on the layer 11 by etching or printing and is adjacent to the circuit layout 12. The antenna 2 further includes: a radiator 21, a feed radiator 22, a first ground radiator 23, and a second ground radiator 24. Since the size of the existing electronic communication product is getting smaller and smaller, the area of the substrate 1 is relatively smaller, so that the area and position of the antenna 2 that can be supplied and disposed on the substrate 1 are also greatly limited. The length of the radiator of the antenna 2 can be matched with the resonance requirement of one-eighth wavelength, and the effective length required for the antenna 2 to transmit or receive the signal is increased. The radiator 21 of the present invention further has a long radiator 211 and a a short radiator 212 and a connecting radiator 213, the long radiator 211 and the short radiator 212 are substantially parallel and extend in the Y direction, and the connecting radiator 213 extends in the X direction, respectively connecting the long radiator 211 and The short radiator 212. The feed radiator 22 has a substantially L-shaped shape, one end of which is connected to the short radiator 212, extends substantially in the X direction to a turning point 221, and then extends in the Y direction and is first connected to a passive component group 3. And electrically connected to the control circuit 14. In other words, the antenna control signal generated by the control circuit 14 must pass through the passive component group 3 between the feed radiator 22 and the control circuit 14 before being fed into the radiator 22. One end is fed into the antenna 2.

One end of the first ground radiator 23 is connected to the long radiator 211, and extends substantially in the X direction for a predetermined length, and the other end is electrically connected to the ground portion 13 by a passive component circuit 4. The passive component circuit 4 is a second passive component 42 connected in parallel with a third passive component 43 and then connected in series with one of the fourth passive component 44 and a fifth passive component 45. The second grounding radiator 24 has a substantially L-shaped shape, and one end thereof is connected to the short radiator 212 and the feeding radiator 22, and extends substantially in the Y direction to a turning portion 241, and then extends in the X direction. The other end is electrically connected to the grounding portion 13.

In the present invention, the passive component group 3 can be either a capacitor or an inductor. In the embodiment shown in FIG. 2, when the passive component group 3 is a capacitor having a capacitance value of 15*10 ^-12 Farad (15 pF) and the passive component circuit 4 is electrically shorted (ie, the One of the second passive component 42 and the third passive component 43 is conductive while the other is not, and at the same time one of the fourth passive component 44 and the fifth passive component 45 is conductive and the other is not Or the four passive components 42, 43, 44, 45 are all turned on, any of the above cases, so that the antenna 2 can provide a signal to oscillate in a first frequency range, and the frequency band of the first frequency range is substantially It is 433MHz or 900MHz.

However, by adjusting the passive component group 3 and the passive component circuit 4, the oscillating frequency band of the antenna 2 of the present invention can be adjusted from the first frequency range to a second frequency range without changing the antenna 2 at all. Length or design, and the first frequency range is different from the second frequency range. For example, when the passive component group 3 is adjusted to an inductance, the inductance value is 27*10 ^-9 Henry (27 nH), and the second passive component 42 is adjusted to a capacitance, and the capacitance value of the capacitor is 1*. ^10-12 Farad (1pF), the fourth passive component 44 is adjusted to an inductance, the inductance value of the inductance is 1.5*10 ^-9 Henry (1.5nH), and the third passive component 43 and the fifth passive component 45 is not a component (open circuit), which will enable the antenna 2 to provide a signal to oscillate in another second frequency range. In this embodiment, the frequency band of the second frequency range is 315 MHz.

Please refer to FIG. 3A to FIG. 3C, which are radiation pattern diagrams of the printed multi-frequency antenna of the present invention tested on the X-Y, X-Z and Y-Z planes of the application frequency range (433 MHz and 900 MHz). As can be seen from the above figures, the radiation pattern of the printed multi-frequency antenna of the present invention in the application band range (433 MHz and 900 MHz) is substantially close to a circle, which means that the angles and directions are more balanced. And no dead ends, so it can provide better communication quality.

Please refer to FIG. 4, which is a test return loss diagram of the printed multi-frequency antenna of the present invention in the application frequency range (433 MHz and 900 MHz). As can be seen from the above figure, when the antenna 2 is applied at 433 MHz (shown as the Δ1 position in FIG. 4), the foldback loss is substantially -8.41 dB, and the efficiency is up to 59.29%; in addition, the antenna 2 When applied to 900MHz (shown as the ▽2 position in Figure 4), its foldback loss is roughly -19.80dB, and the efficiency can reach up to 65.39%.

It can be seen that the printed multi-frequency antenna of the present invention is in the antenna resonance frequency band, which is sufficient for the general market design of high-efficiency antenna design. It is conceivable that the printed multi-frequency antenna of the present invention can provide signal oscillating in a first frequency range, and by adjusting the passive component group and the passive component circuit, the same antenna can be provided to oscillate the signal to another A second frequency range provides a better radiation field type and better return loss for the printed multi-frequency antenna of the present invention, and can greatly improve the antenna performance.

