Portable radio apparatus having a slot antenna

• US 5,946,610 A
• Filed: 10/03/1995
• Issued: 08/31/1999
• Est. Priority Date: 10/04/1994
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Hama, Norio
• Primary Examiner(s): TO, DORIS HA
• Application Number:
  US08/538,788
• Time in Patent Office: 1,428 Days
• Field of Search: 455/89, 455/90, 455/95, 455/128, 455/129, 455/269, 455/344, 455/347, 455/349, 455/351, 455/296, 455/303, 455/324, 455/313, 455/271, 455/278.1, 455/127, 455/343, 455/575 , 455/571, 455/550, 455/38.1-38.4, 343/702, 343/718, 343/767, 343/770, 343/746, 343/769, 340/825.44
• US Class Current: 455/351
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 13/10 Resonant slot antennas

Abstract

The invention provides a small portable radio apparatus including a slot antenna member. The slot antenna member has an improved form disposed in a casing. The casing has a curvedly bulging side edge surface. Thus, there is no useless space in the casing reducing the size of the portable radio apparatus. The slot antenna member has first and second conductive plates which form a slot groove at an outer peripheral edge of the first and second conductive plates. A short-circuiting element short-circuits the conductive plates with each other over the slot groove. A tuning capacitor element is connected to the first and second conductive plates at a position opposite to a position where the short-circuiting element is provided. The radio apparatus casing has a side portion which curvedly bulges toward an outer periphery thereof. The first and second conductive plates have central portions with openings and side portions which bulge slantingly toward outer peripheral edges thereof.

Claims

1. A portable radio apparatus, comprising:

a casing;

a circuit board within the casing, the circuit board comprising a radio apparatus circuit that includes a direct conversion circuit and a local oscillating circuit, the radio apparatus circuit being located on a first side of the circuit board closest to the short-circuit elements;

a booster circuit, wherein the direct conversion circuit is driven by the boozers circuit, the booster circuit boosting an electric cell voltage, an operating frequency of the booster circuit being in a non-pass band of a base-band-signal-filtering circuit of the radio apparatus circuit; and

a slot antenna within the casing, the slot antenna being formed by a first conductive plate and a second conductive plate, the circuit board being disposed between the first and second conductive plates, the first and second conductive plates having central portions and perimeter portions, the central portions being separated by a first distance, the perimeter portions having peripheral edges, the peripheral edges being separated by a second distance which is less than the first distance, portions of the first and the second conductive plates between the central portions and the peripheral edges having a third distance, the third distance decreasing from the central portions toward the peripheral edges, the peripheral edges forming a slot of the slot antenna, and the slot being bridged by a short-circuit element across the peripheral edges.

2. The portable radio apparatus of claim 1, further comprising a crystal oscillator, wherein the operating frequency of the booster circuit is determined by the crystal oscillator.

3. A portable radio apparatus comprising:

a casing;

a circuit board within the casing, the circuit board comprising a radio apparatus circuit;

a slot antenna within the casing, the slot antenna being formed by a first conductive plate and a second conductive plate, the circuit board being disposed between the first and second conductive plates, the first and second conductive plates having central portions and perimeter portions, the central portions being separated by a first distance, the perimeter portions having peripheral edges, the peripheral edges being separated by a second distance which is less than the first distance, portions of the first and the second conductive plates between the central portions and the peripheral edges having a third distance, the third distance decreasing from the central portions toward the peripheral edges, the peripheral edges forming a slot of the slot antenna, and the slot being bridged by a short-circuit element across the peripheral edges;

a local oscillator circuit;

a direct conversion circuit;

a high-frequency-amplifying circuit, wherein the radio apparatus circuit includes the direct conversion circuit, and the high-frequency-amplifying circuit of the radio apparatus circuit is electrically connected to one of the first and second conductive plates and located on a side of the circuit board opposite an other side of the circuit board which has the local oscillator circuit; and

a booster circuit, wherein the direct conversion circuit is driven by the booster circuit, the booster circuit boosting an electric cell voltage, an operating frequency of the booster circuit being in a non-pass band of a base-band-signal-filtering circuit of the radio apparatus circuit.

4. The portable radio apparatus of claim 3, further comprising a crystal oscillator, wherein the operating frequency of the booster circuit is determined by the crystal oscillator.

5. A portable radio apparatus, comprising:

a casing;

a circuit board within the casing, the circuit board comprising a radio apparatus circuit that includes a direct conversion circuit and a local oscillating circuit, the radio apparatus circuit being located on a first side of the circuit board closest to the short circuit element;

a booster circuit, wherein the direct conversion circuit is driven by the booster circuit, the booster circuit boosting an electric cell voltage, an operating frequency of the booster circuit being in a non-pass band of a base-band-signal-filtering circuit of the radio apparatus circuit; and

a slot antenna within the casing, the slot antenna formed by a first conductive plate and a second conductive plate, the circuit board being disposed between the first and second conductive plates, the first and second conductive plates and the casing having a substantially semi-spherical surface, peripheral edges of the first and second conductive plates forming a slot of the slot antenna, and the slot being bridged by a short-circuit element across the peripheral edges.

6. The portable radio apparatus of claim 5, further comprising a crystal oscillator, wherein the operating frequency of the booster circuit is determined by the crystal oscillator.

7. A portable radio apparatus, comprising:

a casing;

a circuit board within the casing, the circuit board comprising a radio apparatus circuit;

a slot antenna within the casing, the slot antenna formed by a first conductive plate and a second conductive plate, the circuit board being disposed between the first and second conductive plates, the first and second conductive plates and the casing having a substantially semi-spherical surface, peripheral edges of the first and second conductive plates forming a slot of the slot antenna, and the slot being bridged by a short-circuit element across the peripheral edges;

a direct conversion circuit;

a high-frequency amplifying circuit, wherein the radio apparatus circuit is the direct conversion circuit and the high-frequency amplifying circuit of the radio apparatus circuit is electrically connected to one of the first and second conductive plates and located on a side of the circuit board opposite another side of the circuit board which has a local oscillator circuit; and

a booster circuit, wherein the direct conversion circuit is driven by the booster circuit, the booster circuit boosting an electric cell voltage, an operating frequency of the booster circuit being in a non-pass band of a base-band-signal-filtering circuit of the radio apparatus circuit.

8. The portable radio apparatus of claim 7, further comprising a crystal oscillator, wherein the operating frequency of the booster circuit is determined by the crystal oscillator.