H-plane hermetic sealed waveguide probe

Details H-plane hermetic sealed waveguide probe H-plane hermetic sealed waveguide probe

1998-11-19

2001-03-13

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S033000, C333S248000

Reexamination Certificate

active

06201453

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a waveguide probe and more particularly, to an H-plane hermetically sealed waveguide probe.
2. Description of the Prior Art
Waveguides are known in the art for conducting relatively high frequency microwave signals, typically having wavelengths less than 10 cm. Such waveguides are generally formed as rectangular hollow structures with conducting walls which support transverse electric and magnetic (TEM) waves. In order to connect microwave signals from such waveguides to a microwave circuit, waveguide to microstrip adapters, known as microstrip probes, are known. Such microstrip probes generally include a conductor formed on one side of a dielectric substrate with a ground plane formed on the opposing side of the substrate. In order to couple the microwave energy from the waveguide to the microstrip probe, the microstrip conductor is extended into the center portion of the waveguide and aligned with the E-field, defining an E-field probe.
Such probes are used with microwave circuits formed in modular packages defining microwave modules. However, the physical and isolation constraints of the module may not be amendable to the use of an E-field probe. More particularly, such modules require good isolation between adjacent signal ports. The isolation between ports prevents undesired frequency products from leaking into adjacent ports. Normally relatively large physical distances are used to separate the ports such that any signal leaking from a port will be significantly attenuated before it reaches an adjacent port. However, large physical separation between ports is not always possible, for example, in space applications where such modules are relatively compact. In such applications the physical lay out of the module may prevent coupling of the microwave energy in the same direction of the E-field from the input waveguide. Thus, there is a need for a waveguide probe which allows coupling of the microwave signal in the direction of the H-plane.
SUMMARY OF THE INVENTION
The present invention relates to an H-plane waveguide probe. The H-plane waveguide probe includes a microstrip formed on a dielectric substrate with a loop conductor generally configured in the shape of the waveguide on one side and adapted to capture an incoming H-waveguide signal. A transition conductor with a first leg and a second leg, connected together by a bend portion formed in a generally L-shape is formed on an opposing side of the substrate. The first leg of the transition conductor is generally parallel to the E-field for coupling microwave energy from the waveguide to the microstrip. The second leg of the transition conductor is parallel to the H-field and is used to change the direction of the captured microwave energy along the E-plane direction to the H-plane direction. In order to optimize power transfer, the impedance of the loop conductor is selected to be about the same as the waveguide. The transition conductor is used to convert the E-field energy to a 50&OHgr; impedance, for example, for connection to an external microwave circuit.


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