JPH02128501A - Phase adjusting circuit - Google Patents

Abstract

PURPOSE:To make a microwave integrating circuit low-cost, small-sized, and light-weight by setting a dielectric wide gamma than a conductor of a micro strip line on this conductor and changing its length to adjust the phase. CONSTITUTION:A dielectric 3 is set on a micro strip conductor 2 on a dielectric substrate 1. With respect to this micro strip line, a circuit is normally so designed that the upper part of the conductor 2 is an air layer (epsilongamma=1.0). Consequently, when the dielectric (epsilongamma>1.0) 3 is set on the conductor 2, an equivalent electric length is extended to advance the phase because the dielectric constant of this part is increased. The material, the thickness, and the length in the direction of signal transmission of the dielectric 3 are changed to change the phase. Thus, a micro-sized inexpensive phase adjusting circuit is obtained with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a phase adjustment circuit in a microwave integrated circuit.

[Conventional technology]

Conventionally, an analog phase shifter using a diode has generally been used as a method for controlling phase distortion in microwave integrated circuits.

Figure 8 is a circuit diagram showing a reflection type phase shifter using a conventional circulator as shown in Miyauchi and Yamamoto: [Communication Microwave Circuits], edited by the Institute of Electronics and Communication Engineers, page 318.
4) is a circulator, and I6) is a varactor diode.

Next, the operation will be explained. This phase shifter utilizes the properties of a varactor diode 61 whose capacitance changes depending on the magnitude of the reverse bias voltage applied, and a circulator (4) in which all reflected signals from the diode are taken out from the output side. It is something.

The input signal is input to the varactor diode +51 via the circulator (4), undergoes a phase shift corresponding to the actance of the varactor diode I51, and is taken out from the output terminal of the circulator (41). Figure 4 shows the normal diagram of the varactor diode. In the figure, XI is the normalized reactance when a reverse bias voltage of vI is applied to the varactor diode +51, and θ1 is the output signal phase at that time. Similarly, the normalized reactance, θ, when applying the reverse bias voltage of °
The amount of phase shift is obtained.

Microwave integrated circuits often require fine phase adjustment. Conventionally, phase adjustment has been performed using a reflective phase shifter composed of a hybrid or a circulator, a varactor diode, and a bias supply circuit. Therefore, it has the drawbacks of being expensive due to the large number of component parts and of being large in size.

[Problem to be solved by the invention]

Since the conventional phase adjustment circuit using a reflection type phase shifter is constructed as described above, a circulator, a varactor diode, a bias supply circuit, etc. are indispensable.

As a result, the circuit configuration becomes complex and expensive.

Another problem was that the dimensions were too large.

The present invention has been made to solve the above-mentioned problems, and its object is to obtain a phase 11 phase circuit that is simple in construction, ultra-small, and very inexpensive.

[Means to solve the problem]

This invention enables fine adjustment of the phase by installing a dielectric material having a width wider than the conductor on the conductor of the microstrip line.

[Effect]

In the phase adjustment circuit according to the present invention, fine phase adjustment can be easily performed by attaching a dielectric material to the conductor of the microstrip line and changing the length of the dielectric material.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. 1st
The figure shows a dielectric mounted on a phased microstrip conductor, +31ij conductor +21, according to one embodiment of the present invention.

Next, the operation will be explained. A microstrip line is usually designed with an air layer (εr=1.0) above the conductor (2). Therefore, when a dielectric (εr>1.0) is mounted on the conductor (21), the electrical resistivity of that part increases, the uniform electrical length becomes longer, and the phase advances.Therefore, the material and thickness of the dielectric , the phase changes by changing the length in the signal propagation direction.

Figure 2 is a curve diagram showing the experimental results. Two types of dielectric materials were used in the experiment: alumina and quartz. So-called.

Also, εr=4 for quartz. The amount of phase shift was measured by changing the length L in the signal propagation direction using a device with t = 0.4 tsuba and ω = 8 ms. As a result, the frequency is 10 GHz, and ε as a dielectric substrate.
r = 9, t -0, In a microstrip line with an impedance of 50 fl using 6-layer alumina,
For alumina, L-'10+s is approximately 85°1 For quartz, LlOo+ is approximately 25° phase advance? occured. Note that there was almost no change in VSWR and insertion loss due to the attachment of the dielectric.

In addition, upper li! In the example, the case where alumina and quartz were used as the dielectric material (3) was explained, but a dielectric material with a dielectric constant of 1.0 or more or a non-conductive adhesive may also be used, and the same as in the above example example may be used. effect can be obtained.

4. [Effects of the Invention] As described above, according to this invention rC, in a microwave integrated circuit, by mounting a dielectric material having a width wider than the conductor on the conductor of the microstrip line and changing the length of the dielectric material, Since the phase adjustment is made easy, it is possible to reduce the cost, size and weight of the microwave integrated circuit, and it is possible to do it overnight.

[Brief explanation of drawings]

Figure 1 + al (ill is a plan view and side view showing a phase adjustment circuit according to an embodiment of the present invention, Figure 2 is a curve diagram showing the experimental results from Figure 1, Figure 8 is a diagram showing a phase adjustment circuit using a conventional circulator. A circuit diagram of a reflective phase shifter, and FIG. 4 is a curve diagram showing the relationship between normalized reactance and phase shift amount in FIG. 8. In the figure, 111 is a dielectric substrate, 12 is a conductor, and (3
) indicates a dielectric material. In the figures, the same reference numerals indicate 4-1 or equivalent parts.

Claims (1)

[Claims] A phase adjustment circuit characterized in that a dielectric material having a width wider than the conductor is mounted on the conductor of a microstrip line.