The above embodiments are not intended to limit the scope of application of the present invention. The scope of protection of the present invention should be based on the technical spirit defined by the content of the patent application scope of the present invention and the scope thereof. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

1. . . Substrate

11. . . Level

12. . . Circuit layout

13. . . Grounding

14. . . Control circuit

2. . . antenna

twenty one. . . Radiator

211‧‧‧Long radiator

212‧‧‧Short radiator

213‧‧‧Connecting radiators

22‧‧‧Feed into the radiator

221‧‧‧ turning point

23‧‧‧First grounded radiator

24‧‧‧Second grounded radiator

241‧‧‧ turning point

3‧‧‧ Passive component group

4‧‧‧ Passive component circuit

42‧‧‧Second passive components

43‧‧‧ Third passive component

44‧‧‧Fourth passive component

45‧‧‧ fifth passive component

1 is a schematic perspective view of a preferred embodiment of a printed multi-frequency antenna of the present invention.

2 is a schematic diagram of a circuit device of a preferred embodiment of the printed multi-frequency antenna of the present invention.

Figure 3A is a radiation pattern diagram of the printed multi-frequency antenna of the present invention tested on the X-Y plane of the application band range (433 MHz and 900 MHz).

Figure 3B is a radiation pattern diagram of the printed multi-frequency antenna of the present invention tested on the X-Z plane of the application band range (433 MHz and 900 MHz).

Figure 3C is a radiation pattern diagram of the printed multi-frequency antenna of the present invention tested on the Y-Z plane of the application band range (433 MHz and 900 MHz).

Figure 4 is a graph of the test foldback loss of the printed multi-frequency antenna of the present invention in the application band range (433 MHz and 900 MHz).

1. . . Substrate

11. . . Level

12. . . Circuit layout

13. . . Grounding

14. . . Control circuit

2. . . antenna

twenty one. . . Radiator

211. . . Long radiator

212. . . Short radiator

213. . . Connecting radiator

twenty two. . . Feeding radiator

221. . . Turning place

twenty three. . . First grounded radiator

twenty four. . . Second grounded radiator

241. . . Turning place

3. . . Passive component group

4. . . Passive component circuit

Claims (9)

A printed multi-frequency antenna includes: a substrate having a circuit layout on a layer surface, the circuit layout having a ground portion and a control circuit; an antenna disposed on the layer, the antenna further including a radiator; a feed radiator, one end of which is connected to the radiator, and the other end is electrically connected to the control circuit by a passive component group; a first ground radiator, one end of the radiator The other end is electrically connected to the ground portion by a passive component circuit; wherein the passive component circuit is a second passive component and a third passive component are connected in parallel, and then connected in series and one of the fourth passive And a fifth grounding element; a second grounding radiator, one end of which is connected to the radiator, and the other end is electrically connected to the grounding portion; wherein the antenna can provide signal oscillation in a first frequency range By adjusting the passive component group and the passive component circuit, the antenna can be oscillated to a second frequency range, and the second frequency range and the first frequency range are Different. The printed multi-frequency antenna according to claim 1, wherein the radiator further has a long radiator, a short radiator and a connecting radiator, and the long radiator and the short radiator are parallel. The connecting radiators are respectively connected to the long radiator and the short radiator. The printed multi-frequency antenna of claim 2, wherein the feed radiator and the second ground radiator are opposite to the short radiator Connected to each other, and the first grounded radiator is connected to the long radiator. The printed multi-band antenna of claim 1, wherein the frequency band of the first frequency range is one of 433 MHz or 900 MHz, and the passive component group is a capacitor, and the passive component circuit is Electrical short circuit. The printed multi-frequency antenna of claim 4, wherein the capacitance has a value of 15*10 ^-12 Farad (15 pF). The printed multi-band antenna of claim 1, wherein the frequency band of the second frequency range is 315 MHz, and the passive component group and the fourth passive component are an inductor, and the second passive component is a Capacitor, and the third passive component and the fifth passive component are not in use. The printed multi-frequency antenna according to claim 6, wherein the passive component has an inductance value of 27*10 ^-9 Henry (27 nH), and the second passive component has a capacitance of 1*10. ^-12 Farad (1pF), and the inductance of the fourth passive component is 1.5*10 ^-9 Henry (1.5nH). The printed multi-frequency antenna of claim 1, wherein the feed radiator has an L-shape, and the feed radiator has a turn. The printed multi-frequency antenna of claim 1, wherein the second grounded radiator has an L-shape, and the feed radiator has a turning point.