Multi-frequency slot antenna apparatus
AssigneeMotorola, Inc.
InventorsHenry H. Nguyen, Michael S. Pieper
Life of this patent
Estimating the term…
Abstract
A multi-frequency antenna apparatus includes an open-ended slot antenna (20) operable at high frequencies, cascaded in series with a antenna element (22) operable at low frequencies, results in two distinct antennas fed by a single excitation port (33). A U-shaped conductive strip (21) defining the slot antenna (20) has a ground connection (37) at one end near the open-ended side of the slot antenna (20) and a virtual feed point (30) on the other end coupled to the antenna element (22). The electrical length from the ground connection (37) to the feed point is about ¼ of a wavelength of the first frequency creating a virtual open at the feed point (30).
Claims20
An antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:
- a dielectric material;
- a slot antenna defined a conductive strip disposed on a top surface of a first portion of the dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency;
- and
- an antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency;
- and
- the conductive strip having a ground connection at one end of the slot antenna and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency.
An antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:
- a dielectric material;
- an open-ended slot antenna defined by a U-shaped conductive strip disposed on a top surface of a first portion of a dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency;
- an antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency, and
- the conductive strip having a ground connection at one end and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency, the ground connection and feed point being located near an open-end of the slot antenna;
- and
- an excitation port electromagnetically coupled to both the slot antenna and the antenna element.
A multi-band radiotelephone including an antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:
- a dielectric material;
- an open-ended slot antenna defined by a U-shaped conductive strip disposed on a top surface of a first portion of a dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency;
- a coil antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency, and
- the conductive strip having a ground connection at one end and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency, the ground connection and feed point being located near an open-end of the slot antenna;
- and
- an excitation port electromagnetically coupled to both the open-ended slot antenna and the coil antenna element.
Dependencies are inferred from the claim text.