| 单词 | pi-network |
| 释义 | > as lemmaspi-network 4. A four-terminal set of three circuit elements in which one element is in series between two in parallel (so diagrammatically resembling the letter Π in shape). Frequently attributive as pi-network, etc. Usually written π or Π. ΚΠ 1924 K. S. Johnson Transmission Circuits Teleph. Communication xi. 124 If the structure shown in Fig. 1 is considered to be made up of Π sections.., each section may be regarded as terminating in a mid-shunt iterative impedance. 1930 C. Dannatt & J. W. Dalgleish Electr. Power Transmission v. 118 This network is frequently used as an equivalent circuit for a transmission line, and is referred to as a π-circuit. 1950 W. C. Johnson Transmission Lines & Networks xiv. 303 The filters most generally used are made up of T or π sections and L ‘half sections’ connected on an image basis to form a ladder network... A lattice can be designed to provide characteristics unobtainable with the T or π. 1961 Amateur Radio Handbk. (ed. 3) vi. 175/1 The pi-network coupler is often used for delivering power to an aerial feeder. 1972 R. H. Warring Ham Radio v. 68 The adoption of a pi-network tank circuit does not automatically ensure that no harmonics are radiated which may show up..on near-by television receivers, when a transmitter is being worked on the various amateur bands. 2001 L-Match Design - New Program in nl.radio.amateur (Usenet newsgroup) 3 Oct. At the lower radio frequencies inconveniently large values of capacitance are sometimes needed. (T and Pi networks are popular because they can be designed to avoid these two disadvantages.) < as lemmas |
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