CN104320101A - Antenna self-adaptation control matching circuit - Google Patents

Abstract

The invention relates to an antenna self-adaptation control matching circuit. The antenna self-adaptation control matching circuit structurally comprises a power amplifier, a capacitor, an attenuator, a mixer, a filter, a broadband matching circuit and a control circuit. The load impedance and the working frequency are not limited. The problem that the system performance is degraded due to the fact that losses are produced when most matching networks are used is solved. Meanwhile, according to specific requirements, the network size and losses are set, and the self-adaptation control is achieved. The antenna self-adaptation control matching circuit has the advantages of being good in adaptability and stability. In addition, a passive inductor and a capacitance element are adopted in the adjustable matching circuit, the circuit bandwidth is larger, losses are smaller, the adjustability function can be achieved in various frequency bands, and the antenna self-adaptation control matching circuit can be widely applied in a corresponding frequency band system needing a self-adaptation matching circuit.

Description

A kind of adaptive control match circuit of antenna

Technical field

The present invention relates to radio system adaptive control match circuit, belong to electronics and the communications field.

Background technology

Along with the development of the systems such as microwave and millimeter wave communication, radar, the especially development of mobile hand-held wireless communication terminal, individual soldier's satellite mobile communication terminal, military and civilian multimode multiplex communication terminal, harsh all the more to the requirement of device in system.Wherein running into maximum problems is exactly about power delivery problem, and this is also attractive especially problem in network theory, in communication equipment and sorts of systems.The application of lossless matching network is very extensive, and its quality directly determines the quality of product, so to the research of lossless matching network with to produce be always various countries' attention.Due to the development of computer technology, solid-state technique, material industry, the development of matching network also steps on a new stage, and towards high accuracy, low-power consumption, small size future development.Improving constantly along with digital communication system clock frequency, and the increase of digital network in speed and bandwidth simultaneously, has wider passband to matching network and tunable characteristic also proposes higher requirement.And the matching network utilizing conventional method to design is faced with the adjustable problem of bandwidth sum, the present invention, mainly based on this point, adopts the matching network circuit that new, adopts a kind of self-adaptation control method to achieve a kind of broadband, adjustable adaptive matching networks.

Summary of the invention

The object of the invention is the adaptive control match circuit providing a kind of antenna, and this network has adaptive control, structure is simple, wider bandwidth, volume are little, stability is high match circuit.

The technical scheme realizing the object of the invention is: this Adaptive matching circuit structure adopts power amplifier, electric capacity, attenuator, frequency mixer, filter, broadband matching circuit and control circuit to realize, wherein RF signal produces certain reflection coefficient through mixing, filtering, reflection coefficient control circuit and deamplification acting in conjunction match circuit, make reflection coefficient reach minimum by adjustable matching network.Its signal sends through antenna or receives.Reflection coefficient is made to reach minimum by adjustable matching network.

Compared with prior art, because the present invention adopts adaptive control matching network, the remarkable advantage brought is: (1) matching network self adaptation is adjustable; (2) bandwidth is adjustable; (3) regulable center frequency; (4) volume is little; (5) stability is high; (6) applicability is extensive, is applicable in the various system to performance requirement harshness.

Accompanying drawing explanation

Fig. 1 is the adaptive control match circuit structural representation of a kind of antenna of the present invention.

Fig. 2 be the adaptive control match circuit of a kind of antenna of the present invention there are the two of shunt capacitancenetwork.

Fig. 3 is adaptive control match circuit insertion loss and the return loss performance plot of a kind of antenna of the present invention.

Fig. 4 is the adaptive control match circuit phase characteristic figure of a kind of antenna of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Composition graphs 1 the present invention is a kind of adaptive matching networks, chooses the wave band of 1-2GHz as an example, be described at this.Adaptive control matching network in this new antenna system, this Adaptive matching circuit structure adopts power amplifier, electric capacity, attenuator, frequency mixer, filter, broadband matching circuit and control circuit to realize, wherein RF signal produces certain reflection coefficient through mixing, filtering, reflection coefficient control circuit signal and deamplification acting in conjunction match circuit, make reflection coefficient reach minimum, its signal sends through antenna or receives.By controlling minimal reflection coefficient, the size of its load impedance can be changed by adjustable matching network, thus reaches the function of control.

Composition graphs 2, it is two that adjustable matching network chooses bypassnetwork, it at least has a single variable capacitor in parallel with inductor.By changing electric capacitysize, can amount of bandwidth be adjusted, very easily Circuit tuning performance, to meet performance requirement.

Composition graphs 3, Fig. 4, choose the result of above-mentioned matching network as explanation, now the bandwidth of circuit reaches 1GHz, and within the scope of this, its phase place is expressed as linear phase, the result shows that this control circuit has good Broadband Matching performance.

Composition graphs 1, Fig. 2, the adaptive control match circuit of inventive antenna, its operation principle is summarized as follows: this Adaptive matching circuit structure adopts power amplifier, electric capacity, attenuator, frequency mixer, filter, broadband matching circuit and control circuit to realize, wherein RF signal produces certain reflection coefficient through mixing, filtering, reflection coefficient control circuit makes reflection parameters reach minimum with deamplification acting in conjunction match circuit, by changing the size of adjustable matching network electric capacity, can amount of bandwidth be adjusted, realize bandwidth controlled.Make the loss of network minimum.Thus realize the adaptive control function of matching network.

Adaptive control matching network of the present invention is by realizations such as amplifier, frequency mixer and relevant passive devices, and processing is simple, and good stability, reliability is high.Wherein adjustable matching network can adopt different forms to realize, thus volume is significantly reduced.Show fabulous Broadband Matching performance.

Claims (4)

1. the adaptive control match circuit of an antenna, it is characterized in that: this Adaptive matching circuit structure adopts power amplifier, electric capacity, attenuator, frequency mixer, filter, broadband matching circuit and control circuit to realize, wherein RF signal produces certain reflection coefficient through mixing, filtering, reflection coefficient control circuit makes reflection parameters reach minimum with deamplification acting in conjunction match circuit, and its signal sends through antenna or receives.

2. according to the adaptive control match circuit of a kind of antenna described in claim 1, it is characterized in that: adjustable matching network is that bypass is twonetwork, it at least has a single variable capacitor in parallel with inductor.

3. according to described in claim 1 adaptive control matching network, it is characterized in that: the size of load impedance can be changed by adjustable matching network, makes the input impedance of network and output impedance reach conjugate impedance match, thus reaches the function of control.

4. the adaptive control matching network according to claim 1 or 3, is characterized in that: circuit structure can realize adaptive network coupling in 1MHz-10GHz frequency range.