Microwave electric power receiver

• US 5,122,809 A
• Filed: 08/23/1991
• Issued: 06/16/1992
• Est. Priority Date: 04/03/1989
• Status: Expired due to Fees

• Current Assignee: Yokowo Company Limited
• Original Assignee: Yamatake-Honeywell Company Limited, Yokowo Manufacturing Company Limited (Yokowo Company Limited)
• Inventors: Kojima, Hiroaki, Tomiyama, Masao, Haruyama, Shinichi, Kawashima, Yoshikazu
• Primary Examiner(s): GENSLER, PAUL L
• Application Number:
  US07/752,183
• Time in Patent Office: 298 Days
• Field of Search: 333/219, 333/222, 333/246, 333/247, 343/700 MS, 343/793, 343/795, 343/797, 343/807, 343/820, 343/822, 343/701, 455/327, 455/330
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

In a microwave electric power receiver, a microstrip resonator having a line length 1/2 of a wavelength of a microwave to be received is notched to be split at its longitudinally central portion into two portions. A rectification diode is interposed between notched end portions of the microstrip resonator portions to be matched therewith. The diode generates a DC power.

Claims

1. A microwave electric power receiver for generating a DC power from a received microwave comprising:

two microstrip resonators formed on an upper surface of a planar dielectric substrate which includes a ground plate disposed on a lower surface, said microstrip resonators each having a line length 1/2 of a wavelength of the microwave to be received are arranged perpendicular to each other in a cross shape, each of said two microstrip resonators is split at a longitudinally central portion thereof into two portions, two rectification diodes are interposed respectively between the notched end portions of the corresponding microstrip resonators to be matched therewith; and

wherein a choke coil is interposed between a cathode of at least one of the diodes and a positive output terminal and another choke coil is interposed between an anode of at least one of the diodes and a negative output terminal, said choke coils being formed on the dielectric substrate.

2. A microwave electric power receiver accordingly to claim 1, wherein said two diodes are connected in parallel with each other such that a first branch between positive and negative output terminals includes a choke coil, a microstrip resonator portion, a diode, another microstrip resonator portion and another choke coil connected in series, and a second branch connected in parallel with the first branch between positive and negative output terminals includes a choke coil, a microstrip resonator portion, a diode, another microstrip resonator portion and another choke coil connected in series.

3. A microwave electric power receiver according to claim 1, wherein said two diodes are connected in series such that between positive and negative output terminals are connected in series a choke coil, a microstrip resonator portion, a diode, another microstrip resonator portion, another choke coil, another microstrip resonator portion, another diode, another microstrip resonator portion, and another choke coil.

4. A microwave electric power receiver according to claim 1, wherein said notched end portions of said microstrip resonator are tapered toward distal ends thereof to match with said diode.