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Passive microwave devices
Published in J. Dunlop, D. G. Smith, Telecommunications Engineering, 2017
The third tee is a four-port, known as a hybrid, since it combines an E and an H plane junction. It has the property that a wave entering one port divides into the two adjacent ports, but does not appear at the opposite port. This characteristic allows the junction to be used in any systems in which two signals are to be processed, but must be isolated. For example, as we see in Fig. 9.19(d), this device (sometimes called a magic-tee) can be used to isolate the receiver from the transmitter, in a radar system that has a common transmit–receive aerial. The hybrid-tee has the disadvantage that half of the power is lost – in this example half of the received power goes to the receiver, but the other half is lost in the transmitter, and in a radar system that would degrade the sensitivity of the system considerably.
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Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
magic tee a combination of E-plane (series) and H-plane (shunt) tees forming a hybrid waveguide junction. Typically used to split or couple two microwave signals that are in or out of phase in the same wave guide. Also called a hybrid tee. magic tee junction a four-port microwave device, that couples the input signal at port 1 equally into ports 2 and 3, but not into port 4. Input signal at port 3 is coupled equally into ports 1 and 4, but
A tracking microwave wideband band reject filter using antiphase locking
Published in International Journal of Electronics Letters, 2018
Santosh Kumar Dawn, Taraprasad Chattopadhyay
where and are locked Gunn oscillator voltage amplitudes while and are output phases of the oscillators 2 and 3, respectively. The output of Gunn oscillator 2 undergoes half power-division at the magic tee junction and half of its power travels up the arm-4 of the magic tee getting reflected from the metallic termination of the sliding short. The reflected signal appears at the magic tee junction and undergoes half-power division. The half-power divided waves get injected into Gunn oscillators 2 and 3. From the knowledge of the scattering matrix of the microwave magic tee, the half-power divided wave travelling down arm-3 of the magic tee suffers a phase change of radian at the magic tee junction. The effective injection signal for slave Gunn oscillator 3 is given by