TWI777155B - Broadband high directional coupler and broadband standing wave ratio detection device thereof - Google Patents

Abstract

A broadband high-directional coupler and a broadband standing wave ratio detection device thereof are provided. The broadband high-directional coupler includes multiple directional couplers and multiple filters. The directional couplers are electrically connected in series between an antenna and a transceiver, wherein the directional couplers respectively has a different frequency band and respectively provides a coupled signal. The filters are respectively electrically connected to one of the directional couplers to commonly provide a filtered coupling signals, wherein the frequency bands of output signals of the filters are continuous.

Description

Broadband high directional coupler and its broadband standing wave ratio detection device

The present invention relates to a directional coupler, and in particular, to a broadband high directional coupler and a broadband VSWR detection device.

In the field of communications, with the advancement of the fourth generation of mobile phone mobile communication technology standards (4G) and the fifth generation of mobile communication technology (5G), the increase in frequency bands and the broadening of bandwidths , which also brings new challenges for the detection of power amplifiers (PA) and the VSWR at the antenna end for multi-base station co-location, that is, to achieve high directivity of the directional coupler in a wide frequency bandwidth to reduce the VSWR detection error.

It is difficult to realize a directional coupler with wide frequency and high directivity in the traditional scheme. There are two general design ideas: first, to increase the bandwidth of the directional coupling itself, for example, by using a special coupling structure; or, second, to use multiple narrowband couplings The switch matrix is switched to form a time-division multiplexing coupling device.

However, increasing the bandwidth of the directional coupling itself usually requires a large structure size, and at the same time, there may be an embarrassing situation of different coupling degrees in different frequency bands. Moreover, the time-division multiplexing coupling device formed by using multiple narrow-band couplers and switch matrices is still a narrow-band coupler and cannot perform broadband coupling at the same time; and the above-mentioned coupling device has a complicated structure and is actually a The source circuit must be configured with power and control signals to work properly.

Therefore, there is still room for improvement in the directional coupler with wide frequency and high directivity, and it is extremely waiting for designers to propose solutions.

The invention provides a broadband high directional coupler and a broadband standing wave ratio detection device thereof, which can couple the entire broadband without the need for time division multiplexing.

The broadband high directional coupler of the present invention includes a plurality of directional couplers and a plurality of filters. The directional couplers are electrically connected in series between the antenna and the transceiver, wherein the directional couplers have different frequency bands and provide coupled signals respectively. The filters are individually electrically connected to one of the directional couplers to collectively provide a filtered coupled signal, wherein the frequency bands of the output signals of the filters are continuous.

The broadband standing wave ratio detection device of the present invention comprises: a plurality of directional couplers, a plurality of filters, and a detection circuit. The directional couplers are electrically connected in series between the antenna and the transceiver, wherein the directional couplers have different frequency bands and provide coupled signals respectively. The filters are individually electrically connected to one of the directional couplers to collectively provide a filtered coupled signal. Detection circuitry is electrically connected to the filters to detect the standing wave ratio of the antenna based on filtered coupled signals from the filters.

Based on the above, the broadband high directional coupler and the broadband VSWR detection device of the embodiment of the present invention can simultaneously detect the entire broadband by connecting a plurality of directional couplers in parallel, so as to provide filtered coupling signals corresponding to different frequency bands . In this way, wide-band coupling can be performed through a simple circuit configuration, and the possibility of different coupling degrees in different frequency bands can be reduced.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

FIG. 1 is a schematic diagram of a broadband VSWR detection apparatus according to an embodiment of the present invention. Referring to FIG. 1 , in this embodiment, the broadband VSWR detection device 100 includes a broadband high-directional coupler 110 and a detection circuit 120 . The broadband high-directional coupler 110 is electrically connected between the antenna 10 and the transceiver 20 to provide a filtered coupling signal Scpx, wherein the frequency band of the filtered coupling signal Scpx is continuous, and the continuous frequency band forms a section very broad frequency band. The detection circuit 120 is electrically connected to the broadband VSWR detection device 100 to detect the VSWR of the antenna 10 based on the filtered coupling signal Scpx from the broadband VSWR detection device 100 .

