SU813549A1 - Coupling element - Google Patents

Description

one

This invention relates to radio engineering and can be used in microwave filters for coupling resonators.

A communication element is known, preferably for resonators in filters, states of an inductive loop of pin diodes, the first of which is connected in series with the inductive loop, and the second pin diode is paral .; an inductive loop with a first polarization diode of opposite polarity, the inductive loop being connected at one end through a pass-through capacitor to the power supply bus 1.

However, the well-known communication element rffe provides the soaking factor of the inductive loop.

The purpose of the invention is to provide a constant demagnetization factor of the inductive loop factor with a discrete change in its own inductance.

To achieve this goal, a communication element, mainly for resonator coupling in filters, consists of an inductive loop and p i p-diodes, the first of which is connected in series with the inductive loop and loops with the first pin-diode of opposite polarity, with the inductive loop connected at one end through the pass-through capacitor to the power supply bus, two additional inductive half-loops are introduced by the third and

0 the fourth pin diode connected to the ends of the inductive loop and to the body, the third pin diode connected in series with the first pin diode, the fourth pin diode one - in series with the second pin diode, and the other end of the inductive loop connected to the body through an additional a flax capacitor and a fifth pin diode, the polarity of which is opposite to the polarity of the fourth p I p-diode.

The drawing shows an electrical equivalent circuit of the proposed device.

The communication element contains an inductive loop 1, first and second pin diodes 2 and 3, inductive half loops 4 and 5, third and fourth pin diodes

0 b and 7, pass capacitor 8, bus

power supply, capacitor 10 pin pin diode 11.

The device works as follows.

The inductive loop 1 is located between the resonators in their antinodes. “The magnetic field so that the inductive half loop 4 and 5 are placed in the adjacent resonators.

The discrete change in the inductance of the loop 1 is carried out by varying the polarity of the bias voltage applied to the bus 9 relative to the body. With a positive offset, the inductance is maximum, and with a negative offset, it is minimal. The demagnetizing factor of the inductive loop 1, due to the influence of the magnetic field of the inductive loop 1 on the magnetic field of the resonators, depends on the area covered by the loop perimeter. The state of the demagnetizing factor 20 ensures that the areas covered by the inductive loop 1 are equal in two discrete states. -diodes 2, 3, 6, 7 and 11. Inductive loop 1., located at the antinodes of the magnetic field of the resonators, partially demagnetizes it. By virtue of the equality of the values of demagnetizing factors with a discrete change in the inductance of the inductive loop 1, a reduction in the influence of the parameters of the inductive loop on the parameters of the resonators is achieved. In order to ensure the same demagnetizing factor, area,. covered by inductive semi-loops 4 and 5 and the ends of inductive loop 1 is chosen so that the degree of demagnetization of the resonator floor does not change when the polarity of the bias voltage changes, 40 which corresponds to two different values of inductance of the inductive loop 1. s

Purpose of the inductive loop bandwidth adjustment in d5 microwave filters without shifting the center frequency.

Positive bias voltage opens pin diodes 2 and 11J that

corresponds to a wide nojjoce transmittance; pin diodes 3, 6 and 7 bans. When the bias voltage is negative, the pin diodes 3, 6 and 7 are open, and the pin diodes 2 and 11 are locked; this case corresponds to a narrow bandwidth, and the magnetic field of the resonators in the filter is further demagnetized by inductive half-loops 4 and 5. The capacitor 10 has a low reactance for the microwave currents.

Claims (1)

1. USSR author's certificate No. 634405, CL. N 01 R 7/00, 1977 (prototype). four Ij f / L v z V - L - L