Frequency hopping filter

Abstract

The utility model provides a frequency hopping filter. The frequency hopping filter comprises a control device, a band-pass filter resonant inductor and a band-stop filter resonant inductor, the control device controls and selects a band-pass filter resonant inductor and a band-stop filter resonant inductor; the system also comprises a multi-path resonant capacitor matrix. And the multi-path resonant capacitor matrix is respectively connected with the band-pass filter resonant inductor or the band-stop filter resonant inductor by adopting a selective switch controlled by a control device. According to the utility model, the general parts of the frequency hopping band-pass filter and the frequency hopping band-stop filter, namely the resonant capacitor matrix circuit, are fully utilized, so that the purposes of reducing the volume and reducing the cost are achieved.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency circuits, in particular to a frequency hopping filter used in radio frequency circuits. Background Art

[0002] In communication radios, frequency hopping filters are indispensable to improve anti-interference performance. In new channel transceiver components, frequency hopping bandpass filters and frequency hopping bandstop filters often appear together. Figure 1 and Figure 2 As shown in FIG, the circuit schematic and block diagram of the frequency hopping filter used in a radio frequency transceiver circuit.

[0003] like Figure 1 and Figure 2 In a radio frequency transceiver circuit, a frequency-hopping bandpass filter and a frequency-hopping bandstop filter are fabricated separately and then connected via an RF switch for switching between them. The bandpass filter comprises a bandpass resonant inductor and a resonant capacitor. By varying the capacitive reactance within a multi-channel resonant capacitor matrix, bandpass filters with different center frequencies can be generated. Similarly, the bandstop filter also comprises a bandstop resonant inductor and a resonant capacitor. Both resonant capacitor components are multi-channel resonant capacitor matrices with identical functions and structures. However, because the resonant capacitor matrix within the frequency-hopping filter occupies a significant amount of space and represents a significant cost, the filter is both bulky and expensive, failing to meet user requirements for a compact and low-cost frequency-hopping filter. Utility Model Content

[0004] The purpose of the utility model is to provide a frequency hopping filter in which only one set of multi-path resonant capacitor matrix is ​​used to address the shortcomings of the current frequency hopping filter, which is not only large in size but also high in cost and cannot meet the user's requirements for miniaturized and low-cost frequency hopping filters.

[0005] The technical solution adopted by the utility model to achieve its technical purpose is: a frequency hopping filter, including a control device, a bandpass filter resonant inductor, and a bandstop filter resonant inductor; the control device controls the selection of the bandpass filter resonant inductor and the bandstop filter resonant inductor; and also includes a multi-way resonant capacitor matrix; the multi-way resonant capacitor matrix adopts a selection switch controlled by the control device to be connected to the bandpass filter resonant inductor or the bandstop filter resonant inductor respectively.

[0006] Furthermore, in the above-mentioned frequency hopping filter: the multi-path resonant capacitor matrix includes at least two N-path resonant capacitor combination circuits; N is a natural number greater than 1.

[0007] Furthermore, in the above-mentioned frequency hopping filter: any resonant capacitor group in the N-way resonant capacitor combination circuit includes capacitor C1, capacitor C2 and capacitor C3; PIN diode D1, PIN diode D2;

[0008] One end of capacitor C1 is connected to the resonant inductor of the bandpass filter or the resonant inductor of the bandstop filter through a selection switch, and the other end is connected to the cathode of PIN diode D1 and the anode of PIN diode D2 respectively. The anode of PIN diode D1 is connected to one end of capacitor C2, and the cathode of PIN diode D2 is connected to one end of capacitor C3; the other ends of capacitor C2 and capacitor C3 are grounded.

[0009] The utility model fully utilizes the common part of the frequency hopping bandpass filter and the frequency hopping bandstop filter, ie, the resonant capacitor matrix circuit, so as to achieve the purpose of reducing the volume and compressing the cost.

[0010] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attachment Figure 1 This is the schematic diagram of the existing frequency hopping filter circuit;

[0012] Attachment Figure 2 This is the principle block diagram of the existing frequency hopping filter;

[0013] Attachment Figure 3 This is a schematic diagram of a frequency hopping filter circuit according to embodiment 1 of the present invention;

[0014] Attachment Figure 4 This is a principle block diagram of the frequency hopping filter in Example 1 of the present utility model. DETAILED DESCRIPTION

[0015] This embodiment is a frequency hopping filter used in a radio frequency circuit, which filters the radio frequency signal received by the antenna as needed or performs frequency hopping filtering on the transmitted radio frequency signal as needed. Figure 3 and Figure 4As shown, the frequency hopping filter of this embodiment includes a bandpass frequency hopping filter portion and a bandstop frequency hopping filter portion. These two portions are controlled by a control device to select either the bandpass frequency hopping filter portion or the bandstop frequency hopping filter portion. Like conventional frequency hopping filters, the filter includes a control device, a bandpass filter resonant inductor, and a bandstop filter resonant inductor. The control device controls the selection of either the bandpass filter resonant inductor or the bandstop filter resonant inductor. The filter also includes a multi-channel resonant capacitor matrix, which is connected to either the bandpass filter resonant inductor or the bandstop filter resonant inductor using a selection switch controlled by the control device. Unlike conventional methods in which both the bandpass frequency hopping filter portion and the bandstop frequency hopping filter portion are configured with a multi-channel resonant capacitor matrix, in this embodiment, the bandpass frequency hopping filter portion and the bandstop frequency hopping filter portion share the same multi-channel resonant capacitor matrix, which is selected by the control device using a selection switch. The selection switch is typically an electronic switch controlled by the control device, such as a MOS transistor.

[0016] In this embodiment, the multi-channel resonant capacitor matrix includes at least two N-channel resonant capacitor combination circuits; N is a natural number greater than 1. Each resonant capacitor group in the N-channel resonant capacitor combination circuit includes a capacitor C1, a capacitor C2, and a capacitor C3; a PIN diode D1 and a PIN diode D2; one end of capacitor C1 is connected to a bandpass filter resonant inductor or a bandstop filter resonant inductor via a selection switch, and the other end is connected to a cathode of PIN diode D1 and an anode of PIN diode D2, respectively; the anode of PIN diode D1 is connected to one end of capacitor C2, and the cathode of PIN diode D2 is connected to one end of capacitor C3; the other ends of capacitors C2 and C3 are grounded.

Claims

1. A frequency hopping filter comprising a control device, a bandpass filter resonant inductor, and a bandstop filter resonant inductor; wherein the control device controls and selects the bandpass filter resonant inductor and the bandstop filter resonant inductor; and wherein: It also includes a multi-channel resonant capacitor matrix; the multi-channel resonant capacitor matrix is ​​connected to the bandpass filter resonant inductor or the bandstop filter resonant inductor respectively through a selection switch controlled by a control device.

2. The frequency hopping filter according to claim 1, wherein: The multi-channel resonant capacitor matrix includes at least two N-channel resonant capacitor combination circuits; N is a natural number greater than 1.

3. The frequency hopping filter according to claim 2, wherein: Any resonant capacitor group in the N-way resonant capacitor combination circuit includes capacitor C1, capacitor C2 and capacitor C3; PIN diode D1 and PIN diode D2; One end of capacitor C1 is connected to the resonant inductor of the bandpass filter or the resonant inductor of the bandstop filter through a selection switch, and the other end is connected to the cathode of PIN diode D1 and the anode of PIN diode D2 respectively. The anode of PIN diode D1 is connected to one end of capacitor C2, and the cathode of PIN diode D2 is connected to one end of capacitor C3; the other ends of capacitor C2 and capacitor C3 are grounded.

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