Magic-T Applications - E-H Tuner , Microwave Mixer
The combination of E-plane tee and H-plane tee is referred as magic-T or hybrid tee.The magic-T has following features when all the four ports are terminated with matched load.
• Two equal amplitude waves fed at port 1 and port 2, produce zero at port 3(E-arm) and sum of port 1 and port 2 at port 4(H-arm).
• A wave input at port-3 divides equally at port 1 and port-2,but opposite in phase with no coupling at port-4(H-arm)
• A wave input at port-4 divides equally at port-1 and port-2 in phase with no coupling to port-3(E-arm)
• A wave fed into one port-1 or port-2 will not appear in the other port-2 or port-1. Hence these two collinear ports 1 and 2 are isolated to each other.
The magic-T has many applications such as E-H tuner for impedance matching and balanced mixer in microwave receiver to balance out LO noise at the input of IF amplifier. Magic-T is also used in power combiner and duplexer circuit.
In a E-H tuner,both of the E and H arms are terminated by movable shorts which act as stubs. E-arm shorts are referred as E-plane stub and H-arm shorts are referred as H-plane stub. The position of these shorts can be adjusted to match broad range of load impedance to reduce VSWR of the waveguide system.
In a balanced mixer configuration, an incoming signal is fed to E-arm and LO signal is fed to H-arm. These two signals enter the collinear arms and beat with crystal diodes placed here to produce IF signal.
WAVEGUIDE RELATED LINKS
RF Switch basics and applications along with manufacturers of RF switch refer following link:
For types of waveguide viz. rectangular & circular, waveguide propagation modes, impedance matching of waveguide read following waveguide tutorial.
waveguide basics tutorial
Manufacturers of waveguide components such as waveguide to coaxial adapter, coupler, flanges, gasket, tees, termination, shorts, isolator, circulator, horn antenna, attenuator, feed-thrus, bends, loads, twists, straights, pressure windows, transformers, sliding short circuits, fixed short circuits, sliding mismatches etc. visit following link.
Waveguide components manufacturer
Rectangular waveguide dimensions as per USA standard including frequency, broad dimension and narrow dimensions, visit following link.
Waveguide dimensions table
This article describes microstrip line basics and mention types of microstrip lines and their advantages. READ MORE.
What is Difference between
difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
OFDM vs OFDMA
CDMA vs GSM
Bluetooth vs zigbee
Fixed wimax vs mobile