In this embodiment, the broadband standing wave ratio detection apparatus 100 includes a plurality of directional couplers 111_1 ˜ 111_N and a plurality of filters 113_1 ˜ 113_N, wherein N is a positive integer greater than or equal to 2. The directional couplers 111_1 - 111_N are electrically connected in series between the antenna 10 and the transceiver 20 , wherein the directional couplers 111_1 - 111_N have different frequency bands and provide coupling signals (ie Scp1 - ScpN). The plurality of filters 113_1 ˜ 113_N are individually electrically connected to one of the directional couplers 111_1 ˜ 111_N to collectively provide the filtered coupling signal Scpx, wherein the output signals of the filters 113_1 ˜ 113_N may be aligned with each other but do not overlap, That is, the -0.1dB point of the output signal of each of the filters 113_1 to 113_N completely or substantially coincides with the -0.1dB point of the output signal of the adjacent filters 113_1 to 113_N.

Moreover, the detection circuit 120 includes a power detection unit 121 , an analog-to-digital converter (Analog-to-digital converter, ADC) 123 and a controller 125 . The power detection unit 121 is electrically connected to the filters 113_1 ˜ 113_N to provide a power signal Spw indicating the power level of the filtered coupling signal Scpx from one of the filters 113_1 ˜ 113_N. The analog-to-digital converter 123 is electrically connected to the power detection unit 121 to provide power data Dpw indicative of the power level of the filtered coupled signal Scpx. The controller 125 is electrically connected to the analog-to-digital converter 123 to detect the standing wave ratio of the antenna 10 based on the power data Dpw from the analog-to-digital converter 123 .

According to the above, by connecting multiple directional couplers in parallel, the entire broadband can be detected at the same time, and multiple coupled signals corresponding to different frequency bands can be simultaneously provided. In this way, wide-band coupling can be performed through a simple circuit configuration, and the possibility of different coupling degrees in different frequency bands can be reduced. Moreover, by adjusting each directional coupler, the directivity of coupling in different frequency bands can be adjusted individually. Secondly, by adjusting the number of directional couplers connected in series, the bandwidth coupled by the broadband high directional coupler 110 can be adjusted.

In this embodiment, the frequency bandwidths of the directional couplers 111_1 ˜ 111_N may be different from each other, or the frequency bandwidths of the directional couplers 111_1 ˜ 111_N may be the same as each other, wherein the frequency bands of the directional couplers 111_1 ˜ 111_N are continuous, and. In addition, the frequency band of each directional coupler 111_1 ˜ 111_N and the frequency band of the adjacent directional couplers 111_1 ˜ 111_N may not overlap with each other, or the frequency band of each directional coupler 111_1 ˜ 111_N and the frequency band of the adjacent directional couplers 111_1 ˜ 111_N Can partially overlap.

In this embodiment, the filters 113_1 ˜ 113_N can be band-pass filters individually, that is, the filters 113_1 ˜ 113_N can form a coupling multiplexer or a radio frequency multiplexer, but the embodiment of the present invention is not limited thereto. Moreover, through the operation of the coupling multiplexer or the RF multiplexer, the filters 113_1 ˜ 113_ and the directional couplers 111_1 ˜ 111_N can be regarded as a plurality of coupling paths with different frequency bands. Since the filters 113_1 ˜ 113_N have different frequency bands, the RF signals transmitted or received by the transceiver 20 will only provide (or generate) the coupled signals through the coupling paths of the corresponding frequency bands, that is, at the same time, only the RF signals transmitted or received by the filters 113_1 ˜ 113_N will be provided (or generated). One of them provides the filtered coupled signal Scpx to the power detection unit 121 of the detection circuit 120 .

