Showing papers on "Return loss published in 1971"

Necessary and sufficient conditions on the poles and zeros of the reflection coefficient for low-pass ladder networks

Abstract: A method by which the element values can be expressed for a class of linear lumped passive resistively terminated LC networks, in terms of the poles and zeros of the reflection coefficient, is described. The driving-point impedance of the networks belonging to this class has the property that the zeros of its even part are all located at infinity in the p plane. The method to be described is broken down into two distinct steps: the first step consists of finding the element values in terms of the power series coefficients of the drivingpoint function and the second step consists of expressing the power series coefficients of the driving-point impedance in terms of the poles and zeros of the corresponding reflection coefficient or the Taylor series coefficients of the return loss function. A numerical example is provided to illustrate the method. The method can be easily extended to the cases in which all the even-part zeros lie at the origin or at any other finite frequency on the j \omega axis.

Sweep-frequency measurement of structural return loss by a carrier-burst method

Abstract: Errors due to hybrid unbalance and reflections from connectors and terminations are eliminated by using a burst of carrier as the test signal. A sampling oscilloscope extracts that part of the signal which is proportional to the reflection from the cable alone.

A 90-dB Microstrip Switch on a Plastic Substrate (Correspondence)

Abstract: A single-pole double-throw (SPDT) microstrip switch has been designed on a plastic (polyolefin) substrate to switch two 10-W CW carriers into a common load over the frequency range 1.7 to 2.3 GHz. No tuning adjustments are used over this 30-percent bandwidth to obtain a 90-dB minimum isolation, a 23-dB minimum return loss, and a 1-dB maximum insertion loss. Units now in production typically have a 0.6-dB insertion loss, a 26-dB return loss, and isolation levels of 105/spl plus mn/5 dB.

A 90 DB Microstrip Switch on a Plastic Substrate

Abstract: A SPDT microstrip switch has been designed on a plastic (polyolefin) substrate to switch two 10 watt cw carriers into a common load over the frequency range 1.7 to 2.3 GHz. No tuning adjustments are used over this 30% bandwidth to obtain a 90 dB minimum isolation, a 23 dB minimum return loss, and a one dB maximum insertion loss. Units now in production typically have a .6 dB insertion loss, a 26 dB return loss and isolation levels of 105/spl plusmn/5 dB.