Amplitude modulator, selector switch, high frequency transmitting/receiving apparatus including the same, and radar apparatus, and radar apparatus-mounting vehicle and radar apparatus-mounting small ship
First Claim
1. An amplitude modulator comprising:
- two high frequency transmission lines for transmitting high frequency signals;
a high frequency modulating element that is provided between the high frequency transmission lines and that modulates a high frequency signal input from one of the high frequency transmission lines and outputs the high frequency signal to the other of the high frequency transmission lines; and
a bias supply circuit that is connected to tie high frequency modulating element and supplies a bias voltage to the high frequency modulating element, wherein the bias supply circuit includes a variable resistor for adjusting a bias current flowing through the high frequency modulating element.
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Accused Products
Abstract
An amplitude modulator in which modulator characteristics can be tuned is provided. In an amplitude modulator, between two high frequency transmission lines for transmitting high frequency signals, is provided a PIN diode which is a high frequency modulating element that modulates a high frequency signal input from one of the high frequency transmission lines and outputs the high frequency signal to an output terminal of the other of the high frequency transmission lines. A bias supply circuit includes a trimmable chip resistor which is a variable resistor for adjusting a bias current flowing through the PIN diode. By adjusting a resistance value, the bias current flowing through the PIN diode is controlled, so that it is possible to tune the modulator characteristics.
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Citations
20 Claims
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1. An amplitude modulator comprising:
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two high frequency transmission lines for transmitting high frequency signals;
a high frequency modulating element that is provided between the high frequency transmission lines and that modulates a high frequency signal input from one of the high frequency transmission lines and outputs the high frequency signal to the other of the high frequency transmission lines; and
a bias supply circuit that is connected to tie high frequency modulating element and supplies a bias voltage to the high frequency modulating element, wherein the bias supply circuit includes a variable resistor for adjusting a bias current flowing through the high frequency modulating element. - View Dependent Claims (2, 3, 4, 7, 8, 11, 12, 15, 16)
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5. A selector switch comprising:
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an input side high frequency transmission line having an input terminal;
two output side high frequency transmission lines each having an output terminal;
PIN diodes, one of which is provided between the input side high frequency transmission line and one of the output side high frequency transmission lines, and another of which is provided between the input side high frequency transmission line and the other of the output side high frequency transmission lines; and
a bias supply circuit provided so as to individually correspond to each of the PIN diodes, for supplying a bias voltage to the PIN diodes, wherein the bias supply circuit includes a variable resistor for adjusting a bias current flowing through the PIN diodes. - View Dependent Claims (6, 9, 10, 13, 14, 17, 18, 19, 20)
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Specification