In the diagram of this embodiment, the directional couplers 111_1 to 111_N are reverse couplers as an example, and through the above-mentioned multiple filters, power detection units and analog-to-digital converters for processing reverse-coupled signals, to obtain Back-coupled power profile. It can be understood that, when performing the VSWR detection, the broadband VSWR detection device needs to additionally include a plurality of forward couplers and a plurality of filters sequentially connected thereto, a power detection unit and an analog-to-digital converter. That is, a plurality of forward couplers sequentially pass through a plurality of filters for processing forward coupled signals, a power detection unit and an analog-to-digital converter to generate forward coupled power data. Finally, the reverse coupled power data and the forward coupled power data are received by the same controller to detect the standing wave ratio.

In summary, the broadband high directional coupler and the broadband VSWR detection device of the embodiment of the present invention can simultaneously detect the entire broadband by connecting multiple directional couplers in parallel, so as to provide filtered signals corresponding to different frequency bands. coupled signal. In this way, wide-band coupling can be performed through a simple circuit configuration, and the possibility of different coupling degrees in different frequency bands can be reduced.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

10: Antenna 20: Transceiver 100: Broadband standing wave ratio detection device 110: Broadband high directional coupler 111_1~111_N: directional coupler 113_1~113_N: Filter 120: Detection circuit 121: Power detection unit 123: Analog to Digital Converter 125: Controller Dpw: power data Scp1~ScpN: coupled signal Scpx: filtered coupled signal Spw: power signal

FIG. 1 is a schematic diagram of a broadband VSWR detection apparatus according to an embodiment of the present invention.

10: Antenna

20: Transceiver

100: Broadband standing wave ratio detection device

110: Broadband high directional coupler

111_1~111_N: directional coupler

113_1~113_N: Filter

120: detection circuit

121: Power detection unit

123: Analog to Digital Converter

125: Controller

Dpw: power data

Scp1~ScpN: coupled signal

Scpx: filtered coupled signal

Spw: power signal

Claims (10)

A broadband high-directional coupler, comprising: a plurality of directional couplers, electrically connected in series between an antenna and a transceiver, wherein the directional couplers have different frequency bands and provide a coupled signal; and Each of the filters is electrically connected to the directional couplers, so as to jointly provide a filtered coupled signal, wherein the frequency bands of the output signals of the filters are continuous. The broadband high directional coupler of claim 1, wherein the directional couplers have different bandwidths from each other. The broadband high directional coupler of claim 1, wherein the directional couplers have the same bandwidth as each other. The broadband high-directional coupler according to claim 1, wherein the frequency bands of each of the directional couplers and the frequency bands of adjacent directional couplers do not overlap with each other. The broadband high-directional coupler as claimed in claim 1, wherein the frequency band of each of the directional couplers partially overlaps the frequency band of the adjacent directional couplers. The broadband high-directional coupler according to claim 1, wherein the filters are bandpass filters respectively. A broadband standing wave ratio detection device, comprising: a plurality of directional couplers electrically connected in series between an antenna and a transceiver, wherein the directional couplers have different frequency bands and provide a coupled signal; a plurality of filters, respectively electrically connected to the directional couplers to provide the filtered coupling signal together, wherein the frequency bands of the output signals of the filters are continuous; and a detection circuit electrically connected to the filters to detect a standing wave ratio of the antenna based on the filtered coupled signals from the filters. The broadband VSWR detection device as claimed in claim 7, wherein the filters are individually bandpass filters. The broadband standing wave ratio detection device according to claim 7, wherein the frequency bands of the directional couplers are continuous. The broadband standing wave ratio detection device of claim 7, wherein the detection circuit comprises: a power detection unit electrically connected to the filters to provide a power signal indicating the power level of the filtered coupled signal an analog-to-digital converter electrically connected to the power detection units to provide a power data indicative of the power level of the filtered coupled signal; and a controller electrically connected to the analog-to-digital converter to The power profile of the analog-to-digital converter detects the standing wave ratio of the antenna.

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